Twisted donor–acceptor molecules for efficient deep blue electroluminescence with CIEy ∼ 0.06. Issue 27 (23rd June 2020)

• Record Type: Journal Article
• Authors: Shen, Ziqiu; Zhu, Xiangyu; Tang, Weiguo; Feng, Xin Jiang; Zhao, Zujin; Lu, Hua
• Is Part Of: Journal of materials chemistry. Volume 8:Issue 27(2020)
• Page Start: 9401
• Page End: 9409
• Publication Date: 2020-06-23
• Subjects: Materials -- Periodicals; Chemistry, Analytic -- Periodicals; Optical materials -- Research -- Periodicals; Electronics -- Materials -- Research -- Periodicals; 543.0284
• DOI: 10.1039/d0tc01705a
• Languages: English
• ISSNs: 2050-7526

Abstract

Abstract : Terphenyl conjugated twisted molecules can be served as deep blue emitters for efficient electroluminescence. 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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 CIE x, y of (0.162, 0.061).