Highly improved light extraction with a reduced spectrum distortion of organic light-emitting diodes composed by the sub-visible wavelength nano-scale periodic (～250 nm) structure and micro-lens array |
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| Affiliation: | 1. Display and Nanosystem Laboratory, College of Engineering, Korea University, Seoul 136-713, Republic of Korea;2. Samsung Display Co., Ltd., Tangjeong-Myeon, Asan-City, Chungcheongnam-Do, Republic of Korea;3. The Institute of High Technology Materials and Devices, Korea University, Seoul 136-713, Republic of Korea;1. Dept. of Information Display, Kyung Hee University, Seoul 02447, Republic of Korea;2. Soft I/O Interface Research Section, Electronics and Telecommunications Research Institute, Daejeon 34129, Republic of Korea;1. School of Electrical Engineering, Korea Advanced Institute of Science and Technology (KAIST), 291 Daehak-ro, Yuseong-gu, Daejeon, Republic of Korea;2. Reality Device Research Division, ICT Materials & Components Research Laboratory, Electronics and Telecommunications Research Institute (ETRI), 218 Gajeong-ro, Yuseong-gu, Daejeon, Republic of Korea;1. School of Applied Chemical Engineering, Department of Polymer Science and Engineering, Polymeric Nanomaterials Laboratory, Kyungpook National University, Daegu 41566, Republic of Korea;2. Department of Sensor & Display Engineering, Kyungpook National University, Daegu 702-701, Republic of Korea;1. Department of Creative Convergence Engineering, Hanbat National University, Daejeon, 34158, South Korea;2. Research Institute of Printed Electronics & 3D Printing, Hanbat National University, Daejeon, 34158, South Korea;1. Institute of Functional Nano & Soft Materials (FUNSOM), Jiangsu Key Laboratory for Carbon-Based Functional Materials & Devices, Soochow University, 199 Ren''ai Road, Suzhou, 215123, Jiangsu, PR China;2. Macao Institute of Materials Science and Engineering (MIMSE), MUST-SUDA Joint Research Center for Advanced Functional Materials, Zhuhai MUST Science and Technology Research Institute, Macau University of Science and Technology, Taipa 999078, Macau, China |
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| Abstract: | Out-coupling enhanced organic light-emitting diodes (OLEDs) with micro-lens arrays and a nano-scale periodic light-extraction structure—a photonic crystal (PC)—utilizing laser interference lithography (LIL) are demonstrated. Generally, PC-based OLEDs suffer from a distorted and shifted spectrum, despite a highly improved intensity. However, in this study, we demonstrate PC-based OLEDs with a distortion-free spectrum and a highly improved out-coupling performance. It was found that spectrum distortion decreased with the pitch size of the PC. The PC-based OLED with a 250 nm pitch size showed a dramatically reduced spectral shift: International Commission on Illumination 1931 color coordinate of (Δ0.00, Δ0.00) and Δpeak wavelength of 0 nm as compared with the reference. Simultaneously, the external quantum efficiency and the power efficiency were enhanced by up to 178% and 264%, respectively, as compared with the reference. Moreover, through the LIL, simple and maskless processes were achieved for a light-extraction structure over a large area. |
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| Keywords: | Laser interference lithography (LIL) Organic light-emitting diodes (OLEDs) Nano-scale periodic pattern Out-coupling Micro-lens arrays Photonic crystal |
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