Efficient fluorescent white organic light-emitting devices with a reduced efficiency roll-off based on a blue ambipolar fluorescent emitter |
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Institution: | 1. College of Instrumentation & Electrical Engineering, Jilin University, Changchun 130000, China;2. State Key Laboratory on Integrated Optoelectronics, College of Electronic Science and Engineering, Jilin University, Changchun 130012, China |
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Abstract: | White organic light-emitting devices (WOLEDs) with fluorescent donor-acceptor-substituted spirobifluorene compounds (red 2-diphenylamino-7-(2,2-dicyanovinyl)-9,9′-spirobifluorene and blue 2-diphenylamino-7-(2,2-diphenylvinyl)-9,9′-spirobifluorene) have been fabricated. The optimized WOLEDs shows a maximum current efficiency 5.9 cd/A and very low efficiency roll-off. From the brightness at maximum current efficiency to high brightness of 10000 cd/m2, the current efficiency roll-off is only 0.4%. It can be attributed to the ambipolar blue fluorescent emitter with voltage-independnet mobility which makes the device having a broader charge recombination zone and balance of carrier transport. |
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Keywords: | Fluorescent WOLEDs Efficiency roll-off Ambipolar fluorescent emitter |
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