红色长余辉发光材料Ca_2Zn_4Ti_(15)O_(36)∶Pr^(3+)的合成和发光性质  

Synthesis and Luminescent Properties of Novel Red Long-Lasting Phosphor Ca_2Zn_4Ti_(15)O_(36)∶Pr^(3+)

作　　者：李秀英[1] 廉世勋[1] 刘利民[1] 朱爱玲[1] 李承志[1] 张华京[1] 尹笃林[1] 

机构地区：[1]湖南师范大学化学化工学院化学生物学及中药分析省部共建教育部重点实验室,湖南长沙410081

出　　处：《中国稀土学报》2005年第1期16-20,共5页Journal of the Chinese Society of Rare Earths

基　　金：国家自然科学基金资助项目(20371017)

摘　　要：分别采用高温固相法和溶胶 凝胶法合成了新型红色长余辉发光材料Ca2Zn4Ti15O36∶Pr。高温固相法合成Ca2Zn4Ti15O36需要在1200℃灼烧96h才能形成纯物相。热重分析曲线和X射线衍射分析结果表明:溶胶 凝胶法制得的前驱体在700℃灼烧12h开始形成Ca2Zn4Ti15O36物相;在1000℃灼烧24h得到Ca2Zn4Ti15O36纯物相;最佳反应温度为1000℃,激活剂Pr3+的最佳浓度为0.6mol%,发光强度比高温固相法增强了510%。A novel red long-lasting phosphor Ca_2Zn_4Ti_(15)O_(36)∶Pr were synthesized by solid state reaction and by sol-gel method. It is a new type of Pr^(3+)-doped titanate red long lasting phosphor. It is difficult to make pure Ca_2Zn_4Ti_(15)O_(36) crystalline by solid state reaction and it must be sintered at 1200 ℃ for 96 h. The analysis results of thermogravimetric curve and X-ray powder diffraction revealed that Ca_2Zn_4Ti_(15)O_(36) can be formed by sintering precursor at 700 ℃ for 12 h, and very pure Ca_2Zn_4Ti_(15)O_(36) crystalline only formed when sintering precursor at 1000 ℃ for 24 h. A maximum of red emission intensity at 618 nm is observed for a Pr^(3+) molar percentage of 0.6% when the polymer precursor sintered at 1000 ℃ for 24 h. The intensity of red emission of Pr^(3+) in Ca_2Zn_4Ti_(15)O_(36) depends strongly on the preparation method. Comparing the red emission intensity of samples made by sol-gel method, with by solid state reaction the former increases about 510%.

关 键 词：Ca2Zn4Ti15O36 高温固相法 溶胶-凝胶法 红色长余辉 稀土 

分 类 号：O482.3[理学—固体物理]