Efficient and Bright Blue Thermally Activated Delayed Fluorescence from Light-Emitting Electrochemical Cells

Shi Tang; Petter Lundberg; Youichi TsuchiyaJoan Rafols-RibeYongfeng LiuJia WangChihaya AdachiLudvig Edman

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Efficient and Bright Blue Thermally Activated Delayed Fluorescence from Light-Emitting Electrochemical Cells

机译：Efficient and Bright Blue Thermally Activated Delayed Fluorescence from Light-Emitting Electrochemical Cells

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Light-emitting electrochemical cells (LECs) comprising metal-free molecules that emit by the process of thermally activated delayed fluorescence (TADF) can be both sustainable and low cost. However, the blue emission performance of current TADF-LECs is unfortunately poor, which effectively prohibits their utilization in important applications, such as illumination and full-color displays. Here, this drawback is addressed through the development of a TADF-LEC, which delivers blue light emission (peak wavelength = 475 nm) with a high external quantum efficiency of 5.0, corresponding to a current efficacy of 9.6 cd A~(-1). It is notable that this high efficiency is attained at bright luminance of 740 cd m~(-2), and that the device turn-on is very fast. It is demonstrated that this accomplishment is enabled by the blending of a carbazole-based 9-(4-(4,6-diphenyl-1,3,5-triazin-2-yl)-2- methylphenyl)-3,6-dimethyl-9H-carbazole guest emitter with a compatible carbazole-based tris(4-carbazoyl-9-ylphenyl)amine:2,6-bis(3-(carbazol-9-yl) phenyl)pyridine blend-host for the attainment of bipolar electrochemical doping, balanced electron/hole transport, and exciplex-effectuated host-toguest energy transfer.

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来源
《Advanced functional materials》 |2022年第44期|2205967.1-2205967.11|共11页
作者
Shi Tang; Petter Lundberg; Youichi TsuchiyaJoan Rafols-RibeYongfeng LiuJia WangChihaya AdachiLudvig Edman;
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The Organic Photonics and Electronics Group Department of Physics Umea University Umea SE-90187, Sweden,LunaLEC AB Linnaeus vaeg 24, Umea SE-90187, Sweden;

The Organic Photonics and Electronics Group Department of Physics Umea University Umea SE-90187, Sweden;

Center for Organic Photonics and Electronics Research (OPERA) Kyushu University 744 Motooka, Nishi-ku, Fukuoka 819-0395, JapanThe Organic Photonics and Electronics Group Department of Physics Umea University Umea SE-90187, Sweden,College of Physical Science and Technology & Microelectronics Industry Research Institute Yangzhou University Yangzhou 225002, P. R. China;

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正文语种英语
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blend host; blue emission; high efficiency; light-emitting electrochemical cells; thermally activated delayed fluorescence;

Efficient and Bright Blue Thermally Activated Delayed Fluorescence from Light-Emitting Electrochemical Cells

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