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Updated: Jun 9, 2026

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Defect Localized Mechanoluminescence Model in Copper Doped Zinc Sulfide.

Hong In Jeong¹, Milos Dubajic¹, Cheong Beom Lee^2,3

¹Department of Chemical Engineering and Biotechnology, University of Cambridge, Cambridge CB3 0AS, United Kingdom.

|September 26, 2025

Summary

This summary is machine-generated.

Mechanoluminescence in doped zinc sulfide microparticles is mechanically tunable for optoelectronics. This study reveals copper defects, not the lattice, are key to emission, enabling new material design.

Keywords:

Cu doped ZnS Mechanoluminescence hyperspectral photoluminescence microscopy mechanoluminescent mechanism piezophotonic effect strain-dependent X-ray diffraction strain-induced defect localized ML model

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Published on: July 25, 2025

Area of Science:

Materials Science
Optoelectronics
Solid State Physics

Background:

Doped zinc sulfide (ZnS) microparticles show tunable mechanoluminescence (ML), crucial for advanced optoelectronics.
The underlying ML mechanism in these materials is poorly understood, hindering technological progress.

Purpose of the Study:

To elucidate the mechanoluminescence dynamics in copper-doped zinc sulfide (Cu-ZnS) microparticles.
To establish a fundamental understanding of ML mechanisms for improved material design.

Main Methods:

Utilized a hybrid technique correlating structural and optical properties at the single-sample level.
Visualized the dynamic processes occurring during mechanoluminescence emission.

Main Results:

Copper (Cu) defects are highly sensitive to lattice distortions under applied strain.
Strain-induced lattice distortion locally populates charge carriers to defect-related electronic states.
Mechanoluminescence emission originates from these localized defect sites, not the bulk ZnS lattice.

Conclusions:

A defect-localized mechanoluminescence model, triggered by elastic strain, has been proposed.
This model provides fundamental insights into the long-standing enigma of ZnS mechanoluminescence.
Findings have significant implications for designing high-performance mechanoluminescent materials for next-generation applications.