快速合成宽带激发、窄带发射白光LED用Li_2CaSiO_4∶Eu^(2+)蓝-绿荧光粉  

Rapid Synthesis of Broadband Excitation-Narrowband Emission Bluish Green Phosphors Li_2CaSiO_4∶Eu^(2+) for White LED

作　　者：宋金壮[1] 刘伟[1] 李灏[1] 赵文新[1] 田雪英[1] 闫景辉[1] 

机构地区：[1]长春理工大学化学与环境工程学院,长春130022

出　　处：《无机化学学报》2011年第6期1160-1164,共5页Chinese Journal of Inorganic Chemistry

基　　金：2009年吉林省教育厅重大科技支撑项目(No.2009JYT19)资助

摘　　要：采用微波辅助法合成了蓝-绿色荧光粉Li2CaSiO4∶Eu2+,该荧光粉能很好的与紫外光及蓝光LED匹配。分别采用X射线衍射(XRD)、扫描电镜(SEM)和激发-发射光谱(PLE/PL)对样品进行了表征。X射线衍射数据与标准卡片PDF#27-290很好吻合。扫描电镜测试表明样品粒径在2~5μm。在紫外光和蓝光激发下,Li2CaSiO4∶1%Eu2+发射主峰位于478 nm,对应于Eu2+的t2g→8S7/2电子跃迁,半高峰宽31 nm。样品发光性能与Eu2+掺杂浓度有关,且Eu2+的最佳掺杂浓度为1%。合成的样品色坐标为(0.09,0.24),可作为白光LED用蓝-绿色荧光材料。Eu^2＋-doped Li2CaSiO4 bluish green phosphors matched well with UV and blue LED were prepared by the microwave assited method.The synthesized products were characterized by XRD、SEM and PLE/PL spectroscopy.The results of XRD matched well with PDF#27-290.SEM images showed that the products had a diameter from 2 to 5 μm.When excited by ultraviolet and blue light,the main emission peak of Li2CaSiO4∶1%Eu^2＋ located at 478 nm corresponding to the t2g→8S7/2 transition of Eu^2＋,and peak width at half height was 31 nm.The luminescent properties were investigated as a function of activator（Eu^2＋）concentration and the critical concentration was found to be 1%.The color coordination of Li2CaSiO4∶1%Eu^2＋ was（0.09,0.24）,so they were suitable as bluish green phosphors for white LEDs due to their excellent excitation profile and chromaticity.

关 键 词：微波法 白光LED Li2CaSiO4∶Eu2+ 

分 类 号：O614.338[理学—无机化学]