https://scholars.lib.ntu.edu.tw/handle/123456789/639990
標題: | High-Efficiency Near-Infrared OLED Enabled by Exciplex-Forming Hosts and a New Organic Fluorescent Emitter | 作者: | Chen, Yi Yun Kung, Yu Cheng Wang, Miaosheng Lo, Yuan Chih Chia, Yao Te Wang, Chun Kai Chen, Deng Gao Cheng, Ju Ting PI-TAI CHOU Wu, Chichi Li, Elise Y. Hu, Bin Hung, Wen Yi KEN-TSUNG WONG |
關鍵字: | exciplex | intermolecular charge transfer | near-infrared | thermally activated delayed fluorescence | 公開日期: | 1-一月-2024 | 來源出版物: | Advanced Optical Materials | 摘要: | Two blends comprising new dicyanopyrazine-based acceptors (m-CN and p-CN) and a carbazole-based donor CPTBF are explored for exciplex formation. The CPTBF:m-CN and CPTBF:p-CN blends show the signature red-shifted emission together with the delayed fluorescence observed in time-resolved measurement, manifesting the characteristics of thermally activated delayed fluorescence (TADF). The electroluminescence (EL) device employing CPTBF:m-CN (CPTBF:p-CN) blend as the emitting layer (EML) achieved an EQE of 5.22% (2.05%) with the EL λmax centered at 607 nm (625 nm). The exciplex excitons can be efficiently extracted by a new benzobisthiadiazole-based near-infrared (NIR) emitter DCzPBBT, where a device is configured with CPTBF:m-CN: (5 wt.%) DCzPBBT as the EML to achieve a high EQE of 5.32% and an EL λmax 758 nm. Further increase of the doping concentration to 10 wt.% of DCzPBBT exhibits a bathochromic shifted EL λmax to 772 nm with 94% spectral coverage in the NIR (>700 nm) region, while the device EQE retains at 4.06%. The superior device performance stems from the highly efficient energy transfer between the exciplex-forming host and NIR dopant together. |
URI: | https://scholars.lib.ntu.edu.tw/handle/123456789/639990 | ISSN: | 2195-1071 | DOI: | 10.1002/adom.202303131 |
顯示於: | 化學系 |
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