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Synthesis, characterization, optical absorption, luminescence and defect centres in Er3+ and Yb3+ co-doped MgAl2O4 phosphors

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Abstract

The Er3+–Yb3+ co-doped MgAl2O4 phosphor powders have been prepared by the combustion method. The phosphor powders are well characterized by X-ray diffraction (XRD) and energy dispersive (EDX) techniques. The absorption spectrum of Er3+/Er3+–Yb3+ doped/co-doped phosphor powder has been recorded in the UV–Vis–NIR region of the electro-magnetic spectrum. The evidence for indirect pumping under 980 nm excitation of Er3+ from Yb3+ was observed in the MgAl2O4 matrix material. Electron spin resonance (ESR) studies were carried out to identify the defect centres responsible for the thermally stimulated luminescence (TSL) process in MgAl2O4:Er3+ phosphor. Three defect centres were identified in irradiated phosphor by ESR measurements which were carried out at room temperature and these were assigned to an O− ion and F+ centres. O− ion (hole centre) appears to correlate with the low temperature TSL peak at 210 °C and one of the F+ centres (electron centre) is related to the high temperature peak at 460 °C.

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Acknowledgements

Dr. Vijay Singh expresses his thanks to the support of the Hanse-Wissenschaftskolleg, Delmenhorst, Germany. Y.D. Jho acknowledges the support from Fusion-Tech. Developments for THz Info. & Comm. Program of GIST. T. K. Gundu Rao is grateful to FAPESP, Brazil, for the research fellowship.

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Authors and Affiliations

  1. School of Information and Communications, Gwangju Institute of Science and Technology, Gwangju, 500-712, South Korea

    V. Singh & Y.-D. Jho

  2. Department of Applied Physics, Indian School of Mines, Dhanbad, 826004, India

    V. Kumar Rai

  3. Institute of Physics, University of Sao Paulo, 05508-090, Sao Paulo, SP, Brazil

    S. Watanabe & T. K. Gundu Rao

  4. Laboratoire de Photonique Quantique et Moleculaire, Ecole Normale Superieure de Cachan, 61 av. du President Wilson, 94 235, Cachan, France

    L. Badie & I. Ledoux-Rak

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  1. V. Singh
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  4. T. K. Gundu Rao
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Singh, V., Kumar Rai, V., Watanabe, S. et al. Synthesis, characterization, optical absorption, luminescence and defect centres in Er3+ and Yb3+ co-doped MgAl2O4 phosphors. Appl. Phys. B 108, 437–446 (2012). https://doi.org/10.1007/s00340-012-4970-4

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  • DOI: https://doi.org/10.1007/s00340-012-4970-4

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