Work

Recent Progress in Strategies to Enhance the Spin‐Orbit Coupling of Multiresonance Thermally Activated Delayed Fluorescent Materials for Narrowband Organic Light‐Emitting Diodes

Year: 2025

Type: article

Abstract: Due to their remarkable performance and exceptional color purity, the multiresonance thermally activated delayed fluorescent (MR‐TADF) materials are prioritized in the research of narrowband organic light‐emitting diodes (OLEDs). However, the atomic numbers of elements such as carbon (C), boron (B), and nitrogen (N) used for B–N‐based MR‐TADF system are relatively small, which offers limited spin‐orbit coupling (SOC) strength. Furthermore, the singular short‐range charge‐transfer (SRCT) characteristics of MR‐TADF emitters also result in the small SOC matrix elements between singlet and triplet excited states. Both lead to a slow reverse intersystem crossing (RISC) process, which constrains their further development in OLED devices. This review focuses on the molecular design strategies aimed at enhancing the SOC, including heavy atom and long‐range charge‐transfer (LRCT) strategies, with the objective of systematizing knowledge in this domain to facilitate the prosperous development of MR‐TADF emitters with high RISC rates. Finally, the challenges and prospects in this area are discussed comprehensively at the end of the review.

Source: Advanced Photonics Research

DOI: 10.1002/adpr.202500177

Authors: Hanrui Su, Shan Huang, Runda Guo, Lei Wang

Institutions: Wuhan National Laboratory for Optoelectronics, Huazhong University of Science and Technology

Language: English

Topic: Organic Light-Emitting Diodes Research

Subfield: Electrical and Electronic Engineering

Field: Engineering

Domain: Physical Sciences

Open Access status: gold

Estimated APC paid: $3,070

Funder: National Natural Science Foundation of China