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Issue 14, 2017
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Tuning the twist angle of thermally activated delayed fluorescence molecules via a dendronization strategy: high-efficiency solution-processed non-doped OLEDs

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Abstract

Two thermally activated delayed fluorescence dendrimers, named 2CzSO and 3CzSO, are designed and synthesized via dendronizing 2,8-bis(3,6-di-tert-butyl-9H-carbazol-9-yl)dibenzo[b,d]thiophene-5,5-dioxide (1CzSO). By the dendronization strategy, two emitters acquire larger twist angles between electron donor and acceptor units compared with 1CzSO, resulting in a sequence of energy gaps between the lowest singlet and triplet states (ΔEST): 0.08 eV (3CzSO) < 0.12 eV (2CzSO) < 0.35 eV (1CzSO), and the order of DF lifetimes (τDF): 8.3 μs (3CzSO) < 14.2 μs (2CzSO) < 230 μs (1CzSO). Consequently, the non-doped solution-processed organic light-emitting device based on 2CzSO achieves a maximum external quantum efficiency of 10.7%, which is close to the highest values for non-doped solution-processed fluorescent OLEDs.

Graphical abstract: Tuning the twist angle of thermally activated delayed fluorescence molecules via a dendronization strategy: high-efficiency solution-processed non-doped OLEDs

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Publication details

The article was received on 09 Jan 2017, accepted on 10 Mar 2017 and first published on 10 Mar 2017


Article type: Paper
DOI: 10.1039/C7TC00119C
Citation: J. Mater. Chem. C, 2017,5, 3480-3487
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    Tuning the twist angle of thermally activated delayed fluorescence molecules via a dendronization strategy: high-efficiency solution-processed non-doped OLEDs

    Y. Li, T. Chen, M. Huang, Y. Gu, S. Gong, G. Xie and C. Yang, J. Mater. Chem. C, 2017, 5, 3480
    DOI: 10.1039/C7TC00119C

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