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

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Solid-State Fluorophore Based on π-Extended Heteroaromatic Acceptor: Polymorphism, Mechanochromic Luminescence, and Electroluminescence
Crystal Growth & Design ( IF 3.2 ) Pub Date : 2020-03-05 , DOI: 10.1021/acs.cgd.9b01630
Bin Huang _{1,

2} , Xiaomin Gu ₁ , Yan Feng ₁ , Ying Zhang ₁ , Dawei Jiang ₁ , Wen-Cheng Chen _{2,

3} , Gu Dai ₁ , Yigang Ji ₁ , Qiang Zhao ₁ , Chun-Sing Lee ₂

Affiliation

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 (Φ_PL ≈ 1) and obvious MCL property, while the compactly packed O-crystal shows a lower Φ_PL 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.

中文翻译：

基于π-扩展的杂环芳香族受体的固态荧光团：多态性，机械变色发光和电致发光

合成并表征了新型发光材料4-（4-二苯基氨基苯基）-苯并[ d，e ]苯并[4,5]咪唑并[2,1 - a ]异喹啉-7-一（4-TPA-BBI）。4-TPA-BBI具有出色的多态性，机械致变色发光（MCL）和电致发光特性。它可以形成三种不同的聚集体种类：黄色棒状晶体（Y晶体），橙色针状晶体（O晶体）和红色固体（R固体）。观察到，在外部刺激下Y晶体可以可逆地变成R-固体，而在真空下通过升华O晶体可以不可逆地变成R-固体。晶体学和光物理研究表明，具有疏松分子堆积的Y晶体显示出高的光致发光量子产率（Φ_PL ≈1）和明显的MCL属性，而紧凑地填充O型结晶表现出较低的Φ _PL的0.646具有可忽略的MCL。基于4-TPA-BBI作为发射器的非掺杂发光器件表现出亮橙色发射，其峰值位于588 nm，外部量子效率高达4.4％，最大亮度为22470 cd m ^-2。

更新日期：2020-04-23

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