Effect of<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msup><mml:mrow><mml:mi mathvariant="normal">Mn</mml:mi></mml:mrow><mml:mrow><mml:mn>2</mml:mn><mml:mo>+</mml:mo></mml:mrow></mml:msup></mml:mrow></mml:math>concentration in ZnS nanoparticles on photoluminescence and electron-spin- resonance spectra

Borse, Pramod H.; Srinivas, D.; Shinde, Rushikesh; Date, S. K.; Vogel, Walter; Kulkarni, Sulabha K.

doi:10.1103/physrevb.60.8659

Cited by 139 publications

(112 citation statements)

References 14 publications

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“…Moreover, at least in some of the quantum dots, the Mn-Mn interaction is strong enough to reveal the hyperfine splitting. Signal II may arise due to the location of Mn near the surface 5,11,13 of the ZnSe quantum dot. Signal II is superimposed on signal I, and is originated since Mn 2+ has less of a symmetric environment.…”

Section: Resultsmentioning

confidence: 99%

“…2͑b͔͒, with g = 2.0069 and ͉A͉ = 84.4ϫ 10 −4 cm −1 . This value of hyperfine splitting constant is related to the Mn 2+ ions bound to the surface 13 of the ZnSe quantum dot. Mn ions bound to the surface of quantum dots show less symmetry than cubic.…”

Section: Resultsmentioning

confidence: 99%

“…2 High fluorescence efficiency along with magnetic ordering makes Mn an interesting transition element dopant [3][4][5][6][7][8][9][10][11][12][13][14][15][16][17][18] in the semiconductor nanoparticles. Recently, Mn-doped ZnSe nanoparticles [3][4][5][6][7][8][9][10] received much attention since it has the potential application for luminescent as well as spintronic devices.…”

Section: Introductionmentioning

confidence: 99%

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Magnetic behavior of manganese-doped ZnSe quantum dots

Lad

Rajesh

Khan

et al. 2007

Journal of Applied Physics

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Magnetic properties of manganese-doped ZnSe quantum dots with the size of approximately 3.6 nm are investigated. The amount of Mn in the ZnSe quantum dots has been varied from 0.10% to 1.33%. The doping level in the quantum dots is much less than that used in the precursor. The co-ordination of Mn in the ZnSe lattice has been determined by electron paramagnetic resonance ͑EPR͒. Two different hyperfine couplings 67.3ϫ 10 −4 and 60.9ϫ 10 −4 cm −1 observed in the EPR spectrum imply that Mn atoms occupy two distinct sites; one uncoordinated ͑near the surface͒ and other having a cubic symmetric environment ͑nanocrystal core͒, respectively. Photoluminescence measurements also confirm the incorporation of Mn in ZnSe quantum dots. From the Curie-Weiss behavior of the susceptibility, the effective Mn-Mn antiferromagnetic exchange constant ͑J 1 ͒ has been evaluated. The spin-glass behavior is observed in 1.33% Mn-doped ZnSe quantum dots, at low temperature. Magnetic behavior at a low temperature is discussed.

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Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Magnetic behavior of manganese-doped ZnSe quantum dots

Lad

Rajesh

Khan

et al. 2007

Journal of Applied Physics

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“…[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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“…In addition, electron paramagnetic resonance (EPR) technique has been widely used to obtain an insight into the local crystal field effects and symmetry around Mn 2? ions (Borse et al 1999). The observed Mn 2?…”

Section: Introductionmentioning

confidence: 99%

Photoluminescence enhancement of hexagonal-phase ZnS:Mn nanostructures using 1-thioglycolic acid

2013

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Hexagonal wurtzite ZnS:Mn 2? nanostructures were synthesized at lower temperature (80°C) by chemical method in an air atmosphere using 1-thioglycolic acid (TGA) as a stabilizing agent. It is a simple, highly efficient and energy-saving method for large-scale synthesis of hexagonal ZnS:Mn 2? nanoparticles at lower temperature. Structural and optical properties of the samples were investigated. An optimum concentration of TGA was selected through optical PL study.

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Effect ofMn2+concentration in ZnS nanoparticles on photoluminescence and electron-spin- resonance spectra

Cited by 139 publications

References 14 publications

Magnetic behavior of manganese-doped ZnSe quantum dots

Magnetic behavior of manganese-doped ZnSe quantum dots

Synthesis and Photoluminescence of Nanocrystalline ZnS:Mn²⁺

Photoluminescence enhancement of hexagonal-phase ZnS:Mn nanostructures using 1-thioglycolic acid

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Effect ofMn2+concentration in ZnS nanoparticles on photoluminescence and electron-spin- resonance spectra

Cited by 139 publications

References 14 publications

Magnetic behavior of manganese-doped ZnSe quantum dots

Magnetic behavior of manganese-doped ZnSe quantum dots

Synthesis and Photoluminescence of Nanocrystalline ZnS:Mn2+

Photoluminescence enhancement of hexagonal-phase ZnS:Mn nanostructures using 1-thioglycolic acid

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Synthesis and Photoluminescence of Nanocrystalline ZnS:Mn²⁺