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Kamal C.S.,Crystal Growth and Nanoscience Research Center | Mishra R.K.,Bhabha Atomic Research Center | Patel D.K.,Bhabha Atomic Research Center | Patel D.K.,Hebrew University of Jerusalem | And 3 more authors.
Materials Research Bulletin | Year: 2016

Luminescence properties of wurtzite and cubic forms of bulk ZnS have been investigated in detail and compared with that of ZnS nanoparticles. Blue emission observed in both hexagonal and cubic forms of undoped bulk ZnS is explained based on electron-hole recombination involving electron in conduction band and hole trapped in Zn2+ vacancies where as green emission arises due to electron hole recombination from Zn2+ and S2- vacancies. Conversion of wurtzite form to cubic form is associated with relative increase in intensity of green emission due to increased defect concentration brought about by high temperature heat treatment. Copper doping in ZnS, initially leads to formation of both CuZn and Cui (interstitial copper) centers, and latter to mainly CuZn centers as revealed by variation in relative intensities of blue and green emission from the samples. © 2016 Elsevier Ltd. All rights reserved.

PubMed | Anil Neerukonda Institute of Technology and Science Engineering College, University of Louisville, Crystal Growth and Nanoscience Research center and Adikavi Nannaya University
Type: | Journal: Spectrochimica acta. Part A, Molecular and biomolecular spectroscopy | Year: 2017

A low-temperature solution method was utilized to grow single crystals of Eu

Prasad P.V.,Crystal Growth and Nanoscience Research Center | Visweswara Rao T.K.,Crystal Growth and Nanoscience Research Center | Ramachandra Rao K.,Crystal Growth and Nanoscience Research Center | Satya Kamal C.,Crystal Growth and Nanoscience Research Center | Samuel T.,Crystal Growth and Nanoscience Research Center
Spectrochimica Acta - Part A: Molecular and Biomolecular Spectroscopy | Year: 2015

Cadmium doped l-Cysteine hydrochloride monohydrate (Cd2+-C3H7NO2SHClH2O), a non-linear optical crystal, was grown by conventional as well as unidirectional solution growth techniques. While the dimension of the conventionally grown crystal was 16 × 14 × 5 mm3, the dimension of the crystal grown unidirectional method was 32 mm long and 6 mm diameter. The grown crystals were studied using XRD for phase analysis, HRXRD for crystalline perfection and UV-Vis NIR spectroscopy for optical properties. The high crystalline perfection was found in the crystal grown by unidirectional method than that grown by conventional one. FTIR study indicates that Cd2+ ion was coordinated to l-CysteinėHClH2O through S ligand. The nonlinear optical character of the title compound was observed by measuring the SHG efficiency, which is 1.35 times to that of KDP by Kurtz technique. © 2014 Elsevier B.V.

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