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Triboluminescence of a New Family of CuI-NHC Complexes in Crystalline Solid and in Amorphous Polymer Films

preprint
submitted on 28.07.2020 and posted on 29.07.2020 by Ayumu Karimata, Pradnya Patil, Robert Fayzullin, Eugene Khaskin, Sébastien Lapointe, Julia Khusnutdinova
Triboluminescent compounds that generate emission of light in response to mechanical stimulus are promising targets in the development of “smart materials” and damage sensors. Among triboluminescent metal complexes, rare-earth europium and terbium complexes are most widely used, while there is no systematic data on more readily available and inexpensive Cu complexes. We report a new family of photoluminescent Cu-NHC complexes that show bright triboluminescence (TL) in the crystal state visible in ambient indoor light under air. Moreover, when these complexes are blended into amorphous polymer films even at small concentrations, TL is easily observed. Observation of TL in polymer films overcomes the limitation of using crystals and opens up possibilities for the development of mechanoresponsive coatings and materials based on inexpensive metals such as Cu. Our results may also have implications for the understanding of the TL effect’s origin in polymer films.

Funding

JSPS KAKENHI Grant Number JP18K05247

History

Email Address of Submitting Author

juliak@oist.jp

Institution

Okinawa Institute of Science and Technology Graduate University

Country

Japan

ORCID For Submitting Author

0000-0002-5911-4382

Declaration of Conflict of Interest

The authors declare no conflict of interest

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