EPR and photoluminescence properties of combustion-synthesized ZnAl(2)O(4):Cr(3+) phosphors
IR@CGCRI: CSIR-Central Glass and Ceramic Research Institute, Kolkata
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| Title |
EPR and photoluminescence properties of combustion-synthesized ZnAl(2)O(4):Cr(3+) phosphors
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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 |
An efficient red emitting ZnAl(2)O(4):Cr(3+) powder phosphor material was prepared at furnace temperatures as low as 500 A degrees C by using the combustion method. The prepared powders were analyzed by X-ray diffraction and scanning electron microscopy techniques. The optical properties were studied using photoluminescence technique. The EPR spectra exhibit an intense resonance signal at g = 3.74 which is attributed to Cr(3+)-Cr(3+) pairs, and the weak resonance signal of at g = 1.97 is attributed to Cr(3+) single ion transition. The spin population (N) has been evaluated as a function of temperature. The excitation spectrum exhibits two broad bands in the visible region which are characteristic of Cr(3+) ions in octahedral symmetry and the emission spectrum exhibits zero-phonon line frequencies along with vibronic frequencies. The crystal field parameter (Dq) and Racah parameters (B and C) have been evaluated and discussed.
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| Publisher |
Springer
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| Date |
2011-04
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| Type |
Article
PeerReviewed |
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| Format |
application/pdf
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| Identifier |
http://cgcri.csircentral.net/411/1/J_Mater_Sc_46_(2011)_2331%E2%80%932337.pdf
Singh, Vijay and Chakradhar, R P S and Rao, J L and Kwak, Ho-Young (2011) EPR and photoluminescence properties of combustion-synthesized ZnAl(2)O(4):Cr(3+) phosphors. Journal of Materials Science, 46 (7). pp. 2331-2337. ISSN 0022-2461 |
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| Relation |
http://cgcri.csircentral.net/411/
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