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Y2O3:Eu3+,Tb3+,Ce3+ phosphors were prepared by the co-precipitation method and the optimal component formulations of the samples were determined by a combination of controlled variable method and orthogonal experiments. The experimental results show that doping with appropriate amounts of Tb3+ and Ce3+ significantly improved the luminescence performance of Y2O3:Eu3+ phosphors. In the Y2O3:Eu3+,Tb3+,Ce3+ phosphors system, Tb3+ could be used as a carrier to transfer energy for Ce3+–Eu3+, eliminating the presence of metal–metal charge transfer (MMCT) between the two ions. The direction of energy transfer which is from Ce3+ → Tb3+ → Eu3+ has been confirmed by emission spectrum and calculation results show that the mechanism of Tb3+ to Eu3+ energy transfer and Ce3+ to Tb3+ energy transfer in Y2O3 matrix are both quaternary–quaternary interactions. As the doping concentration of Tb3+ and Ce3+ increases, the emission peak position of phosphor was shifted toward the blue region. Their structure and micromorphology have been analyzed by X-ray diffraction and scanning electron microscopy, the test results show that ion doping does not cause changes in the crystal structure of Y2O3 and the samples are approximately spherical in shape. This work provides a new idea to study the UV detection and multi-ion inter-energy transfer model. [ABSTRACT FROM AUTHOR]

In this study, up-conversion fluoride phosphors NaY1−x-y−m−nMxF4:Er3+y,Ho3+m,Yb3+n (M = Lu3+/Gd3+) were synthesized by a low-temperature combustion method. The optimal ionic ratios in the matrix lattice were also determined by a controlled variable method. It was confirmed that doping a small amount of Ho3+ ions and Yb3+ ions in the Er-doped sample matrix lattice can form a mutual sensitizer and a transient energy capture center to enhance the sample's up-conversion luminescence under excitation at the 1550 nm band, respectively. It was also found that the lanthanide ion introduced can modulate the red-to-green ratio of the up-conversion luminescence of the sample. The phase composition and morphology of phosphors were investigated using X-ray diffraction and scanning electron microscopy. The up-conversion luminescence mechanism of Er–Ho–Yb tri-doped samples excited at the 1550 nm band was also investigated. This work presents a novel approach for improving up-conversion luminescence with high color-purity phosphors for display lighting applications when excited at 1550 nm. [ABSTRACT FROM AUTHOR]

A series of Ca3−xMx(PO4)2:Eu2+ (M = Sr, Ba) phosphors were prepared via a high-temperature solid-state reaction process. The X-ray diffraction and Rietveld refinements were used to verify the incorporations of Eu2+ into Ca3−xMx(PO4)2:Eu2+ (M = Sr, Ba). Upon excitation at 365 nm, the Ca3(PO4)2:Eu2+ phosphors exhibit a relatively narrow-band blue emission peaking at 415 nm attributed to the electric radiation transitions 4f65d1 → 4f7 of Eu2+. Moreover, the structural phase transformation and the unusual emission color variation of Ca3−xMx(PO4)2:Eu2+ (M = Sr, Ba) phosphors via the replacement of cationic M2+ (Sr2+, Ba2+) were reported. Upon excitation at the same wavelength of 365 nm, the emission peaks of Eu2+-doped Ca3−xSrx(PO4)2 phosphors red-shifted from 411 to 524 nm with increasing Sr/Ca ratio. The emission thermal stability of M3(PO4)2:Eu2+ (M = Ca, Sr, Ba) was comparatively characterized and the difference was related to the specific host structural features. The combination of host composition design may provide a novel strategy to obtain white light and tunable luminescence. [ABSTRACT FROM AUTHOR]

Aluminosilicate phosphors have been successfully applied in laser technology and fluorescent lamps due to their high luminescence properties and excellent chemical stability. Consequently, research on novel aluminosilicate phosphors has a good application prospect. Rare earth (RE) ions doped SrAl2Si2O8 phosphors were prepared by solid-phase method. Excited at 350 nm, the phosphor doped with Dy3+ ions emits a blue light peaking at 482 nm and an orange light peaking at 575 nm, respectively, and its optimum doping concentration is 0.8 at.%. At the NUV excitation of 377 nm, the phosphor doped with Tb3+ ions shows emission peaks at 489 nm, 544 nm, 585 nm and 623 nm, and the luminescence intensity is the strongest when the content of Tb3+ is 9 at.%. The concentration quenching mechanism of Dy3+ and Tb3+ RE ions is the electric dipole–dipole interaction. For SrAl2Si2O8:Tb3+, Sm3+ phosphors, the energy transfer efficiency is 85.4%, and the mechanism is electric dipole–quadrupole interaction. For SrAl2Si2O8:Dy3+ and SrAl2Si2O8:Tb3+, Sm3+ phosphors, the best CIE coordinates are (0.275, 0.308), (0.316, 0.386). The consequences display that RE ions doped single matrix SrAl2Si2O8 phosphors can achieve effective white light emission and have high application value in white LEDs. [ABSTRACT FROM AUTHOR]

Abstract Ca 2 NaMg 2 V 3 O 12 (CNMV):Ln3+ (Dy3+, Sm3+) phosphors were successfully prepared by high temperature solid-state method. The effect of different Ln3+ concentrations on the luminescent properties of phosphor was investigated. General structure analysis system (GSAS) shown Ln3+ ions occupied Ca2+/Na+ sites. CNMV:Ln3+ (Dy3+, Sm3+) had broad excitation bands at 200–450 nm and broad emission bands at 400–700 nm. Under 365 nm excitation, CNMV:Dy3+ samples show two dominant emission peaks at around 480 nm and 575 nm, which is corresponding to 4F 9/2 -6H 15/2 and 4F 9/2 -6H 13/2 transitions of Dy3+, CNMV: Sm3+ samples show three emission peaks, which is corresponding to the 4G 5/2 -6H J/2 (J = 5,7,9) transitions of Sm3+. The energy transfer (ET) mechanism could be judged as an electric multipole interaction with their quenching concentration and critical distance. ET efficiency (ETE), lifetime, quantum efficiency (QE), color coordinates and good thermal stability were reported. Emitting-color tended to near white light when adjusting Ln3+ concentration. Highlights • The emitting-color of CNMV:Ln3+ was tunable by adjusting Ln3+ content. • There is energy transfer of VO 4 3−→Ln3+. • CNMV:Ln3+ phosphors show good thermal stability. [ABSTRACT FROM AUTHOR]

