Artificial skin to sense mechanical stress by visible light emission

Xu, Chao‐Nan; Watanabe, Toshiro; Akiyama, Morito; 鄭, 旭光

doi:10.1063/1.123510

Cited by 410 publications

(337 citation statements)

References 27 publications

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“…This luminescence was also observed in nanocrystalline ZnS:Mn 2+ 7,8 and applications have already been suggested. [9][10][11] Different types of Mn 2+ centers are present in nanocrystalline ZnS:Mn 2+ . 12,13 The orange luminescence originates from Mn 2+ ions on Zn 2+ sites, where the Mn 2+ is tetrahedrally coordinated by S 2-.…”

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confidence: 99%

Synthesis and Photoluminescence of Nanocrystalline ZnS:Mn²⁺

et al. 2001

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The influence of the synthesis conditions on the properties of nanocrystalline ZnS:Mn 2+ is discussed. Different Mn 2+ precursors and different ratios of the precursor concentrations [S 2-]/[Zn 2+ ] were used. The type of Mn 2+ precursor does not have an effect on the luminescence properties in the synthesis method described. On going from an excess of [Zn 2+ ] to an excess of [S 2-] during the synthesis, the particle diameter increases from 3.7 to 5.1 nm, which is reflected by a change in the luminescence properties. Photoluminescence measurements also showed the absence of the ZnS defect luminescence around 450 nm when an excess [S 2-] is used during the synthesis. This effect is explained by the filling of sulfur vacancies. The ZnS luminescence is quenched with an activation energy of 62 meV, which is assigned to the detrapping of a bound hole from such a vacancy.Over the past few years, considerable interest in the novel optical and electrical properties of doped semiconductor nanocrystals (NC) has emerged. 1-5 These structures are interesting from a physical and chemical point of view mainly because several of their properties are very different from those of bulk materials. 3 Especially, the significant sizedependent shift in the band gap has attracted much attention. This so-called quantum-size effect allows one to tune the emission and excitation wavelengths of a nanocrystal by tuning the crystal radius r. A quite good first-order approximation to calculate the energy of the band gap is given by the Brus equation. 1 In the case of zinc blende ZnS, the bulk values of all the materials parameters are known. 6 For nanocrystalline ZnS this results in a relation between the particle radius r, in nanometers, and the band gap E, in electronvolts, as follows:Manganese-doped materials represent a class of phosphors that have already found their way into many applications. The 4 T 1 f 6 A 1 transition within the 3d 5 configuration of the divalent manganese ion (Mn 2+ ) has been studied extensively and its orange-yellow luminescence in ZnS is well documented. This luminescence was also observed in nanocrystalline ZnS:Mn 2+ 7,8 and applications have already been suggested. 9-11 Different types of Mn 2+ centers are present in nanocrystalline ZnS:Mn 2+ . 12,13 The orange luminescence originates from Mn 2+ ions on Zn 2+ sites, where the Mn 2+ is tetrahedrally coordinated by S 2-.Previous workers have always used equal concentrations of Zn 2+ and S 2-precursors in the synthesis of these ZnS: Mn 2+ nanocrystals. This letter will focus on the effect of the synthesis conditions on several properties of these nanocrystals. Two different Mn 2+ precursors were used and the influence of the ratio of [Zn 2+ ] to [S 2-] was investigated. The experimental comparison will include measurements of the diameter, reflectivity, temperature-dependent photoluminescence (PL) emission and excitation as well as luminescence lifetimes. From these results, new insights into the ZnS-related luminescence are obtained and a qualitative...

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Synthesis and Photoluminescence of Nanocrystalline ZnS:Mn²⁺

et al. 2001

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“…quartz and some polymers, but the most efficient ML materials reported are persistent luminescent materials [6][7][8][9][10][11][12][13].…”

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Mechanoluminescence in BaSi2O2N2:Eu

et al. 2012

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Mechanoluminescence (ML), a general term for the phenomenon in which light emission occurs during any mechanical action on a solid, can be divided roughly into two classes: destructive ML and non-destructive ML. For practical use in high-end applications (e.g. pressure sensors), materials with non-destructive ML properties are preferred. This paper reports on the strong non-destructive ML in BaSi 2 O 2 N 2 :Eu. When irradiated in advance with UV or blue light, this phosphor shows intense blue-green light emission upon mechanical stimulation such as friction or pressure. The ML has an emission band peaking at 498 nm, which is about 4 nm red-shifted compared to the steady state photoluminescence. The origin of the ML is discussed and related to the persistent luminescence of BaSi 2 O 2 N 2 :Eu. The same traps are responsible for both the phenomena.Based on the occurrence of ML in this phosphor, we were able to derive that the predominant crystallographic structure of BaSi 2 O 2 N 2 :Eu belongs to space group Cmc2 1 .

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“…Zinc sulphide (ZnS) exhibit Elastico-ML [1,2], Plastico-ML [3,4] and Fracto-ML [5] and zinc sulphide phosphor also reveal the ML during hyper velocity impact [6]. Pure zinc-sulfide is a noncentric [7] and exhibit ML [8].…”

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confidence: 99%

Study of Mechanoluminescent ZnS: Cu, Cl Phosphor for Developing Sensors

Sanodiya¹

2017

IJRASET

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Luminescence due to fracture is known as fracto-Mechanoluminescence (FML). Recently, fracto-luminescence phenomenon has enabled us to explore various advanced sensor applications such as pressure sensors, damage sensors, etc. This article reports the FML of ZnS: Cu, Cl phosphor prepared by solid state reaction method using nitrogen atmosphere. When ZnS: Cu, Cl phosphor is deformed impulsively by the impact of a moving piston then, initially mechanoluminescence (ML) intensity increases with time, attains a peak value and then decreases with time. The semi-log plot of the ML intensity versus (t-tm) gives the negative slope. The peak ML intensity increases linearly with increasing impact velocity. ML intensity is also increases linearly with increasing mass of the phosphor. The total ML intensity initially increases with increasing impact velocity and then it tends to attain a saturation value for higher values of the impact velocity of piston. The ML and photoluminescence (PL) spectra are lies at 532nm. The ZnS doped Cu; Cl is very cheap and suitable material for developing sensors.

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Artificial skin to sense mechanical stress by visible light emission

Cited by 410 publications

References 27 publications

Synthesis and Photoluminescence of Nanocrystalline ZnS:Mn²⁺

Synthesis and Photoluminescence of Nanocrystalline ZnS:Mn²⁺

Mechanoluminescence in BaSi2O2N2:Eu

Study of Mechanoluminescent ZnS: Cu, Cl Phosphor for Developing Sensors

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Artificial skin to sense mechanical stress by visible light emission

Cited by 410 publications

References 27 publications

Synthesis and Photoluminescence of Nanocrystalline ZnS:Mn2+

Synthesis and Photoluminescence of Nanocrystalline ZnS:Mn2+

Mechanoluminescence in BaSi2O2N2:Eu

Study of Mechanoluminescent ZnS: Cu, Cl Phosphor for Developing Sensors

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Product

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Synthesis and Photoluminescence of Nanocrystalline ZnS:Mn²⁺

Synthesis and Photoluminescence of Nanocrystalline ZnS:Mn²⁺