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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 ,由此可严重影响器件性能
The microscopic observation proved that the Joule heat generated by the organic semiconductor electroluminescent device is not only causing the crystallization of the organic substance but also causing the device to generate gas and escape outward. The gas collects at the metal electrode / organic layer interface, Thereby forming surface bubbles.Mass spectroscopy and chromatographic analysis showed that the components of the escaped gas, besides a large amount of water vapor, also exist organic impurity gases and organic decomposition gases.In the device with aluminum oxychloride (Alq3) as the light emitting layer , When the heating temperature reaches 15 0 ℃, the organic molecules will decompose and escape the 8-hydroxyquinoline gas.Ultraviolet photoelectron spectroscopy analysis further confirmed that the electronic structure of Alq3 thin film when the temperature reached 15 0 ℃, the electronic structure of significant changes , Which can seriously affect device performance