YVO4:Bi3+,Ln3+ (Ln = Dy, Sm, Eu) phosphors were successful synthesized by microwave sintering method, and characterized by X-ray powder diffraction, scanning electron microscope, photoluminescence spectra, lifetime, quantum efficiency and general structure analysis system structure refinement. Refinement results indicated that the introduced ions occupy the sites of Y3+. Under 275 nm excitation, the luminescent intensity of YVO4:Bi3+ samples reach the maximum when Bi3+ concentration is 0.02, the broad excitation spectrum of YVO4:Bi3+ has a strongest peak at near 343 nm. Doped Bi3+ can effectively improve the emission intensity of YVO4:Ln3+. The energy transfer mechanism of Bi3+ → Ln3+ was dipole-quadrupole mechanism of electric multipole interaction. The critical distance (Rc) between Ln3+ and Bi3+ were calculated by concentration quenching method. Emitting color of YVO4:Bi3+,Ln3+ phosphors were tunable by adjusting Ln3+ content. In a word, the material has a good application prospects on light emitting diodes. [ABSTRACT FROM AUTHOR]

Well-crystallized NaREF4: Yb3+, Er3+ (RE = Y, Lu, La, Gd) phosphors were synthesized by a solid-state reaction method. X-ray diffraction characterization showed that the synthesized samples were all pure hexagonal phase after a calcination process on the as-prepared precursors at 550 °C for 2 h by using Na2CO3 as a fluxing agent. Upconversion spectral analysis showed that under a 1550 nm laser diode excitation, the samples emitted dominant green emission centered at 540 nm and red emission centered at 654 nm, which corresponded to the 2H11/2/4S3/2→4I15/2 and 4F9/2→4I15/2 transition of Er3+ ions, respectively. Color-tunable upconversion luminescence was realized by the variation of Yb3+/Er3+ doping concentration and the types of the host materials, indicating the synthesized hexagonal Yb3+ and Er3+ co-doped NaREF4 phosphors potential applications in many fields, especially in biological imaging and detection. [ABSTRACT FROM AUTHOR]

$${{\text{Y}}_{{\text{2}}.{\text{9}} - {\text{x}}}}{\text{A}}{{\text{l}}_{{\text{4}}.{\text{25}}}}{\text{G}}{{\text{a}}_{0.{\text{75}}}}{{\text{O}}_{{\text{12}}}}:{\text{Ce}}_{{0.{\text{1}}}}^{{{\text{3}}+}},{\text{S}}{{\text{m}}_{\text{x}}}$$ (YAGG) (x = 0, 0.02, 0.04, 006, 0.08, 0.10) phosphors were prepared by high temperature solid state reaction method. X-ray diffraction and fluorescence spectrum techniques were used to analyze the samples. The luminescence and energy transfer properties of samples were discussed in detail. The results indicated that a new emission peak located at 617 nm corresponding to the G → H transition of Sm ion were observed after co-doping of Sm ions. Energy transfer from Ce to Sm ions was demonstrated in YAGG host based on the emission spectra which lead to the decreases of emission intensity of Ce ions with the increase of Sm concentration. The energy transfer efficiency between Ce and Sm ions as high as 69.3% was calculated. The energy transfer type from Ce to Sm ions was supposed to be a resonant type through dipole-dipole. [ABSTRACT FROM AUTHOR]

Novel broadband luminescence phosphors CaNaMgVO:xEu have been successfully prepared via the conventional high-temperature solid-state reaction. The effects of concentrations of doped Eu and introducing Li, K on the luminescent properties of phosphor were studied. X-ray diffraction, GSAS structural refinement and photoluminescence spectra were used to characterize the samples. The refinement data ensured where the doped Eu ions occupied the lattice site in the host. Under 355 nm excitation, the emission peak of CaNaMgVO:Eu phosphors are located at 610 nm (red) ascribed to the electric dipole transition of Eu from D → F. In the range of 400-575 nm, CaNaMgVO:Eu phosphors have broad emission bands attributed to charge transfer of $${\text{VO}}_4^{3 - }$$ group. Energy transfer mechanism, energy transfer efficiency and critical distance (R) of $${\text{VO}}_4^{3 - }$$ → Eu would be analyzed. The emitting color of CaNaMgVO:Eu could be tunable from blue-green to near white light. [ABSTRACT FROM AUTHOR]

Abstract: Cr3+:Al2O3 nano-powders were prepared through low-temperature combustion synthesis (LCS) method by using glucose as a dispersion agent for the first time. The Cr3+:Al2O3 nano-powders samples were characterized by X-ray diffraction (XRD), transmission electron microscopy (TEM) and luminescence spectrometer. XRD results showed that pure α-Al2O3 phase was obtained for the sample fired at 1100°C for 0.5h. TEM results indicated that nano-powders were well dispersed. Luminescence spectrum analysis results indicated that the excitation spectrum of Cr3+:Al2O3 nano-powders consisted of two bands peaking at 462nm and 579nm, respectively, and the emission spectrum consisted of two bands peaking at 692nm and 668nm, respectively. [Copyright &y& Elsevier]

• Lu3+ ion substitution approach not only enhances the upconversion luminescence of NaBiF 4 : Tm3+/ Yb3+, but also improves its temperature detection performance. • Lu3+ ion substitution increases the particle size of the samples and results in the lattice contraction, which is responsible for the luminescence enhancement. • Anomalous thermal enhanced luminescence is observed in the phosphor. • The maximum relative sensitivity is up to1.25 % K−1 at 296 K. NaBiF 4 : Tm3+/ Yb3+/ Lu3+ as a ratio thermometer were successfully prepared by rapid co-precipitation method at room temperature. Under the excitation of 980 nm, four characteristic emission peaks were obtained in the visible and near-infrared ranges, belonging to the 1G 4 →3H 6 (475 nm), 1G 4 →3F 4 (650 nm), 3F 2,3 →3H 6 (696 nm) and 3H 4 →3H 6 (800 nm) transitions of Tm3+. The introduction of Lu3+ increases the size of the sample and shrinks the lattice, which results in an enhancement of its upconversion luminescence. Based on the fluorescence intensity ratio technique, the non-thermally coupled levels of Tm3+ (1G 4 →3F 4 , 3F 2,3 →3H 6) were selected to study the temperature sensing performance. The sample shows good temperature sensitivity in the range of 296 - 496 K, with a maximum relative sensitivity of 1.25 % K −1 at 296 K. The results show that NaBiF 4 : Tm3+/ Yb3+/ Lu3+ luminous materials can be candidate materials for temperature sensing. Upconversion luminescence and temperature detection of NaBiF 4 : Tm3+/ Yb3+ are improved by introducing Lu3+ with a maximum relative sensitivity of 1.25 % K−1 at 296 K. [Display omitted] [ABSTRACT FROM AUTHOR]

