白光LED用红色荧光粉Gd_2Mo_3O_9∶Eu^(3+)的制备及表征  

Preparation and Properties of Red Emitting Phosphor Gd_2Mo_3O_9∶Eu^(3+)for White LEDs

作　　者：张国有[1] 赵晓霞[2] 孟庆裕[2] 王晓君[2] 

机构地区：[1]内蒙古民族大学物理系,内蒙古通辽028043 [2]中国科学院激发态物理重点实验室

出　　处：《发光学报》2007年第1期57-61,共5页Chinese Journal of Luminescence

基　　金：国家自然科学基金资助项目(50572102;10274083)

摘　　要：利用Na2CO3作为助熔剂,采用高温固相反应方法制备了三价铕离子激活的Gd2Mo3O9红色荧光粉。利用XRD和荧光光谱,研究了助熔剂的量、制备时的温度以及激活剂Eu3+的浓度对荧光粉的晶体结构和发光性能的影响。测试结果表明,这种新型的荧光粉可以被紫外光280nm,近紫外光395nm和蓝光465nm有效激发,发射主峰位于613nm,并且证明Eu3+离子在晶体结构中占据了非反演对称中心的位置。395,465nm的吸收与目前广泛应用的紫外和蓝光LED芯片的输出波长相匹配。因此,这种荧光粉是一种可能应用在白光LED上的红色荧光粉材料。Eu^3 ＋-doped Gd2Mo3O9 was prepared by solid-state reaction route using Na2CO3 as flux and characterized by powder X-ray diffraction. According to X-ray diffraction, this material is belongs to tetragonal system. The effects of flUX content and sintering temperature on the luminescent properties were investigated by emission and excitation spectra. The results showed that flUX content and sintefing temperature have impact effects on the luminescent properties, the optimized flux content and the best sintering temperature is 3% and 800 ℃, respectively. The excitation and emission spectra also show that this phosphor can be effectively excited by C-T band （280 nm）, ultraviolet light 395 nm and blue light 465 nm. The wavelengths at 395 nm and 465 nm are nicely fitting in with the widely applied emission wavelengths of ultraviolet or blue LED chips. Integrated emission intensity of Gd2Mo3O9： Eu is 2 times stronger than that of Y2O2S. Eu^3 ＋ under 395 nm excitation. The Eu^3 ＋ doped Gd2 Mo3O9 phosphor may be a better phosphor candidate for solid-state lighting applications.

关 键 词：Gd2MoO9:Eu 红色荧光粉 白光LED Na2CO3助熔剂 

分 类 号：O482.31[理学—固体物理]