Singh, Vijay and Chakradhar, R P S and Rao, J L and Kim, Dong-Kuk (2009) EPR and luminescence properties of LiGa(5)O(8):Mn green emitting phosphor. Journal of Luminescence, 129 (7). pp. 755-759. ISSN 0022-2313

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Green emitting LiGa(5)O(8):Mn powder phosphor has been prepared in a short time by solution combustion method. Powder X-ray diffraction pattern indicated a dominant phase of LiGa(5)O(8) with another secondary LiGaO(2) phase. Morphology aspects were studied by using field emission scanning electron microscopy. Upon UV light excitation (296 nm), the phosphor exhibits a strong green luminescence (510 nm), which corresponds to the (4)T(1)->(6)A(1) transition of Mn(2+) ions in an environment close to tetrahedral symmetry. EPR spectrum exhibits resonance signals characteristic of Mn(2+) ions. It is observed that the spin-Hamiltonian parameters g and A do not vary with temperature. The magnitude of the hyperfine splitting constant (A) in the present study indicates that there exists a moderately covalent bonding between Mn(2+) ions and the surrounding ligands. The zero-field splitting parameter (D), spin concentration (N) and paramagnetic susceptibility (chi) have also been evaluated. (C) 2009 Elsevier B.V. All rights reserved.

Item Type: Article
Uncontrolled Keywords: Combustion; XRD; SEM; EPR; Mn(2+) ions; Photoluminescence; Phosphors
Subjects: Engineering Materials
Divisions: Glass
Depositing User: Bidhan Chaudhuri
Date Deposited: 02 Mar 2012 05:35
Last Modified: 02 Mar 2012 05:35

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