A novel triphenylacrylonitrile based AIEgen for high contrast mechanchromism and bicolor electroluminescence. Issue 2 (2nd January 2018)

• Record Type: Journal Article
• Authors: Hu, Jiayou; Jiang, Bingli; Gong, Yongyang; Liu, Yuanli; He, Gang; Yuan, Wang Zhang; Wei, Chun
• Is Part Of: RSC advances. Volume 8:Issue 2(2018)
• Page Start: 710
• Page End: 716
• Publication Date: 2018-01-02
• Subjects: Chemistry -- Periodicals; 540.5
• DOI: 10.1039/c7ra10174k
• Languages: English
• ISSNs: 2046-2069

Abstract

Abstract : An AIE luminogen with high contrast mechanochromic and bicolor electroluminescence. Abstract : A novel thermally stable and aggregation-induced emission (AIE) active compound, 2, 2'-(([1, 1′-biphenyl]-4, 4′-diylbis(phenylazanediyl))bis(4, 1-phenylene))bis(3, 3-diphenylacrylonitrile) (BP2TPAN) was synthesized through a C–N coupling reaction between 2-(4-bromophenyl)-3, 3-diphenylacrylonitrile (Br-TPAN) and N, N ′-diphenyl-1, 4-phenylenediamine, under mild conditions using Pd(OAc)2 and P( t -Bu)3 as a catalyst. The BP2TPAN was characterized by nuclear magnetic resonance spectroscopy, high resolution mass spectrometry and elemental analysis. The thermal analysis showed that the glass transition and decomposition temperatures (5% weight loss) are 96 and 414 °C, respectively. The fluorescent emission peaks changes at 540 and 580 nm upon grinding were attributed to a transformation from crystal to amorphous occurring by altering the condensed state. The photoluminescence quantum yield and fluorescence lifetime of the as prepared and ground samples were 74.3 and 8.4%, 3.4 and 5.1 ns, respectively. The difference of the luminous efficiency of before and after grinding samples indicates BP2TPAN has a high contrast more importantly, both doped and nondoped OLED devices emit different color, the doped one is highly efficient and its L max, CEmax, PEmax and EQE are up to 15 070 cd m −2, 11.0 cd A −1, 7.5 lm W −1, and 3.1%, respectively.