A series of Na 2 MMg(PO 4) 2 :Eu2+ (M = Ca/Sr/Ba) phosphors were synthesized by the high-temperature solid-state reaction. X-ray diffraction (XRD), photoluminescence (PL) and GSAS structural refinement were used to characterize the samples. Rietveld refinements of powder X-ray diffraction patterns of Na 2 MMg(PO 4) 2 confirm that the structure of Na 2 MMg(PO 4) 2 consist of stacking along the [001] direction. The M2+ cations are located within the interlayer space, while Na+ is found in a mount of cavities bounded to the layers. Upon excitation at 350 nm, the phosphors exhibit the asymmetric broadband emission peaked at about 392 nm attributed to the 4f65d1→4f7 transitions of Eu2+. It is found that the energy transfer occurred mainly by the electric dipole-dipole interaction according to the Eu2+ concentration quenching mechanism. Moreover, when Ca2+ sites are substituted by Sr2+ or Ba2+, the Eu2+ emission band shifts to a longer wavelength initially and then returns to a shorter wavelength. In particular, 89.5% of the room-temperature emission intensity is still maintained at 500 K, indicating a good thermal stability. The obtained results suggest that the phosphor could be a potential candidate for applications in white light-emitting diodes. Image 1 • Determine the structure of the prepared phosphors by the Rietveld refinement. • Effect of alkali metal ions on the luminescence properties of phosphors. • Explain the shift of emission by local lattice variation from the neighboring. • The WLED lamp produced a white light possessing a high color rendering index. [ABSTRACT FROM AUTHOR]

The lack of red light emission in Y 3 Al 5 O 12 :Ce3+ (YAG:Ce3+) luminescent ceramics has resulted in high color temperature and low color rendering index for solid state illumination, such as, LED or LD. Therefore, Y 2.94 Al 5-x Cr x O 12 :0.06Ce3+ (x = 0.004, 0.029, 0.054, 0.079, 0.104 mol) luminescent ceramics were prepared by vacuum sintering method. The doping of Cr3+ ions caused the weak red emission peaks between 675 nm and 720 nm, and the luminescence intensity of red light increased first and then decreased with the increase of Cr3+ ions doping content. The best doping concentration of Cr3+ ions is 0.054 mol. And in the co-doped system of ceramics, we confirmed the energy transfer from Ce3+ to Cr3+. YAG:Ce3+, Cr3+ series ceramics yielded a slight shift in color coordinates towards the red light area. Meanwhile, as the concentration of Cr3+ ions increasing, the color rendering index began to show an increasing trend with a maximum value of 79.4. The consequences display that Ce, Cr co-doped garnet luminescent ceramics are promising for red light supplementation and high CRI lighting applications of white LD. [ABSTRACT FROM AUTHOR]

Rare earth doped fluoride-based up-conversion luminescent materials have been widely studied in non-contact temperature sensing technology. However, the luminous intensity of the fluoride at high temperature still needs to be improved. Here, enhanced up-conversion luminescence and temperature sensing performance of NaBiF 4 : Er3+, Yb3+ is realized by Al3+ substitution. The samples exhibit the characteristic green (521 nm and 540 nm) and red (654 nm) emissions of Er3+ ion under 980 nm excitation. When the concentration of Al3+ is 5%, the green emission is enhanced by about 10 times, and the red light is enhanced by about 7 times. Obvious lattice shrinkage caused by the introduction of Al3+ is responsible for the enhancement. In addition, the optimal sample is highly thermally stable from 303 K to 443 K. The maximum relative sensitivity at 303 K increases from 0.791% K−1 to 1.106% K−1. The results indicate that NaBiF 4 : Er3+, Yb3+, Al3+ be a potential thermosensitive material. • Enhanced up-conversion luminescence and temperature sensing of NaBiF 4 : Er3+, Yb3+ is realized by Al3+ substitution. • Obvious lattice shrinkage caused by the introduction of Al3+ is responsible for the enhancement. • The optimized sample is highly thermally stable from 303 K to 443 K. • The maximum relative sensitivity is up to 1.106% K−1 at 303 K. [ABSTRACT FROM AUTHOR]

LiAl 4 O 6 F (LAOF): Mn4+, Na+, Ga3+ red fluorescent materials were prepared by high temperature solid phase method. The properties of LAOF: Mn4+, Na+, Ga3+ phosphors were characterized by X-ray diffraction (XRD), photoluminescence (PL) spectra, variable temperature spectroscopy, scanning electron microscopy (SEM) and other tests. Under the excitation of 450 nm light, an intense red emission peak was observed around 662 nm, corresponding to the 2E g →4A 2g transition of Mn4+. Compared with Mn4+ single doping, the introduction of Na+, Ga3+ greatly improves the luminescence intensity of LAOF. The photoluminescence quantum yield of the optimal LAOF: 0.2%Mn4+, 0.2%Na+, 3%Ga3+ phosphor was measured to be 41.6%. The prepared sample have excellent thermal and water stability. Meanwhile, the w-LED device with a beneficial luminescence efficiency (LE = 331.7 lm W−1), exhibited good CRI and CCT values. These results indicate that LAOF: Mn4+, Na+, Ga3+ phosphors have potential application prospects as a red component in the field of lighting display. • Under the same excitation, the luminous intensity of LiAl 4 O 6 F: Mn4+, Na+, Ga3+ is 150% of LiAl 4 O 6 F: Mn4+. • The luminescence intensity of LiAl 4 O 6 F: 0.2%Mn4+, 0.2%Na+, 3%Ga3+ phosphor was maintained at 72% of the room temperature at 150 °C. • The luminescence intensity of LAOF: 0.2%Mn4+, 0.2%Na+, 3%Ga3+ phosphor was 60.92% of the initial one after 5 h of immersion. • LAOF: 0.2%Mn4+, 0.2%Na+, 3%Ga3+ phosphor was packaged into device can achieve a high luminous efficiency of 331.7 lm W−1. [ABSTRACT FROM AUTHOR]

