大尺寸闪烁晶体Ce:LYSO的生长  

Growth of Ce:LYSO Scintillation Crystal with Large Size

作　　者：王佳[1] 岑伟[1] 李和新[1] 蒋春健[1] 石自彬[1] 

机构地区：[1]中国电子科技集团公司第26研究所,重庆400060

出　　处：《压电与声光》2013年第3期401-403,407,共4页Piezoelectrics & Acoustooptics

基　　金：重庆市科学技术委员会基金资助项目(CSTC;2010AA4038)

摘　　要：采用提拉法生长Ce∶LYSO闪烁晶体。通过研究晶体开裂及产生过冷的机理,优化温场结构设计,解决了这两种现象之间的矛盾,实现了大尺寸Ce∶LYSO晶体的生长,晶体尺寸达到60mm×280mm。先后生长不同掺杂浓度的Ce∶LYSO晶体,并根据相应的测试结果确定了合适的掺杂比例,进一步明确不同通气方式对晶体性能的影响。结果表明,Ce掺杂浓度达到0.15%时,发光强度最大,晶体内部无明显缺陷。晶体在抽真空充流动氮气条件下生长,有利于提高晶体的透过率,对相对发光强度的影响不大。The cerium-doped lutetium-yttrium oxyortho-silicate （Ce ： LYSO） crystals were grown by the Czo- chralski method. The temperature field was designed according to the mechanisms of crystal crack and super-cool- ing, and optimized by experiments. Then the large size of Ф60 mm× 280 mm Ce ： LYSO crystal was realized. The Ce： LYSO crystals with different cerium concentrations were grown, and the congruent cerium-doped concentration was demonstrated by the scintillation properties measurement. The effects of different protection gases on the crys- tal performance were also discussed. The result showed that when the Ce concentration was 0. 15%, Ce ： LYSO had the best light output with no obvious defects. The mode of using N2 flow after vaccumizing was helpful for crys- tal transmittance improvement, but having less influence on light output.

关 键 词：CE LYSO 提拉法 大尺寸 原料配比 通气方式 

分 类 号：TN384[电子电信—物理电子学]