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Redox properties of a green emitting ZnGa2O4:Mn low voltage cathodoluminescent phosphor

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Abstract

The emission properties of ZnGa2O4:Mn phosphors have been compared for samples prepared via an oxalate gel route and those prepared via a conventional solid synthetic route. The firing conditions were found to be critical for obtaining good emission on account of possible redox processes involving both the Mn2+ activator ion and the host ZnGa2O4 lattice itself. An interesting reversible shift was observed for the CIE coordinates of the cathodoluminescence when the energy of the exciting electron beam was varied. This is explained by increased vibronic excitation of the ZnGa2O4:Mn phosphors at higher electron beam energies, resulting in a greater relative contribution of the vibronic side bands to the green emission.

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Acknowledgements

We are grateful to the Department of Trade and Industry for financial assistance (OPTIFED project).

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Authors and Affiliations

  1. Wolfson Centre for Materials Processing, Brunel University, Uxbridge, Middlesex, UB8 3PH, UK

    R. Withnall, A. L. Lipman, G. R. Fern, A. Rose & J. Silver

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  1. R. Withnall
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  2. A. L. Lipman
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  3. G. R. Fern
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  4. A. Rose
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Correspondence to R. Withnall.

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Withnall, R., Lipman, A.L., Fern, G.R. et al. Redox properties of a green emitting ZnGa2O4:Mn low voltage cathodoluminescent phosphor. J Mater Sci: Mater Electron 17, 745–753 (2006). https://doi.org/10.1007/s10854-006-9167-3

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  • DOI: https://doi.org/10.1007/s10854-006-9167-3

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