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EPR and photoluminescence properties of combustion-synthesized ZnAl2O4:Cr3+ phosphors

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Abstract

An efficient red emitting ZnAl2O4:Cr3+ powder phosphor material was prepared at furnace temperatures as low as 500 °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 Cr3+–Cr3+ pairs, and the weak resonance signal of at g = 1.97 is attributed to Cr3+ 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 Cr3+ 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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Acknowledgements

Dr. Vijay Singh expresses his thanks to the Chung-Ang University, Seoul (South Korea) for providing the Research Assistant Professorship. Dr. RPSC thanks Dr. H. S. Maiti, Director, CGCRI, and Dr. Ranjan Sen, Head, GTL lab, CGCRI for their constant encouragement.

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Authors and Affiliations

  1. Department of Mechanical Engineering, Chung-Ang University, Seoul, 156-756, Korea

    Vijay Singh & Ho-Young Kwak

  2. Glass Technology Laboratory, Central Glass and Ceramic Research Institute (CSIR), Kolkata, 700032, India

    R. P. S. Chakradhar

  3. Department of Physics, Sri Venkateswara University, Tirupati, 517502, India

    J. L. Rao

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  1. Vijay Singh
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  2. R. P. S. Chakradhar
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  3. J. L. Rao
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  4. Ho-Young Kwak
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Correspondence to Vijay Singh or Ho-Young Kwak.

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Singh, V., Chakradhar, R.P.S., Rao, J.L. et al. EPR and photoluminescence properties of combustion-synthesized ZnAl2O4:Cr3+ phosphors. J Mater Sci 46, 2331–2337 (2011). https://doi.org/10.1007/s10853-010-5078-z

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  • DOI: https://doi.org/10.1007/s10853-010-5078-z

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