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Photoluminescence of Nominally Pure Lithium Niobate Single Crystals Produced by Various Technologies

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Journal of Applied Spectroscopy Aims and scope

Volume and surface photoluminescence of congruent and stoichiometric lithium niobate crystals obtained using various technologies was studied. The luminescence intensity of the stoichiometric crystal was less than that of the congruent one. Volume luminescence of the crystals was mainly caused by NbLi defects while luminescence quenching of the near-surface layer was observed in the long-wavelength spectral region (>500 nm) because of energy scattering in crystal-lattice vibrations and increased luminescence intensity of the \( {\mathrm{Nb}}_{\mathrm{Nb}}^{4+}-{\mathrm{O}}^{-} \) pair. Luminescence bands with maxima at 426 and 446 nm were caused by complex defects in the form of electron–hole pairs \( {\mathrm{Nb}}_{\mathrm{Nb}}^{4+}-{\mathrm{O}}^{-} \) in which the Nb atom was bound to oxygen atoms by covalent and ionic bonds. An increase of the Li/Nb ratio led to a shift of the luminescence bands to shorter wavelengths and a change of the fundamental absorption edge of the studied crystals.

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Authors and Affiliations

  1. Russian Academy of Sciences, I. V. Tananaev Institute of Chemistry and Technology of Rare Elements and Mineral Raw Materials, Subdivision of the Federal Research Center, Kola Science Center, Apatity, 184209, Russia

    N. V. Sidorov, M. V. Smirnov & M. N. Palatnikov

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  1. N. V. Sidorov
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  2. M. V. Smirnov
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  3. M. N. Palatnikov
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Correspondence to N. V. Sidorov.

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Translated from Zhurnal Prikladnoi Spektroskopii, Vol. 87, No. 2, pp. 194–200, March–April, 2020.

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Sidorov, N.V., Smirnov, M.V. & Palatnikov, M.N. Photoluminescence of Nominally Pure Lithium Niobate Single Crystals Produced by Various Technologies. J Appl Spectrosc 87, 212–217 (2020). https://doi.org/10.1007/s10812-020-00986-4

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  • DOI: https://doi.org/10.1007/s10812-020-00986-4

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