Synthesis and photoluminescent properties of ZnS nanocrystals doped with copper and halogen

Manzoor, Kaiser; Vadera, Sampat Raj; Kumar, Narendra; Kutty, T.R.N.

doi:10.1016/s0254-0584(03)00366-3

Cited by 214 publications

(114 citation statements)

References 32 publications

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“…This effect was not further investigated, but according to Manzoor and co-workers [46], halide ions such as chloride (Cl -) might have an influence on the luminescence properties.…”

Section: Synthetic Protocolsmentioning

confidence: 99%

Cadmium-free quantum dots in aqueous solution: Potential for fingermark detection, synthesis and an application to the detection of fingermarks in blood on non-porous surfaces

Moret

Bécue

Champod

2013

Forensic Science International

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The use of quantum dots (QDs) in the area of fingermark detection is currently receiving a lot of attention in the forensic literature. Most of the research efforts have been devoted to cadmium telluride (CdTe) quantum dots often applied as powders to the surfaces of interests.Both the use of cadmium and the nano size of these particles raise important issues in terms of health and safety. This paper proposes to replace CdTe QDs by zinc sulphide QDs doped with copper (ZnS:Cu) to address these issues. Zinc sulphide-copper doped QDs were successfully synthesized, characterized in terms of size and optical properties and optimized to be applied for the detection of impressions left in blood, where CdTe QDs proved to be efficient. Effectiveness of detection was assessed in comparison with CdTe QDs and Acid Yellow 7(AY7, an effective blood reagent), using two series of depletive blood fingermarks from four donors prepared on four non-porous substrates, i.e. glass, transparent polypropylene, black polyethylene and aluminium foil. The marks were cut in half and processed separately with both reagents, leading to two comparison series (ZnS:Cu vs. CdTe, and ZnS:Cu vs. AY7).ZnS:Cu proved to be better than AY7 and at least as efficient as CdTe on most substrates.Consequently, copper-doped ZnS QDs constitute a valid substitute for cadmium-based QDs to detect blood marks on non-porous substrates and offer a safer alternative for routine use.

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“…This effect was not further investigated, but according to Manzoor and co-workers [46], halide ions such as chloride (Cl -) might have an influence on the luminescence properties.…”

Section: Synthetic Protocolsmentioning

confidence: 99%

Cadmium-free quantum dots in aqueous solution: Potential for fingermark detection, synthesis and an application to the detection of fingermarks in blood on non-porous surfaces

Moret

Bécue

Champod

2013

Forensic Science International

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“…Different metal ions such as Cu, Mn, Pb, Co, Cd, Eu, and Sm doped with ZnS have been studied by many researchers because of their extensive photoluminescence (PL) properties [7]. Generally ZnS doped with these metal ions provide new opportunities as full-color luminescence in the UV-visible region [8][9][10][11][12]. Recent studies on Y ions incorporated into wide band gap semiconductor like ZnO [13,14] which resulted in significant increase in the optical properties, photocatalyst efficiency with improved stability of ZnO nanoparticles.…”

Section: Introductionmentioning

confidence: 99%

Studies on Characterization, Optical Absorption, and Photoluminescence of Yttrium Doped ZnS Nanoparticles

Viswanath

Naik

Somalanaik

et al. 2014

Journal of Nanotechnology

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Pure ZnS and ZnS:Y nanoparticles were synthesized by a chemical coprecipitation route using EDTA-ethylenediamine as a stabilizing agent. X-ray diffraction (XRD), high resolution transmission electron microscopy (HRTEM), field emission scanning electron microscopy (FE-SEM), Fourier transform infrared spectrometry (FTIR), thermogravimetric-differential scanning calorimetry (TG-DSC), and UV-visible and photoluminescence (PL) spectroscopy were employed to characterize the assynthesized ZnS and ZnS:Y nanoparticles, respectively. XRD and TEM studies show the formation of cubic ZnS:Y particles with an average size of ∼4.5 nm. The doping did not alter the phase of the zinc sulphide, as a result the sample showed cubic zincblende structure. The UV-visible spectra of ZnS and ZnS:Y nanoparticles showed a band gap energy value, 3.85 eV and 3.73 eV, which corresponds to a semiconductor material. A luminescence characteristics such as strong and stable visible-light emissions in the orange region alone with the blue emission peaks were observed for doped ZnS nanoparticles at room temperature. The PL intensity of orange emission peak was found to be increased with an increase in yttrium ions concentration by suppressing blue emission peaks. These results strongly propose that yttrium doped zinc sulphide nanoparticles form a new class of luminescent material.

