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Piezochromic Carbon Dots with Two‐photon Fluorescence
Author(s) -
Lu Siyu,
Xiao Guanjun,
Sui Laizhi,
Feng Tanglue,
Yong Xue,
Zhu Shoujun,
Li Baojun,
Liu Zhongyi,
Zou Bo,
Jin Mingxing,
Tse John S.,
Yan Hu,
Yang Bai
Publication year - 2017
Publication title -
angewandte chemie
Language(s) - English
Resource type - Journals
eISSN - 1521-3757
pISSN - 0044-8249
DOI - 10.1002/ange.201700757
Subject(s) - luminescence , fluorescence , materials science , carbon fibers , quenching (fluorescence) , grinding , optoelectronics , nanotechnology , photochemistry , chemistry , optics , composite material , composite number , physics
Piezochromic materials, which show color changes resulting from mechanical grinding or external pressure, can be used as mechanosensors, indicators of mechano‐history, security papers, optoelectronic devices, and data storage systems. A class of piezochromic materials with unprecedented two‐photon absorptive and yellow emissive carbon dots (CDs) was developed for the first time. Applied pressure from 0–22.84 GPa caused a noticeable color change in the luminescence of yellow emissive CDs, shifting from yellow (557 nm) to blue‐green (491 nm). Moreover, first‐principles calculations support transformation of the sp 2 domains into sp 3 ‐hybridized domains under high pressure. The structured CDs generated were captured by quenching the high‐pressure phase to ambient conditions, thus greatly increasing the choice of materials available for a variety of applications.