Tuning the color purity of LaAlO_3:Eu^(3+) red phosphor by the cross relaxation  

作　　者：毛智勇 王达健 刘艳花 费沁妮 郑玺 徐所成 仇坤 

机构地区：[1]School of Materials Science and Engineering,Tianjin University of Technology [2]Key Laboratory for Photoelectric Materials and Devices,Tianjin University of Technology [3]Key Laboratory on Display Materials and Photoelectric Devices,Ministry of Education,Tianjin University of Technology

出　　处：《Optoelectronics Letters》2010年第2期116-119,共4页光电子快报（英文版）

基　　金：supported by the National Natural Science Foundation of China (No.50872091);the Science and Technology Programs of Tianjin in China (No.2006ZD30)

摘　　要：Precisely adjusting the color purity of LaAlO3:Eu3+ red phosphor with 593 and 618 nm emissions is achieved in a strategy of suppressing transitions of high energy levels of Eu3+ ions through varying the doping concentration.As the doping concentration increases,the transitions from high levels 5D3,2,1 will be weakened,while those from 5D0 are enhanced up to a critical value with the aid of the cross relaxation.As a result,an increase of the color purity from 95.2% to 97.4% is obtained.It indicates that the red phosphor could be one of the excellent red-light-emitting phosphors in illuminating and display devices.Precisely adjusting the color purity of LaAlO3：Eu3＋ red phosphor with 593 and 618 nm emissions is achieved in a strategy of suppressing transitions of high energy levels of Eu3＋ ions through varying the doping concentration. As the doping concentration increases, the transitions from high levels 5D3.2,1 will be weakened, while those from 5D0 are enhanced up to a critical value with the aid of the cross relaxation. As a result, an increase of the color purity from 95.2% to 97.4% is obtained. It indicates that the red phosphor could be one of the excellent red-light-emitting phosphors in illuminating and display devices.

关 键 词：红色荧光粉 色纯度 铕离子 铝酸镧 交叉弛豫 调谐 掺杂浓度 能量水平 

分 类 号：TN104.3[电子电信—物理电子学] TN873.3