Twisted donor–acceptor molecules for efficient deep blue electroluminescence with CIEy ∼ 0.06
| Autor: | Weiguo Tang, Zujin Zhao, Ziqiu Shen, Xiangyu Zhu, Hua Lu, Xin Jiang Feng |
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| Rok vydání: | 2020 |
| Předmět: | |
| Zdroj: | Journal of Materials Chemistry C. 8:9401-9409 |
| ISSN: | 2050-7534 2050-7526 |
| Popis: | Blue luminescent materials for organic light-emitting diodes (OLEDs) are crucial for full-color displays and white-lighting. However, challenges remain in high color purity and efficiency of blue emitters. Herein, two highly twisted D–A molecules, using bistrimethylsilyl as the steric hindrance group and PO as the electron-withdrawing unit as well as a further distorting molecular structure, are designed. The resulting molecules have high thermal stability and exhibit strong luminescence with a quantum yield as high as 1.0. The solvatochromism study and time-dependent density functional theory (TD-DFT) calculations indicate that the molecules exhibit twisted intramolecular charge transfer (TICT) characteristics. Non-doped OLEDs based on the new twisted molecules display an external quantum efficiency of 2.70% and a narrow deep blue electroluminescence (EL) emission with a full width at half maximum (FWHM) of 48 nm and CIEx,y of (0.162, 0.061). |
| Databáze: | OpenAIRE |
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