Highly flexible organic light-emitting diodes based on ZnS/Ag/WO3 multilayer transparent electrodes |
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Authors: | Hyunsu Cho Changhun Yun Jae-Woo Park Seunghyup Yoo |
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Institution: | aSchool of Electrical Engineering and Computer Science, KAIST, 335 Gwahangno, Daejeon 305-701, Republic of Korea |
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Abstract: | We report our study on highly flexible organic light-emitting diodes based on ZnS/Ag/WO3 (ZAW) multilayer transparent electrodes in which high conductivity and ductility of Ag layers allow for efficient sheet conduction and flexibility while ZnS and WO3 layers provide a means for enhancement in optical transmission and/or carrier-injection. Devices with ZAW anodes fabricated on planarized plastic substrates not only exhibit a performance and operational stability comparable to or better than those of ITO-based devices but also show a mechanical flexibility that is far superior to that of ITO-based devices. Experimental results show that a consistent performance can be obtained in ZAW-based devices upon repeated bending down to a radius of curvature of 5 mm, below which the flexibility of the devices is limited ultimately by the delamination occurring at cathode/organic interfaces rather than by the ZAW electrodes themselves. |
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Keywords: | Flexible display Flexible electrode Transparent electrode Tungsten oxide Organic light-emitting diode |
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