Sulfur-locked multiple resonance emitters for high performance orange-red/deep-red OLEDs

Yexuan Pu, Qian Jin, Yuewei Zhang (), Chenglong Li (), Lian Duan () and Yue Wang ()
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Yexuan Pu: Jilin University
Qian Jin: Tsinghua University
Yuewei Zhang: Tsinghua University
Chenglong Li: Jilin University
Lian Duan: Tsinghua University
Yue Wang: Jilin University

Nature Communications, 2025, vol. 16, issue 1, 1-10

Abstract: Abstract Multiple resonance thermally activated delayed fluorescence (MR-TADF) materials are preferred for their high efficiency and high colour purity in organic light-emitting diodes (OLEDs). However, the design strategies of MR-TADF emitters in the red region are very limited. Herein, we propose a concept for a paradigm shift in orange-red/deep-red MR emitters by linking the outer phenyl groups in a classical MR framework through intramolecular sulfur (S) locks. Endowed with the planar architectural feature of the MR mother core, the proof-of-concept S-embedded emitters S-BN and 2S-BN also exhibit considerable flatness, which proves critical in avoiding the direct establishment of potent charge transfer states and inhibiting the non-radiative decay process. The emission maxima of S-BN and 2S-BN are 594 nm and 671 nm, respectively, and both have a high photoluminescence quantum yield of ~100%, a rapid radiative decay rate of around 107 s−1, and a remarkably high reverse intersystem crossing rates of about 105 s−1. Notably, maximum external quantum efficiencies of 39.9% (S-BN, orange-red) and 29.3% (2S-BN, deep-red) were also achieved in typical planar OLED structures with ameliorated efficiency roll-offs.

Date: 2025
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DOI: 10.1038/s41467-024-55680-2

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