Issue 12, 2022

Enhanced blue TADF in a D–A–D type naphthyridine derivative with an asymmetric carbazole-donor motif

Abstract

Efficient triplet-to-singlet conversion in conventional donor–acceptor TADF compounds relies on charge-transfer (CT) and locally-excited (LE) triplet state mixing as this provides the required spin–orbit coupling. In this work, an asymmetric carbazole-donor motif is shown to facilitate the coupling and spin–flip process in a naphthyridine-acceptor based TADF emitter due to the enhanced LE character of the lowest triplet state. This was revealed from the delayed fluorescence measurements, which clearly signified a doubled RISC rate (up to 1.33 × 106 s−1) and a shortened delayed fluorescence lifetime (down to 4.4 μs) in an asymmetric compound compared to those of symmetric or singly-carbazole-substituted compounds. The promising features of the asymmetric blue TADF emitter were demonstrated to result in high efficiency OLEDs (external quantum efficiency of 21%) with a reduced efficiency roll-off.

Graphical abstract: Enhanced blue TADF in a D–A–D type naphthyridine derivative with an asymmetric carbazole-donor motif

Supplementary files

Article information

Article type
Paper
Submitted
20 okt 2021
Accepted
28 dec 2021
First published
29 dec 2021

J. Mater. Chem. C, 2022,10, 4813-4820

Enhanced blue TADF in a D–A–D type naphthyridine derivative with an asymmetric carbazole-donor motif

D. Banevičius, G. Kreiza, R. Klioštoraitis, S. Juršėnas, T. Javorskis, V. Vaitkevičius, E. Orentas and K. Kazlauskas, J. Mater. Chem. C, 2022, 10, 4813 DOI: 10.1039/D1TC05061C

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