利用亮度波形证明固态阴极射线发光  

Proof of Solid State Cathodoluminescence by Using Brightness Waveform

作　　者：刘明[1] 陈晓红[2] 徐征[1] 滕枫[1] 衣立新[1] 高德文[3] 郭立群[3] 

机构地区：[1]北京交通大学光电子技术研究所,北京100044 [2]中国科学院半导体研究所,北京100083 [3]北京石油化工学院,北京102617

出　　处：《光谱学与光谱分析》2005年第10期1556-1559,共4页Spectroscopy and Spectral Analysis

基　　金：国家自然科学基金(90301004);北京自然科学基金(2032015);博士后基金和北京交通大学攀登基金资助项目

摘　　要：制备了3种结构的器件:A:ITO/SiO2/Alq3/Al,B:ITO/Alq3/SiO2/Al,C:ITO/SiO2/Alq3/SiO2/Al。对于器件A和B,在正向偏压(ITO接正极)下才能观察到发光;而对于器件C,在正向和反向偏压下都可以观察到发光。随着电压升高,器件B和C产生的蓝色发光相对绿光逐渐增强。这主要是由于SiO2中的加速电子碰撞激发Alq3发光层产生热电子,并与空穴形成电子空穴对,复合产生蓝光;而对于器件A,在反向偏压下被热电子碰撞激发出的空穴与正向偏压下从Al电极进入的电子复合形成激子,产生绿色发光。这些结构的器件发光不但可来源于电子与积累的空穴复合,而且也来自固态阴极射线发光。Three different inorganic-organic hetero-junctions （A ： ITO/SiO2/Alq3/Al, B ： ITO/Alq3/SiO2/Al and C： ITO/SiO2/Alq3 / SiO2/Al ） were fabricated. The emission can be observed only under positive bias in devices A and B, but under both biases in device C according to their brightness waveforms. With increasing voltage, the increase in blue emission in devices B and C is faster than that in green emission. This is because that the recombination of hot electrons and boles, i.e., electron-hole pairs, produced blue emission in devices B and C, and the recombination of electrons injected from AI with the accumulated holes, which are excited by hot electrons, produced green emission in device A. Hence, the emissions of the devices are attributed to not only the recombination of electrons and accumulated holes, but also the cathodoluminescence-like （CL-like） emission.

关 键 词：固态阴极射线发光 热电子 电子空穴对 有机无机异质结 八羟基喹啉铝 

分 类 号：TN383.1[电子电信—物理电子学]