Solid-State Fluorophore Based on π-Extended Heteroaromatic Acceptor : Polymorphism, Mechanochromic Luminescence, and Electroluminescence
Research output: Journal Publications and Reviews › RGC 21 - Publication in refereed journal › peer-review
Author(s)
Related Research Unit(s)
Detail(s)
Original language | English |
---|---|
Pages (from-to) | 2454-2461 |
Journal / Publication | Crystal Growth and Design |
Volume | 20 |
Issue number | 4 |
Online published | 5 Mar 2020 |
Publication status | Published - 1 Apr 2020 |
Link(s)
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.
In: Crystal Growth and Design, Vol. 20, No. 4, 01.04.2020, p. 2454-2461.
Research output: Journal Publications and Reviews › RGC 21 - Publication in refereed journal › peer-review