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The structures and luminescence properties of Sr4Gd3Na3(PO4)6F2:Ce3+,Tb3+ green phosphors with zero-thermal quenching of Tb3+ for WLEDs.

In this paper, novel green-emitting Sr4Gd3Na3(PO4)6F2:Ce3+,Tb3+ phosphors with zero-thermal quenching of Tb3+ have been prepared and investigated. X-ray diffraction together with Rietveld structure refinement was employed to give an insight… Click to show full abstract

In this paper, novel green-emitting Sr4Gd3Na3(PO4)6F2:Ce3+,Tb3+ phosphors with zero-thermal quenching of Tb3+ have been prepared and investigated. X-ray diffraction together with Rietveld structure refinement was employed to give an insight into the structures of the samples. The luminescence spectra at 300 K and 80 K confirmed that the Ce3+ ions in Sr4Gd3Na3(PO4)6F2:Ce3+ were distributed randomly on the cation sites and gave intense emission. Utilizing the Ce3+ → Tb3+ energy transfer, intense green emitting Sr4Gd3Na3(PO4)6F2:Ce3+,Tb3+ had been obtained. The energy migration mechanism of Ce3+ in Sr4Gd3Na3(PO4)6F2:Ce3+ and the energy transfer mechanism of Ce3+ → Tb3+ in Sr4Gd3Na3(PO4)6F2:Ce3+,Tb3+ were determined by the analysis of photoluminescence spectra and decay curves. Sr4Gd3Na3(PO4)6F2:Ce3+,Tb3+ exhibited a thermal-induced enhancement of Tb3+ emission at 25-300 °C, indicating an excellent thermal stability. Moreover, utilizing our prepared Sr4Gd3Na3(PO4)6F2:0.06Ce3+,0.15Tb3+ phosphor, green and white emitting LED devices have been fabricated. Our investigation indicated the potential application of prepared green phosphors in UV WLEDs and a feasible method to explore highly thermally stable phosphors utilizing the high thermal stability of donors together with energy transfer from donors to acceptors.

Keywords: ce3; 6f2 ce3; sr4gd3na3 po4; tb3; ce3 tb3; po4 6f2

Journal Title: Dalton transactions
Year Published: 2019

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