Universität zu Köln

Schleper, A. Lennart, Hillebrandt, Sabina ORCID: 0000-0002-2628-385X, Bannwarth, Christoph ORCID: 0000-0003-3242-496X, Mischok, Andreas ORCID: 0000-0003-4725-7404, Kwon, Seonil, Buchner, Florian ORCID: 0000-0002-0335-0722, Tenopala-Carmona, Francisco, Behm, R. Jurgen, Goll, Felix D., Welscher, Philipp J., Usselmann, Michael, Ziener, Ulrich, Gather, Malte C. and Kuehne, Alexander J. C. (2022). Influence of regioisomerism in bis(terpyridine) based exciplexes with delayed fluorescence. J. Mater. Chem. C, 10 (19). S. 7699 - 7707. CAMBRIDGE: ROYAL SOC CHEMISTRY. ISSN 2050-7534

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Abstract

Exciplexes of individual electron donor and acceptor molecules are a promising approach to utilizing otherwise non-emissive triplet states in optoelectronic applications. In this work, we synthesize a series of bis(terpyridine) pyrimidine (BTP) isomers and employ them as electron acceptors in complexes with tris(4-carbazoyl-9-ylphenyl)amine (TCTA). We show that these TCTA : BTP complexes produce thermally activated delayed fluorescence (TADF) by exciplex emission, and we investigate the influence of the nitrogen position in the pyridine on the optical and electronic properties of the exciplex. The molecular arrangement of the complex is studied using scanning tunneling microscopy (STM) as well as classical force field and density functional theory (DFT) simulations. Finally, we fabricate organic light-emitting diodes (OLEDs) with maximum external quantum efficiencies ranging between 0.5% and 2% - depending on the BTP isomer.

Item Type:	Journal Article
Creators:	Creators Email ORCID ORCID Put Code Schleper, A. Lennart UNSPECIFIED UNSPECIFIED UNSPECIFIED Hillebrandt, Sabina UNSPECIFIED orcid.org/0000-0002-2628-385X UNSPECIFIED Bannwarth, Christoph UNSPECIFIED orcid.org/0000-0003-3242-496X UNSPECIFIED Mischok, Andreas UNSPECIFIED orcid.org/0000-0003-4725-7404 UNSPECIFIED Kwon, Seonil UNSPECIFIED UNSPECIFIED UNSPECIFIED Buchner, Florian UNSPECIFIED orcid.org/0000-0002-0335-0722 UNSPECIFIED Tenopala-Carmona, Francisco UNSPECIFIED UNSPECIFIED UNSPECIFIED Behm, R. Jurgen UNSPECIFIED UNSPECIFIED UNSPECIFIED Goll, Felix D. UNSPECIFIED UNSPECIFIED UNSPECIFIED Welscher, Philipp J. UNSPECIFIED UNSPECIFIED UNSPECIFIED Usselmann, Michael UNSPECIFIED UNSPECIFIED UNSPECIFIED Ziener, Ulrich UNSPECIFIED UNSPECIFIED UNSPECIFIED Gather, Malte C. UNSPECIFIED UNSPECIFIED UNSPECIFIED Kuehne, Alexander J. C. UNSPECIFIED UNSPECIFIED UNSPECIFIED
URN:	urn:nbn:de:hbz:38-686808
DOI:	10.1039/d2tc00800a
Journal or Publication Title:	J. Mater. Chem. C
Volume:	10
Number:	19
Page Range:	S. 7699 - 7707
Date:	2022
Publisher:	ROYAL SOC CHEMISTRY
Place of Publication:	CAMBRIDGE
ISSN:	2050-7534
Language:	English
Faculty:	Unspecified
Divisions:	Unspecified
Subjects:	no entry
Uncontrolled Keywords:	Keywords Language LIGHT-EMITTING-DIODES; ELECTROLUMINESCENCE; OLIGOPYRIDINES; ASSEMBLIES; EFFICIENCY; DESIGN; TADF Multiple languages Materials Science, Multidisciplinary; Physics, Applied Multiple languages
URI:	http://kups.ub.uni-koeln.de/id/eprint/68680