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Boosting electroluminescent efficiency of solution-processed thermally activated delayed fluorescence OLEDs by a versatile hole-transporting layer of organic-inorganic hybrid perovskite

Abstract

An organic-inorganic hybrid perovskite (OIHP), namely CzEAP, containing a large organic ammonium, 2-(9H-carbazol-9-yl)ethanaminium bromide, was synthesized and exhibited a large band gap of 3.5 eV, a maximum valence band energy level of -6.6 eV, and moderate hole mobility comparable to organic hole-transporting materials. Employing CzEAP as a hole-transporting layer (HTL) in solution-processed organic light-emitting diodes (OLEDs) based on a typical thermally activated delayed fluorescence (TADF) emitter, 2,4,5,6-tetrakis(carbazol-9-yl)-1,3-dicyanobenzene (4CzIPN), resulted in a peak external quantum efficiency of 15.3%, which is nearly two times higher than that of a reference device with PEDOT:PSS hole injection layer alone. The origin of this significant improvement was explored to be versatile functionality of the CzEAP as HTL, which is to suppress exciton quenching, improve emission efficiency and promote reverse intersystem crossing (RISC) rate of TADF emitters via external heavy-atom effect. This finding unlocks great potential of OIHPs as excellent HTL materials for high-efficiency solution-processed TADF OLEDs.

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Publication details

The article was received on 04 Apr 2018, accepted on 10 May 2018 and first published on 12 May 2018


Article type: Paper
DOI: 10.1039/C8TC01567H
Citation: J. Mater. Chem. C, 2018, Accepted Manuscript
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    Boosting electroluminescent efficiency of solution-processed thermally activated delayed fluorescence OLEDs by a versatile hole-transporting layer of organic-inorganic hybrid perovskite

    T. Zhou, C. Liu, S. Gong, Y. Xiang, G. Xie and C. Yang, J. Mater. Chem. C, 2018, Accepted Manuscript , DOI: 10.1039/C8TC01567H

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