Direct white-light from core-shell-like sphere with Sr_3MgSi_2O_8:Eu^(2+),Mn^(2+) coated on Sr_2SiO_4:Eu^(2+)  

作　　者：李建 邓家春 陆启飞 王达健 

机构地区：[1]Key Lab. of Display Materials & Photoelectronic Devices,Ministry of Education,Tianjin University of Technology [2]School of Science,Tianjin University of Technology [3]Institute of Materials Physics,Tianjin University of Technology

出　　处：《Optoelectronics Letters》2013年第4期293-296,共4页光电子快报（英文版）

基　　金：the National Natural Science Foundation of China (Nos.21076161, 50802062 and 50872091)

摘　　要：A method of color mixture for white light is presented with Sr3MgSi2O8:Eu2+, Mn2+ shell coated on Sr2SiO4:Eu2+ core by spray pyrolysis procedure. Upon near ultraviolet (NUV) excitation, a 550 nm band emission of Eu2+ from core host combines with the simultaneous emissions of Eu2+ at 457 nm and Mn2+ at 683 nm based on energy transfer in the shell lattice to generate warm white light with color rendering index (CRI) of 91. With such a core-shell-like structure, the re-absorption of blue light from shell layer can be effectively suppressed, and the chemical stability of the phosphor is verified experimentally to be superior to that of the Sr2SiO4:Eu2+. This new proposed phosphor provides great potential in the color mixture of blending-free phosphor converted white NUV light emitting diode (LED) devices.A method of color mixture for white light is presented with Sr3MgSi2O8：Eu2＋, Mn2＋ shell coated on Sr2SiO4：Eu2＋ core by spray pyrolysis procedure. Upon near ultraviolet （NUV） excitation, a 550 nm band emission of Eu2＋ from core host combines with the simultaneous emissions of Eu2＋ at 457 nm and Mn2＋ at 683 nm based on energy transfer in the shell lattice to generate warm white light with color rendering index （CRI） of 91. With such a core-shell-like structure, the re-absorption of blue light from shell layer can be effectively suppressed, and the chemical stability of the phosphor is verified experimentally to be superior to that of the Sr2SiO4：Eu2＋. This new proposed phosphor provides great potential in the color mixture of blending-free phosphor converted white NUV light emitting diode （LED） devices.

关 键 词：白光 球体 涂层 锰 热分解过程 化学稳定性 发光二极管 显色指数 

分 类 号：TN104.3[电子电信—物理电子学]