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Photoluminescence properties and energy transfer in γ-irradiated Dy3+, Eu3+-codoped fluoroaluminoborate glasses

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Abstract

The photoluminescence (PL) properties of singly doped (Dy3+) and codoped (Dy3+, Eu3+) fluoroaluminoborate glasses, with an emphasis on the white light generation, are studied. The γ-irradiation led to the formation of defects in Dy3+-doped glasses and photoreduction of Eu3+ to Eu2+ in codoped (Dy3+, Eu3+) glasses. The electron paramagnetic resonance spectra confirm the presence of divalent europium ions and defects in Dy3+, Dy3+–Eu3+-doped glasses. The FTIR spectra mainly establish the compaction of glass network due to γ-irradiation. From the PL spectra, the intensity ratio of Dy3+ emission bands yellow to blue (4F9/2–6H13/2/4F9/2–6H15/2) defines the site symmetry, covalency, and feasibility of extracting white light. The existence of an energy transfer (ET) from Dy3+ to Eu3+ ions are established due to the decrease in intensity of Dy3+ peaks with an increase of Eu2O3 content. Moreover, the non-exponential nature of decay curves was well fitted with the generalization of Yokota–Tanimoto model for electric dipole-quadrupole (S = 8) interaction that is responsible for ET process from sensitizer (Dy3+) to activator (Eu3+).

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Acknowledgements

The authors would like to acknowledge the central instrumentation facility (CIF), Pondicherry University and University Grants Commission, New Delhi, India for financial support in the form major research Project (No. 39-472/2010). The authors are also thankful to the Sophisticated Analytical Instrument Facility (SAIF), Indian Institute of Technology, Chennai for providing EPR facility.

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  1. Department of Physics, Pondicherry University, Kalapet, Puducherry, 605014, India

    B. Hari Babu & V. V. Ravi Kanth Kumar

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Correspondence to V. V. Ravi Kanth Kumar.

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Hari Babu, B., Ravi Kanth Kumar, V.V. Photoluminescence properties and energy transfer in γ-irradiated Dy3+, Eu3+-codoped fluoroaluminoborate glasses. J Mater Sci 49, 7959–7969 (2014). https://doi.org/10.1007/s10853-014-8486-7

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