Multicolored‐Fluorescence Switching of ICT‐Type Organic Solids with Clear Color Difference: Mechanically Controlled Excited State
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- 13 November 2014
- journal article
- research article
- Published by Wiley in Chemistry – A European Journal
- Vol. 21 (6), 2474-2479
- https://doi.org/10.1002/chem.201405348
Abstract
A donor–acceptor-type fluorophore containing a twisted diphenylacrylonitrile and triphenylamine has been developed by using the Suzuki reaction. The system indicates typical intramolecular charge-transfer properties. Upon mechanical grinding or hydrostatic pressure, the fluorophore reveals a multicolored fluorescence switching. Interestingly, a fluorescence color transition from green to red was clearly observed, and the change of photoluminescent (PL) wavelength gets close to 111 nm. The mechanisms of high-contrast mechanochromic behavior are fully investigated by techniques including powder XRD, PL lifetime, high-pressure PL lifetime, and Raman spectra analysis. The tremendous PL wavelength shift is attributed to gradual transition of excited states from the local excited state to the charge-transfer state.Keywords
Funding Information
- National Basic Research Program of China (2011CBA00700)
- National Natural Science Foundation of China (51403060, 51203138, 51273179, 11204101, 21101137, 91227202)
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