Flux-adjusted phase transformation from Ca_2SiO_4 to Ca_3Si_2O_7 with Eu^(2+) activator for white light emitting diodes  

作　　者：田华 宋俊 陆启飞 王达健 

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

出　　处：《Optoelectronics Letters》2012年第5期352-355,共4页光电子快报（英文版）

基　　金：supported by the National Natural Science Foundation of China (Nos.50872091,21076161 and 50802062);the Tianjin Municipal Science/Technology Commission (Nos.10SYSYJC28100 and 2006ZD30);the Tianjin Municipal Higher Education Commission (No.20110304)

摘　　要：Eu2+ -activated reddish-orange-emitting Ca3Si2O7 phosphors were synthesized with the addition of NH4Cl flux.When the phosphors were synthesized in a nominal composition of (Ca0.99Eu0.01)3Si2O7 without flux addition,a Ca3Si2O7 phase responsible for reddish-orange emission was identified to coexist with an intermediate phase of a-Ca2SiO4 for green emission.With the addition of NH4Cl flux,a-Ca2SiO4 was suppressed while the pure phase Ca3Si2O7 was obtained as the flux content was 3 wt%.Through varying the amount of flux,the emission color of samples can be tuned from green to reddish-orange,corresponding to the phase transformation from a-Ca2SiO4 to Ca3Si2O7.Through optimizing the doping concentration of Eu2+ ,the optimized photoluminescence (PL) properties for reddish-orange emission can be achieved,which makes this kind of phosphor prospective in the applications of the phosphor-converted white light emitting diodes (PC-WLEDs).

关 键 词：EUROPIUM Light emission Light emitting diodes Optimization Phase transitions PHOSPHORS Silicon 

分 类 号：TN312.8[电子电信—物理电子学] TQ424.1[化学工程]