Abstract
A series of Tb3+–Sm3+-codoped Na3Bi(PO4)2 phosphors have been prepared by a high-temperature solid-state reaction, and their luminescence properties have been investigated in detail. The energy transfer process from Tb3+ to Sm3+ was verified through luminescence spectra and fluorescence decay curves. Moreover, the energy transfer mechanism was demonstrated to be the dipole–dipole interaction and the ET efficiency as well as quantum efficiency was also estimated. By controlling the doping content of the Sm3+ ions with the fixed Tb3+ content, the emission color of the obtained phosphors could be easily modulated from green to yellow and then to yellow-white. Additionally, as the temperature increases from RT to 150 °C, the PL intensity of transition of Sm3+ decreased to 79 %, which prove good thermal stability of Na3Bi(PO4)2:xSm3+,0.1Tb3+ phosphors. All the results indicate that the series of Na3Bi(PO4)2:xSm3+,0.1Tb3+ phosphors can be acted as a good candidate for the application in white light-emitting diodes.
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