Mechanoluminescence and thermoluminescence of Mn doped ZnS nanocrystals

Sharma, Ravi; Bisen, D. P.; Dhoble, S.J.; Brahme, Nameeta; Chandra, B. P.

doi:10.1016/j.jlumin.2011.05.020

Cited by 48 publications

(23 citation statements)

References 35 publications

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“…These peaks correspond to diffraction at the (111), (220), and (311) planes, respectively. 20,21 The lattice constant was calculated to be 5.31 Å , which is very close to the standard value (5.42 Å ). The XRD pattern confirms the samples have the zinc blend structure.…”

Section: Resultssupporting

confidence: 73%

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: Resultssupporting

confidence: 73%

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

Sharma

Bisen

Chandra

2015

Journal of Elec Materi

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“…The FML may occur due to the piezoelectric effect as well as due to an electrostatic field near the charged dislocations; however, for the crystals of micrometer size and the bigger size, the moving dislocations are the origin of FML. In the case of nanoparticles, the dislocation segment is very small and; hence, the bending in the dislocation segment may not be significant to cause the appreciable interaction between the bending segment of dislocation and filled electron traps in the nanocrystals [16]. It was observed that, initially the ML intensity increases with time, attains a peak value and then it decreases with time.…”

Section: Mechanoluminescence (Ml)mentioning

confidence: 99%

“…In the case of band bending, the trapped charge carriers may tunnel to the respective band. Subsequently, the electrons moving in the conduction band may be captured in 16 the excited state of the activator ions located adjacent to the bottom of the conduction band whereby excited ions, for example, excited Eu 2? ions are produced.…”

Section: Mechanoluminescence (Ml)mentioning

confidence: 99%

“…The light emissions induced by the elastic deformation, plastic deformation, and fracture of solids are called elastico ML, plastico ML and fracto ML, respectively, and the light induced by rubbing of solids or separation of two solids in contact is known as tribo ML or triboluminescence [16,17]. The ML phenomenon has been known for centuries; however, it is only in recent years the intense elastico and fracto mechanoluminescent materials have been found to have the potential forbeing the stress sensors, fracture sensors, damage sensors, and impact sensors.…”

Section: Introductionmentioning

confidence: 99%

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UV excited green luminescence of SrAl2O4:Eu2+, Dy3+ nanophosphor

2015

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Eu, Dy co-doped strontium aluminate nanophosphors were prepared by the combustion synthesis method. Their structure and morphology were investigated by X-ray diffraction (XRD), scanning electron microscopy, transmission electron microscopy (TEM), and Fourier transform infrared spectroscopy. According to the XRD and the TEM analysis, the average crystallite size was found to be in the nanometer range. The phase structure of the prepared nanophosphor is consistent with a standard monoclinic phase with a space group P2 1 . The prepared SrAl 2-O 4 :Eu 2? , Dy 3? nanophosphor emitted green light with a peak at 510 nm showing blue shift, which is due to the reduction in the particle size. Two distinct peaks were observed in the ML intensity versus time curve. The two peaks in ML indicate the presence of charge transfer in an ML process.

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“…In recent years, research on metal sulfide photocatalysts has progressed to applications [23][24][25] in a new photocatalytic reaction mechanism, because of their narrow band gaps that possibly allow absorption of longer wavelengths, unlike the conventional metal oxide semiconductor systems. Particularly, Muruganandham et al 26 had controlled mesoporous self-assembly of ZnS micro sphere for photocatalytic degradation of methyl orange dye.…”

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confidence: 99%

A Newly Designed a TiO₂-Loaded Spherical ZnS Nano/Micro-Composites for High Hydrogen Production from Methanol/Water Solution Photo-Splitting

Kim¹,

Kang²

2012

Bulletin of the Korean Chemical Society

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A new system using TiO 2 (nano-sized, band-gap 3.14 eV)-impregnated spherical ZnS (micro-sized, band-gap 2.73 eV) nano/micro-composites (Ti 0.001, 0.005, 0.01, and 0.05 mol %/ZnS) was developed to enhance the production of hydrogen from methanol/water splitting. The ZnS particles in a spherical morphology with a diameter of about 2-4 mm which can absorb around 455 nm were prepared by hydrothermal method. This material was used as a photocatalyst with loading by nano-sized TiO 2 (20-30 nm) for hydrogen production. The evolution of H 2 from methanol/water (1:1) photo splitting over the TiO 2 /ZnS composite in the liquid system was enhanced, compared with that over pure TiO 2 and ZnS. In particular, 1.2 mmol of H 2 gas was produced after 12 h when 0.005 mol % TiO 2 /ZnS nano/micro-composite was used. On the basis of cyclic voltammeter (CV) and UV-visible spectrums results, the high photoactivity was attributed to the larger band gap and the lower LUMO in the TiO 2 /ZnS composite, due to the decreased recombination between the excited electrons and holes.

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Mechanoluminescence and thermoluminescence of Mn doped ZnS nanocrystals

Cited by 48 publications

References 35 publications

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

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

UV excited green luminescence of SrAl2O4:Eu2+, Dy3+ nanophosphor

A Newly Designed a TiO₂-Loaded Spherical ZnS Nano/Micro-Composites for High Hydrogen Production from Methanol/Water Solution Photo-Splitting

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Mechanoluminescence and thermoluminescence of Mn doped ZnS nanocrystals

Cited by 48 publications

References 35 publications

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

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

UV excited green luminescence of SrAl2O4:Eu2+, Dy3+ nanophosphor

A Newly Designed a TiO2-Loaded Spherical ZnS Nano/Micro-Composites for High Hydrogen Production from Methanol/Water Solution Photo-Splitting

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A Newly Designed a TiO₂-Loaded Spherical ZnS Nano/Micro-Composites for High Hydrogen Production from Methanol/Water Solution Photo-Splitting