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Twisted donor–acceptor molecules for efficient deep blue electroluminescence with CIEy ∼ 0.06

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Abstract

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 P[double bond, length as m-dash]O 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).

Graphical abstract: Twisted donor–acceptor molecules for efficient deep blue electroluminescence with CIEy ∼ 0.06

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Article information


Submitted
04 Apr 2020
Accepted
08 Jun 2020
First published
10 Jun 2020

J. Mater. Chem. C, 2020, Advance Article
Article type
Paper

Twisted donor–acceptor molecules for efficient deep blue electroluminescence with CIEy ∼ 0.06

Z. Shen, X. Zhu, W. Tang, X. J. Feng, Z. Zhao and H. Lu, J. Mater. Chem. C, 2020, Advance Article , DOI: 10.1039/D0TC01705A

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