Luminescence and Energy Transfer in Europium and Bismuth Codoped Trisodium Yttrium Silicates
XIE Guo-Bo**
Faculty of Computer, Guangdong University of Technology, Guangzhou 510006
Abstract :Bi3+ and Eu3+ doped Na3 YSi2 O7 phosphors are prepared with solid state reactions. The luminescence properties of Bi3+ and Eu3+ in Na3 YSi2 O7 and the energy transfer (ET) from Bi3+ to Eu3+ are investigated in detail. The ET mechanism is also discussed. Bi3+ in Na3 YSi2 O7 emits near-ultraviolet (UV) light in a broad band peaking at 394 nm which can be attributed to the transition from excited states 3 P 0, 1 to ground state 1 S 0 under the excitation of UV light with a wavelength of 309 nm. Eu3+ in Na3 YSi2 O7 emits orange and red light. The co-doping of Bi3+ into Eu3+ doped Na3 YSi2 O7 introduces an intense absorption band from 270 to 350 nm due to ET from Bi3+ to Eu3+ . The sensitization effect of Bi3+ on Eu3+ makes it possible that Bi3+ and Eu3+ co-doped Na3 YSi2 O7 could be used in AlGaN-based UV light emitting diodes as a red phosphor.
收稿日期: 2013-03-26
出版日期: 2013-11-21
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