Organic light-emitting diodes based on a columnar liquid-crystalline perylene emitter
Abstract
Liquid crystalline materials possess great potential as emitters in organic light-emitting diodes (OLEDs) due to their self-assembling property, which may lead to anisotropic films and improved charge transport. Here, we investigate key photophysical properties of the columnar liquid crystalline emitter perylene-3,4,9,10-tetracarboxylic tetraethyl ester (PTCTE) and implement the material into OLEDs. We find that vacuum-deposited PTCTE films exhibit preferential horizontal orientation of the transition dipole moment. Embedding the emitter into different host materials leads to increased photoluminescence quantum yield but reduces molecular orientation compared to the neat film. OLEDs containing PTCTE doped into an exciplex-forming co-host achieve very high luminance exceeding 10,000 cd m-2 at 5.7 V, which is amongst the best performance of OLEDs based on columnar liquid crystalline emitters reported so far.
Citation
Keum , C , Becker , D , Archer , E , Bock , H , Kitzerow , H , Gather , M C & Murawski , C 2020 , ' Organic light-emitting diodes based on a columnar liquid-crystalline perylene emitter ' , Advanced Optical Materials , vol. 8 , no. 17 , 2000414 . https://doi.org/10.1002/adom.202000414
Publication
Advanced Optical Materials
Status
Peer reviewed
ISSN
2195-1071Type
Journal article
Rights
Copyright © 2020 The Authors. Published by WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim. This is an open access article under the terms of the Creative Commons Attribution License, which permits use, distribution and reproduction in any medium, provided the original work is properly cited.
Description
Funding: UK EPSRC NSF-CBET lead agency agreement (EP/R010595/1, 1706207). C.K. acknowledges support from the Basic Science Research Program through the National Research Foundation of Korea (NRF) funded by the Ministry of Education (2017R1A6A3A03012331).Collections
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