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Issue 3, 2018
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Efficient non-doped yellow OLEDs based on thermally activated delayed fluorescence conjugated polymers with an acridine/carbazole donor backbone and triphenyltriazine acceptor pendant

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Abstract

Polymers with thermally activated delayed fluorescence (TADF) are very suitable and promising emitters for use in solution-processed organic light-emitting diodes (OLEDs). However, only a few efficient TADF polymers have been reported to date. In this work, a series of polymers with acridine/carbazole donor backbones and triphenyltriazine acceptor pendant are synthesized. The polymers show remarkable TADF due to the intrinsic twisted donor/acceptor structure derived from the copolymerization monomer and have a high photoluminescence quantum yield of up to 90%, in neat films, through management of the monomer ratios. Non-doped OLEDs based on the polymers display a yellow emission and achieve maximum external quantum and power efficiencies of up to 15.5% and 50.5 lm W−1. More importantly, the non-doped devices possess low turn-on and driving voltages of 2.53 V and 4.05 V (1000 cd m−2) with an extremely small efficiency roll-off of as low as 0.5%. Compared with doped devices, non-doped devices exhibit superior electroluminescent performances, with similar efficiencies but a lower efficiency roll-off and driving voltage, verifying that the designed conjugated polymers are superior emitters for non-doped TADF OLEDs by simple solution-processing.

Graphical abstract: Efficient non-doped yellow OLEDs based on thermally activated delayed fluorescence conjugated polymers with an acridine/carbazole donor backbone and triphenyltriazine acceptor pendant

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Publication details

The article was received on 02 Nov 2017, accepted on 15 Dec 2017 and first published on 18 Dec 2017


Article type: Paper
DOI: 10.1039/C7TC04994C
Citation: J. Mater. Chem. C, 2018,6, 568-574
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    Efficient non-doped yellow OLEDs based on thermally activated delayed fluorescence conjugated polymers with an acridine/carbazole donor backbone and triphenyltriazine acceptor pendant

    Y. Wang, Y. Zhu, X. Lin, Y. Yang, B. Zhang, H. Zhan, Z. Xie and Y. Cheng, J. Mater. Chem. C, 2018, 6, 568
    DOI: 10.1039/C7TC04994C

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