journal article·2023-03

Harvesting Triplet Excitons in High Mobility Emissive Organic Semiconductor for Efficiency Enhancement of Light‐Emitting Transistors

Can Gao, Atul Shukla, Haikuo Gao, Zhagen Miao, Yihan Zhang, Pu Wang, Guiwen Luo, Yi Zeng, Wallace W. H. Wong, Trevor A. Smith, Shih‐Chun Lo, Wenping Hu, Ebinazar B. Namdas, Huanli Dong

Advanced Materials· Volume 35· Issue 13
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Abstract

Abstract Organic light‐emitting transistors (OLETs), a kind of highly integrated and minimized optoelectronic device, demonstrate great potential applications in various fields. The construction of high‐performance OLETs requires the integration of high charge carrier mobility, strong emission, and high triplet exciton utilization efficiency in the active layer. However, it remains a significant long‐term challenge, especially for single component active layer OLETs. Herein, the successful harvesting of triplet excitons in a high mobility emissive molecule, 2,6‐diphenylanthracene (DPA), through the triplet‐triplet annihilation process is demonstrated. By incorporating a highly emissive guest into the DPA host system, an obvious increase in photoluminescence efficiency along with exciton utilization efficiency results in an obvious enhancement of external quantum efficiency of 7.2 times for OLETs compared to the non‐doped devices. Moreover, well‐tunable multi‐color electroluminescence, especially white emission with Commission Internationale del'Eclairage of (0.31, 0.35), from OLETs is also achieved by modulating the doping concentration with a controlled energy transfer process. This work opens a new avenue for integrating strong emission and efficient exciton utilization in high‐mobility organic semiconductors for high‐performance OLETs and advancing their related functional device applications.
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Research context

OpenAlex topics: Organic Light-Emitting Diodes Research · Organic Electronics and Photovoltaics · Luminescence and Fluorescent Materials

SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.

Affiliations

Beijing National Laboratory for Molecular Sciences Key Laboratory of Organic Solids Institute of Chemistry Chinese Academy of Sciences Beijing 100190 China

Centre for Organic Photonics & Electronics School of Mathematics and Physics The University of Queensland Brisbane QLD 4072 Australia

Shandong Engineering Research Center of Aeronautical Materials and Devices College of Aeronautical Engineering Binzhou University Binzhou 251900 China

School of Chemical Science University of Chinese Academy of Sciences Beijing 100049 China

Key Laboratory of Photochemical Conversion and Optoelectronic Materials Technical Institute of Physics and Chemistry Chinese Academy of Sciences Beijing 100190 China

ARC Centre of Excellence in Exciton Science School of Chemistry Bio21 Institute The University of Melbourne Melbourne VIC 3010 Australia

ARC Centre of Excellence in Exciton Science School of Chemistry The University of Melbourne Melbourne VIC 3010 Australia

Centre for Organic Photonics and Electronics School of Chemistry and Molecular Biosciences The University of Queensland Brisbane QLD 4072 Australia

Tianjin Key Laboratory of Molecular Optoelectronic Science Department of Chemistry School of Science Tianjin University Tianjin 300072 China

Funding

National Natural Science Foundation of China · Youth Innovation Promotion Association of the Chinese Academy of Sciences

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