Search

We successfully synthesized Sr3Gd2(BO3)4:Eu3+ (SGBO:Eu3+) and Sr3Y2(BO3)4:Eu3+ (SYBO:Eu3+) phosphors through a high-temperature solid-state reaction. The structure was shown by x-ray powder diffraction and the irregular morphology of SGBO:Eu3+ and SYBO:Eu3+ phosphors was seen by a field emission scanning electron microscope. Additionally, the photoluminescence excitation spectra and emission spectra were also presented. As shown in the results, the phosphors could be stimulated by near ultraviolet light and then exhibited red light emission, which is consistent with the calculated color coordinates. The quenching concentrations of Eu3+ in SYBO and SGBO hosts are much higher than that in other borate hosts. In particular, far-red light-emitting at 702 nm due to the transition of 5D0 → 7F4 is beneficial to plant growth. The results show that the prepared samples have application value in white light emitting diodes.

ALa9(SiO4)6O2: Eu3+ (A = Li, Na) oxyapatite phosphors have been synthesized via traditional solid-state methods X-ray powder diffraction (XRD) analysis confirmed the phase formation of ALa9(SiO4)6O2: Eu3+ (A = Li, Na) materials. The scanning electron microscope (SEM) image exhibited the irregular morphology of ALa9(SiO4)6O2: Eu3+ (A = Li, Na) particles. The photoluminescence excitation (PLE) and emission (PL) spectra were investigated. The results showed that the phosphor could be efficiently excited by the near ultraviolet (NUV) light, and it exhibited red light emission. The calculated color coordinates lies in the red region. All the obtained results suggest that the prepared phosphors exhibit great potential application as red emitting phosphor for near ultraviolet white light emitting diodes (NUV WLEDs).

A novel red-emitting phosphor LiY 9 (SiO 4 ) 6 O 2 :Eu 3+ has been synthesized by a high-temperature solid-state reaction. X-ray powder diffraction (XRD) analysis confirmed the phase formation of LiY 9 (SiO 4 ) 6 O 2 :Eu 3+ materials. The photoluminescence excitation and emission spectra, and the concentration dependence of the emission intensity of the phosphor were investigated. The results showed that the phosphor could be efficiently excited by the near ultraviolet (NUV) light and blue light, and it exhibited red light emission. The calculated color coordinates lies in the red region. Therefore, these obtained results suggest that the prepared phosphors exhibit great potential for use as red emitting phosphor for near ultraviolet white light emitting diodes (NUV WLEDs).

A novel blue-emitting apatite structure phosphate phosphor Sr5(PO4)2SiO4: Ce3+, Tb3+ has been synthesized by a high-temperature solid-state reaction. X-ray diffraction (XRD), scanning electric microscopy (SEM), ultraviolet–visible diffuse reflectance spectra (UV–Vis DRS), photoluminescence excitation (PLE) and emission (PL) spectra were utilized to characterize the samples. The results showed that the Sr5(PO4)2SiO4: Ce3+, Tb3+ samples exhibit a wide and strong emission band located at 405 nm. In addition, the process of energy transfer (ET) from Ce3+ to Tb3+ has been proved to be a dipole-dipole interaction. Importantly, the color of the phosphor emission can be changed by proper tuning of the Ce3+/Tb3+ ratio. Therefore, the prepared phosphors exhibit great potential for applications in the fields of luminescence and display.

A novel red-emitting phosphor La 0.67 Mg 0.5 W 0.5 O 3 :Eu 3+ has been synthesized by a high-temperature solid-state reaction. X-ray powder diffraction (XRD) analysis confirmed the phase formation of La 0.67 Mg 0.5 W 0.5 O 3 :Eu 3+ materials. The photoluminescence excitation and emission spectra, the concentration dependence of the emission intensity, and decay curves of the phosphor were investigated. The results showed that the phosphor could be efficiently excited by the near ultraviolet (NUV) light and blue light, and it exhibited red light emission. The decay time was also determined for various concentrations of Eu 3+ in La 0.67 Mg 0.5 W 0.5 O 3 . The calculated color coordinates lies in the red region. Therefore, these obtained results suggest that the prepared phosphors exhibit great potential for use as red emitting phosphor for near ultraviolet white light emitting diodes (NUV WLEDs)