Singh, V and Chakradhar, R P S and Rao, J L and Kwak, H -Y (2010) Green luminescence and EPR studies on Mn-activated yttrium aluminum garnet phosphor. Appllied Physics B-Lasers and Optics, 98 (2-3). pp. 407-415. ISSN 0946-2171

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Abstract

Yttrium aluminum garnet (Y(3)Al(5)O(12)) and Mn activated Y(3)Al(5)O(12) phosphors have been prepared by urea combustion route in less than 5 min. The phosphors are well characterized by powder X-ray diffraction, Scanning electron microscopy and Fourier-transform infrared spectroscopic techniques. Photoluminescence tests on the pure Y(3)Al(5)O(12) showed a strong green emission at 525 nm (2.36 eV) attributed to the strongly allowed transition of F(+) center whereas in Mn(2+) activated YAG the green emission at 519 nm is due to the (4)T(1) (G)->(6)A(1) (S) transition of Mn(2+) ions. EPR studies have been carried out on Mn(2+) activated Y(3)Al(5)O(12) phosphor at 300 and 110 K. From EPR spectra the spin-Hamiltonian parameters have been evaluated. The magnitude of the hyperfine splitting (A) indicates that the Mn(2+) ions are in a moderately ionic environment. The spin concentration (N) and paramagnetic susceptibility (chi) have been evaluated and discussed.

Item Type:	Article
Subjects:	Glass
Divisions:	UNSPECIFIED
Depositing User:	Bidhan Chaudhuri
Date Deposited:	16 Feb 2012 07:50
Last Modified:	16 Feb 2012 07:50
URI:	http://cgcri.csircentral.net/id/eprint/914

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