Very bright mechanoluminescence and remarkable mechanochromism using a tetraphenylethene derivative with aggregation-induced emission

Abstract

Two photoluminescent polymorphs exhibit different mechanoluminescence activities and mechanochromic behaviors.

Influence of Aggregation on the Structure and Fluorescent Properties of a Tetraphenylethylene Derivative: a Theoretical Study

“…[13] This could be ascribed to the huge underestimation of charge transfer transition energy resulted from one defect that, only single excitation is taken into account in TDDFT calculation. For the isolated molecules, large bathochromic shifts about 100 nm take place in absorption and emission spectra compared with the experiment measurement in which the absorptiona nd emission peaks, respectively locate at 366 nm and 513 nm.…”

“…For the isolated molecules, large bathochromic shifts about 100 nm take place in absorption and emission spectra compared with the experiment measurement in which the absorptiona nd emission peaks, respectively locate at 366 nm and 513 nm. [13] Since the organic molecules with conformational flexibility are more likely to form polymorphs, [23] propera ddition of rotatable moietiesi s helpful to enrich the crystal configurations and to attain colortunable luminescent materials in the designo fA IE molecules. [22] For the monomers in the crystals, B1 and B2 from SC b have blue-shifted absorption and emission peaks compared to the monomers from SC g and the cluster,w hich is in agreement with the above structural analyses and the experimental data (the measured absorption and emission peaks, respectively at 367 nm and 476 nm for SC b crystals, respectively at 373 nm and 499 nm for SC g crystals).…”

Dynamic Triboelectrification‐Induced Electroluminescence and its Use in Visualized Sensing

“…A pen-like object is used to rub the electrifi cation layer, while an optic-fi ber probe is in close proximity to the back of the substrate. [ 8 ] Distinct types of stimuli yield corresponding important applications that cover a wide spectrum of areas including lighting, [ 9,10 ] displays, [ 11 ] disinfection, [ 12 ] medical imaging, [ 13,14 ] and horticulture. The object and the probe are simultaneously driven by a linear stepper in a horizontal plane.…”

Progress of Research on Organic/Organometallic Mechanoluminescent Materials

“…相比较于其它类型发光材料, 力致发光 材料因具有外力作用诱导产生发光的独特性质, 即可以 将机械能转化为光能的特殊性质, 其对冲击力、张力或 压力等应力作用具有敏感的光学响应, 因此这类材料在 应力传感、 显示、 照明、 成像等领域备受关注 [17,37～41] . 早 在 1605 年, Bacon 用刀刮方块糖时首次发现了 ML 现 象 [17,39,42] . 1888 年 Krafft 发现十五烷基对甲苯基酮具有 ML 现象 [43] .…”

“…近年 来, 有机/金属有机力致发光材料因其种类繁多、可修饰 性强等优点而备受关注. 人们通常认为有机/金属有机 ML 材料一般具有非中心对称结构和压电性质, 然而其 发光机理尚不明确 [22,39,46,47] , 从而导致该领域发展缓慢.…”