期刊
JOURNAL OF MATERIALS CHEMISTRY C
卷 3, 期 14, 页码 3304-3310出版社
ROYAL SOC CHEMISTRY
DOI: 10.1039/c5tc00205b
关键词
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资金
- National Natural Science Foundation of China [51333007, 91433201]
- Ministry of Science and Technology of China (973 program) [2013CB834805]
- Foundation of Jilin Research Council [2012ZDGG001, 20130206003GX]
- Chinese Academy of Sciences [KGZD-EW-303-3]
- CAS Instrument Project [YZ201103]
Although previously reported all-phosphorescent white organic light-emitting diodes (WOLEDs) exhibit impressive electroluminescence efficiencies, problems remain in terms of the severe efficiency roll-off at high brightness. Here, a smart design of the emissive zone structure is presented to make full use of generated excitons to realize high efficiency all-phosphorescent WOLEDs with reduced efficiency roll-off. The fabricated WOLED shows a maximum power efficiency (PE) of 46.6 lm W-1, a current efficiency (CE) of 46.4 cd A(-1) and an external quantum efficiency (EQE) of 22.4%. These values remain as high as 41.3 lm W-1, 46.2 cd A(-1) and 22.0%, respectively, at a brightness of 1000 cd m(-2), exhibiting less pronounced efficiency roll-off. The critical current density, where the EQE declines by half from its peak, reaches 220 mA cm(-2), which should be a high value for all-phosphorescent WOLEDs with an external quantum efficiency of over 20%.
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