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Issue 22, 2017
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Enhanced piezoluminescence in non-stoichiometric ZnS:Cu microparticle based light emitting elastomers

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Abstract

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

Graphical abstract: Enhanced piezoluminescence in non-stoichiometric ZnS:Cu microparticle based light emitting elastomers

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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, 2017,5, 5387-5394
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    Enhanced piezoluminescence in non-stoichiometric ZnS:Cu microparticle based light emitting elastomers

    J. Gan, M. G. Kang, M. A. Meeker, G. A. Khodaparast, R. J. Bodnar, J. E. Mahaney, D. Maurya and S. Priya, J. Mater. Chem. C, 2017, 5, 5387
    DOI: 10.1039/C7TC01146F

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