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π–π stacking: a strategy to improve the electron mobilities of bipolar hosts for TADF and phosphorescent devices with low efficiency roll-off

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Abstract

A series of D–π–A type bipolar hosts based on triphenylene/carbazole were designed and synthesized. π–π stacking of the triphenylene units between two adjacent molecules renders these hosts high electron mobilities above 1 × 10−4 cm2 V−1 s−1, and their electron and hole mobilities can be regulated through varying the connection position and π moieties. Due to more balanced charge mobilities, a D1-based green thermally activated delayed fluorescence (TADF) device achieved the highest external quantum efficiency (EQE) of 16.3%, and its EQE could still maintain 15.3% and 13.8% at the high luminance of 5000 cd m−2 and 10 000 cd m−2, respectively. D1-based green phosphorescent devices also exhibited the highest EQE of 18.6% with a reduced roll-off to 17.6% at 5000 cd m−2 and 16.2% at 10 000 cd m−2.

Graphical abstract: π–π stacking: a strategy to improve the electron mobilities of bipolar hosts for TADF and phosphorescent devices with low efficiency roll-off

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Publication details

The article was received on 16 Feb 2017, accepted on 07 Mar 2017, published on 07 Mar 2017 and first published online on 07 Mar 2017


Article type: Paper
DOI: 10.1039/C7TC00733G
Citation: J. Mater. Chem. C, 2017, Advance Article
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    π–π stacking: a strategy to improve the electron mobilities of bipolar hosts for TADF and phosphorescent devices with low efficiency roll-off

    M. Cai, X. Song, D. Zhang, J. Qiao and L. Duan, J. Mater. Chem. C, 2017, Advance Article , DOI: 10.1039/C7TC00733G

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