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Open AccessReview

A Review of Mechanoluminescence in Inorganic Solids: Compounds, Mechanisms, Models and Applications

by Ang Feng 1,2 and Philippe F. Smet 1,2,*
1
LumiLab, Department of Solid State Sciences, Ghent University, Krijgslaan 281-S1, 9000 Ghent, Belgium
2
Center for Nano- and Biophotonics (NB Photonics), Ghent University, 9000 Ghent, Belgium
*
Author to whom correspondence should be addressed.
Materials 2018, 11(4), 484; https://doi.org/10.3390/ma11040484
Received: 10 February 2018 / Revised: 8 March 2018 / Accepted: 12 March 2018 / Published: 23 March 2018
(This article belongs to the Section Smart Materials)
Mechanoluminescence (ML) is the non-thermal emission of light as a response to mechanical stimuli on a solid material. While this phenomenon has been observed for a long time when breaking certain materials, it is now being extensively explored, especially since the discovery of non-destructive ML upon elastic deformation. A great number of materials have already been identified as mechanoluminescent, but novel ones with colour tunability and improved sensitivity are still urgently needed. The physical origin of the phenomenon, which mainly involves the release of trapped carriers at defects with the help of stress, still remains unclear. This in turn hinders a deeper research, either theoretically or application oriented. In this review paper, we have tabulated the known ML compounds according to their structure prototypes based on the connectivity of anion polyhedra, highlighting structural features, such as framework distortion, layered structure, elastic anisotropy and microstructures, which are very relevant to the ML process. We then review the various proposed mechanisms and corresponding mathematical models. We comment on their contribution to a clearer understanding of the ML phenomenon and on the derived guidelines for improving properties of ML phosphors. Proven and potential applications of ML in various fields, such as stress field sensing, light sources, and sensing electric (magnetic) fields, are summarized. Finally, we point out the challenges and future directions in this active and emerging field of luminescence research. View Full-Text
Keywords: mechanoluminescence; elastic deformation; stress distribution sensing; mechanoluminescence mechanism; piezoelectricity; defects; persistent luminescence mechanoluminescence; elastic deformation; stress distribution sensing; mechanoluminescence mechanism; piezoelectricity; defects; persistent luminescence
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Feng, A.; Smet, P.F. A Review of Mechanoluminescence in Inorganic Solids: Compounds, Mechanisms, Models and Applications. Materials 2018, 11, 484.

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