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Luminescence and EPR studies of Mn-activated SrAl12O19 phosphor prepared by facile combustion approach

IR@CGCRI: CSIR-Central Glass and Ceramic Research Institute, Kolkata


Field	Value

Title	Luminescence and EPR studies of Mn-activated SrAl12O19 phosphor prepared by facile combustion approach

Creator	Singh, Vijay Chakradhar, R P S Rao, J L Kim, Dong-Kuk

Subject	Processing Science

Description	Manganese-activated strontium hexa-aluminate (SrAl12O19) phosphor has been prepared at low temperature (500 degrees C) and in a very short time (<5 min) by urea combustion route. Powder X-ray diffraction pattern showed the presence of hexagonal SrAl12O19 phase. Scanning electron microscopy (SEM) indicated the presence of several particles with sizes of 200 nm. The luminescence of Mn2+ activated SrAl12O19 exhibits a strong green emission peak around 515 nm from the synthesized phosphor particles under excitation (451 nm). The luminescence is assigned to a transition from the upper T-4(1) -> (6)A(1) ground state of Mn2+ ions. EPR investigations also indicated the presence of Mn2+ ions in the prepared material. From the observed EPR spectrum, the spin-Hamiltonian parameters have been evaluated. The magnitude of the hyperfine splitting (A) constant indicates that there exists a moderately covalent bonding between Mn2+ ions and the surrounding ligands. The variation of zero-field splitting parameter (D) with temperature is measured and discussed. The mechanism involved in the generation of a green emission has been explained in detail. (C) 2007 Elsevier B.V. All rights reserved.

Publisher	Elsevier

Date	2008-01-01

Type	Article PeerReviewed

Format	application/pdf

Identifier	http://cgcri.csircentral.net/448/1/chakradhar.pdf Singh, Vijay and Chakradhar, R P S and Rao, J L and Kim, Dong-Kuk (2008) Luminescence and EPR studies of Mn-activated SrAl12O19 phosphor prepared by facile combustion approach. Physica B-Condensed Matter, 403 (1). pp. 120-125. ISSN 0921-4526

Relation	http://cgcri.csircentral.net/448/