DataVXACS Applied Materials & InterfacesPaper
journal article·2017-03-15

Coumarin-Based Thermally Activated Delayed Fluorescence Emitters with High External Quantum Efficiency and Low Efficiency Roll-off in the Devices

Jia-Xiong Chen, Wei Liu, Cai-Jun Zheng, Kai Wang, Ke Liang, Yi-Zhong Shi, Xue-Mei Ou, Xiao-Hong Zhang

ACS Applied Materials & Interfaces· Volume 9· Issue 10
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Source abstract

Abstract

Thermally activated delayed fluorescence (TADF) emitters have attracted much interest for their great applications in organic light-emitting diodes (OLEDs), but the TADF OLEDs are limited by large efficiency roll-offs. In this study, we report two coumarin-based TADF emitters, 3-methyl-6-(10 H -phenoxazin-10-yl)-1 H -isochromen-1-one (PHzMCO) and 9-(10 H -phenoxazin-10-yl)-6 H -benzo[ c ]chromen-6-one (PHzBCO), with relatively high photoluminescence quantum yields (PLQYs) and extremely small singlet–triplet splittings. OLEDs using these two TADF compounds as the emitters respectively demonstrate high external quantum efficiencies of 17.8% for PHzMCO and 19.6% for PHzBCO, which are the highest among the reported coumarin-derivative-based OLEDs. More importantly, these devices based on PHzMCO and PHzBCO remained 10.3% and 12.9% at 10000 cd m –2, respectively, showing relatively low efficiency roll-offs at high brightness. These results reveal that the TADF emitters with high PLQYs can effectively reduce the efficiency roll-off in the devices.
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Research context

OpenAlex topics: Organic Light-Emitting Diodes Research · Organic Electronics and Photovoltaics · Thin-Film Transistor Technologies

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

Affiliations

Jiangsu Key Laboratory for Carbon-Based Functional Materials & Devices, Institute of Functional Nano & Soft Materials, Soochow University, Suzhou, Jiangsu 215123, P. R. China

Nano-organic Photoelectronic Laboratory and Key Laboratory of Photochemical Conversion and Optoelectronic Materials, Technical Institute of Physics and Chemistry, Chinese Academy of Sciences, Beijing 100190, P. R. China

College of Materials Science and Engineering, Beijing Institute of Technology, Beijing 100081, P. R. China

School of Optoelectronic Information, University of Electronic Science and Technology of China, Chengdu 610054, P. R. China

Funding

Ministry of Science and Technology of the People's Republic of China · Natural Science Foundation of Jiangsu Province · National Natural Science Foundation of China · Beijing Nova Program · Jiangsu Province · Collaborative Innovation Center of Suzhou Nano Science and Technology · Priority Academic Program Development of Jiangsu Higher Education Institutions

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