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Progress in Chemistry 2016, Vol. 28 Issue (12): 1811-1823 DOI: 10.7536/PC160520 Previous Articles   Next Articles

• Review and comments •

Thermally Activated Delayed Fluorescence Materials Based on Donor-Acceptor Structures

Jiang He1, Jin Jibiao1, Chen Runfeng1*, Zheng Chao1, Huang Wei1,2*   

  1. 1. Key Laboratory for Organic Electronics and Information Displays & Institute of Advanced Materials, Jiangsu National Synergetic Innovation Center for Advanced Materials, Nanjing University of Posts & Telecommunications, Nanjing 210023, China;
    2. Key Laboratory of Flexible Electronics & Institute of Advanced Materials, Jiangsu National Synergetic Innovation Center for Advanced Materials, Nanjing Tech University, Nanjing 211816, China
  • Received: Revised: Online: Published:
  • Supported by:
    The work was supported by the National Natural Science Foundation of China (No. 21274065, 21304049).
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Thermally activated delayed fluorescence (TADF) materials, capable of efficient reverse intersystem crossing (RISC) from the lowest triplet excited state (T1) to the lowest singlet excited state (S1) to use triplet excitons for photoluminescence with theoretically 100% exciton harvesting in emission, have attracted great attention in recent research of organic electronics, especially in the field of organic light emitting diodes (OLEDs). The singlet-triplet energy splitting (ΔEST) between S1 and T1 should be low, which is a key point to facilitate the RISC process in tuning triplet excitons to singlet excitons for delayed fluorescence emission. With the significant advantages of convenient molecular design, easy preparation, rich optoelectronic properties, and excellent device performance, TADF materials with donor-acceptor (D-A) molecular structures are of central importance in the current development of high-performance TADF molecules. In this article, we review the basic molecular design principles of the D-A type TADF materials and summarize their molecular structure characteristics, optoelectronic properties and device application performance in the latest research progress, according to the varied types of acceptor building blocks. Finally, the existing problems, future opportunities and key challenges of TADF materials with D-A architectures are discussed to give a full view of this kind of new organic optoelectronic materials.

Contents
1 Introduction
2 Basic principles of TADF materials and applications
3 Molecular design of D-A type TADF materials
4 Intramolecular D-A type TADF molecules
4.1 Cyano-based TADF molecules
4.2 Nitrogen heterocycle-based TADF molecules
4.3 Diphenyl sulfoxide-based TADF molecules
4.4 Diphenyl ketone-based TADF molecules
4.5 10H-Phenoxaborin-based TADF molecules
5 Intermolecular D-A type TADF materials
6 D-A type TADF polymers
7 Conclusion

Key words: donor-acceptor architecture, thermally activated delayed fluorescence, organic light-emitting diodes

CLC Number: 

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