有机半导体电致发光器件中的焦耳热效应和有机物热分解  

Joule Heating Effect and Organic Decomposition in O rganic Light-Emitting Diodes

作　　者：周美娟[1] 钟高余[1] 何钧[1] 廖良生[1] 侯晓远[1] 

机构地区：[1]复旦大学应用表面物理国家重点实验室,上海200433

出　　处：《Journal of Semiconductors》2001年第8期1048-1051,共4页半导体学报（英文版）

基　　金：国家自然科学基金资助项目 (批准号 :697760 3 4 )

摘　　要：采用显微观察的方法证明有机半导体电致发光器件处于工作状态时产生的焦耳热 ,不仅使有机物发生结晶现象 ,还使器件产生气体并向外逸出 ,气体集聚在金属电极 /有机层界面 ,从而形成表面气泡 .质谱、色谱分析表明 ,逸出气体的成分除了大量的水汽之外 ,还存在有机杂质气体和有机物分解气体 .在以 8-羟基喹啉铝 (Alq3)为发光层的器件中 ,当受热温度达到 15 0℃时 ,有机分子会发生分解 ,逸出 8-羟基喹啉气体 .紫外光电子能谱分析进一步证实 ,Alq3薄膜的受热温度达到 15 0℃时 ,其电子结构发生明显变化 。Microscopy observation proves that the Joule heating,pr od uced during the electrical operation of organic light-emitting diodes in the mi crometer areas can result in not only the crystallization of organic layers,but also the evolution of gases from the device.The gases gather at metal electrode/ organic layer to form bubbles.From mass spectra and gas chromatograph,it is indi cated that the evolved gases consist of not only moisture,but also organic impur ity gases and organic decomposed gases.For the devices with tris-(8-hydroxyquinoline) a luminum (Alq 3) as emitting layer,some Alq 3 molecules are decomposed and 8-h ydroxyquinoline gas is produced at 150℃.Ultraviolet photoelectron spectra show that the electronic structure of Alq 3 varies obviously after annealing at 150 ℃ for 5min.The change in the energy band structure of Alq 3 film will deterior ate the performance of devices.

关 键 词：有机半导体 焦耳热效应 有机物热分解 电致发光器件 

分 类 号：TN383.1[电子电信—物理电子学]