Ca_3 Y_2(Si_3O_9)_2:Tb^(3+)绿色荧光粉的光谱特性  

Spectral characteristics of green emitting phosphor Ca_3 Y_2(Si_3O_9)_2:Tb^(3+)

作　　者：节喜 宋会玲[1] 赵嘉伟[1] 段新彦 张月冬 杨宝柱[1] 王志军[1] 李盼来[1] 张子才[1] 庞立斌[2] 

机构地区：[1]河北大学物理科学与技术学院,河北省光电信息材料重点实验室,河北保定071002 [2]河北大学外语教学部,河北保定071002

出　　处：《光电子．激光》2015年第1期91-95,共5页Journal of Optoelectronics·Laser

基　　金：国家自然科学基金(50902042);河北省自然科学基金(A2014201035;E2014201037);河北省教育厅基金(ZD2014036;QN2014085)资助项目

摘　　要：采用高温固相法制备了Ca3Y2(Si3O9)2:Tb3+绿色荧光粉,研究了材料的光学性能。X射线衍射(XRD)结果显示,掺杂少量的Tb3+,并未影响Ca3Y2(Si3O9)2材料的晶相结构。Ca3Y2(Si3O9)2:Tb3+荧光粉的激发光谱由较强的4 f75 d1宽带吸收(200~300nm)和较弱的4 f-4 f电子跃迁吸收(300~500nm)构成,主激发峰位于236nm。取波长分别为236、376和482nm的光作为激发源时,发现样品的主发射峰均位于544nm,对应Tb3+的5D4→7F5跃迁发射。以236nm紫外光作为激发源,监测544nm主发射峰,随Tb3+浓度的增大,Ca3Y2(Si3O9)2:Tb3+的荧光寿命逐渐减小,但在实验范围内并未出现浓度猝灭现象。A green emitting phosphor Ca3Y2（Si3O9）2：Tb^3＋ is synthesized by a high temperature solid state method, andinitialmaterials areCaCOa （A. R. ）, Y2O3 （A. R. ）, SiO2 （A. R. ） and Tb4O7 （ 99.99 %）. Phase formation is determined by X-ray diffraction （XRD） in a Bruker AXS I38 advanced automatic diffractometer （Bruker Co. ,German） with Ni-filtered Cu Ka1 radiation （λ= 1. 5406 nm）. Steady time resolved luminescence spectra,and excitation and emission spectra are detected by a fluorescence spectro-photometer （Hitachi F-4600）. Commission International de I＇Eclairage （CIE） chromaticity coordinates of samples are measured by a PMS-80 spectra analysis system. The uniform diffraction patterns indicate that phase formation of Ca3Y2 （Si309）2 is not influenced by a little amount of Tb^3＋. The excitation spectrum of Ca3Y2 （Si3O9）2 ：Tb^3＋ presents an obvious 4 f^75d^1 broadband absorption （200-- 300 nm） and a weak 4f→4f electronic transition absorption （300--500 nm） which corresponds to characteristic excitation of Tba＋ ,and the excitation peak locates at 236 nm. With different excitation wavelengths of 236 nm,376 nm and 482 nm,the emission spectra show the same spectral distribution,and the peak locates at 544 nm （^5D4→^7F5 ）. Temporal decay of Ca3Y2 （Si3O9）2 ： Tb^3＋ as a function of Tb^3＋ concentration is investigated （）,ex =236 nm,Aem = 544 nm）,and decay time of Ca3Y2 （Si3O9）2 ： Tb^3＋ decreases with increasing Tba＋ concentration. However, the concentration quenching effect of Tb^3＋ in Ca3Y2 （Si3O9）2 ： Tb^3＋ is not observed.

关 键 词：发光 TB3+ Ca3Y2(Si3O9)2 

分 类 号：O482.31[理学—固体物理]