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- W2801425410 abstract "In this work, a series of two color white organic light-emitting diodes (WOLEDs) with color rendering index (CRI) exceeding 90 were demonstrated via an ultra-simple novel device structure. The proposed WOLEDs were structured by simply doping exciplex donor of m-MTDATA in the Bepp2 side of bilayer structure TAPC (HTL)/Bepp2 (ETL), where the Bepp2:m-MTDATA layer is away from HTL/ETL interface for a certain distance. And white emission was realized by combining yellow emission of Bepp2:m-MTDATA forming exciplex and blue emission of Bepp2 spacer layer between HTL and Bepp2: m-MTDATA layer. The optimized WOLED exhibits a low driving voltage of 2.7 V, and also achieves the high maximum luminance and power efficiency of 5561 cd/m2 and 11.08 lm/W, and an ultra-high CRI of 93 at a practical luminance of 5000 cd/m2. To the best of our knowledge, the CRI is by far the highest value for two-color WOLEDs with exciplex emission. The detailed working mechanism was unveiled by checking the influence of the thickness of Bepp2 space layer and the mixing ratio and thickness of Bepp2:m-MTDATA layer on the device performance. It was found that in addition to yellow emission, the exciplex emitting layer of Bepp2: m-MTDATA in the proposed devices is also served as a feasible carrier adjusting layer, which was realized by changing its mixing ratio between donor and accepter to affect the distribution of charges, contributing to high CRI white emission." @default.
- W2801425410 created "2018-05-17" @default.
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- W2801425410 date "2018-09-01" @default.
- W2801425410 modified "2023-10-17" @default.
- W2801425410 title "Ultra-simple two color WOLEDs with CRI exceeding 90 based on electron-transporting Bepp2 simultaneously as blue emitter and exciplex acceptor" @default.
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- W2801425410 doi "https://doi.org/10.1016/j.jlumin.2018.04.067" @default.
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