(Y,Bi)AG∶Eu^(3+)红色荧光粉化学共沉淀合成与表征  

Synthesis and Characterization of (Y,Bi)AG∶Eu^(3+) Red Phosphor by Coprecipitation Method

作　　者：黎学明[1] 向星[1] 杨文静[1] 李武林[1] 孔令峰[1] 

机构地区：[1]重庆大学化学化工学院,重庆400044

出　　处：《无机材料学报》2009年第5期1059-1063,共5页Journal of Inorganic Materials

基　　金：国家自然科学基金(10476035);重庆市自然科学基金(2005BA4016)

摘　　要：采用化学共沉淀法合成了Bi3+掺杂的YAG:Eu3+荧光粉,利用DTA-TGA、XRD分析煅烧过程中前驱体的热效应和YAG晶相的形成过程,并通过XRD、SEM、PL表征不同Bi3+含量的YAG:Eu3+荧光粉结构、形貌及光致发光性能.结果表明:前驱体在煅烧温度1000℃及以上时,可形成纯相的YAG晶相;Bi3+对Eu3+具有敏化作用,Bi3+的掺入使YAG:Eu3+荧光粉的光致发光峰强度显著增强,当Bi3+含量为0.0010时,其发光峰强度达到最大值,其后随着Bi3+含量进一步增加,则因浓度猝灭而导致荧光粉发光峰强度降低;掺入Bi3+对YAG:Eu3+荧光粉晶胞参数有一定的影响,但不会改变其晶体结构;Bi3+掺杂的YAG:Eu3+荧光粉均匀、无团聚,呈类球型.Spherical-like （Y,Bi）AG∶Eu3＋ red phosphor powders with good photoluminescence performance were synthesized by chemical coprecipitation method. By using DTA-TGA and XRD, both the thermal decomposition and phase formation of （Y,Bi）AG∶Eu3＋ precursors were investigated in process of calcination. The crystal structures, surface morphology and luminescence properties of the phosphors with different Bi3＋ contents were characterized by means of XRD, SEM and fluorescence spectrometer. The result shows that the pure YAG crystal phase is formed after calcination at 1000℃ or above. The photoluminescence intensity of YAG∶Eu3＋ red phosphor strengthens with increasing Bi3＋ content due to the sensitizing of Bi3＋ to Eu3＋,but decreases by excessive Bi3＋ ions. When the Bi3＋ content is 0.0010, the photoluminescence intensity reaches the highest. Addition of Bi3＋ cannot change the crystal structure of YAG∶Eu3＋ phosphor, which is garnet with a little different lattice parameter. The particles of （Y,Bi）AG∶Eu3＋ red phosphor are spherical-like shapes, narrow size distributions with no aggregation.

关 键 词：荧光粉 石榴石 共沉淀 敏化作用 

分 类 号：O611[理学—无机化学]