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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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.

Item Type: Article
Subjects: Physical Properties
Divisions: Glass
Depositing User: Bidhan Chaudhuri
Date Deposited: 20 Jan 2012 04:45
Last Modified: 25 Feb 2013 08:40

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