PHOTOLUMINESCENCE PROPERTIES OF CADMIUM TUNGSTATE SYNTHESIZED BY HYDROTHERMAL METHOD
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Tungstate
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Crystalline phosphors of Eu 3+ -doped titania (TiO 2 :Eu 3+ ) were prepared by hydro and solvothermal synthesis with luminescent ion concentration of 2 mol.%.The structure and shape of the synthesized nanoparticles were characterized using X-ray powder diffraction, transmission electron microscopy, and Raman spectroscopy.Changes in the emission, excitation spectra, and the intensity decay of the photoluminescence for TiO 2 :Eu 3+ nanoparticles were analyzed their phase composition.The photoluminescence of synthesized TiO 2 :Eu 3+ crystalline phosphors depends on whether the said nanophosphors are formed from organometallic or inorganic precursors under hydro-and solvothermal conditions.Indeed, photoluminescence excitation at wavelengths ranging from 350-550 nm leads to splitting of electron dipole transitions into Stark components according to the symmetry of the Eu 3+ surroundings.Also, both nanoparticles with the anatase structure and phosphors predominantly containing rutile showed very short photoluminescence lifetimes.
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Ag-doped ZnS nanoparticles were prepared by hydrothermal synthesis from the raw powders of thiourea, zinc acetate and silver nitrate. The effects of Ag[Formula: see text] on the structural, morphological, composition, elemental analysis and luminescence properties were investigated. The results showed that the powders were all found in the cubic sphalerite structure with an average particle size of approximately 40 nm. In addition, various Ag[Formula: see text] doping concentrations (0, 0.5, 1, 3, 4, 7 and 10 at.%) were selected to study the optical properties of the ZnS nanoparticles. It was found that the photoluminescence (PL) spectra excited by 325 nm and X-ray showed a peak at 490 nm for all samples and exhibited concentration quenching behavior. The PL results also indicate that the most favorable silver doping concentration for emission is 3 at.%. These results suggested that ZnS:Ag (3 at.%) nanoparticles were promising candidate materials for certain areas, such as screen displays, scintillators and lasers.
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We report the influence of ammonium hydroxide (NH4OH), as growth additive, on zinc oxide nanomaterial through the optical response obtained by photoluminescence (PL). A low-temperature hydrothermal process is employed for the growth of ZnO nanowires (NWs) on seedless Au surface. A more than two order of magnitude change in ZnO NW density is demonstrated via careful addition of NH4OH in the growth solution. Further, we show by systematic experimental study and PL characterization data that the addition of NH4OH can degrade the optical response of ZnO NWs produced. The increase of growth solution basicity with the addition of NH4OH may slowly degrade the optical response of NWs by slowly etching its surfaces, increasing the point defects in ZnO NWs. The present study demonstrates the importance of growth nutrients to obtain quality controlled density tunable ZnO NWs on seedless conducting substrates.
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Nanocrystalline Bi 2 WO 6 was synthesized by means of hydrothermal treatment.It was shown that the formation rate of bismuth tungstate nanocrystals was determined by the presence of clusters formed at the stage of precipitation and having the same structure as that of Bi 2 WO 6 , and the morphology of particles formed during hydrothermal treatment depended on the hydrothermal medium's pH.
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