Mechanical Force-Induced Blue-Shifted and Enhanced Emission for AIEgens

Mechanochromic (MC) luminescence of organic molecules has been emerging as a promising smart material for optical recording and memory devices. At the same time, pressure-induced blue-shifted and enhanced luminescence are rarely reported now. Herein, a series of cyanostilbene-based AIEgens with diff...

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Bibliographic Details
Published in:Biosensors (Basel) 2022-11, Vol.12 (11), p.1055
Main Authors: Guo, Chang-Sheng, Su, Xiao-Long, Yin, Yu-Ting, Zhang, Bo-Xuan, Liu, Xin-Yi, Wang, Rui-Peng, Chen, Pu, Feng, Hai-Tao, Tang, Ben-Zhong
Format: Article
Language:English
Subjects:
aggregation-induced emission
Analysis
blue-shift
Crystal structure
Crystals
Cyano groups
cyanostilbene
Diffraction patterns
enhanced emission
Fluorescence
Health aspects
Luminescence
Mechanical stimuli
mechanochromic luminescence
Mechanoluminescence
Memory devices
Morphology
Optical memory (data storage)
Organic chemistry
Photoluminescence
Radiation
Smart materials
Stimuli (Psychology)
Structure
X ray powder diffraction
X-ray diffraction
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Summary:Mechanochromic (MC) luminescence of organic molecules has been emerging as a promising smart material for optical recording and memory devices. At the same time, pressure-induced blue-shifted and enhanced luminescence are rarely reported now. Herein, a series of cyanostilbene-based AIEgens with different substituents were synthesized to evaluate the influence of morphology transformation and push-pull electronic effect on the MC luminescence. Among these luminophores, compound 1 with one cyano group and diethylamino group was more susceptible to mechanical stimuli and obtained blue-shifted and enhanced fluorescence in response to anisotropic grinding. Powder X-ray diffraction patterns indicated that the MC behaviors were ascribed to the solid-state morphology transition from crystal-to-crystal. Analysis of crystal structures revealed that loose molecular packing is a key factor for high high-contrast MC luminescence. The smart molecular design, together with the excellent performance, verified that luminophores with twisted structures are ideal candidates for MC luminogens.
ISSN:2079-6374
2079-6374
DOI:10.3390/bios12111055