Color stable and low driving voltage white organic light-emitting diodes with low efficiency roll-off achieved by selective hole transport buffer layers |
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| Authors: | Zhensong Zhang Guohua Xie Shouzhen Yue Qingyang Wu Yu Chen Shiming Zhang Li Zhao Yang Luo Yi Zhao Shiyong Liu |
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| Affiliation: | 1. State Key Laboratory on Integrated Optoelectronics, College of Electronics Science and Engineering, Jilin University, 2699 Qianjin Street, Changchun 130012, People’s Republic of China;2. Institut für Angewandte Photophysik, Technische Universtität Dresden, 01062 Dresden, Germany |
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| Abstract: | White organic light-emitting diodes (WOLEDs) showing high color stability, low operating voltage, high efficiency and low efficiency roll-off by adopting different hole transport buffer layers which also behaves as electron/exciton blocking layers (EBL) have been developed. The characteristics of WOLEDs based on blue–green and orange phosphors could be easily manipulated by hole transport buffer layer, which tailors charge carrier transportation and energy transfer. Our WOLEDs show low operating voltages, 100 cd/m2 at 3.2 V, 1000 cd/m2 at 3.7 V and 10000 cd/m2 at 4.8 V, respectively, and achieve a current efficiency of 35.0 cd/A, a power efficiency of 29.0 lm/W at a brightness of 1000 cd/m2, and a low efficiency roll-off 8.7% calculated from the maximum efficiency value to that of 5000 cd/m2. |
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| Keywords: | White light Low operating voltage High color stability Low efficiency roll-off Hole transport buffer layers |
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