不同粒径α-Al_2O_3:C晶态粉体热释光和光释光特性  

Thermoluminescence and optically stimulated luminescence characteristics ofα-Al_2O_3:C crystal powder of different particle size

作　　者：胡克艳[1,2] 李红军[2] 徐军[2] 杨秋红[1] 苏良碧[2] 唐强[3] 

机构地区：[1]上海大学电子信息材料系,上海201800 [2]中国科学院上海硅酸盐研究所,上海201800 [3]中山大学物理系,广州510275

出　　处：《物理学报》2012年第15期482-488,共7页Acta Physica Sinica

基　　金：上海市科学技术委员会(批准号:10ZR1434200);国家自然科学基金(批准号:61177037;10505033);中山大学高校基本科研业务费专项资金(批准号:2010300003161457)资助的课题~~

摘　　要：本文探讨了α-Al_2O_3:C晶态粉体的辐照剂量效应,使用RisφTL/OSI-DA-15型热释光和光释光仪研究其热释光和光释光特性,结果发现,相同粒径的α-Al_2O_3:C晶态粉体具有单一热释光峰,且随着辐照剂量的增加热释光强度不断增加,但热释光峰位置保持不变,符合一级动力学模型;而在相同的辐照剂量和测试条件下,随着α-Al_2O_3:C晶态粉体粒径的减小,其热释光强度先增强后减弱,热释光峰却逐渐增加至趋于稳定,表明粒度为40—60μm的α-Al_2O_3:C晶态粉体具有最佳的热释光效应.同时α-Al_2O_3:C晶态粉体的光释光特性的研究发现,其光释光曲线具有典型的指数衰减特征,粒径对其光释光强度和衰减速率的影响符合浅电子陷阱能级理论.In this work,we first report on the radiation dose effect ofα-Al2O3：C crystal powder.The thermoluminescence（TL） and optically stimulated luminescence（OSL） of the powder are investigated by Ris0TL/OSL-DA-15.The as-grownα-Al2O3：C crystal powder of same particle size shows a single TL peak and the TL intensity increases as irradiation dose increases,but no shift of the position of the TL peak is found,which is consistent with first-order recombination kinetics.And in the same radiation dose and test conditions, with the particle size ofα-Al2O3：C crystal powder decreasing,the TL intensity decreases after first increase and then the TL peak is gradually increases and approaches to a stable value,which shows that theα-Al2O3：C crystal powder,40—60μm in diameter,has the best TL effect.The OSL decay curve ofα-Al2O3：C crystal powder shows the typical exponential decay characteristics,and the relationship between OSL intensity and decay rate with the particle size ofα-Al2O3：C crystal powder is found to be consistent with the shallow-electronic-trap theory.

关 键 词：α-Al2O3:C晶态粉体 粒径 热释光 光释光 

分 类 号：TB383.3[一般工业技术—材料科学与工程]