The white-emitting Ca 3 (PO 4) 2 : Dy3+ phosphors were prepared via hydrothermal synthesis. The phosphors were characterized by XRD, TEM, SEM, EDS, GSAS structural refinement and PL spectroscopy, respectively. Rietveld refinement demonstrated that the Ca 3 (PO 4) 2 crystal structure consisted of [PO 4 tetrahedrons filled with Ca atoms. Dy3+ ions occupied high-symmetry sites due to the emission intensity of 4F 9/2 → 6H 15/2 was strongest. Moreover, the pH value and calcination temperature had important effects on the phosphor morphology and luminescent properties. The morphology of the samples changed from long-rod to short-rod and sphere and the size reduced as the pH value in the initial reaction solution increased. The samples with pH of 7 had the best luminescence properties, and the precursor before calcination corresponded to Ca 4 P 2 O 9. With the calcination temperature of the precursor with pH of 7 increased, the phosphor morphology changed from nanorods to grains with diameters of about 1 μm, and the luminescence properties were improved continuously. The CIE coordinate of Ca 3 (PO 4) 2 : Dy3+ phosphor was (0.283, 0.343). The Ca 3 (PO 4) 2 : Dy3+ phosphor has better application prospects for white light-emitting diodes. • The white-emitting Ca 3 (PO 4) 2 : Dy3+ phosphors were synthesized via the hydrothermal synthesis. • The precursor at pH of 7 matches well with Ca 4 P 2 O 9. • The changes of phase structure, morphology, luminescent properties of the phosphor by controlling pH value and calcination temperature was systematically studied. • As the pH value in the initial reaction solution increased, the morphology of the samples changed from long-rod to short-rod and sphere and the size reduced. [ABSTRACT FROM AUTHOR]

Ce3+-doped Lu 3 Mg 2 GaSi 2 O 12 (LMGS) yellow-green phosphors were synthesized by a high-temperature solid-state reaction method for 3 h. The optical properties and crystal structure of the obtained samples were characterized by spectral analysis and Rietveld refinement, respectively. The emission spectra excited by 460 nm exhibit broad yellow-green emission bands from 525 to 535 nm (having short redshift with increasing Ce3+ concentration). At 423 K, the emission intensity of the LMGS: 0.0015Ce3+ phosphor decreases to 81.94% of that at room temperature, and the activation energy is approximately 0.153 eV. The samples presented good water resistance. Finally, we packaged the obtained green phosphors and commercial red phosphors Sr 2 Si 5 N 8 : Eu2+ with a blue LED chip. The color-rendering index and correlated color temperature of the packaged w-LED under 460 nm excitation were 84.2 and 4034, respectively. All the above results indicate that the LMGS: Ce3+ samples have great potential for applications in w-LEDs. [ABSTRACT FROM AUTHOR]

Originating from the precise control of the luminous color, the development of phosphors with color tunable and single-component white-emitting luminescence properties has always been the focus of high-quality white LED research. Herein, we report that a promising candidate of Ca 2 YZr 2 Al 3 O 12 : Ce3+, Tb3+ (CYZA: Ce3+, Tb3+) phosphors can be excited by near ultraviolet light (n-UV) to meet the above requirements. The Ce3+ and Tb3+ co-doped garnet-type Ca 2 YZr 2 Al 3 O 12 with blue, cyan and green-emitting were synthesized by the conventional high temperature solid-state reaction in air atmosphere. The X-ray diffraction, photoluminescence at room temperature and variable temperature, fluorescent lifetime measurements were characterized to analyze the crystal structure, luminous performance, energy transfer mechanism and thermal stability behavior in detail. As-prepared samples displayed tunable photoluminescence based on the energy transfer from Ce3+ to Tb3+ upon n-UV excitation. More importantly, CYZA: Ce3+, Tb3+ doped with a certain amount of Eu3+ remain single-phase and possess high color rendering index up to 90. The as-fabricated WLED device shows a white light-emitting with the chromaticity point of (0.3578,0.3790) at CCT of 4673 K, which can be further improved via optimizing the ratio of sensitized and activated ions. These results suggest that it possess a great potential as high-quality luminescent materials for the design of white LEDs with excellent performance. • CYZA: Ce3+, Tb3+ phosphors were prepared for the first time by solid-state reaction route. • The emitting-color of CYZA: Ce3+, Tb3+ can be tuned by adjusting ratio of Ce3+/Tb3+. • The mechanism of Ce3+.→Tb3+ energy transfer and thermal quenching behavior was investigated. • As-fabricated w-LED device without employing other phosphor exhibits high color rendering index and white-emitting light. [ABSTRACT FROM AUTHOR]

Aluminosilicate phosphors have been widely used in the fields of fluorescence and laser technology due to its excellent optical properties. However, red phosphors have low luminescence efficiency, and poor physicochemical stability, which cannot achieve efficient white light emission. Therefore, improving the luminescence performance of aluminosilicate red phosphors is a research hotspot in white LED. In this work, SrAl 2 Si 2 O 8 : Eu3+ red phosphor was synthesized by high temperature solid-phase method. By introducing charge compensator and flux, the luminescence intensity of the phosphor is increased. The best charge compensator is determined as Li+ with the same Eu3+ doping content. The best flux is H 3 BO 3 , and the optimal doping concentration of flux is 3 wt%. For SrAl 2 Si 2 O 8 : Eu3+, Li+, H 3 BO 3 red phosphor, the CIE coordinates are (0.619, 0.380) and CCT is 3417 K, which is very close to the standard red light. Through LED packaging mixing phosphor with YAG: Ce3+, the method can significantly improve the color rendering index of WLED, up to 84.7. When the temperature reaches 150 °C, the luminescence intensity decreases to 88.02% of the initial value, which indicates that the SrAl 2 Si 2 O 8 phosphor is an excellent stable red luminescent material. [ABSTRACT FROM AUTHOR]

A series of Y 2.94-x Lu x Al 4 GaO 12 : 0.06Ce3+ phosphors were prepared by the conventional solid-state reaction method. It was confirmed that the phosphors exhibit cubic garnet crystal structures by XRD and Rietveld refinements. The phosphors show an intense broad emission band from 475 nm to 650 nm, which attributed to the 5d→4f transitions of the Ce3+ ions under the excitation of 450 nm. Simultaneously, obvious blue shift is observed from 518 nm to 497 nm with increasing Lu3+ concentrations from 0 to 2.94. With the increase of Lu3+ concentrations the emission intensity increases and reaches to the maximum for x = 2.5. By optimizing Lu3+ concentration, the quantum efficiency up to 89.8% is obtained. The emission intensity at 453 K is up to 92% of that at room-temperature indicating a weak thermal quenching and a superior thermal stability. These results indicate that the phosphor can be used in blue LED-Chip based white LEDs in the future. [ABSTRACT FROM AUTHOR]

