采用高温固相法制备了Ca3Y2(Si3O9)2:Tb^3+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Tb^3+,并未影响Ca3Y2(Si3O9)2材料的晶相结构。Ca3Y2(Si3O9)2:Tb^3+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4f-4f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Tb^3+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Tb^3+浓度的增大,Ca3Y2(Si3O9)2:Tb^3+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.