Recombination zone in white organic light emitting diodes with blue and orange emitting layers |
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| Affiliation: | 1. Faculty of Engineering, Kyoto Sangyo University, Kamigamo, Kita-ku, Kyoto 603-8555, Japan;2. Research Institute for Advanced Liquid Crystal Technology, Hachinohe, Aomori 039-2245, Japan;3. Tohoku Device Co., Ltd., Hanamaki, Iwate 025-0312, Japan;1. State Key Laboratory of Fine Chemicals, School of Chemistry, Dalian University of Technology, 2 Linggong Road, Dalian, 116024, China;2. School of Chemistry and Material Engineering, Anhui Science and Technology University, Fengyang, Anhui, 233100, China;1. LPSMS, FST Errachidia, B.P. 509, Boutalamine, Errachidia, Université My Ismail, Morocco;2. XLIM UMR 7252 – Université de Limoges/CNRS, 123 avenue Albert Thomas, 87060 Limoges Cedex, France;1. Department of Information Display, Kyung Hee University, Dongdaemoon-gu, Seoul 130-701, Republic of Korea;2. Department of Physics, Kyung Hee University, Dongdaemoon-gu, Seoul 130-701, Republic of Korea;3. Material Development Team, Research Center, Samsung Display Co. Ltd., 95 Samsung 2-ro, Giheung-gu, Yongin-si, Gyeonggi-do 446-711, Republic of Korea;1. National Engineering Lab for TFT-LCD Materials and Technologies, Department of Electronic Engineering, Shanghai Jiao Tong University, Shanghai 200240, People’s Republic of China;2. State Key Laboratory of Coordination Chemistry, Nanjing National Laboratory of Microstructures, School of Chemistry and Chemical Engineering, Nanjing University, Nanjing 210093, People’s Republic of China;3. Department of Green Energy & Semiconductor Engineering, Hoseo University, Asan, South Korea;1. Optoelectronics Laboratory, Department of Physics, National Institute of Technology Karnataka, Surathkal, Mangalore 575 025, India;2. Department of Chemistry, National Institute of Technology Karnataka, Surathkal, Mangalore 575 025, India |
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| Abstract: | White fluorescent OLED devices with a 10 nm thick blue-emitting layer and a 31 nm thick orange-emitting layer have been fabricated, where the blue-emitting layer is stacked on a hole transport layer. An interlayer was inserted between the two emitting layers. The thickness of the interlayer was changed among 0.3, 0.4, and 1.0 nm. White emission with CIE coordinates close to (0.33, 0.33) was observed from all the OLEDs. OLED with 0.3 nm thick interlayer gives the highest maximum luminous efficiency (11 cd/A), power efficiency (9 lm/W), and external quantum efficiency (5.02%). The external quantum efficiency becomes low with increasing the interlayer thickness from 0 nm to 1.0 nm. When the location of the blue- and orange-emitting layers is reversed, white emission was not obtained because of too weak blue emission. It is suggested that the electron–hole recombination zone decreases nearly exponentially with a distance from the hole transport layer. |
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