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Enhanced piezoluminescence in non-stoichiometric ZnS:Cu microparticles based light emitting elastomers

Abstract

Piezoluminescence (PZL), also referred as mechanoluminescence (ML), is a promising energy conversion mechanism for realizing mechanically driven photon sources including hand-held displays, lighting, bioimaging and sensing. However, realization of visible PZL intensity at room temperature from low mechanical stresses has been fundamentally challenging. Herein, we demonstrate PZL elastomer exhibiting significantly enhanced brightness in ambient conditions. The elastomer consisted of defect-engineered non-stoichiometric Cu-doped ZnS (ZnS:Cu) microparticles and polydimethylsiloxane (PDMS) matrix. The role of defect structure was found to be controlling parameter in the nature of PZL emission. Hydrogenation treatment was designed to induce controlled concentration of sulfur vacancies that provide trapped electrons which has a strong correlation with the PZL performance of ZnS:Cu. An optimum electron concentration is necessary in order to maximize the PZL intensity due to adequate electron energy transfer ratio between non-radiative recombination (NRR) and thermal radiative recombination (TRR). The light emitting elastomer with optimum content of PZL particles maximizes the stress-mediated electroluminescence-piezoelectric coupling enabling visible PZL brightness under the indoor light.

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Publication details

The article was received on 17 Mar 2017, accepted on 12 May 2017 and first published on 12 May 2017


Article type: Paper
DOI: 10.1039/C7TC01146F
Citation: J. Mater. Chem. C, 2017, Accepted Manuscript
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    Enhanced piezoluminescence in non-stoichiometric ZnS:Cu microparticles based light emitting elastomers

    J. Gan, M. Kang, M. A. Meeker, G. Khodaparast, R. J. Bodnar, J. E. Mahaney, D. Maurya and S. Priya, J. Mater. Chem. C, 2017, Accepted Manuscript , DOI: 10.1039/C7TC01146F

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