Organic wrinkles embedded in high-index medium as planar internal scattering structures for organic light-emitting diodes |
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| Institution: | 1. Flexible Information Device Research Section, ICT Materials & Components Research Laboratory, Electronics and Telecommunications Research Institute (ETRI), 218 Gajeong-ro, Yuseong-gu, Daejeon, Republic of Korea;2. Department of Electrical Engineering, Korea Advanced Institute of Science and Technology (KAIST), 291 Daehak-ro, Yuseong-gu, Daejeon, Republic of Korea;1. Department of Materials Science and Engineering, Indian Institute of Technology Kanpur, Kanpur 208016, India;2. Samtel Centre for Display Technologies, Kanpur, Kanpur 208016, India;1. Department of Display Engineering, Pukyong National University, Busan 608-737, Republic of Korea;2. OLED Research Center, Electronics and Telecommunications Research Institute (ETRI), Daejeon 305-700, Republic of Korea;3. Department of Materials Science and Engineering, Yonsei University, Seoul 120-749, Republic of Korea;4. Center for Nano-Photonics Convergence Technology, Korea Institute of Industrial Technology, Gwangju 500-480, Republic of Korea;1. Center for Nano-Photonics Convergence Technology, Korea Institute of Industrial Technology (KITECH), Gwangju, 61012, South Korea;2. Department of Electrical Engineering, Princeton University, Princeton, NJ, 08544, United States;3. Department of Electrical Engineering, Mokpo National University, Muan, 58554, South Korea;4. Department of Electrical Energy Engineering, Keimyung University, Daegu, 42601, South Korea;5. Department of Display Engineering, Pukyong National University, Busan, 48513, South Korea |
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| Abstract: | Organic wrinkle structures are investigated as an internal scattering layer for the fabrication of highly efficient organic light-emitting diodes (OLEDs). The solution-processed wrinkle structures are planarized with a high-index layer, resulting in a reduced surface roughness and optical haze simultaneously. The OLED device including the wrinkle structures achieved external quantum efficiency (EQE) of 24.2%, corresponding to a 1.24 time enhancement with respect to that of a control device having no internal scattering layer. By attaching a micro lens array (MLA) or a half ball lens (HBL) on the external surface of the substrate, the proposed device exhibits an EQE of 30.5% (1.56 time enhancement) and 41.8% (2.14 time enhancement), respectively. Randomness of the distributed wrinkle structures is shown to provide additional benefits of reduced angular spectral distortion and Lambertian-like emission properties. Trans-scale optical simulation combining wave-optics and the geometrical effect are used for the quantitative analysis of the emission characteristics of the device. |
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| Keywords: | Organic light-emitting diode Internal scattering Wrinkle Light extraction |
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