Issue 45, 2022

Modulating up-conversion and non-radiative deactivation to achieve efficient red thermally activated delayed fluorescence emitters

Abstract

The development of efficient red electroluminescent devices is one of the formidable challenges in organic light emitting diode (OLED) research. In this work, we reported three efficient red thermally activated delayed fluorescence (TADF) emitters based on the novel dibenzothioxanthene acceptor: 2SO-AD, 2SO-TBU and 2SO-F-TBU. The novel dibenzothioxanthene acceptor with large conjugation allows the energy of the locally excited triplet (3LE) state from the acceptor(A)-segment (3LEA) to be close to the charge transfer (CT) states in red emitters, thus enabling participation of the LE state to facilitate the reverse intersystem crossing (RISC) process. Furthermore, the bulky donor can effectively suppress the aggregation-caused quenching (ACQ), resulting in low non-radiative deactivation of 6.5 × 106 s−1. The red OLED devices based on 2SO-TBU and 2SO-F-TBU emitters achieved the maximum external quantum efficiency (EQEmax) of 16.27% and 14.47%, respectively. This work paves a new way towards efficient red TADF emitters.

Graphical abstract: Modulating up-conversion and non-radiative deactivation to achieve efficient red thermally activated delayed fluorescence emitters

Supplementary files

Article information

Article type
Communication
Submitted
30 sen 2022
Accepted
03 noy 2022
First published
04 noy 2022

J. Mater. Chem. C, 2022,10, 17053-17058

Modulating up-conversion and non-radiative deactivation to achieve efficient red thermally activated delayed fluorescence emitters

T. Gao, S. Shen, Y. Qin, H. Gao, X. Dong, Z. Pang, P. Wang, Y. Wang and X. Hu, J. Mater. Chem. C, 2022, 10, 17053 DOI: 10.1039/D2TC04138C

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