ZnSe为发光层的蓝绿光薄膜电致发光器件的发光性能  

Luminescence Characteristics of a Blue-Green Emission Thin Film Electroluminescence Device Based on a ZnSe Emitting Layer

作　　者：姜薇薇[1] 赵谡玲[1] 张福俊[1] 徐征[1] 

机构地区：[1]北京交通大学光电子技术研究所

出　　处：《Journal of Semiconductors》2008年第4期754-756,共3页半导体学报（英文版）

基　　金：国家高技术研究发展计划(批准号:2006AA03Z0412);国家自然科学基金(批准号:60576016;10434030);北京市自然科学基金(批准号:2073030);国家重点基础研究发展规划(批准号:2003CB314707)资助项目~~

摘　　要：采用具有电子加速能力的SiO2代替传统夹层结构中的绝缘层,利用电子束蒸发的方法制备了结构为ITO/SiO2/ZnSe/SiO2/Al的电致发光器件,观察到了传统夹层结构所没有的ZnSe层电致发光.测量了器件的电致发光光谱及总发光强度随着驱动电压及驱动频率的变化关系.讨论了器件的发光机理,认为是初电子经过SiO2层加速,获得较高能量,然后碰撞ZnSe分子,将其价带的电子激发到导带,再跃迁回价带或缺陷能级与空穴复合发光.由于这种发光方式类似于阴极射线发光,只不过电子在固体中而不是真空中加速,所以称之为固态阴极射线发光.这种机理为实现蓝色电致发光提供了新的途径.A device with a ITO/SiO2/ZnSe/SiO2/Al structure was deposited by electron beam evaporation. Blue-green electroluminescence of ZnSe film, which does not appear in the traditional sandwich structure,was observed. The dependence of emission on applied voltage and frequency were studied in detail. The luminescence mechanism of the device was discussed. It is thought that original electrons are accelerated in the SiO2 layer where they obtain energy and bombard the ZnSe molecules. The electrons in the valence band of the ZnSe are excited to the conduction band. The excited electrons transit back to the valance band or the defect energy level and give emission. This mechanism is called solid state cathodoluminescence because the electrons accelerate in the solid but not in the vacuum. This phenomenon can provide a new way to realize blue inorganic electroluminescence.

关 键 词：ZNSE 蓝色发光 电致发光 固态阴极射线发光 

分 类 号：O484.41[理学—固体物理]