(La,Ce,Tb)PO_4的合成及应用特性研究  

Synthesis of(La,Ce,Tb)PO_4 Phosphors and Its Properties of Application

作　　者：袁剑辉[1] 王修琼[2] 张振华[1] 

机构地区：[1]长沙理工大学物理与电子科学系 [2]中南大学土木建筑学院,湖南长沙410075

出　　处：《稀有金属》2005年第6期875-879,共5页Chinese Journal of Rare Metals

基　　金：湖南省自然科学基金项目(03JJY3013);湖南省教育厅科研计划项目(05C265)资助

摘　　要：为改进(La,Ce,Tb)PO4应用特性,采用溶胶沉淀法、增加低温预烧和复烧工艺及采用助熔剂Li2B2O4等方法合成了高效磷酸盐绿色荧光粉(La0.5Ce0.3Tb0.2)PO4,其发光亮度、温度特性和热稳定性均已达到日本(La,Ce,Tb)PO4商用样品标准;平均中心粒径D50仅为4.2μm,且粒度分布状态良好.对其光谱特性和实验结果进行了分析.实验发现:其最佳工艺条件为温度1000℃,时间1.5h,助熔剂选用0.2～0.25mol Li2B2O4.同时,通过适当降低组分Ce3+的引入量,增加低温复烧并引入H3BO3等方法,可有效改善其温度特性,提高热稳定性.In order to improve the properties for application of （La, Ce, Tb） PO4, the high-efficientcy and small particle size green-emitting phosphors （La, Ce, Tb） PO4 were synthesized by using the sol-sedimentation, Li2B2O4 as flux and adding pre-burning and postburning process at lower temperature. Their luminous brightness, the temperature properties and the heat stability are all same as the commercial sample of （La, Ce, Tb）PO4 phosphor from Japan. The average particle diameter D50 is only 4.2μm and the granularity distribution is also good. Their spectroscopic characteristics and the experiment results are analyzed. The best technology conditions are that the optimum reaction temper ature and time and Li2B2O4 flux amount are 1000 ℃, 1.5 h and 0.2 - 0.25 mol respectively. The temperature properties and the heat stability can be improved effectively by reducing the concentration of the Ce^3＋ ions in the composition of （La, Ce, Tb） PO4, adding the post-burning process and introducing H3BO3 into the phosphor material at lower temperature.

关 键 词：溶胶沉淀法 (La Ce Tb)PO4 发光效率 应用特性 稀土 

分 类 号：O482.31[理学—固体物理]