Strong green luminescence of Ni 2+ -doped ZnS nanocrystals

Nickel-doped zinc sulfide nanoparticles were successfully synthesized in air atmosphere through chemical precipitation method using surfactants in aqueous medium. The product was characterized by different techniques such as X-ray diffraction (XRD), transmission electron microscopy (TEM), fourier transform infrared spectrometer (FT-IR), UV-visible absorption and photoluminescence (PL). Crystal structure, size and morphology of the ZnS:Ni 2? nanoparticles were investigated by XRD and TEM. In the PL emission, a couple of new peaks were observed instead of a single peak by changing the precursor solution. In addition, an enhanced PL emission was observed using surfactants. Phase changes were also observed at different temperatures.

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“…, the luminescent center of Ni 2? is formed in ZnS (Yang et al 2002). Thus, the blue and green luminescences have been observed from Ni 2?…”

Section: Optical Absorptionmentioning

confidence: 77%

Synthesis and optical properties of monodispersed Ni2+-doped ZnS nanoparticles

Murugadoss

Kumar

2012

Appl Nanosci

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“…In comparison with pure ZnS, an additional emission centered at around 520 nm is observed besides the emissions from pure ZnS. This emission is closely related to the 3 T 1 -3 A 2 transition within the 3F shell of Ni 2+ ions; the lowest multiplet term 3F of the free Ni 2+ ion is split into 3 T 1 , 3 T 2 , and 3 A 2 by the anisotropic hybridization, resulting in the d-d photon transition in Ni 2+ and forming the Ni 2+ luminescence center in the ZnS [29]. And normally the observed green emission is related to the 3 T 1 -3 A 2 transition of Ni 2+ ions.…”

Section: Photoluminescence Studiesmentioning

confidence: 82%

Optical and Magnetic Properties of Ni Doped ZnS Diluted Magnetic Semiconductors Synthesized by Hydrothermal Method

Wei

Zhao

et al. 2017

Journal of Nanomaterials

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Diluted magnetic semiconductors Zn 1− Ni S with different consistency ratio ( = 0, 0.01, 0.03, 0.05, and 0.07) were successfully synthesized by hydrothermal method using ethylenediamine as a modifier. The influence of Ni doping concentration on the microstructure, morphology, and optical and magnetic properties of undoped and Ni doped ZnS nanocrystals was characterized by X-ray diffraction (XRD), high-resolution transmission electron microscopy (HRTEM), X-ray energy dispersive spectrometry (XEDS), ultraviolet-visible spectroscopy (UV-vis), Fourier transform infrared spectroscopy (FT-IR), photoluminescence spectra (PL), and the vibrating sample magnetometer (VSM), respectively. The experiment results show the substitution of Ni 2+ on Zn 2+ sites without changing the hexagonal wurtzite structure of ZnS and generate single-phase Zn 1− Ni S with good crystallization. The lattice constant causes distortion and decreases with the increase of Ni 2+ doped concentration. The appearance of the samples is one-dimensional well-dispersed nanorods. UV-vis spectra reveal the band gap of all Zn 1− Ni S samples greater than that of bulk ZnS (3.67 eV), and blue shift phenomenon occurs. The photoluminescence spectra of undoped and doped samples possess the broad blue emission band in the range of 400-650 nm; the PL intensities of Zn 1− Ni S nanorods increase with the increase of Ni content comparing to pure ZnS and reach maximum for = 0.03. Magnetic measurements indicated that the undoped ZnS samples are superparamagnetic, whereas the doped samples exhibit ferromagnetism.

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“…Efficient doping of rare-earth ions into II-VI semiconductor host is not favorable compared to the transition metals. In view of this, transition metal doped ZnS, like ZnS: Mn [2], ZnS:Cu [3], ZnS:Co [4] and ZnS:Ni [5] have been widely investigated. However, surprisingly, inspite of both applied and academic interest, Cr doped ZnS has been least studied.…”

Section: Introductionmentioning

confidence: 99%

Crystallographic and optical studies on Cr doped ZnS nanocrystals

2014

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Chromium doped ZnS nanocrystals with pure and 10% compositions were synthesized by chemical co-precipitation route. Samples were characterized by X-ray diffraction (XRD) technique, Fourier transforms infrared spectroscopy (FTIR) and UV-Visible spectrometer. Lattice parameter 'a' decreases and grain size increases with increasing Cr concentration. XRD study shows that both the samples have cubic structure. Grain size increases due to ionic radius. The functional groups and chemical species of Cr doped ZnO samples were determined using FTIR data. UV-Vis study revealed that red shift is clearly observed in absorption band. Surface morphology of pure and 10% Cr doped samples was investigated by SEM technique and it is confirmed that images exibit cubic form of the samples. Using EDS, percentage of chemical compositions of material recorded.

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Strong green luminescence of Ni 2+ -doped ZnS nanocrystals

Cited by 94 publications

References 1 publication

Synthesis and optical properties of monodispersed Ni2+-doped ZnS nanoparticles

Synthesis and optical properties of monodispersed Ni2+-doped ZnS nanoparticles

Optical and Magnetic Properties of Ni Doped ZnS Diluted Magnetic Semiconductors Synthesized by Hydrothermal Method

Crystallographic and optical studies on Cr doped ZnS nanocrystals

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