(Zn,Cd)S∶Cu,Cl发光材料的热释发光  

Thermoluminescence of (Zn,Cd)S∶Cu,Cl Luminescent Material

作　　者：李志强[1] 田少华[1] 宋伟朋[1] 韦志仁[1] 董国义[1] 窦军红 

机构地区：[1]河北大学物理科学与技术学院,河北保定071002

出　　处：《发光学报》2005年第3期316-320,共5页Chinese Journal of Luminescence

基　　金：河北省自然科学基金资助项目(502123)

摘　　要：在ZnS中分别掺杂质量分数为5%、7%、10%、15%、20%的CdS,得到一系列(Zn,Cd)S∶Cu,Cl粉末电致发光材料样品。测量样品材料的热释发光曲线,发现五个样品在温度-180～-20℃范围内均有两个明显的热释发光峰。CdS含量的变化对材料中陷阱的种类和陷阱深度没有明显的影响,两个峰值温度在-150℃和-50℃附近。Cd离子的掺入改变了材料较深陷阱中载流子的浓度,随着CdS量的增加,使得在-50℃的热释发光峰的相对强度增大。通过测量样品的发光光谱和发光亮度,发现随着CdS含量的增加,样品材料的发射光谱向长波方向移动,发光亮度呈下降的趋势。The direct bandgap semiconductor compound ZnS and CdS were used as multiple based material. The luminescent characteristic were changed by multibase. (Zn,Cd)S∶Cu,Cl electroluminescent material specimens were prepared by adding 5%, 7%, 10%, 15%, 20% CdS in ZnS respectively.There were two obvious thermoluminescence peaks from -180 ℃ to -20 ℃ in the thermoluminescence curves of the five specimens. The concentration of CdS did not influence the category and the depth of the traps in the material, the temperature of peaks are -150 ℃ and -50 ℃. The concentration of CdS did not change the relative intensity of the thermoluminescence peak at -150 ℃ obviously, the relative intensity were 55.6,46.7,60.2,65.0 and 66.5 respectively, but changed the relative intensity of the thermoluminescence peak at -50 ℃.The relative intensity increased with the concentration of CdS increased. When the Cd^(2+) concentration was 5%, the peak of the curve was 7.1, when the Cd^(2+) concentration was 7%, the peak of the curve was 13.4. When the Cd^(2+) concentration was 10%, the peak of the curve was 32.4. When the Cd^(2+) concentration was 15%, the peak of the curve increased to 82.2 quickly and when the Cd^(2+) concentration was 20%, the peak of the curve forther increased to 97.6. The luminescence spectra of specimens moved from shortwave to longwave and the brightness descended as the concentration of CdS increased as shown by the measuring results of (luminescence) spectra and brightness. We therefore analyzed the result that excessive Cd^(2+) caused the decline of luminance because the replacement of Zn^(2+) by Cd^(2+) in the crystal lattice introduced the defects, and sequently the defects caused the formation of radiationless center. The energy of trapped electrons by the radiationless recombination center turns into the radiationless transition, the α phase which is disadvantageous to luminescence increases when the Cd^(2+) replaces the Zn^(2+) in the crystal lattice synchronously. The Cd^(2+) replaces the Zn^(2+) in th

关 键 词：电致发光 热释光 发光光谱 发光亮度 

分 类 号：O482.31[理学—固体物理]