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Abstract A series of Ca 8 ZnLa(PO 4) 7 (CZLPO) phosphors doped with Tb3+ and Tb3+, Eu3+ have been synthesized using a high-temperature solid-state method. The XRD pattern verifies that all prepared samples are attributed to whitlockite-type structure of β-Ca 3 (PO 4) 2 with R3c (161) space group. Under 366 nm excitation, the CZLPO: Tb3+, Eu3+ phosphors exhibit a tunable multi-color emission owing to energy transfer from Tb3+ to Eu3+ via a quadrupole-quadrupole interaction mechanism. The emission colors of the phosphors could be modulated from green to red under NUV (366 nm) excitation due to efficient Tb3+→Eu3+ energy transfer. The fluorescence intensity ratio (I 542nm /I 611nm) for the Tb3+→Eu3+ of this material displayed excellent temperature sensing properties between 298 and 498 K. Moreover, it was found that the intensity ratio was unchanged when the temperature was cycled between 298 and 498 K, thus demonstrating the recyclability of this system. These results show that CZLPO: Tb3+, Eu3+ phosphors have potential as high performance multifunctional materials for solid state lighting and temperature sensing applications. Graphical abstract Image 1 Highlights • Whitlockite-type Ca 8 ZnLa(PO 4) 7 :Tb3+, Eu3+ phosphors were designed. • Ca 8 ZnLa(PO 4) 7 :Tb3+, Eu3+ phosphors exhibit a tunable multi-color emission. • The energy transfer mechanism from Tb3+ to Eu3+ were investigated. • Ca 8 ZnLa(PO 4) 7 :Tb3+,Eu3+ phosphors display excellent temperature sensing property from 298 K to 498 K. • This work provides an effective and feasible pathway for the exploration of mmultifunctional applications materials. [ABSTRACT FROM AUTHOR]

A series of reddish orange light-emitting NaBaLa 2 (PO 4 ) 3 : Sm 3+ (NBLP:Sm 3+ ) phosphors are designed and synthesized in this work for the first time. The crystal structure of NaBaLa 2 (PO 4 ) 3 (NBLP) has been studied by the Rietveld refinement analysis, which shows that the NBLP belongs to eulytite-type orthophosphate. Luminescence properties of NBLP:Sm 3+ phosphors were investigated in detail, including excitation and emission spectra, concentration quenching, fluorescence decay, Inokuti-Hirayama (I-H) model analysis, etc. The Commission Internationale de L'Eclairage (CIE) coordinates exhibited a shift slightly from reddish-orange (0.5782, 0.4171) to orange (0.5605, 0.4312) with the increase of Sm 3+ concentration. In addition, the NBLP:Sm 3+ phosphor shows good thermal stability and acceptable quantum efficiency. From the obtained results, the prepared phosphor NBLP: Sm 3+ can be demonstrated as a potential orange-red luminescent material. [ABSTRACT FROM AUTHOR]