Solid-State Fluorophore Based on π-Extended Heteroaromatic Acceptor : Polymorphism, Mechanochromic Luminescence, and Electroluminescence

Research output: Journal Publications and ReviewsRGC 21 - Publication in refereed journalpeer-review

15 Scopus Citations
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Author(s)

  • Bin Huang
  • Xiaomin Gu
  • Yan Feng
  • Ying Zhang
  • Dawei Jiang
  • Gu Dai
  • Yigang Ji
  • Qiang Zhao

Detail(s)

Original languageEnglish
Pages (from-to)2454-2461
Journal / PublicationCrystal Growth and Design
Volume20
Issue number4
Online published5 Mar 2020
Publication statusPublished - 1 Apr 2020

Abstract

A novel light-emitting material 4-(4-diphenylaminophenyl)-benzo[d,e]benzo[4,5]imidazo[2,1-a]isoquinolin-7-one (4-TPA-BBI) is synthesized and characterized. 4-TPA-BBI exhibits excellent polymorphism, mechanochromic luminescence (MCL), and electroluminescence properties. It can form three different aggregate species: yellow rod-like crystal (Y-crystal), orange needle-like crystal (O-crystal), and red solid (R-solid). It is observed that the Y-crystal can be reversibly changed to R-solid upon external stimuli, while O-crystal can be irreversibly transformed to R-solid via sublimation under a vacuum. Crystallographic and photophysical studies indicate that the Y-crystal featuring loose molecular packing demonstrates a high photoluminescence quantum yield (φPL ≈ 1) and obvious MCL property, while the compactly packed O-crystal shows a lower φPL of 0.646 with negligible MCL. A nondoped light-emitting device based on 4-TPA-BBI as an emitter exhibits bright orange emission with a peak at 588 nm, a high external quantum efficiency of 4.4%, and a maximum luminance of 22470 cd m-2

Citation Format(s)

Solid-State Fluorophore Based on π-Extended Heteroaromatic Acceptor: Polymorphism, Mechanochromic Luminescence, and Electroluminescence. / Huang, Bin; Gu, Xiaomin; Feng, Yan et al.
In: Crystal Growth and Design, Vol. 20, No. 4, 01.04.2020, p. 2454-2461.

Research output: Journal Publications and ReviewsRGC 21 - Publication in refereed journalpeer-review