Issue 4, 2024

Multiplying the electroluminescence efficiencies of red TADF emitters via a regioisomeric approach of the donor unit

Abstract

A regioisomeric strategy is of great significance to the design of molecules with red thermally activated delayed fluorescence (TADF); however, previous studies have mainly focused on the regioisomerism of acceptor frameworks. Herein, we propose a donor-induced regioisomeric strategy for developing red TADF emitters for the first time. Intriguingly, DPDPZ-PXZPh, with 3-position connected 10-phenyl-10H-phenoxazine (PhPXZ) as the donor exhibits a faster radiative rate, lower reorganization energies, and a superior photoluminescence quantum yield compared with the control compound DPDPZ-PhPXZ containing a 14-position connected PhPXZ. The corresponding organic light-emitting diode (OLED) based on DPDPZ-PXZPh not only achieves an evidently redshifted emission peaking at 600 nm but also delivers a much-improved external quantum efficiency of 28.0%, which is a nearly 1.6-fold efficiency enhancement relative to the DPDPZ-PhPXZ-based device (17.8%). This result demonstrates the important role of donor linking engineering in constructing high-performance red TADF emitters, offering a new isomeric pattern for developing high-efficiency red OLEDs.

Graphical abstract: Multiplying the electroluminescence efficiencies of red TADF emitters via a regioisomeric approach of the donor unit

Supplementary files

Article information

Article type
Research Article
Submitted
31 10月 2023
Accepted
15 12月 2023
First published
15 12月 2023

Mater. Chem. Front., 2024,8, 1120-1127

Multiplying the electroluminescence efficiencies of red TADF emitters via a regioisomeric approach of the donor unit

X. Zhang, H. Wang, J. Chen, L. Zhou, X. Hao, J. Yu, K. Wang and X. Zhang, Mater. Chem. Front., 2024, 8, 1120 DOI: 10.1039/D3QM01170D

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