• Ca 9 Y(PO 4) 7 :Eu2+, Mn2+ phosphors synthesized by hydrothermal was the first time. • The size of nanophosphor was approximately 100 nm with good dispersibility. • The samples change from rod to ball shapes, aspect ratio reduce by increasing pH. A series of emission-tunable Ca 9 Y(PO 4) 7 :Eu2+, Mn2+ nanophosphors were synthesized by the hydrothermal method. X-ray diffraction (XRD), photoluminescence (PL), Rietveld refinement and transmission electron microscopy (TEM) were used to characterize the samples. The results showed that the pH value played a key role in determining the morphology of nanophosphors. With the increase of pH values in the initial solution, the morphologies of samples changed from rod-shapes to ball-shapes. And the decrease of aspect ratios accompanies a change in luminescence properties. The energy transfer from Eu2+ to Mn2+ in Ca 9 Y(PO 4) 7 was achieved due to the electric multipolar interaction of the electric dipole-quadrupole mechanism, and the critical distance (R c) between them was calculated by the concentration quenching method. [ABSTRACT FROM AUTHOR]

Mg 2+ -Ge 4+ ions substituted YAG: Ce 3+ phosphors (Y 3 Al 5-2x Mg x Ge x O 12 : Ce 3+ ) were prepared by high temperature solid state reaction method. X-ray diffraction (XRD), Scanning election microscope (SEM), Photoluminescence (PL) spectra and so on were used to characterize the samples. The effects of Mg 2+ -Ge 4+ concentrations on the morphology, structure, luminescence properties, fluorescence lifetime and white LED performance of YAG: Ce 3+ phosphors were studied in detail. The results indicate that Mg 2+ -Ge 4+ ion pairs can partially substitute the Al 3+ ions of YAG successfully. With the substitution, the garnet crystal structure remains unchanged. However the emission spectra show a progressive red-shift, from 528 to 552 nm (about 24 nm). The lifetime decreased rapidly from 84 to 26 ns. In particular, the correlated color temperature (CCT) decreases gradually from 6798 to 3261 K and the color rendering index (CRI) increases from 76.5 to 89.3 with the increasing of the incorporation content of Mg 2+ -Ge 4+ ion pairs. [ABSTRACT FROM AUTHOR]

Multi-component luminescence materials (Lu 0.09 Gd 0.91) 2 O 2 S: Er3+, Yb3+ with response wavelengths of 980 nm, 1064 nm, and 1550 nm were synthesized by the coprecipitation-high temperature solid-state reaction method. The optimum formula was obtained by the orthogonal experiment method. The effects of Lu3+ on crystal structure, fluorescence intensity, and temperature stability were systematically studied. The phase composition of the phosphors was analyzed by X-ray diffraction. With the increase of Lu3+ concentration, the fluorescence intensity first decreases, then increases slowly to a maximum, and finally decreases sharply. The sample exhibits characteristic emissions of red and green under three wavelengths of excitation. In addition, the up-conversion luminescence mechanisms excited at different wavelengths were discussed by means of the Intensity-Power test. Through a series of temperature spectra, it is found that the introduction of Lu3+ contributes to excellent temperature stability. Subsequently, the decay curve shows that the fluorescence lifetime of 554 nm increases first and then decreases with the increase of Lu3+ concentration, resulting from competition between γ and knr. This provides a useful idea for developing infrared detection materials with excellent temperature stability and luminescence properties. [Display omitted] • Gd 2 O 2 S: Er3+, Yb3+ phosphorse were prepared by the coprecipitation-high temperature solid-state reaction method. The composition of cations was optimized by the orthogonal experiments. • With the increase of Lu3+ concentration, the fluorescence intensity of the (Lu x Gd 1−x) 2 O 2 S: Er3+, Yb3+ phosphors first decreases, then increases slowly to a maximum, and finally decreases sharply. • With the increase of temperature, the total intensity of the (Lu 0.09 Gd 0.91) 2 O 2 S: Er3+, Yb3+ phosphors are higher than that of Gd 2 O 2 S: Er3+, Yb3+ phosphors. From 300 K to 400 K, the total intensity of the Gd 2 O 2 S: Er3+, Yb3+ phosphors changes irregularly. • With the increase of Lu3+ concentration, The lifetime of the (Lu x Gd 1−x) 2 O 2 S: Er3+, Yb3+ phosphors increases first and then decreases, which is similar to the observed trend of luminescence intensity. [ABSTRACT FROM AUTHOR]

The up-conversion composite fluoride phosphor Bi x Na y Y z F 3x + y+3z +3z+3m+3n : Er3+ m , Yb3+ n were synthesized using the optimized low-temperature combustion synthesis (LCS) method. The optimal formula was determined by step-by-step orthogonal experiments. The effects of the introduction of Bi3+ ions on phase formation and fluorescence intensity were systematically studied. The results indicate that introducing 10 mol% Bi3+ ions can substantially strengthen the dual-wavelength up-conversion fluorescence intensity of the sample. Then the temperature sensitivity of the sample is calculated, indicating that the sample has good temperature sensitivity and can be used as an effective material for temperature sensors. X-ray diffraction and scanning electron microscopy (SEM) were used to analyze the phase composition and morphology of the phosphor. The product exhibits characteristic emission of Er3+ ions under the excitation of 1550 nm ＆ 980 nm dual-wavelength, and its luminescence mechanism was studied. This work provides new ideas for studying photothermal dual response up-conversion fluoride phosphors under excitation at 1550 nm & 980 nm. • The composite fluoride phosphors Bi x Na y Y z F 3x + y+3z +3z+3m+3n : Er3+ m , Yb3+ n sensitive to 1550 nm& 980 nm were synthesized by the optimized low temperature combustion synthesis method. • The intrinsic reason for the enhanced up-conversion fluorescence of Er–Yb double-doped phosphors at 1550 nm is explained by the energy capture-reverse transfer theory. • When the introduction amount of Bi3+ ions is 10 mol%, the up-conversion luminescence of the nanoparticles was significantly enhanced at 1550 nm & 980 nm excitation. • The dual-wavelength temperature sensing performance of the phosphor was calculated, indicating that the phosphor has good temperature sensitivity. [ABSTRACT FROM AUTHOR]

