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White luminescence from sol–gel silica doped with silver

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Abstract

Undoped silica and Ag-doped silica (SiO2) were synthesized by the sol–gel method. The photoluminescence properties as a function of annealing temperature were investigated in detail. The addition of Ag introduced new optical active centres in the sample annealed at 1000 °C, responsible for emission bands at 2.25 eV (550 nm) and 3.26 eV (380 nm) in the SiO2 luminescence spectrum. These new emission bands were related to excess oxygen due to decomposition of Ag2O at high temperatures. The additional luminescence band at 2.25 eV changed the blue emission from pure SiO2 to near white light from Ag-doped SiO2, suggesting that the SiO2:Ag system may be suitable for solid-state lighting applications. The stability of this phosphor under ultraviolet irradiation was investigated.

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Acknowledgments

The authors thank Prof. van Wyk at the University of the Free State Centre for Microscopy for assisting with TEM measurements. This work is based on the research supported by the South African Research Chairs Initiative of the Department of Science and Technology and National Research Foundation of South Africa. The University of the Free State Cluster programme is acknowledged for financial support.

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Authors and Affiliations

  1. Department of Physics, University of the Free State, Bloemfontein, 9300, South Africa

    Abd Ellateef Abbass, H. C. Swart & R. E. Kroon

  2. Department of Physics, Sudan University of Science and Technology, Khartoum, Sudan

    Abd Ellateef Abbass

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  1. Abd Ellateef Abbass
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  2. H. C. Swart
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  3. R. E. Kroon
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Correspondence to R. E. Kroon.

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Abbass, A.E., Swart, H.C. & Kroon, R.E. White luminescence from sol–gel silica doped with silver. J Sol-Gel Sci Technol 76, 708–714 (2015). https://doi.org/10.1007/s10971-015-3825-y

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  • DOI: https://doi.org/10.1007/s10971-015-3825-y

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