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- W4313397785 endingPage "106715" @default.
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- W4313397785 abstract "Host materials which can restrain the detrimental and intrinsic triplet-triplet annihilation play a critical role in the development of highly efficient and stable phosphorescent organic light-emitting diodes (OLEDs). Two benzimidazole-carbazole hybrid bipolar host materials 9,9'-(4-(1-phenyl-1H-benzo[d]imidazole-2-yl)-1,3-phenylene)bis(9H-carbazole) (BCzBI) and 9,9'-(3-(1-phenyl-1H-benzo[d]imidazole-2-yl)pyridine-2,6-diyl)bis(9H-carbazole) (N-BCzBI) via subtly modulating the ratio of donor/acceptor were designed and synthesized. The electron-withdrawing pyridine group was introduced with the expectation to promote electron-injecting/-transporting ability for N-BCzBI. In comparison with BCzBI, N-BCzBI showed high thermostability (397 versus 378 °C), obviously lowered LUMO level and almost unchanged triplet energy level and energy bandgap (2.49/2.46 eV; 3.45/3.33 eV). Green phosphorescent OLEDs adopting BCzBI/N-BCzBI as host were investigated and exhibited excellent electrophophorescent performances. More interestingly, the N-BCzBI-hosted green phosphorescent device demonstrated better performance of 24.6% (the maximum EQE), 88.5 cd A−1 (the maximum current efficiency) and 78.5 lm W−1 (the maximum power efficiency). Notably, the efficiencies of N-BCzBI-hosted OLEDs remained to be as high as 24.4% and 24.2% even at high luminance of 1000 and 5000 cd m−2. This work eloquently indicates that rational regulation on carrier-transporting characteristics of host materials plays an important role in enhancing phosphorescent OLEDs performances." @default.
- W4313397785 created "2023-01-06" @default.
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- W4313397785 date "2023-02-01" @default.
- W4313397785 modified "2023-09-25" @default.
- W4313397785 title "Benzimidazole/carbazole-based bipolar host materials for highly efficient green phosphorescent OLEDs with negligible efficiency roll-off" @default.
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- W4313397785 doi "https://doi.org/10.1016/j.orgel.2022.106715" @default.
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