A methyl-shield strategy enables efficient blue thermally activated delayed fluorescence hosts for high-performance fluorescent OLEDs
| Autor: | Weiguo Han, Ge Gao, Jingsong You, Zhengyang Bin, Rongchuan Su, You Ran, Ge Yang, Yang Liu |
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| Rok vydání: | 2021 |
| Předmět: |
Materials science
Quenching (fluorescence) Process Chemistry and Technology Exciton Stacking 02 engineering and technology 010402 general chemistry 021001 nanoscience & nanotechnology Photochemistry 01 natural sciences Acceptor Fluorescence 0104 chemical sciences chemistry.chemical_compound chemistry Mechanics of Materials OLED Molecule General Materials Science Electrical and Electronic Engineering 0210 nano-technology Methyl group |
| Zdroj: | Materials Horizons. 8:2025-2031 |
| ISSN: | 2051-6355 2051-6347 |
| Popis: | Here, we report a novel methyl-shield strategy to design ideal TADF hosts for the improvement of the performance of TSF-OLEDs. The methyl group on the xanthone acceptor acts like a shield to protect the luminance center from close intermolecular hydrogen bonding with adjacent molecules, thus alleviating exciton quenching, and meanwhile the small size of the methyl group almost does not disturb the π-π stacking between acceptors, thus maintaining fast electron-transport pathways. dMeACRXTO having two methyl shields is exploited as the host to achieve a record-high EQE of 32.3%, which represents the first report of an EQE above 30% in TSF-OLEDs. |
| Databáze: | OpenAIRE |
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