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Single-Particle Studies Reveal a Nanoscale Mechanism for Elastic, Bright, and Repeatable ZnS:Mn Mechanoluminescence in a Low-Pressure Regime

Mukhina, Maria V ; Tresback, Jason ; Ondry, Justin C ; Akey, Austin ; Alivisatos, A. Paul ; Kleckner, Nancy

ACS nano, 2021-03, Vol.15 (3), p.4115-4133 [Periódico revisado por pares]

United States: American Chemical Society

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  • Título:
    Single-Particle Studies Reveal a Nanoscale Mechanism for Elastic, Bright, and Repeatable ZnS:Mn Mechanoluminescence in a Low-Pressure Regime
  • Autor: Mukhina, Maria V ; Tresback, Jason ; Ondry, Justin C ; Akey, Austin ; Alivisatos, A. Paul ; Kleckner, Nancy
  • Assuntos: built-in electric fields ; deformation ; elastic mechanoluminescence ; energy ; INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY ; microparticles ; microplasticity ; plastics ; power ; single-particle luminescence ; stacking faults ; traps
  • É parte de: ACS nano, 2021-03, Vol.15 (3), p.4115-4133
  • Notas: ObjectType-Article-1
    SourceType-Scholarly Journals-1
    ObjectType-Feature-2
    content type line 23
    AC02-05CH11231
    USDOE Office of Science (SC), Basic Energy Sciences (BES)
  • Descrição: Mechanoluminescent materials, which emit light in response to elastic deformation, are demanded for use as in situ stress sensors. ZnS doped with Mn is known to exhibit one of the lowest reported thresholds for appearance of mechanoluminescence, with repeatable light emission under contact pressure <10 MPa. The physical basis for such behavior remains as yet unclear. Here, reliable microscopic detection of mechanoluminescence of single ZnS:Mn microparticles, in combination with nanoscale structural characterization, provides evidence that the mechanoluminescent properties of these particles result from interplay between a non-centrosymmetric crystal lattice and its defects, viz., dislocations and stacking faults. Statistical analysis of the distributions of mechanoluminescence energy release trajectories reveals two distinct mechanisms of excitation: one attributable to a piezo-phototronic effect and the other due to dislocation motion. At pressures below 8.1 MPa, both mechanisms contribute to mechanoluminescent output, with a dominant contribution from the piezo-phototronic mechanism. In contrast, above 8.1 MPa, dislocation motion is the primary excitation source. For the piezo-phototronic mechanism, we propose a specific model that accounts for elastic ZnS:Mn mechanoluminescence under very low pressure. The charged interfaces in stacking faults lead to the presence of filled traps, which otherwise would be empty in the absence of the built-in electric field. Upon application of external stress, local enhancement of the piezoelectric field at the stacking faults’ interfaces facilitates release of the trapped carriers and subsequent luminescence. This field enhancement explains how <10 MPa pressure produces thousands of photons.
  • Editor: United States: American Chemical Society
  • Idioma: Inglês
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  • Realização: ABCD-USP USP   Logos de Redes Sociais: Freepik

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