Citation: Zehua Zhang, Haitao Yu, Yanyu Qi. Design Strategy for Thermally Activated Delayed Fluorescence Materials with Multiple Resonance Effect[J]. Acta Physico-Chimica Sinica, ;2025, 41(1): 100006. doi: 10.3866/PKU.WHXB202309042 shu

Design Strategy for Thermally Activated Delayed Fluorescence Materials with Multiple Resonance Effect

Hebei Key Laboratory of Organic Functional Molecules, College of Chemistry and Materials Science, Hebei Normal University, Shijiazhuang 050024, China

Corresponding author: Haitao Yu, haitaoyu@hebtu.edu.cn Yanyu Qi, hbsdqyy@hebtu.edu.cn
Received Date: 27 September 2023
Revised Date: 7 November 2023
Accepted Date: 9 November 2023

Fund Project: the National Natural Science Foundation of China 21971054the National Natural Science Foundation of China 22002092S&T Program of Hebei B2022205014S&T Program of Hebei 22567622HScience Research Project of Hebei Education Department BJK2023014Postdoctoral Research Projects Merit-based Funding Programs of Hebei Province B2023005008Shijiazhuang Science and Technology Research and Development Program 241791047Athe Science Foundation of Hebei Normal University L2022B12the Science Foundation of Hebei Normal University L2023T01

Since the initial report on multiple resonance thermally activated delayed fluorescence (MR-TADF) molecules, their narrow band emissions, high quantum yields and other characteristics have consistently fueled research interest in the realm of organic electronics, particularly organic light emitting diodes (OLED). These molecules swiftly ascended to the forefront of research, serving as a pivotal focus, giving rise to numerous high-performance devices and meticulously crafted molecules. Devices featuring MR-TADF molecules as the luminescent core continually redefine our comprehension of OLED, with some employing hyperfluorescence technology attaining peak performance in specific photochromic domains today. Presently, with the escalating demand for ultra-high-resolution displays, the international telecommunication union (ITU) has unveiled the next generation color gamut standard, BT.2020. This standard delineates the broadest display color gamut, mandating monochromatic primary color wavelengths of 467, 532, and 630 nm, constituting an exceptionally extensive color gamut. Simultaneously, achieving high-resolution displays with such an expansive color gamut imposes unprecedentedly stringent requirements on the color purity of device elements. Consequently, it imposes a formidable color purity target for display technology. In the past, traditional fluorescent materials struggled to meet these demands. The advent of BT.2020, however, has presented new opportunities for the advancement of MR-TADF molecules, leading to a surge in popularity in this field. In recent years, with copious research and practical applications, the MR-TADF molecular family has undergone rapid evolution. Nevertheless, discussions and summaries primarily centered on the field's development, with limited focus on molecular design strategies. This deficiency hinders adequate reference for researchers entering the field. Consequently, this article expounds upon the design principles of select MR-TADF molecules reported in the past three years. It delves into aspects such as the X-π-X principle, fast reverse intersystem crossing processes, narrow-band emission, and high oscillator strength. Additionally, it posits future design directions, including the incorporation of non-traditional structures into the MR-TADF domain. Finally, the article offers suggestions for the prospective development and industrialization of the MR-TADF field.
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沈阳化工大学材料科学与工程学院沈阳 110142