Y 2 Mg 3 Ge 3 O 12 : RE3+ (RE ​= ​Tb, Eu, Tm) phosphors were prepared by solid phase method. XRD and EDS show that the samples were pure phases. The ET efficiency of Y 2 Mg 3 Ge 3 O 12 : Tb3+, Eu3+ can reach up to 96.63%, and the mechanism is d-d interaction. In Y 2 Mg3Ge 3 O 12 : Tb3+, Eu3+, Tm3+, the intensity of Tb3+ decreases with the increase of Eu3+ concentrations, and the intensity of Tm3+ is basically unchanged, the intensity of Eu3+ increased first and then decreased. Meanwhile, the ET efficiency can reach up to 77.53%. Moreover, the luminescence intensity at 423 ​K can still be maintained at 87–96.58% of that at the initial temperature. The value of CCT which shows a decreasing trend with increasing Eu3+ concentrations also indicates that warm white light can be obtained by triple doping of Tb3+-Eu3+-Tm3+. The above findings show that these samples are likely to be used in warm w-LEDs. Single-component Y 1.46-y Mg 3 Ge 3 O 12 : 0.5 ​Tb3+, 0.04 ​Tm3+, yEu3+ white phosphors with excellent thermal stability were prepared by high-temperature solid-phase method.In this paper, Y 1.46-y Mg 3 Ge 3 O 12 : 0.5 ​Tb3+, 0.04 ​Tm3+, yEu3+ garnet-type phosphors with near-UV excitation were successfully synthesized. The energy transfer efficiency reached 77.53%. Y 1.46-y Mg 3 Ge 3 O 12 : 0.5 ​Tb3+, 0.04 ​Tm3+, yEu3+ samples have good thermal stability. When the samples were heated to 423 ​K, the luminescence intensity could still reach more than 87% and 96% of the luminescence intensity at the initial temperature. [Display omitted] • Y 2 Mg 3 Ge 3 O 12 : Tb3+, Eu3+, Tm3+ phosphors were synthesized by high-temperature solid-phase method. • The intensity at 423K can still reach 87% of that at 303 K, indicating a good thermal stability. • The maximum energy transfer efficiency was 93.63% and 77.53%. [ABSTRACT FROM AUTHOR]

In this paper, SrS:Eu,Sm infrared up-conversion luminescent materials were successfully prepared by carbon assisted microwave sintering technology. X-ray diffraction and photoluminescence spectra were used to characterize the as-prepared SrS:Eu,Sm phosphors. The results indicated that the phosphors possessed the highest luminous efficiency when the microwave output power amounted to 750 W and the sintering time was 4 min. The SrS:Eu,Sm phosphors exhibited excellent luminescent properties under the ultraviolet and visible light. Upon the excitation of 276 nm ultraviolet light, five emission peaks centered at 379, 567, 589, 602 and 648 nm could be observed. The up-conversion response spectra ranged from 800 to 1600 nm, peaking at 1100 nm. The emission peak of up-conversion luminescence located at 599 nm. [ABSTRACT FROM AUTHOR]

A series of Dy3+ activated Ba(YLu) 2 Si 3 O 10 samples were prepared by high temperature solid-phase method. The purity of the phase was determined and the structural changes were analyzed. Under excitation at 350 nm, the BaY 2 Si 3 O 10 : Dy3+ phosphor shows two stronger luminescence peaks at 486 nm and 572 nm and weaker emission peak at 668 nm. In addition, with the continuous replacement of Y3+ in the matrix by Lu3+ ions, the chromaticity coordinates of samples in the system can be adjusted from the cold white region to the warm white region, and the luminescence performance of phosphors can be effectively improved. It was observed that the thermal stability of the phosphor was gradually enhanced with Lu3+ concentration increases, and the emission intensity of the BaLu 2 Si 3 O 10 : 0.04Dy3+ phosphor at 453 K could still maintain 83.78% of that at room temperature, which was discussed in conjunction with the Debye temperature and the rigid structure model to provide a reference for the improvement of the thermal stability performance. In addition, the increase of the concentration of Lu3+ ions doping will shorten the lifetime of phosphors due to the non-radiative energy transfer caused by the shortening of the ion distance in the lattice. • Ba(YLu) 2 Si 3 O 10 : Dy3+ phosphors with weak thermal quenching were synthesized. • The emission intensity of phosphor increased by 23.23% with increasing Lu3+ content from 0 to 2. • The chromaticity coordinates of samples can be effectively adjusted from the cold white region to the warm white region. • The emission intensity of the BaLu 2 Si 3 O 10 : 0.04Dy3+ could still maintain 83.78%. [ABSTRACT FROM AUTHOR]

A solid solution with double perovskite La 2-x-y Y x MgTiO 6 :yEu3+ system was prepared by high-temperature solid-phase method. The structure of the as-synthesized samples was obtained from XRD patterns and Rietveld refinement. Under the excitation of UV light at 396 nm, the samples appeared red at 616 nm. As the concentration of Eu3+ increases, the luminous intensity of La 2-y MgTiO 6 :yEu3+ phosphor gradually increases, and it shows an optimal luminous intensity where y = 0.20. Based on this, when x = 1.75, the optimum luminescence intensity of the sample is 154.1% and 131.4% of La 1·8 MgTiO 6 :0.2Eu3+ and Y 1·8 MgTiO 6 :0.2Eu3+, respectively. The thermal stability of La 1.8-x Y x MgTiO 6 :0.2Eu3+ was tested. compared with the sample with an initial temperature of 303 K, the luminescence intensity of the optimal sample decreased to 95.75% when the temperature reached 423 K. And the thermal stability of Y3+ doped phosphors increased 46.5% and 24.4% compared to the original La 1·8 MgTiO 6 :0.2Eu3+ and Y 1·8 MgTiO 6 :0.2Eu3+. The results indicate that it is a suitable candidate for lighting materials required by the modern market. • We have discovered a new La 2-x-y Y x MgTiO 6 :yEu3+ red phosphor, and prepared by high temperature solid phase method. • The emission intensity at 423 K can still reach 95.75% of 303 K, indicating a good thermal stability and practicality. • When x = 1.75, the luminescence properties are the best, and the intensity is 154% of LMT:0.2Eu3+ and 131% of YMT:0.2Eu3+. • The red lights demand of different plants at different growth stages can be met by adjusting the amount of phosphor. [ABSTRACT FROM AUTHOR]

