Effect of electron traps on long afterglow behavior of Sr_3Al_2O_6:Eu_(0.01)^(2+),Dy_(0.02-x)^(3+),Ho_x^(3+)  

作　　者：李亚 王银海 熊毅 彭铁球 莫茂松 

机构地区：[1]School of Physics and Optoelectronic Engineering,Guangdong University of Technology [2]Advanced Electronic Materials Institute,Gen-eral Research Institute of Nonferrous Metals

出　　处：《Journal of Rare Earths》2012年第2期105-109,共5页稀土学报（英文版）

基　　金：Project supported by the National Natural Science Foundation of China (20871033)

摘　　要：The long persistent phosphors Sr3Al2O6：Eu0.012＋,Dy0.02-x3＋,Hox3＋ （x=0, 0.01, 0.02） were prepared by a high temperature solid state reaction. All samples showed a broad band emission peaking at 510 nm, which could be ascribed to Eu2＋ transition between 4f65d1 and 4f7 electron configurations. With the increase of substitution of Ho3＋ ions for the Dy3＋ ions in the as-prepared phosphors Sr3Al2O6：Eu0.012＋,Dy0.02-x3＋,Hox3＋ （x=0, 0.01, 0.02）, the initial intensity of the afterglow obviously decreased. From the thermoluminescence （TL） curves of the samples, we concluded that codoped Ho3＋ ions led to a decline of the trap depth and redistribution of the trap. This may be responsible for the change of afterglow of Sr3Al2O6：Eu0.012＋,Dy0.02-x3＋,Hox3＋ （x=0, 0.01, 0.02）.The long persistent phosphors Sr3Al2O6：Eu0.012＋,Dy0.02-x3＋,Hox3＋ （x=0, 0.01, 0.02） were prepared by a high temperature solid state reaction. All samples showed a broad band emission peaking at 510 nm, which could be ascribed to Eu2＋ transition between 4f65d1 and 4f7 electron configurations. With the increase of substitution of Ho3＋ ions for the Dy3＋ ions in the as-prepared phosphors Sr3Al2O6：Eu0.012＋,Dy0.02-x3＋,Hox3＋ （x=0, 0.01, 0.02）, the initial intensity of the afterglow obviously decreased. From the thermoluminescence （TL） curves of the samples, we concluded that codoped Ho3＋ ions led to a decline of the trap depth and redistribution of the trap. This may be responsible for the change of afterglow of Sr3Al2O6：Eu0.012＋,Dy0.02-x3＋,Hox3＋ （x=0, 0.01, 0.02）.

关 键 词：electron transfer defect band THERMOLUMINESCENCE trap energy level rare earths 

分 类 号：O614.33[理学—无机化学]