TY - JOUR
T1 - Influence of regioisomerism in bis(terpyridine) based exciplexes with delayed fluorescence
AU - Schleper, A. Lennart
AU - Hillebrandt, Sabina
AU - Bannwarth, Christoph
AU - Mischok, Andreas
AU - Kwon, Seonil
AU - Buchner, Florian
AU - Tenopala-Carmona, Francisco
AU - Behm, R. Jürgen
AU - Goll, Felix D.
AU - Welscher, Philipp J.
AU - Usselmann, Michael
AU - Ziener, Ulrich
AU - Gather, Malte C.
AU - Kuehne, Alexander J. C.
N1 - Funding: A. L. S. acknowledges financial support through a Cusanuswerk scholarship. The authors acknowledge support by the state of Baden-Württemberg through bwHPC and the German Research Foundation (DFG) through grant no INST 40/575-1 FUGG (JUSTUS and JUSTUS 2 cluster). M. C. G. acknowledges support from the Leverhulme Trust (RPG-2016047) and the Alexander von Humboldt Stiftung through the Humboldt-Professorship. A. M. acknowledges support from the European Union's Horizon 2020 research and innovation programme under the Marie Skłodowska-Curie grant agreement No. 101023743 (PolDev). C. B. acknowledges funding by the BMBF and the Ministry of Culture and Science of the German State of North Rhine-Westphalia (MKW) under the Excellence Strategy of the Federal Government and the Länder.
PY - 2022/5/21
Y1 - 2022/5/21
N2 - 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.
AB - 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.
U2 - 10.1039/d2tc00800a
DO - 10.1039/d2tc00800a
M3 - Article
SN - 2050-7526
VL - 10
SP - 7699
EP - 7706
JO - Journal of Materials Chemistry C
JF - Journal of Materials Chemistry C
IS - 19
ER -