不同气氛退火对钨酸铅晶体光学性能的影响  

Influence of Annealing Atmosphere on Luminescence Properties of Lead Tungstate Crystal

作　　者：向卫东[1] 邵明国[1] 顾国瑞 王昕[2] 钟家松[2] 梁晓娟[1] 

机构地区：[1]温州大学化学与材料工程学院,温州325035 [2]杭州电子科技大学材料与环境工程学院,杭州310018

出　　处：《人工晶体学报》2014年第6期1361-1366,共6页Journal of Synthetic Crystals

基　　金：浙江省国际科技合作项目(2008C14088);浙江省重点科技创新团队(2009R50010);浙江省公益技术研究工业项目(2012C31G2040043)

摘　　要：为探究不同气氛退火处理对钨酸铅晶体光学性能的影响,对坩埚下降法生长的钨酸铅晶体分别在氧化气氛(O2)、惰性气氛(N2)、还原气氛(CO)下进行退火处理,测试了退火前后的透射光谱、吸收光谱、荧光光谱、光产额和衰减时间等光学性能参数。结果表明,N2气氛退火后钨酸铅晶体350 nm处的本征吸收略有降低而O2和CO气氛退火后略有增强,富O2气氛下退火的钨酸铅(PWO)晶体在420 nm处产生较强吸收峰。O2、N2气氛退火的钨酸铅晶体荧光光谱出现红移,CO气氛退火的钨酸铅晶体荧光强度得到明显改善,O2、N2、CO不同气氛退火的PWO晶体在1000 ns积分时间内的光产额分别为:10 p.e/MeV、25 p.e/MeV、38 p.e/MeV,衰减时间分别约为5.2 ns、4.5ns、4.4 ns。The influence of different annealing atmosphere on the optical properties of lead tungstate crystal was studied.The PbWO4crystal grown by Bridgman method was annealed in oxidation atmosphere（O2）,inert atmosphere（N2）,reducing atmosphere（CO）.The optical transmittance spectra,absorption spectra,fluorescence spectra,light yield and luminescence decay time were measured before and after annealing.The results show that the intrinsic absorption at 350 nm of PbWO4crystal annealed at inert atmosphere was lowered a bit,however improved a bit when annealed at oxidation and reducing atmosphere,and PbWO4crystal annealed at rich oxygen atmosphere has a strong absorption peak at 420nm.The fluorescence spectra of PbWO4crystal annealed in O2,N2environment present red shift phenomenon,the fluorescence intensity of PbWO4crystal annealed in CO environment was improved obviously.The light yield of PbWO4crystal annealed in O2,N2,CO environment and a gate width of1000 ns can reach 10 p.e/MeV,25 p.e/MeV,38 p.e/MeV,the luminescence decay time was 5.2 ns,4.5 ns and 4.4 ns,respectively.

关 键 词：钨酸铅晶体 坩埚下降法 退火 光学性能 

分 类 号：O781[理学—晶体学]