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

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