(Ca,Sr)S:Eu,Sm的光激励发光和电子俘获机理的研究  

Study of Photostimulated-luminescence and Electron Trapping Mechanism of (Ca,Sr)S:Eu,Sm

作　　者：何志毅[1] 王永生[1] 孙力[1] 徐征[1] 徐叙[1] 

机构地区：[1]北方交通大学光电子技术研究所信息存储显示与材料开放实验室,北京100044

出　　处：《光电子．激光》2003年第7期729-732,共4页Journal of Optoelectronics·Laser

基　　金：国家自然科学基金资助项目(19874001);北方交大论文基金资助项目

摘　　要：研究了CaxSr1-xS:Eu,Sm(x=0～1)的光激励发光和吸收性质,测量了样品的红外光激励谱。发现激发后样品在红外区的吸收增强,增强部分的波长分布与光激励谱相同,峰的位置随组分x值而变化,同时在这些谱带上还发现了一些次级结构。由此说明Sm3+对陷阱的红外激励吸收的影响。据此提出一个复合陷阱模型,指出电子俘获中心并非Sm3+附近形成的晶格缺陷。The optical absorption properties and photostimulated spectra of CaxSr1-xS:Eu,Sm(x=0-1) were studied. The sharp lines of the optical absorption corresponding to the 4f-4f transition of Sm3+ were observed. In disagreement with the model previously reported, the valence of Sm3+ in these materials was found to remain unchanged in electron trapping. The absorption of electron trapping centers to the infrared stimulating light is shielded by Sm3+ due to their spatial correlation. A model of complex trap was proposed, in which the defects produced in the vicinity of Sm3+ due to their valence mismatch with the host cations, instead of Sm3+ as previously reported, act as the electron capturing center.

关 键 词：光激励发光 电子俘获 碱土金属硫化物 SM EU 

分 类 号：TB381[一般工业技术—材料科学与工程]