A novel blue-emitting KCa_4(BO_3)_3:Ce^(3+)phosphor for white LED application  

作　　者：孙晓慧 张朝民 吴建宝 朱鹏飞 张修丽 杭寅 

机构地区：[1]College of Fundamental Studies,Shanghai University of Engineering Science,Shanghai 201620,China [2]Shanghai Institute of Optics and Fine Mechanics,Chinese Academy of Sciences,Shanghai 201800,China

出　　处：《Journal of Rare Earths》2016年第6期571-575,共5页稀土学报（英文版）

基　　金：Project supported by the National Natural Science Foundation of China(51302283);Natural Science Foundation of Shanghai(13ZR1463400);Innovation Program of Shanghai Municipal Education Commission(15ZZ093)

摘　　要：A blue-emitting phosphor KCa_4（BO_3）_3 doped with Ce^（3＋） was prepared by solid state reaction. Its phase purity and synthesis temperature were investigated by powder X-ray diffraction（XRD）. The optical properties were studied by photoluminescence（PL） and photoluminescence excitation（PLE） spectra. In addition, the temperature-dependent PL measurement was also carried out. The phosphor showed a broad and strong blue emission centered at 428 nm under near ultraviolet light excitation at 370 nm. Ce^（3＋） ions in the three Ca sites of the host showed the similar centroid shift（εc） and crystal field splitting（εcfs）. The quantum efficiency of the phosphor with optimal doping concentration was 68% of that of commercial blue phosphor BaMgAl_（10）O_（17）：Eu^（2＋）. It indicated the promising applicability as a blue-emitting phosphor for UV-converting white light-emitting diodes.A blue-emitting phosphor KCa_4（BO_3）_3 doped with Ce^（3＋） was prepared by solid state reaction. Its phase purity and synthesis temperature were investigated by powder X-ray diffraction（XRD）. The optical properties were studied by photoluminescence（PL） and photoluminescence excitation（PLE） spectra. In addition, the temperature-dependent PL measurement was also carried out. The phosphor showed a broad and strong blue emission centered at 428 nm under near ultraviolet light excitation at 370 nm. Ce^（3＋） ions in the three Ca sites of the host showed the similar centroid shift（εc） and crystal field splitting（εcfs）. The quantum efficiency of the phosphor with optimal doping concentration was 68% of that of commercial blue phosphor BaMgAl_（10）O_（17）：Eu^（2＋）. It indicated the promising applicability as a blue-emitting phosphor for UV-converting white light-emitting diodes.

关 键 词：optical materials luminescence light-emitting diodes BORATE rare earths 

分 类 号：TQ422[化学工程] TN312.8[电子电信—物理电子学]