Synthesis and luminescence properties of ZnS and metal (Mn, Cu)-doped-ZnS ceramic powder

Solid State Sciences (Impact Factor: 1.67). 01/2012; DOI: 10.1016/j.solidstatesciences.2011.12.005

ABSTRACT a b s t r a c t ZnS and metal (Mn, Cu)-doped-ZnS were successfully prepared by wet chemical synthetic route. The understanding of substituted metal ions (Mn, Cu) into ZnS leads to transfer the luminescent centre by small amount of metal dopant (Mn, Cu). Fourier transform infrared and X-ray diffraction were used to determine chemical bonding and crystal structure, respectively. It showed that small amount of metal (Mn, Cu) can be completely substituted into ZnS lattice. X-ray fluorescence was used to confirm the existence of metal-doped ZnS. Scanning electron microscope revealed that their particles exhibits blocky particle with irregular sharp. Laser confocal microscope and photoluminescence spectroscopy showed that ZnS and metal-doped-ZnS exhibited intense, stable, and tunable emission covering the blue to red end of the visible spectrum. ZnS, Mn-doped-ZnS and Cu-doped-ZnS generated blue, yellow and green color, respectively.

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    ABSTRACT: Zinc sulfide (ZnS(O)) thin films doped with Mn, Ni, and Co ions are synthesized by chemical bath deposition technique onto glass substrates. X-ray diffraction study reveals that the undoped and metal-doped ZnS(O) films possess a hexagonal wurtzite crystal structure. The morphological change, upon metal-ions doping, from nanorod structures to cluster (Mn doping), compact (Ni doping), and granular shapes (Co doping) is observed. X-ray photoelectron spectroscopy reveals the presence and incorporation of metal ions into ZnS(O) lattice sites and the formation of a metal–ZnS combined structure. The band gap energy of the undoped ZnS(O) film is found to be larger than 4.0 eV, while it is 3.8, 3.7, and 3.6 eV for the Mn–ZnS(O), Ni–ZnS(O), and Co–ZnS(O) films, respectively. All the undoped and metal-doped ZnS(O) samples exhibit blue luminescence, which originates from the surface defects and trap centers. Thus, the photoluminescence (PL) (blue light emission) is due to the radiative recombination from various trap levels (shallow donor levels) to the valence band. The decrease in the PL peak intensity for the doped samples indicates the reduction of surface defects suggesting the incorporation of metal ions into the host lattice of ZnS(O). Based on the PL results, the PL energy-level diagram for the undoped and metal-doped ZnS(O) samples is proposed.
    Thin Solid Films 06/2013; 537:36–41. · 1.60 Impact Factor
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    ABSTRACT: Submicronparticles of ZnS were synthesized at low temperature using a top-down fabrication process by ultrasonication. The obtained ZnS particles were characterized by scanning transmission electron microscopy (S/TEM), energy dispersive X-ray analysis (EDAX), Fourier transform infra-red spectroscopy (FTIR), UV–visible spectrophotometry (UV), and photoluminescence spectroscopy (PL). The results showed that the formed products are ZnS particles with size less than 200 nm and exhibit a strong luminescence in the blue region. The origin of the blue emission could be attributed to the quantum size effect of ZnS nanocrystals.
    Materials Letters 05/2014; 129:8-11. · 2.22 Impact Factor
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    ABSTRACT: Nanoparticles of undoped and metal (Sn 2+ and Cu 2+) doped individually and combined with ZnS have been synthesised using triethylamine by precipitation. X-ray diffraction and optical absorption measurements have been made on nanoparticles of pure and metal doped ZnS. The studies reveal that the metal doped ZnS does not modify the cubic structure and the average crystallite size is found to be in the range of 6 -15 nm. The undoped ZnS nanoparticles have higher optical absorption in the visible region than the metal doped ZnS and the allowed direct band gap energy is found to increase in metal doped samples.
    Walailak Journal of Science and Technology. 08/2014; 11(9):795-801.


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Jun 2, 2014