Issue 13, 2022

Recent progress in thermally activated delayed fluorescence emitters for nondoped organic light-emitting diodes

Abstract

Nondoped organic light-emitting diodes (OLEDs) have drawn immense attention due to their merits of process simplicity, reduced fabrication cost, etc. To realize high-performance nondoped OLEDs, all electrogenerated excitons should be fully utilized. The thermally activated delayed fluorescence (TADF) mechanism can theoretically realize 100% internal quantum efficiency (IQE) through an effective upconversion process from nonradiative triplet excitons to radiative singlet ones. Nevertheless, exciton quenching, especially related to triplet excitons, is generally very serious in TADF-based nondoped OLEDs, significantly hindering the pace of development. Enormous efforts have been devoted to alleviating the annoying exciton quenching process, and a number of TADF materials for highly efficient nondoped devices have been reported. In this review, we mainly discuss the mechanism, exciton leaking channels, and reported molecular design strategies of TADF emitters for nondoped devices. We further classify their molecular structures depending on the functional A groups and offer an outlook on their future prospects. It is anticipated that this review can entice researchers to recognize the importance of TADF-based nondoped OLEDs and provide a possible guide for their future development.

Graphical abstract: Recent progress in thermally activated delayed fluorescence emitters for nondoped organic light-emitting diodes

Article information

Article type
Review Article
Submitted
24 12 2021
Accepted
21 2 2022
First published
22 2 2022
This article is Open Access

All publication charges for this article have been paid for by the Royal Society of Chemistry
Creative Commons BY-NC license

Chem. Sci., 2022,13, 3625-3651

Recent progress in thermally activated delayed fluorescence emitters for nondoped organic light-emitting diodes

Y. Shi, H. Wu, K. Wang, J. Yu, X. Ou and X. Zhang, Chem. Sci., 2022, 13, 3625 DOI: 10.1039/D1SC07180G

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