EPR and photoluminescence properties of Mn(2+)-activated zinc gallate phosphor prepared by urea combustion route and post heat treatment
IR@CGCRI: CSIR-Central Glass and Ceramic Research Institute, Kolkata
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| Title |
EPR and photoluminescence properties of Mn(2+)-activated zinc gallate phosphor prepared by urea combustion route and post heat treatment
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| Creator |
Singh, Vijay
Chakradhar, R P S Rao, J L Kwak, Ho-Young |
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| Subject |
Physical Properties
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| Description |
Mn(2+) activated ZnGa(2)O(4) powder phosphors have been prepared by urea combustion route. Powder X-ray diffraction and scanning electron microscopy (SEM) techniques have been used to characterize the as-prepared and post-treated (900 degrees C, 3 h) phosphors. The morphology shows small particles, voids and pores, with non-uniform shapes and sizes. The EPR spectrum exhibits an intense resonance signal at g approximate to 1.985 with a sextet hyperfine structure (hfs) besides a weak broad signal at g approximate to 4.05 and a hump near g approximate to 2.27. The g approximate to 1.985 resonance is due to Mn(2+) ions in an environment close to tetrahedral symmetry. The resonances at g approximate to 4.05 and 2.27 are attributed to the rhombic surroundings of the Mn(2+) ions. The spin concentration (N) and the paramagnetic susceptibility (%) are evaluated and discussed. It is observed that the intensity of the resonance signal at g approximate to 1.985 increases with decrease in temperature obeying the Boltzmann law. Upon post treatment the intensity of the green emission (lambda(em)=528 nm,(4)T(1)->(6)A(1) transition of Mn(2+) ions) has been increased to 3.35 times and a red shift has been observed. (C) 2011 Elsevier B.V. All rights reserved.
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Elsevier
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| Date |
2011-08
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Article
PeerReviewed |
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application/pdf
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| Identifier |
http://cgcri.csircentral.net/414/1/J_Luminescence__131_(2011)_1789%2D1794.pdf
Singh, Vijay and Chakradhar, R P S and Rao, J L and Kwak, Ho-Young (2011) EPR and photoluminescence properties of Mn(2+)-activated zinc gallate phosphor prepared by urea combustion route and post heat treatment. Journal of Luminescence, 131 (8). pp. 1789-1794. ISSN 0022-2313 |
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http://cgcri.csircentral.net/414/
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