Defect luminescence and lattice strain in Mn super(2+) doped ZnGa sub(2)O sub(4)

Undoped and Mn super(2+) doped ZnGa sub(2)O sub(4) phosphors were prepared by solution combustion method and characterized by XRD, SEM, luminescence and electron paramagnetic resonance (EPR) techniques. Based on XRD results, it is inferred that, strain in ZnGa sub(2)O sub(4) host lattice increases w...

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Bibliographic Details
Published in:Physica. B, Condensed matter Condensed matter, 2016-06, Vol.491, p.79-83
Main Authors: Somasundarama, K, Abhilasha, K P, Sudarsanb, V, Selvina, PChristopher, Kadamc, R M
Format: Article
Language:English
Subjects:
Condensed matter
Constants
Coupling
Defects
Electron paramagnetic resonance
Lattices
Luminescence
Phosphors
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Summary:Undoped and Mn super(2+) doped ZnGa sub(2)O sub(4) phosphors were prepared by solution combustion method and characterized by XRD, SEM, luminescence and electron paramagnetic resonance (EPR) techniques. Based on XRD results, it is inferred that, strain in ZnGa sub(2)O sub(4) host lattice increases with incorporation of Mn super(2+) ions in the lattice. Mn super(2+) doping at concentration levels investigated, lead to significant reduction in the defect emission and this has been attributed to the formation of higher oxidation states of Mn ions in the lattice. Electron Paramagnetic Resonance studies confirmed that majority of Mn ions exist as Mn super(2+) species and they occupy tetrahedral Zn super(2+) site in ZnGa sub(2)O sub(4) lattice with an average hyperfine coupling constant, A sub(iso) similar to 82 G.
ISSN:0921-4526
DOI:10.1016/j.physb.2016.03.022