Research Progress of Thermally Activated Delayed Fluorescence Materials Based on Donor-Acceptor Structures Containing Carbazole Donor Molecules
ZHANG Tingting*, GAO Hui, YANG Yiqing, HONG Xingzhi, REN Ying, WU Haishun
Key Laboratory of Magnetic Molecules and Magnetic Information Materials of Ministry of Education, School of Chemistry and Materials Science, Shanxi Normal University, Linfen 041004, Shanxi, China
Abstract: The emitting materials with thermally activated delayed fluorescence (TADF) characteristics is a new generation of light-emitting materials with high quantum yield, which can convert the triplet state of molecules into the singlet state by absorbing heat in the environment. They have a wide application prospect in organic light-emitting diode (OLED). Donor-acceptor (D-A) type pure organic molecules as a kind of TADF molecules have drawn significant attention. Carbazole as an excellent donor unit is often be selected to form D-A type TADF molecules. Because it is easy to be modifed by different substituent groups, and is also easy to combine with different electron acceptor units. The complexes containing carbazole derivative have a small energy level difference between the lowest triplet and singlet (ΔEST). In addition, theoretical calculation plays an important role in studying TADF properties of carbazole derivatives and predicting their performance in OLED. In this paper, D-A type TADF molecules based on different carbazole donors are reviewed. According to the different substituents on carbazole molecules, the structural characteristics and luminescence efficiency of various TADF molecules in recent five years are summarized, as well as their performance in device application. The factors that may change the properties of D-A type TADF are also discussed combined with the results of theoretical calculation. It provides valuable reference for researchers to design and synthesize new TADF molecules with better performance in the future.
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