Abstract
The present study discusses the synthesis and characterization of rare form of low temperature cubic spinel phase of ZnTiO3, whose synthesis is a challenging task for researchers. Powder XRD pattern confirms the formation of single phase spinel form of ZnTiO3 crystallizes in cubic lattice. The average crystallite size obtained from TEM analysis and Scherrer’ method is about 7–8 nm. Trivalent Eu ions in host lattice are confirmed by XPS spectroscopy. Photoluminescence spectral analysis infers that ZnTiO3:xEu3+ (x = 0.25%, 0.5%, 0.75%, 1%, 1.25%) nanophosphors show strong red emission corresponding to the forced electric dipole transition 5D0–7F2 under near UV excitation. Hypersensitive 5D0–7F2 transition indicates inversion antisymmetry crystal field around Eu3+ environment, favourable to improve red color purity. The type of multipolar interaction responsible for florescence quenching is also discussed. The color co-ordinate of all samples estimated from emission spectra is comparable to the national television standard committee value of red emission. The compositional dependence of Judd–Offlet parameters were evaluated and discussed. Eu doped spinels with defects associated structure shows better luminescent LED applications.
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Acknowledgements
The authors express their conscientious thankfulness to DST-FIST for providing characterization facilities in the Department of Physics, Govt. College for Women, Trivandrum. The authors are grateful to NIIST, Trivandrum, CLIF Kariavattom and STIC, Cochin for providing facilities for the analysis of the prepared samples. The authors Bhagyalekshmi G L and Neethu Sha A P wish to acknowledge University of Kerala, Trivandrum for providing fellowship for doing the research work.
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Bhagyalekshmi, G.L., Neethu Sha, A.P. & Rajendran, D.N. Luminescence kinetics of low temperature nano ZnTiO3:Eu3+ red spinel under NUV excitation. J Mater Sci: Mater Electron 30, 10673–10685 (2019). https://doi.org/10.1007/s10854-019-01413-x
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DOI: https://doi.org/10.1007/s10854-019-01413-x