Abstract
Co-doping with Sm3+ ions into the Eu3+-doped phosphors can bring interesting properties due to the energy transfer of Sm3+→Eu3+. Herein, Sm3+/Eu3+ co-doped phosphors Li3Ba2La3(WO4)8:xSm3+/yEu3+ were synthesized to witness this fact. Upon excitation of 404 nm light, Sm3+/Eu3+ co-doped phosphors show the characteristic emissions of both Sm3+ and Eu3+. The intensity of Sm3+ emission decreases along with the improving Eu3+ concentration, whereas the intensity of Eu3+ emission gets promoted. For Li3Ba2La2.87Sm0.08Eu0.05(WO4)8, the quantum yield reaches up to 53%. Moreover, co-doping Sm3+/Eu3+ phosphor Li3Ba2La2.87Sm0.08Eu0.05(WO4)8 possess better fluorescence thermostability than sole Eu3+ doping phosphor Li3Ba2La2.87Sm0.08Eu0.05(WO4)8, by a factor of about two. The total PL integral intensity at 450 K of Li3Ba2La2.87Sm0.08Eu0.05(WO4)8 remains 83% of that at 300 K, ensuring its applications in high power White Light Emitting Diodes (WLED).
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