Issue 19, 2022

Influence of regioisomerism in bis(terpyridine) based exciplexes with delayed fluorescence

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.

Graphical abstract: Influence of regioisomerism in bis(terpyridine) based exciplexes with delayed fluorescence

Supplementary files

Article information

Article type
Paper
Submitted
26 fev 2022
Accepted
22 abr 2022
First published
25 abr 2022

J. Mater. Chem. C, 2022,10, 7699-7706

Influence of regioisomerism in bis(terpyridine) based exciplexes with delayed fluorescence

A. L. Schleper, S. Hillebrandt, C. Bannwarth, A. Mischok, S. Kwon, F. Buchner, F. Tenopala-Carmona, R. J. Behm, F. D. Goll, P. J. Welscher, M. Usselmann, U. Ziener, M. C. Gather and A. J. C. Kuehne, J. Mater. Chem. C, 2022, 10, 7699 DOI: 10.1039/D2TC00800A

To request permission to reproduce material from this article, please go to the Copyright Clearance Center request page.

If you are an author contributing to an RSC publication, you do not need to request permission provided correct acknowledgement is given.

If you are the author of this article, you do not need to request permission to reproduce figures and diagrams provided correct acknowledgement is given. If you want to reproduce the whole article in a third-party publication (excluding your thesis/dissertation for which permission is not required) please go to the Copyright Clearance Center request page.

Read more about how to correctly acknowledge RSC content.

Social activity

Spotlight

Advertisements