荧光粉(Ca(2.94-x)Lux Ce(0.06))(ScMg)Si3O(12)的晶体结构和荧光性质  

Crystal Structure and Luminescence Properties of(Ca_(2.94-x)Lu_xCe_(0.06))(ScMg)Si_3O_(12) Phosphors for White LEDs

作　　者：刘永福[1,2] 张霞[1] 郝振东[1] 王笑军[3] 张家骅[1] 

机构地区：[1]中国科学院激发态重点实验室长春光学精密机械与物理研究所,吉林长春130033 [2]中国科学院研究生院,北京100039 [3]Georgia Southern大学物理学系,Statesboro Georgia 30460

出　　处：《发光学报》2011年第5期445-450,共6页Chinese Journal of Luminescence

基　　金：国家自然科学基金(10834006,10774141,10904141,10904140);国家科技部项目(2006CB601104);吉林省科技发展计划项目(20090134,20090524);中国科学院创新项目资助

摘　　要：利用高温固相反应制备了一种由Lu改进的黄色荧光粉(Ca_(2.94-a)Lu_aCe_(0.06))(ScMg)Si_3O_(12)(缩写为CLSMS:Ce^(3+)),其中,0≤x≤0.94。同时研究了Lu含量对荧光粉的晶相、发光性质以及温度特性的影响。结果表明,Lu的引入导致荧光增强,其原因是由于Ce^(3+)吸收增强而不是荧光粉内量子效率增加。通过控制Lu的摩尔分数可以获得纯的晶相,进一步实现Ce^(3+)的高强度宽带发射。当Lu的摩尔分效x=0.54时,样品的荧光强度达到最大值,其值为不含Lu时荧光强度的156%。同时,含Lu的荧光粉比不含Lu的荧光粉表现出优越的温度特性。将含有Lu的荧光粉和蓝光LED芯片结合,得到显色指数86,流明效率为86lm/W的白光LED。Lu modified（Ca_（2.94-x）Lu_xCe_（0.06））（ScMg）Si_3O_（12）（CLSMS：Ce^（3＋））yellow emitting phosphors are prepared by solid-state reaction.The effects of Lu content on crystal phase formation,luminescence properties and temperature characteristics are studied.It is revealed that the Lu induced luminescent enhancement can be attributed to the increase of absorbance of Ce^（3＋）rather than the internal quantum efficiency.Intense and broadband emission is realized by controlling the Lu content to obtain a pure CLSMS crystal phase.The maximum luminescence intensity is obtained at x=0.54,which is as high as 156%of the Lu free phosphor.Combining the present phosphor with a blue LED chip,a white LED with an excellent color rendering index of 86 and high luminous efficiency of 86 lm？W^（-1）is obtained.

关 键 词：黄色荧光粉 硅酸盐 白光LED 

分 类 号：O482.31[理学—固体物理]