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“…15,16 Hence, we fit the spectra of each ACEL device with the superposition of the four known Gaussian emission bands (λ =438nm, 464nm, 497 and 525nm) corresponding to the intraband transitions originating from sulphur vacancy states and a variety of surface states. 20 Broadening of these peaks is mainly determined by variations in the size 21 and crystalline phase 3 of phosphor particles. The average intensity for FeCl 3 -FLG electrodes was found to be systematically higher (see Supporting Information) than that of pristine FLG electrodes at any given wavelength and for any applied voltage in the range 40V < V AC < 180V , see Figure 2b.…”

mentioning

confidence: 99%

Homogeneously Bright, Flexible, and Foldable Lighting Devices with Functionalized Graphene Electrodes

Alonso

Karkera

Jones

et al. 2016

ACS Appl. Mater. Interfaces

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Alternating current electroluminescent technology allows the fabrication of large area, flat and flexible lights. Presently the maximum size of a continuous panel is limited by the high resistivity of available transparent electrode materials causing a visible gradient of brightness.Here, we demonstrate that the use of the best known transparent conductor FeCl 3 -intercalated few-layer graphene boosts the brightness of electroluminescent devices by 49% compared to pristine graphene. Intensity gradients observed for high aspect ratio devices are undetectable when using these highly conductive electrodes. Flat lights on polymer substrates are found to be resilient to repeated and flexural strains. * To whom correspondence should be addressed 1 arXiv:1606.05482v1 [cond-mat.mtrl-sci] Jun 2016Displays and screens are some of the most important devices within the field of optoelectronics.Large-area displays are ubiquitous in advertising, ambient lighting, television, computer screens and almost every device with an interface for its control. Current research is focused on making these devices suitable for the next generation of flexible and foldable optoelectronics. In particular, foldable displays and lighting systems would allow expandable screens for smart phones and electronic paper, wearable optoelectronics, rollable or collapsible wallpaper lights, and biocompatible light sources for medical devices. To date, alternating current electroluminescent (ACEL) technology uniquely enables the realization of flat, large-area (≈ 1m 2 ) and flexible light sources. 1 ACEL devices have good contrast and uniform brightness. They can display images with high resolution when employing nano-patterned electrodes and they can withstand mechanical shocks as well as a wide range of temperatures. 2,3 Presently, the maximum size of ACEL lighting panels is still limited to less than a square meter under practical operational conditions. This is due to the visible gradient of brightness which develops across a panel induced by the high sheet resistance (typically larger than 100Ω/2) of the transparent electrode materials. 4,5 Highly resistive electrodes also require a high operational voltage and frequency, leading to increased power consumption and accelerated device degradation. 1,5 Poly(3,4-ethylenedioxythiophene) polystyrene sulfonate (PEDOT:PSS) is a transparent and conductive polymer widely used by the printed electronics industry owing to its high mechanical flexibility. However, PEDOT:PSS has a high sheet resistance of 850Ω/2 for an optical transparency of 90%, 6-8 an unwanted blue tinge 8 and limited environmental stability. 6-8 When exposed to relative humidity of just 40%, the uptake of water by the hygroscopic PSS leads to the development of shear lips when the films are deformed, greatly increasing the sheet resistance. 7 Moreover, the absorption of water combined with the acidity of PSS is a well-known cause of degradation in device components. 9,10 Atomically thin conductors such as graphene possess many attrac...

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Synthesis and photoluminescent properties of ZnS nanocrystals doped with copper and halogen

Cited by 214 publications

References 32 publications

Cadmium-free quantum dots in aqueous solution: Potential for fingermark detection, synthesis and an application to the detection of fingermarks in blood on non-porous surfaces

Cadmium-free quantum dots in aqueous solution: Potential for fingermark detection, synthesis and an application to the detection of fingermarks in blood on non-porous surfaces

Studies on Characterization, Optical Absorption, and Photoluminescence of Yttrium Doped ZnS Nanoparticles

Homogeneously Bright, Flexible, and Foldable Lighting Devices with Functionalized Graphene Electrodes

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