Universität zu Köln

Keum, Changmin, Becker, David, Archer, Emily ORCID: 0000-0001-8513-3918, Bock, Harald, Kitzerow, Heinz, Gather, Malte C. ORCID: 0000-0002-4857-5562 and Murawski, Caroline ORCID: 0000-0002-3496-4110 (2020). Organic Light-Emitting Diodes Based on a Columnar Liquid-Crystalline Perylene Emitter. Adv. Opt. Mater., 8 (17). WEINHEIM: WILEY-V C H VERLAG GMBH. ISSN 2195-1071

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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, the key photophysical properties of the columnar liquid crystalline emitter perylene-3,4,9,10-tetracarboxylic tetraethyl ester (PTCTE) are investigated and the material is implemented into OLEDs. It is found 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 among the best performances of OLEDs based on columnar liquid crystalline emitters reported so far.

Item Type:	Journal Article
Creators:	Creators Email ORCID ORCID Put Code Keum, Changmin UNSPECIFIED UNSPECIFIED UNSPECIFIED Becker, David UNSPECIFIED UNSPECIFIED UNSPECIFIED Archer, Emily UNSPECIFIED orcid.org/0000-0001-8513-3918 UNSPECIFIED Bock, Harald UNSPECIFIED UNSPECIFIED UNSPECIFIED Kitzerow, Heinz UNSPECIFIED UNSPECIFIED UNSPECIFIED Gather, Malte C. UNSPECIFIED orcid.org/0000-0002-4857-5562 UNSPECIFIED Murawski, Caroline UNSPECIFIED orcid.org/0000-0002-3496-4110 UNSPECIFIED
URN:	urn:nbn:de:hbz:38-321193
DOI:	10.1002/adom.202000414
Journal or Publication Title:	Adv. Opt. Mater.
Volume:	8
Number:	17
Date:	2020
Publisher:	WILEY-V C H VERLAG GMBH
Place of Publication:	WEINHEIM
ISSN:	2195-1071
Language:	English
Faculty:	Faculty of Mathematics and Natural Sciences
Divisions:	Faculty of Mathematics and Natural Sciences > Department of Chemistry > Institute of Physical Chemistry
Subjects:	no entry
Uncontrolled Keywords:	Keywords Language MOLECULAR-ORIENTATION; ELECTROLUMINESCENT; TRANSPORT; LUMINESCENCE; DEVICES; OLEDS; EXCIPLEX; ESTERS; FILMS Multiple languages Materials Science, Multidisciplinary; Optics Multiple languages
Refereed:	Yes
URI:	http://kups.ub.uni-koeln.de/id/eprint/32119