新型固态照明用发光材料Ca_3SiO_4Br_2∶Eu^(2+)的合成、结构与发光性能  

Synthesis and Analysis of Novel Solid State Lighting Compound Ca_3SiO_4Br_2∶Eu^(2+)

作　　者：夏志国[1] 孙家跃[2] 李国武[1] 熊明[1] 杜海燕[2] 

机构地区：[1]中国地质大学(北京)材料科学与工程学院,北京100083 [2]北京工商大学化学与环境工程学院,北京100048

出　　处：《发光学报》2011年第10期988-992,共5页Chinese Journal of Luminescence

基　　金：国家自然科学基金(51002146);教育部博士点新教师基金(20090022120002);中央高校基本科研业务费专项基金(2010ZY35;2011YXL005);中国科学院长春应化所稀土资源利用国家重点实验室开放基金(RERU2011014)资助项目

摘　　要：制备了一种Eu2+掺杂的新型Ca3SiO4Br2蓝色发光材料,详细研究了其晶体结构组成。采用助熔剂法生长出Ca3SiO4Br2片状单晶,解析并证实该晶体为Ca3SiO4Br2,其结构基元中存在交替排列的Ca2SiO4和CaBr2层。荧光光谱测试表明:Ca3 SiO4 Br2∶Eu2+材料可被近紫外光(300～430 nm)有效激发,产生较强的蓝光发射,发射主峰位于470 nm左右,样品的紫外-可见(UV-Vis)光谱进一步证实了其有效吸收近紫外光的特征。研究表明,卤硅酸盐基质的Ca3SiO4Br2∶Eu2+材料是一种优良白光LED用蓝色荧光粉。Novel blue-emitting material,Eu2＋-doped Ca3SiO4Br2 was reported in this paper.Flaky crystals of Ca3SiO4Br2 were grown out of high-temperature Ca2SiO4/CaBr2 melts.The crystal structure was determined as the chemical composition of Ca3SiO4Br2,and structural investigations have also shown that Ca3SiO4Br2 is composed of the layers of calcium chloride and dicalcium silicate.Based on the photoluminescence analysis,Ca3SiO4Br2∶Eu2＋ phosphor exhibited a broad blue emission band of main peak at 470 nm under the near ultraviolet（n-UV） light（300～450 nm）,and efficient n-UV absorption property can be testified by UV-Vis diffuse reflectance spectra.It indicated that halosilicate materials Ca3SiO4Br2∶Eu2＋ phosphor is an excellent phosphor in the application of the white LEDs.

关 键 词：白光LED照明 蓝色荧光粉 卤硅酸盐 晶体结构 稀土发光 

分 类 号：O482.31[理学—固体物理]