Crystal Growth and Nanoscience Research Center

andhra Pradesh, India

Crystal Growth and Nanoscience Research Center

andhra Pradesh, India
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Satya Kamal C.,Crystal Growth and Nanoscience Research Center | Satya Kamal C.,Adikavi Nannaya University | Boddu S.,Bhabha Atomic Research Center | Boddu S.,Institute of Nano Science and Technology | And 4 more authors.
Journal of Luminescence | Year: 2017

Dependence of structural and luminescence properties of nano-crystalline ZnGa2O4 phosphors on the synthesis conditions such as concentration of precursor metal ions and nature of solvents were investigated in detail. Based on XRD and luminescence studies carried out on samples prepared with high and low concentrations of precursor metal ions in ethylene glycol medium, it is established that distortion of structural units along with defects/traps in the lattice, and not the particle size, is responsible for the observed blue shift in emission maxima with decrease in precursor concentrations. Unlike this, a red shift is observed when the synthesis is carried out under identical conditions in water medium. This has been explained based on difference in particle size distributions as confirmed by TEM studies. © 2017 Elsevier B.V.


Satya Kamal C.,Crystal Growth and Nanoscience Research Center | Reddy P.V.S.S.S.N.,Crystal Growth and Nanoscience Research Center | Sujatha K.,Crystal Growth and Nanoscience Research Center | Ramakrishna Y.,Andhra University | Ramachandra Rao K.,Crystal Growth and Nanoscience Research Center
Materials Today: Proceedings | Year: 2016

Mixed colour emissions were observed from Bi3+ and europium (Eu3+) co-doped Y2O3 (Y2O3: Bi, Eu) nanophosphors material prepared by ethylene glycol route. The phase formation, morphological studies were confirmed by XRD, and scanning electron microscopy (SEM) and transmission electron microscopy (TEM). Photoluminescence (PL) emission changed from yellowish-green region to approximately white on heating Y2O3:Bi3+, Eu3+ phosphor powders from 700 to 900°C. The observed emission peaks in PL from phosphor powder materials were assigned to either the broad emission originating from the transition in Bi3+ or the visible emission peaks originating transition from the europium ion. The recorded photoluminescence emission peaks are plotted using CIE coordinates. © 2016 Elsevier Ltd.


Ramachandra Rao K.,Crystal Growth and Nanoscience Research Center | Vijay D.,Government College A | Sujatha K.,Crystal Growth and Nanoscience Research Center | Satya Kamal Ch.,Crystal Growth and Nanoscience Research Center | And 2 more authors.
Materials Today: Proceedings | Year: 2016

MgO:Eu3+(1-3 at%) nanoparticles were synthesized by using polyol mediated technique. Powder XRD for phase conformation, Scanning Electron Microscopy (SEM) analysis for surface morphology and Photoluminescence (PL) emission under UV excitation were recorded with prepared nanoparticles. Powder XRD data revealed the formation of cubic system. The observed visible emission peaks are due to the energy transfer between MgO and Eu3+ ions. Quenching is observed as dopant concentration increases. The color of PL emission peaks are identified using CIE coordinates. © 2016 Elsevier Ltd. All rights reserved.


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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