Optical properties of manganese-doped nanocrystals of ZnS

Bhargava, R. N.; Gallagher, D.; Xie, Hui; Nurmikko, A. V.

doi:10.1103/physrevlett.72.416

Cited by 1,955 publications

(1,383 citation statements)

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“…These investigations enable us to confirm an enhancement of the Mn 2+ intra-shell emission in nanoparticles. Such enhancement was reported for the first time by Bhargava and Gallagher for ZnMnS nanoparticles [1] and then was observed by us for several other systems [2][3][4].…”

Section: Introductionmentioning

confidence: 48%

“…In particular, this PL decay is long in compounds with weak spin-orbit interaction, such as CdS or ZnS (ms decay). Surprisingly, Bhargava and Gallagher reported a dramatic shortening of the Mn 2+ PL decay time (by six orders in magnitude) in nanoparticles of ZnMnS [1]. Such shortening of the PL decay time could not be related to competition of some nonradiative recombination processes, since shortening of the PL decay time was observed together with a high quantum efficiency of the intra-shell PL.…”

Section: Basic Conceptsmentioning

confidence: 95%

“…The effect was tentatively explained by a model of a quantum confined atom. In this model, quantum confinement affects Mn 2+ 3d-type wave function (sp−d hybridization with host states) and thus relaxes parity and spin selection rules for the Mn 2+ intra-shell transition [1].…”

Section: Basic Conceptsmentioning

confidence: 99%

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Dynamics of Light Emission in CdMnS Nanoparticles

et al. 2005

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We demonstrate coexistence of slow and fast components of photoluminescence decay of the Mn 2+ intra-shell emission in nanoparticles of CdMnS. We explain the observed decrease in PL lifetime of the Mn 2+ intra-shell transition by high efficiency of spin dependent magnetic interactions between localized spins of Mn 2+ ions and free carriers. This mechanism is enhanced in nanostructures, but it is also present in bulk samples.

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Section: Introductionmentioning

confidence: 48%

Section: Basic Conceptsmentioning

confidence: 95%

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Dynamics of Light Emission in CdMnS Nanoparticles

et al. 2005

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“…If the electrons and holes created do not recombine rapidly, they need to be either trapped in some metastable states or migrate to the semiconductor surface separately. As the thickness become smaller, the surface states increase rapidly, thus, reducing the nonradiative surface recombination [31]. In other words, the thinner wall is easier for the excited electrons migrate from bulk to surface and provides more accessible carriers trapped on catalyst surface for the photocatalysis thus, enhancing the photocatalytic efficiency.…”

Section: Effect Of the Wall Thickness Of Tio 2 Nanotubesmentioning

confidence: 99%

Effects of structure of anodic TiO2 nanotube arrays on photocatalytic activity for the degradation of 2,3-dichlorophenol in aqueous solution

Liang

2009

Journal of Hazardous Materials

179

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In this study titanium dioxide nanotube (TNT) arrays were prepared by an anodic oxidation process with post-calcination. The morphology and structure of the TNT films were studied by FESEM, XRD, and XPS. Photocatalytic activity of the TNT films was evaluated in terms of the degradation of 2,3-dichlorophenol in aqueous solution under UV light irradiation. The effects of the nanotube structure including tube length and tube wall thickness, and crystallinity on the photocatalytic activity were investigated in details. The results showed that the large specific surface area, high pore volume, thin tube wall, and optimal tube length would be important factors to achieve the good performance of TNT films. Moreover, the TNT films calcined at 500 o C for 1 h with the higher degree of crystallinity exhibited the higher photocatalytic activity than other TNT films calcined at 300 o C and 800 o C. Consequently, these results indicate that the optimization of TiO 2 nanotube structures is critical to achieve the high performance of photocatalytic reaction.

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“…They are technologically important as luminescence centers and charge compensations as well as unwanted traps. Since Bhargava et.al reported the novel properties in nanosized ZnS doped with Mn +2 ions [9], many studies have been published on Ti, V, Cr, Mn, Fe, Co, Ni, Cu and rare earth metal ions activated II-VI, III-V and I-III-VI nanometer scale semiconductor materials [10,17]. Commonly used techniques for the synthesis of II-VI semiconductor Q-dots includes solid-state reaction, sol-gel, microwave electromagnetic radiation, hydrothermal [18][19][20][21].…”

Section: Introductionmentioning

confidence: 99%

Tuning luminescence of 3d transition- metal doped quantum particles: Ni+2: CdS and Fe+3: CdS

Taheri¹,

Yousefi²,

Khosravi³

2010

Braz. J. Phys.

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The room-temperature photoluminescence of Cd 1−x M x S (M=Ni, Fe) nanoparticles were investigated. Compared with the photoluminescence of CdS which peaks at 475 nm, the photoemission of CdS:Fe nanoparticles was peaking at 537 nm because of Fe acting as luminescent centers. On the other hand, the green emission (503 nm) of CdS:Ni attributed to the 1 T 2g (D)→ 3 A 2g (F) raditive transition. With the increase of the Ni +2 concentration, photoluminescence intensity is increased while by Fe replacement with Cd ions, PL intensity is decreased. Relative to bulk crystals, due to the quantum confinement effect the band gap of CdS clusters is significantly blue-shifted with decreasing cluster size. CdS nanoclusters present a mixed hexagonal/cubic structure and with increasing doping concentration the peaks position of doped CdS shifts to higher angle.

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Optical properties of manganese-doped nanocrystals of ZnS

Cited by 1,955 publications

References 10 publications

Dynamics of Light Emission in CdMnS Nanoparticles

Dynamics of Light Emission in CdMnS Nanoparticles

Effects of structure of anodic TiO2 nanotube arrays on photocatalytic activity for the degradation of 2,3-dichlorophenol in aqueous solution

Tuning luminescence of 3d transition- metal doped quantum particles: Ni+2: CdS and Fe+3: CdS

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