Issue 41, 2023

Modification of thermally activated delayed fluorescence emitters comprising acridan–pyrimidine moieties for efficient sky-blue to greenish-blue OLEDs

Abstract

Thermally activated delayed fluorescence (TADF) is a promising approach to harvest triplet excitons and achieve high-performance organic light-emitting diodes (OLEDs) for displays. In this study, we synthesized two new TADF emitters, 4Ac25CzPy and 4Ac35CzPy, featuring acridan–pyrimidine–carbazole moieties. Remarkably, a slight modification in the carbazole group position enables precise control of luminous color, resulting in emissions at 483 nm and 494 nm for 4Ac25CzPy and 4Ac35CzPy, respectively, in the electroluminescent device. Both compounds exhibit small energy difference between their singlet and triplet states (ΔEST) of 0.14 eV and 0.15 eV, confirming their TADF characteristics. Notably, OLEDs utilizing 4Ac35CzPy achieve outstanding performance with the maximum external quantum efficiency (ηEQE) of 21.2% and a photoluminescence quantum yield of 65.1%. This high efficiency is attributed to efficient energy transfer from the host to the emitter. Moreover, the 4Ac35CzPy device exhibits a high light outcoupling efficiency of 0.3, further enhancing its remarkable performance.

Graphical abstract: Modification of thermally activated delayed fluorescence emitters comprising acridan–pyrimidine moieties for efficient sky-blue to greenish-blue OLEDs

Supplementary files

Article information

Article type
Paper
Submitted
08 Aug 2023
Accepted
04 Oct 2023
First published
05 Oct 2023

J. Mater. Chem. C, 2023,11, 14395-14403

Modification of thermally activated delayed fluorescence emitters comprising acridan–pyrimidine moieties for efficient sky-blue to greenish-blue OLEDs

Y. Li, H. Liang, C. Chen, C. Chiu, B. Lin, J. A. Tan, J. Lee, T. Chiu and M. Leung, J. Mater. Chem. C, 2023, 11, 14395 DOI: 10.1039/D3TC02820H

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