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

Jiayong Gan, Min Gyu Kang, Michael A. Meeker, Giti A. Khodaparast, Robert J. Bodnar, James E. Mahaney, Deepam Maurya, Shashank Priya

Research output: Contribution to journalArticle

12 Scopus citations

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.

Original languageEnglish (US)
Pages (from-to)5387-5394
Number of pages8
JournalJournal of Materials Chemistry C
Volume5
Issue number22
DOIs
StatePublished - Jan 1 2017

All Science Journal Classification (ASJC) codes

  • Chemistry(all)
  • Materials Chemistry

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