Substitution priority of Eu^(2+) in multi-cation compound Sr_(0.8)Ca_(0.2)Al_2Si_2O_8 and energy transfer  

作　　者：杨志平 李振玲 王志军 李盼来 田苗苗 程金阁 王超 

机构地区：[1]College of Physics Science & Technology, Hebei Key Laboratory of Optic-Electronic Information and Materials,Hebei University

出　　处：《Chinese Physics B》2018年第1期570-578,共9页中国物理B（英文版）

基　　金：Project supported by the National Natural Science Foundation of China(Grant Nos.51672066 and 50902042);Funds for Distinguished Young Scientists of Hebei Province,China(Grant No.A2015201129);Personnel Training Project of Hebei Province,China(Grant No.A2016002013)

摘　　要：A blue phosphor was obtained by doping Eu2＋ into a multi-cation host Sro.8Cao.2Al2Si208 through high tempera- ture solid state reaction. The emission spectra show a continuous red-shift behavior from 413 nm to 435 nm with Eu2＋ concentration increasing. The substitution priority of Eu2＋ in Sro.8Cao.2AI2Si208 was investigated via x-ray diffraction （XRD） and temperature properties in detail： the Ca2＋ ions are preferentially substituted by Eu2＋at lower doping, and with the Eu2＋ concentration increasing, the probability of substitution for Sr2＋ is greater than that of replacing Ca2＋. Accord- ingly, we propose the underlying method of thermal property to determine the substitution of Eu2＋ in the multi-cation hosts. Moreover, the abnormal increase of emission intensity with increasing temperature was studied by the thermolumi- nescence spectra. The energy transfer mechanism between the Eu2＋ ions occupying different cation sites was studied by the lifetime decay curves. A series of warm white light emitting diodes were successfully fabricated using the blue phos- phors Sro.gCao.2A12Si208： Eu2＋ with commercial red phosphor （Ca Sr）SJA1N3： lu2＋ and green phosphor （Y Lu）jA15Or2 ： Ce3＋, and the luminescent efficiency can reach 45 lm/W.A blue phosphor was obtained by doping Eu2＋ into a multi-cation host Sro.8Cao.2Al2Si208 through high tempera- ture solid state reaction. The emission spectra show a continuous red-shift behavior from 413 nm to 435 nm with Eu2＋ concentration increasing. The substitution priority of Eu2＋ in Sro.8Cao.2AI2Si208 was investigated via x-ray diffraction （XRD） and temperature properties in detail： the Ca2＋ ions are preferentially substituted by Eu2＋at lower doping, and with the Eu2＋ concentration increasing, the probability of substitution for Sr2＋ is greater than that of replacing Ca2＋. Accord- ingly, we propose the underlying method of thermal property to determine the substitution of Eu2＋ in the multi-cation hosts. Moreover, the abnormal increase of emission intensity with increasing temperature was studied by the thermolumi- nescence spectra. The energy transfer mechanism between the Eu2＋ ions occupying different cation sites was studied by the lifetime decay curves. A series of warm white light emitting diodes were successfully fabricated using the blue phos- phors Sro.gCao.2A12Si208： Eu2＋ with commercial red phosphor （Ca Sr）SJA1N3： lu2＋ and green phosphor （Y Lu）jA15Or2 ： Ce3＋, and the luminescent efficiency can reach 45 lm/W.

关 键 词：LUMINESCENCE PHOSPHORS energy transfer substitution priority 

分 类 号：O4[理学—物理]