Rate-equation model for the loading-rate-dependent mechanoluminescence of SrAl_2O_4:Eu^2+,Dy^3+

Kim, Ji Sik; Kibble, Kevin A.; Kwon, Youngeun; Sohn, Kee‐Sun

doi:10.1364/ol.34.001915

Cited by 68 publications

(34 citation statements)

References 25 publications

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“…Changing of the surface as a result of movement of charged dislocations is believed to be responsible for pulsed ML whereas electrostatic interaction between the charged dislocations and filled electron traps has been reported to be responsible for continuous ML in the plastic region of II-VI semiconductors. [7][8][9][10] ZnS is a piezoelectric material, and piezoelectric materials have the property of converting stress (force) into electrical (or voltage) signals. When stress is applied to a piezoelectric layer, electrical charges are induced at the top and bottom of the layer.…”

Section: Introductionmentioning

confidence: 99%

Experimental and Theoretical Study of the Mechanoluminescence of ZnS:Mn Nanoparticles

Sharma

Bisen

Chandra

2015

Journal of Elec Materi

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We report the synthesis and mechanoluminescence (ML) of manganese-doped zinc sulfide (ZnS) nanoparticles. Clusters of ZnS:Mn nanocrystals were prepared by chemical precipitation, by mixing of solutions of zinc chloride, sodium sulfide, and manganese chloride. Mercaptoethanol (ME) was used as capping agent, to modify the surface of the nanoparticles and prevent their growth. The particle size of the nanocrystals, measured by use of x-ray diffraction and transmission electron microscopy, was in the range 2-5 nm. The ZnS:Mn nanoparticles were deformed impulsively by dropping a load from a fixed height. The ML intensity of ZnS:Mn nanocrystals increased with increasing mechanical stress i.e. with increasing impact velocity. The impact velocitydependence of maximum ML intensity, I m , and total ML intensity, I T , are discussed. The effect of crystal size on the ML intensity-time curve is also discussed. ML intensity initially increases with increasing concentration of Mn in the samples, reaches an optimum value at a specific concentration of Mn, then decreases with further increasing concentration of Mn in the nanocrystals. The theory of the ML of nanoparticles is also discussed.

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Section: Introductionmentioning

confidence: 99%

Experimental and Theoretical Study of the Mechanoluminescence of ZnS:Mn Nanoparticles

Sharma

Bisen

Chandra

2015

Journal of Elec Materi

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“…As a result, it was found that the mechanically driven luminescence of ZnS:Cu was available only when this phosphor was combined with the polydimethylsiloxane (PDMS) matrix. On the contrary, other well-known ML phosphors such as SAO and ZnS:Mn gave a promising ML, when hard matrix materials were adopted, [1][2][3][4][5][6][7][8][9] but no luminescence when a soft PDMS was adopted as a matrix material. It is evident that the conventional ML materials exhibit the strongest ML owing to the stronger load transfer when the rigid matrix materials were adopted, i.e., SAO and ZnS:Mn gave a promising ML with epoxy resin and acrylic resin but no luminescence with PDMS.…”

Section: -15mentioning

confidence: 92%

“…A similar double-peak response has also been observed for the case of ZnS:Mn film under a compressive load of 500 N. 25 However, those double peaks were produced by a controlled static loading and an abrupt release in a relatively long time scale (∼20 s). It was a typical loading rate dependent conventional ML, 6 which differs from the dynamic cyclic behavior. The ML in the present case may be only due to the soft friction-induced electric field, which is high enough to excite electroluminescence.…”

Section: -15mentioning

confidence: 99%

“…[1][2][3] It is impossible to maintain non-decaying ML while loading without prior (or intermittent) photo-excitations. [4][5][6][7][8][9] It would be a futile delusion to achieve such a dream using conventional ML materials. The conventional ML is associated with the shallow carrier traps at around just below the conduction band or just above the valence band.…”

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Mechanically driven luminescence in a ZnS:Cu-PDMS composite

et al. 2016

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The conventional mechanoluminescence (ML) mechanism of phosphors such as SrAl2O4:Eu and ZnS:Mn is known to utilize carrier trapping at shallow traps followed by stress (or strain)-induced detrapping, which leads to activator recombination in association with local piezoelectric fields. However, such a conventional ML mechanism was found to be invalid for the ZnS:Cu-embedded polydimethylsiloxane (PDMS) composite, due to the absence of luminescence with a rigid matrix and a negligibly small value of the piezoelectric coefficient (d33) of the composite. An alternative mechanism, namely, the triboelectricity-induced luminescence has been proposed for the mechanically driven luminescence of a ZnS:Cu-PDMS composite.

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“…At present, many other researchers have also started to develop novel ML materials, sensors, and diagnostic methods. (12)(13)(14) Meanwhile, the Trillion Sensors Universe, in which over trillions of sensors cover an entire society, has been starting. The number of sensors in the universe will be 100 times the present requirement with 150 new sensors per year for each of the 7 billion people worldwide.…”

Section: Introductionmentioning

confidence: 99%

Innovative First Step toward Mechanoluminescent Ubiquitous Light Source for Trillion Sensors

2016

Sensors and Materials

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Keywords: mechanoluminescence, elasticoluminescent material, ubiquitous light source Recently, there have been innovative mechanoluminescent (ML) particles made available, each of which repeatedly emits light in response to small applied stresses even in an elastic region. When dispersedly coated onto a structure, each particle acts as a sensitive mechanical sensor, while the two-dimensional emission pattern of the whole assembly reflects the dynamical stress distribution inside the structure and the mechanical information around cracks and defects. On the other hand, ML ubiquitous light sources, the other final goal of mechanoluminescence, have been discussed and investigated toward innovative nano-light sources, which can be utilized anytime and anywhere, even in deep tissue and cells for an energy harvesting system for trillion sensors. In this review, we would like to focus on the activity toward the ML ubiquitous light sources, and introduce them from the next four viewpoints; the potential of the ML light source, the performance of a single ML ubiquitous light source, nondestructive and noninvasive mechanical stimulation, and application.

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Rate-equation model for the loading-rate-dependent mechanoluminescence of SrAl_2O_4:Eu^2+,Dy^3+

Cited by 68 publications

References 25 publications

Experimental and Theoretical Study of the Mechanoluminescence of ZnS:Mn Nanoparticles

Experimental and Theoretical Study of the Mechanoluminescence of ZnS:Mn Nanoparticles

Mechanically driven luminescence in a ZnS:Cu-PDMS composite

Innovative First Step toward Mechanoluminescent Ubiquitous Light Source for Trillion Sensors

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