https://scholars.lib.ntu.edu.tw/handle/123456789/637485
Title: | Entropy-driven charge-transfer complexation yields thermally activated delayed fluorescence and highly efficient OLEDs | Authors: | Lin, Chun-Yen Hsu, Chao-Hsien Hung, Chieh-Ming Wu, Chi-Chi Liu, Yi-Hung Shi, Emily Hsue-Chi Lin, Tse-Hung Hu, Yuan-Cheng Hung, Wen-Yi KEN-TSUNG WONG PI-TAI CHOU |
Issue Date: | 26-Oct-2023 | Source: | Nature chemistry | Abstract: | Exciplex-forming systems that display thermally activated delayed fluorescence are widely used for fabricating organic light-emitting diodes. However, their further development can be hindered through a lack of structural and thermodynamic characterization. Here we report the generation of inclusion complexes between a cage-like, macrocyclic, electron-accepting host (A) and various N-methyl-indolocarbazole-based electron-donating guests (D), which exhibit exciplex-like thermally activated delayed fluorescence via a through-space electron-transfer process. The D/A cocrystals are fully resolved by X-ray analyses, and UV-visible titration data show their formation to be an endothermic and entropy-driven process. Moreover, their emission can be fine-tuned through the molecular orbitals of the donor. Organic light-emitting diodes were fabricated using one of the D/A systems, and the maximum external quantum efficiency measured was 15.2%. An external quantum efficiency of 10.3% was maintained under a luminance of 1,000 cd m-2. The results show the potential of adopting inclusion complexation to better understand the relationships between the structure, formation thermodynamics and properties of exciplexes. |
URI: | https://scholars.lib.ntu.edu.tw/handle/123456789/637485 | ISSN: | 17554330 | DOI: | 10.1038/s41557-023-01357-0 |
Appears in Collections: | 化學系 |
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