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Annealing Effect on the Structural, Optical and EPR Properties of UV Radiation Emitting Gd3+ Doped SrAl2O4 Host

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Abstract

An ultraviolet B (UVB) radiation emitting Gd3+ doped SrAl2O4 sample was synthesized by solution combustion. Powder x-ray diffraction, photoluminescence and electron paramagnetic resonance (EPR) techniques were used to characterize the as-prepared and annealed samples. The monoclinic phase of SrAl2O4 was identified. It was observed that by employing thermal annealing, the photoluminescence properties of Gd3+ doped SrAl2O4 sample could be considerably improved. The photoluminescence studies disclosed that the sample emits UVB radiation caused by the 6P5/2 → 8S7/2 and 6P7/2 → 8S7/2 transitions of the Gd3+ ions under 273 nm excitation. EPR studies revealed the presence of Gd3+ in the low symmetry Sr2+ sites in as prepared samples, while in annealed samples the intensity of the signal reduced drastically.

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Acknowledgments

This work was supported by the National Research Foundation of Korea (NRF) grant funded by the Korea government (MSIT) (2018M2B2A9065656).

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Authors and Affiliations

  1. Department of Chemical Engineering, Konkuk University, Seoul, 05029, Korea

    Vijay Singh, N. Singh & M. S. Pathak

  2. Institute of Advanced Research, Gandhinagar, Gujarat, 382007, India

    V. Natarajan

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  1. Vijay Singh
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  2. N. Singh
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Correspondence to Vijay Singh.

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Singh, V., Singh, N., Pathak, M.S. et al. Annealing Effect on the Structural, Optical and EPR Properties of UV Radiation Emitting Gd3+ Doped SrAl2O4 Host. J. Electron. Mater. 48, 238–243 (2019). https://doi.org/10.1007/s11664-018-6760-1

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