Advances in Thermally Activated Delayed Fluorescence of Transition Metal Complexes

ZHANG Jingling; LI Kai; YANG Chuluo

doi:10.37188/CJL.20220308

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Advances in Thermally Activated Delayed Fluorescence of Transition Metal Complexes

Invited Paper | 更新时间：2023-02-16

- Advances in Thermally Activated Delayed Fluorescence of Transition Metal Complexes
  增强出版
- Chinese Journal of Luminescence Vol. 44, Issue 1, Pages: 12-25(2023)
- 作者机构：
  
  1.深圳大学材料科学与工程学院，深圳市新型信息显示与存储材料重点实验室，广东深圳　518055
- 作者简介：
- 基金信息：
  
  National Natural Science Foundation of China(21801170);GuangDong Basic and Applied Basic Research Foundation(2021A1515010175)
- DOI：10.37188/CJL.20220308
  CLC：
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ZHANG Jingling, LI Kai, YANG Chuluo. Advances in Thermally Activated Delayed Fluorescence of Transition Metal Complexes. [J]. Chinese Journal of Luminescence 44(1):12-25(2023)
DOI：

ZHANG Jingling, LI Kai, YANG Chuluo. Advances in Thermally Activated Delayed Fluorescence of Transition Metal Complexes. [J]. Chinese Journal of Luminescence 44(1):12-25(2023) DOI： 10.37188/CJL.20220308.

摘要

高效率利用三重态激子发光是制备高性能有机发光二极管（OLED）的关键。除磷光过渡金属配合物外，具有热活化延迟荧光（TADF）特性的过渡金属配合物能够将三重态激子上转换为单重态激子，进而通过单重态激子辐射发光，为开发金属配合物发光材料提供了新的途径。然而，过去十年来OLED发光材料的研究主要聚焦在纯有机TADF体系上，过渡金属配合物TADF材料的研究投入相对偏少。但是，已有研究表明金属配合物能够利用金属的重原子效应促进反向系间窜越（RISC）过程，提升TADF发光效率并缩短TADF寿命，有利于制备高效率、低滚降的OLED。本文根据金属中心不同的d电子构型分类筛选了TADF金属配合物研究领域中代表性的材料体系，对其激发态属性、光物理和器件性能进行了概括和讨论。通过对不同类型的TADF金属配合物发光性能的归纳和比较，揭示了金属中心和配体结构对配合物发光性质的影响规律，对进一步开发高性能的金属配合物TADF材料，尤其是基于廉价金属元素的TADF配合物具有重要的指导意义。

Abstract

Efficient harvesting of triplet excitons is crucial to the development of high-performance organic light-emitting diodes（OLEDs）. Other than phosphorescence， the thermally activated delayed fluorescence（TADF） mechanism enables the upconversion of triplet excitons to singlet ones ,via, reverse intersystem crossing（RISC）， followed by fluorescent radiation from the spin-allowed singlet excited states， providing another pathway to transition metal complexes for utilizing triplet excitons. However， the past decade has witnessed a blooming research interest in the purely organic TADF materials while the TADF metal complexes has only received much less attentions. Whereas， it has been shown that the presence of metal atom can boost the RISC rate through its heavy atom effect， leading to improved TADF emissions with high efficiencies and short lifetimes. Therefore， TADF metal complexes hold advantageous for the fabrication of high-performance OLEDs in terms of high-efficiency and small efficiency roll-off. This article summarizes the advances in TADF metal complexes by focusing on the excited state nature related to different electronic configurations， the photophysical and electroluminescence performance of representative TADF metal complexes. The structure-property relationship has been discussed which is conceived to provide useful guidelines for further design of TADF metal complexes， particularly those based on inexpensive metal elements.

关键词

热活化延迟荧光金属配合物有机发光二极管发光材料廉价金属

Keywords

thermally activated delayed fluorescence of metal complexesorganic light-emitting diodesluminescent materialsnon-precious metal

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