Ca 1.5 Sr 1.5 (PO 4) 2 : Dy3+, Tb3+ phosphors were obtained by hydrothermal synthesis. XRD and SEM verify Dy3+ and Tb3+ into Ca 1.5 Sr 1.5 (PO 4) 2 : Dy3+, Tb3+ and the change of morphology in the process of Sr2+ ion occupying Ca2+ sites. The optimum doping concentrations of Dy3+ and Tb3+ were in 0.02 mol% and 0.04 mol%, and the corresponding mechanism exchange interaction and quadrupole-quadrupole mechanism, respectively. The emission spectra of Ca 1.5 Sr 1.5 (PO 4) 2 : Dy3+, Tb3+ phosphors excited at 368 nm were composed of emission peaks at 481 nm, 573 nm of Dy3+ and at 487 nm, 543 nm, 584 nm, 621 nm of Tb3+. Energy transfer mechanism was dipole-dipole mechanism. The emission intensity of Dy3+ retained about 74.50% and Tb3+ was 75.19% at 500 K comparing with the initial temperature of 300 K. The Ca 1.5 Sr 1.5 (PO 4) 2 : Dy3+, Tb3+ phosphors had better thermal stability, and the activation energy was estimated to be 0.14 – 0.15 eV. The color of phosphors tuned from white light to green-white light. The Ca 1.5 Sr 1.5 (PO 4) 2 : Dy3+, Tb3+ phosphors provide a strategy for tunable luminescence in LED with UV chip. • Ca 1.5 Sr 1.5 (PO 4) 2 : Dy3+, Tb3+ phosphors were synthesized via the hydrothermal synthesis. • XRD and SEM verify Dy3+ and Tb3+ into Ca 1.5 Sr 1.5 (PO 4) 2 and the change of morphology in the process of Sr2+ replaces Ca2+. • The emission intensity of Dy3+ retained about 74.50% and Tb3+ was 75.19% at 500 K comparing with 300 K. • The Ca 1.5 Sr 1.5 (PO 4) 2 : Dy3+, Tb3+ phosphors had better thermal stability. • The color of phosphors tuned from white light to green-white light. [ABSTRACT FROM AUTHOR]

Abstract: Infrared up-conversion material CaS:Eu, Sm was synthesized by the low-temperature combustion synthesis (LCS) method, which has expanded the application range of the LCS method which is always used in the synthesis of oxides and compound oxides. The combustion process was discussed and the effect of the amount of carbamide on the up-conversion luminescence properties was analyzed. XRD patterns show that the products are with the cubic CaS crystal structure. Spectral analysis indicates that the sample can be excited effectively by ultraviolet or visible light to store energy, and subsequently is sensitive to 800–1600nm infrared light and then emit red light resulting from the multi-transitions of Eu2+ 4f65d→4f7(8S7/2). [Copyright &y& Elsevier]

A series of Y 2-x-y Mg 3 Ge 3 O 12 : xDy3+, yTb3+ samples were manufactured by high temperature solid phase method. XRD test and Rietveld refinement clarified the phase purity of the samples. When the excitation wavelength is 352 nm, the energy transfer efficiency is 57.74%, and q-q interaction is the main energy transfer mechanism of Dy3+-Tb3+ co-doped samples. In addition, we tested the thermal stability of Y 1.94 Mg 3 Ge 3 O 12 :0.05Dy3+, 0.01 Tb3+ sample, and found that its luminous intensity at 423 K could still reach 93.86% of that at 303 K. By changing the concentrations of Tb3+, the luminescent color of the samples could also be changed from blue-white light to yellow-green light. These results indicate that Y 2 Mg 3 Ge 3 O 12 co-doped with Dy3+ and Tb3+ is expected to be applied in the field of white light LEDs. • Y 2-x-y Mg 3 Ge 3 O 12 : xDy3+, yTb3+ phosphors with weak thermal quenching were synthesized by high-temperature solid-phase method. • The emission intensity at 423 K can reach 93.86% of that at room temperature, indicating a good thermal stability. • As the concentrations of Tb3+ increase, the energy transfer efficiency increases from 25.51% to 57.74%. [ABSTRACT FROM AUTHOR]

A battery of Dy3+ single-doped and Dy3+/Eu3+ co-doped Y 2 Mg 3 Ge 3 O 12 phosphors were manufactured by high-temperature solid-phase method. The XRD patterns were tested and Rietveld refined. When the samples were excited by 352 ​nm near ultraviolet light, the energy transfer efficiency can reach 83.2%, and the energy transfer mechanism is electric dipole-electric dipole interaction. The thermal stability of Y 1.75 Mg 3 Ge 3 O 12 :0.05Dy3+, 0.2Eu3+ was tested. When the temperature reached 150 ​°C, its luminous intensity droped to 92.4% of the initial temperature (30 ​°C). By changing the concentrations of Eu3+, white light with red light can be obtained. The above results indicate that these samples are expected to become candidate materials in the domain of solid-state lighting. In this paper, a near-ultraviolet excited garnet type Y 2 Mg 3 Ge 3 O 12 : Dy3+/Eu3+ phosphors were synthesized successfully. The energy transfer efficiency reaches 83.2%. The Y 1.95-y Mg 3 Ge 3 O 12 : 0.05Dy3+, yEu3+ samples have excellent thermal stability. When the sample was heated to 150 ​°C, the luminous intensity can still reach 92.4% of the luminous intensity at the initial temperature. [Display omitted] • Y 1.95-y Mg 3 Ge 3 O 12 :0.05Dy3+, yEu3+ were synthesized by high temperature solid phase method. • For Y 1.95-y Mg 3 Ge 3 O 12 : 0.05Dy3+, yEu3+ phosphors, the energy transfer efficiency is calculated to be 83.2%. • The emission intensity can still reach 92.4% at 423K of that at room temperature. [ABSTRACT FROM AUTHOR]

[Display omitted] • Bi3+-doped X-mayenite phosphors was synthesized via solid-state reaction method. • O-mayenite:Bi3+ exhibits a single blue emission band peaking at 452 nm. • F- and Cl-mayenite:Bi3+ phosphors show additonal ultraviolet emissions at 375 nm. • Emission color of Cl-mayenite:Bi3+ can be tuned by controlling the encaged anion. A series of Bi3+-doped X-mayenite (X = O, F, Cl) phosphors was synthesized via the conventional solid-state reaction method. Upon excitation at 325 nm, Bi3+-doped O-mayenite exhibits a single blue emission band peaking at 452 nm, which is assigned to the 3P 1 →1S 0 transitions of Bi3+ ions. For F-mayenite:Bi3+ and Cl-mayenite:Bi3+ phosphors, there is a new dominant ultraviolet emission centered at 375 nm and a weak blue emission. The luminescent dynamical process proves that two emission centers exist in F-mayenite:Bi3+ and Cl-mayenite:Bi3+. Our results confirm that the ultraviolet emission originates from the transitions of Bi3+ with Cl− or F− ions surrounded, and the blue emission corresponds to the transitions of Bi3+ with O2− ions surrounded. In addition, the emission color of Cl-mayenite:Bi3+ can be tuned both by controlling the encaged anions and Bi3+ content. We demonstrate that anion control is a new desirable strategy for photoluminescence tuning. [ABSTRACT FROM AUTHOR]

