We have investigated the effect of ZnO films used as buffer layers on the triboluminescence (TrL) intensity of ZnS:Mn thin films on quartz substrates using RF magnetron sputtering method and annealing technique. Highly oriented film of ZnO was firstly deposited on quartz glass substrate and then the ZnS:Mn film was successfully deposited on the ZnO film with orientation. By annealing at 5% H2 in Ar ambient, the crystallinity of both ZnO and ZnS:Mn films was increased. It was found that the addition of the ZnO buffer layer greatly improve the TrL intensity of the ZnS:Mn films.
Mechanoluminescence (ML) materials are known to emit light due to the application of mechanical stress. The ML responding to elastic deformation, plastic deformation and fracture is referred here as elasoticoluminescence, plasticoluminescence and fractoluminescence, the former two belong to non-destructive ML and the later belongs to destructive ML. Until now, the destructive ML has been observed in various inorganic and organic materials, whereas the non-destructive ML has been found in very limited cases. No practice application of non-destructive ML has been realized so far. On the other hand, ML material as it transfers a mechanical stress into a light emission, is believed to be a new smart material for various mechano- optical applications. Recently we have done a series research on ML both in fundamental and application aspects. This paper focuses on the investigation of elastico- luminescence. The results of the present work reveal that the ML coatings on the surface of solid can direct display the stress distribution by a mechanolumnescnce image.
We report the realization of the dynamic image of stress distribution by developing a remarkably strong mechanoluminescence (ML) material of Sr0.975Al2O3.985:Eu0.01(SAO- E), which can emit four orders of magnitude larger intensity than that of the reported strong ML material of quartz crystal. This ML material can be mixed in the target composite or coated on the surface to sense stress by emitting visible light. This method is applicable to the dynamic visualization of stress distribution in a solid not only in the atmosphere but also in an aqueous environment. A simulation result confirms that such a ML image successfully reflects the stress distribution. A kinetic model for ML of SAO-E is proposed.
We have investigated the triboluminescence (TrL) intensities of as-grown and thermally annealed ZnS thin films doped with manganese on quartz substrates. The ZnS:Mn thin films were deposited by rf magnetron sputtering and thermally annealed in a reducing gas (5% H2/Ar) at 500 degrees Celsius, 600 degrees Celsius, 700 degrees Celsius and 800 degrees Celsius. The crystallinity and the triboluminescence intensities of the films were greatly enhanced by postannealing up to 700 degrees Celsius, accompanied by an increase in the adherent strength of the film. An X-ray diffractometer and a Scratch Adhesion Tester were used to study the crystallinity and adhesion of the as-grown and annealed films respectively. Results based on crystallographic and acoustic emission data were used to explain the failure mechanisms in the films during the triboluminescence measurement.
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