Potential color tunable Sr3LaNa(PO4)3F:Eu2+/Tb3+/Mn2+ phosphor induced by Eu2+ → Tb3+ and Tb3+ → Mn2+ energy transfer for WLEDs
Literature Information
Mengmeng Jiao, Chuanlu Yang, Yalin Li, Dongxu Wang, Hongpeng You
Color tunable Sr3LaNa(PO4)3F:Eu2+,Tb3+ and Sr3LaNa(PO4)3F:Tb3+,Mn2+ phosphors were prepared by a high temperature solid state reaction. The crystal structure, luminescence properties, and energy transfer mechanism of the samples were investigated in detail. The Eu2+ doped phosphors can be efficiently excited in the range from 250 to 410 nm, which matches well with the commercial n-UV LED chips. Utilizing the energy transfer from Eu2+ to Tb3+ ions, tunable colors from blue to green were obtained under the irradiation of 405 nm. The mechanism of the Eu2+ → Tb3+ energy transfer was demonstrated to be a dipole–quadrupole interaction in terms of the experimental results and analysis of the photoluminescence spectra and decay curves of the phosphors. Moreover, the thermal stability and quantum efficiency of the Eu2+ and Tb3+ co-doped phosphors were studied. For the Sr3LaNa(PO4)3F:Tb3+,Mn2+ samples, tunable green-orange emissions were obtained by changing the relative ratio of Tb3+ and Mn2+ ions under 230 nm irradiation. The investigation results suggest that color tunable phosphors with potential for WLEDs were obtained utilizing the energy transfer process.
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