In this paper, Dy3+ doped and Dy3+/Eu3+ co-doped Ca 3 (PO 4) 2 phosphors were prepared through hydrothermal synthesis method. pH value in the initial reaction solution had an important effect on the determination of phosphate morphology. With the increase of pH value, the morphology of samples changed from nanorods to nano-spherical grains. The Ca 3 (PO 4) 2 : Dy3+ phosphors could be efficiently excited by 350 nm and its concentration quenching occurred when the concentration of Dy3+ was beyond 0.03 due to dipole-dipole interaction. With increasing content of Eu3+ in Ca 3 (PO 4) 2 : Dy3+, Eu3+ phosphors, the emission intensity of Dy3+ decreased, and that of Eu3+ increased to maximum when Eu3+ concentration was 0.08, and then decreased. The energy transfer (ET) from Dy3+ to Eu3+ in Ca 3 (PO 4) 2 host was expressed through the quadrupole-quadrupole mechanism, and the maximum of ET efficiency was 82.40%. When Ca 3 (PO 4) 2 : Dy3+, Eu3+ phosphors excited by 362 nm, the CIE coordinates ranged from (0.295, 0.330) to (0.367, 0.326). Moreover, the samples had good thermal stability. The emission intensity of the sample at 460 K decreased to 85.67% of that at 300 K. Our results display that Ca 3 (PO 4) 2 : Dy3+/Eu3+ phosphors are potential candidate for applications in the near-UV pumped warm white LEDs. • Dy3+, Eu3+ doped Ca 3 (PO 4) 2 warm-white-emitting phosphors were synthesized via the hydrothermal synthesis method. • The optimal doping concentration of Eu3+ ions was found to be 8 mol%. • With the increase of pH value, the morphology of samples changed from nanorods to nano-spherical grains. • The energy transfer efficiency of the phosphor was 82.40%. • The phosphor possessed excellent thermal stability. The emission intensity at 460 K decreased to 85.67% of that at 300 K. [ABSTRACT FROM AUTHOR]

Sm3+ ions doped Na 4 CaSi 3 O 9 and Sm3+-Eu3+ co-doped Na 4 CaSi 3 O 9 novel phosphors were prepared via conventional solid-state reaction method. The structure, photoluminescence (PL) properties and thermostability of samples were investigated in detail. Rietveld refinement and XRD patterns are in good agreement with the structure of Na 4 CaSi 3 O 9. The phosphors can be effectively excited by 405 nm irradiation to produce light emission. Under the excitation of 405 nm irradiation, the Na 4 CaSi 3 O 9 : Sm3+ phosphors show three broadband emission centered at about 564 nm, 603 nm and 650 nm due to the 4G 5/2 →6H J (J = 5/2,7/2,9/2) forbidden transition of Sm3+ ions and the Sm3+-Eu3+ co-doped Na 4 CaSi 3 O 9 phosphors show yellow broadband emission centered at about 564 nm and an orange-red emission band at 592 nm and 613 nm, due to the 4G 5/2 → 6H 5/2 transition of Sm3+ ions and the 5D 0 →7F 1 , 5D 0 →7F 2 transition of Eu3+ ions, respectively. The energy transfer mechanism between Sm3+ and Eu3+ ions is electric dipole-electric dipole interaction. The temperature-dependent luminescent properties of Na 4 CaSi 3 O 9 :Sm3+, Eu3+ ions are measures from 30 °C to 210 °C, and the results show that the luminous intensity of sample at 150 °C is up to 80% of that at room temperature, which indicate that the phosphor has good thermal stability. The above results show that this series of phosphors will have potential applications in near-UV excited white LEDs. • The electric dipole-electric dipole interaction dominates energy transfer. • The luminous intensity at 150 °C is 80% of at room temperature when x = 0.04, y = 0.3. • We can obtain the tunable emission from orange to red in co-doped phosphors. • The enhancement in the f-f absorptions of Sm3+ with increasing Eu3+ concentration. [ABSTRACT FROM AUTHOR]

SrB 2 Si 2 O 8 : Tb3+ and SrB 2 Si 2 O 8 : Ce3+, Tb3+ phosphors were synthesized through conventional high temperature solid state reaction method. Under near ultraviolet (NUV) excitation of 377 nm, the emission peaks of the SrB 2 Si 2 O 8 : Tb3+ green phosphor located at 489, 544, 585 and 623 nm corresponding to Tb3+ ions energy level transition of 5D 4 excitation state to 7F 6 , 7F 5 , 7F 4 and 7F 3 ground states, respectively. The optimal concentration of Tb3+ ions is 11at.%, and the concentration quenching mechanism can be interpreted by the dipole-quadrupole interaction of Tb3+ ions. For the Sr 1-x B 2 Si 2 O 8 : Ce3+, xTb3+ phosphors, the maximum luminescence intensity is 21 times higher than that of the single doped Tb3+, which originates from the energy transfer of Ce3+ to Tb3+ ions. The energy transfer efficiency is calculated to be 79.7%, which is caused by the dipole-dipole resonant type. The CIE coordinates of SrB 2 Si 2 O 8 : Ce3+, Tb3+ phosphors change from blue (0.167, 0.071) to green (0.241, 0.546). When the temperature reaches 210 °C, the luminescence intensity reaches 72.20% of the initial value, indicating that the materials have good thermal stability. The above consequences demonstrate that the SrB 2 Si 2 O 8 : Ce3+, Tb3+ phosphors can be used as a candidate for a promising green luminescent phosphor in ultraviolet excited W-LEDs. Energy level diagram of energy transfer in the SrB 2 Si 2 O 8 : Ce3+, Tb3+ phosphors; CIE diagram of Ce3+/Tb3+ doped SrB 2 Si 2 O 8 phosphors. Image 1 • Ce3+, Tb3+ co-doped energy transfer was first proposed in SrB 2 Si 2 O 8 phosphor. • The energy transfer efficiency of Ce3+ to Tb3+ is as high as 79.7%. • The luminescence intensity of Ce3+, Tb3+ co-doped is 21 times higher than that of single-doped Tb3+. • The energy transfer from Ce3+ to Tb3+ is caused by the resonance of the dipole-dipole. • Ce3+, Tb3+ co-doped SrB 2 Si 2 O 8 phosphors have potential applications in ultraviolet excited W-LEDs. [ABSTRACT FROM AUTHOR]