Photo- and thermoluminescence of BaGa2S4 : Eu2+ and BaGa2S4 : Eu2+,Ce3+ crystalsстатья
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Дата последнего поиска статьи во внешних источниках: 18 июля 2013 г.
Аннотация:Data are presented on the photo- and thermoluminescence of polycrystalline BaGa2S4:Eu2+ and BaGa2S4:Eu2+, Ce3+ at temperatures from 77 to 300 K. The broad photoluminescence band at 505 nm in BaGa2S4:Eu2+ is shown to be due to the 4f(6)5d -> 4f(7) transition. The broad emission bands at 460 and 510 nm in BaGa2S4:Ce3+ arise from the 5D (D-2(3/2)) -> 4f(2)(F-2(5/2)) and 5D(D-2(3/2)) -> 4f(2)(F-2(7/2)) transitions. Codoping of BaGa2S4 with Eu2+ and Ce3+ increases the luminescence efficiency owing to energy transfer from Ce3+ to Eu2+. The thermoluminescence data were used to evaluate the energies of the traps involved: 0.26, 0.31, 0.42, 0.57, and 0.64 eV in BaGa2S4: Eu2+ and 0.28, 0.32, 0.54, 0.61, and 0.65 eV in BaGa2S4:Eu2+, Ce3+.