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《CHINESE JOURNAL OF LUMINESCENCE》 1994-03
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THE INVESTIGATION OF SEMICONDUCTOR CONTACT IN ORGANIC ELECTROLUMINESCENT DEVICE WITH PHOTOVOLTAIC METHOD

Liu Zugang; Zhang Zhilin; Shen Yue; Zhao Weiming; Jiang Xueyin; Xu Shaohong (Department of Material Science, Shanghai Shanghai University of Science and Technology, Shanghai 201800)  
hotovoltaic properties of single and double layer structural organic thin film electroluminescent devices have been firstly reported. The polarity of photovoltaic indicated that the photovoltaic effect was Schottky effect. And different semiconductor contactsbetween different organic semiconductors or organic materials and electrodes of the devices have been given by analysing the action spectra of pbotocurrent of devices. In thesingle layer device(ITO/Alq3/Al),the photocurrent was generated from Alq3/Al interface, which implied that there was a Schottky barrier here. For double layer device (ITO/diamine/Alq3/Al), the photocurrent was generated from both Alq3/Al and diamine/Alq3 interfaces. This comfirmed that a p-n junction exists at the interface of diamine/Alq3, which had been assumed in prior paper. It is the p-n junction that confines the carriers and the excitons in a narrow luminessent layer and increases the EL efficiency and brightness in double layer device. Energy band models were proposed to explain the photovoltaic behaviors and the EL charactoristics of the devices.
【Fund】: 国家自然科学基金 上海市高教局青年基金
【CateGory Index】: TB43
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