Solution‐Processable Hole‐Generation Layer and Electron‐Transporting Layer: Towards High‐Performance,Alternating‐Current‐Driven,Field‐Induced Polymer Electroluminescent Devices |
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Authors: | Yonghua Chen Yingdong Xia Gregory M Smith Hengda Sun Dezhi Yang Dongge Ma Yuan Li Wenxiao Huang David L Carroll |
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Affiliation: | 1. Center for Nanotechnology and Molecular Materials, Department of Physics, Wake Forest University, Winston‐Salem, NC, USA;2. State Key Laboratory of Polymer Physics and Chemistry, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, Changchun, P. R. China |
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Abstract: | The effect of solution‐processed p‐type doping of hole‐generation layers (HGLs) and electron‐transporting layer (ETLs) are systematically investigated on the performance of solution‐processable alternating current (AC) field‐induced polymer EL (FIPEL) devices in terms of hole‐generation capability of HGLs and electron‐transporting characteristics of ETLs. A variety of p‐type doping conjugated polymers and a series of solution‐processed electron‐transporting small molecules are employed. It is found that the free hole density in p‐type doping HGLs and electron mobility of solution‐processed ETLs are directly related to the device performance, and that the hole‐transporting characteristics of ETLs also play an important role since holes need to be injected from electrode through ETLs to refill the depleted HGLs in the positive half of the AC cycle. As a result, the best FIPEL device exhibits exceptional performance: a low turn‐on voltage of 12 V, a maximum luminance of 20 500 cd m?2, a maximum current and power efficiency of 110.7 cd A?1 and 29.3 lm W?1. To the best of the authors' knowledge, this is the highest report to date among FIPEL devices driven by AC voltage. |
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Keywords: | solution‐processable hole‐generation layer electron‐transporting layer alternating‐current‐driven field‐induced electroluminescence |
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