Abstract
The optical and luminescence properties of La3Ga5SiO14 lanthanum–gallium silicate crystals grown in atmospheres of argon and argon with the addition of oxygen are investigated. The results of calculations of the structure of energy bands are presented, obtained using the CASTEP module in the framework of the generalized gradient approximation and the local density approximation. The width of the optical band gap of the crystal is determined to be \(E_{g}^{{{\text{opt}}}}\) = 5.1 eV. Upon interband excitation, La3Ga5SiO14 crystals grown in argon atmosphere show a luminescence band with a maximum at 430 nm, whereas for a crystal grown in argon with addition of oxygen, two luminescence bands with maxima at 470 and 530 nm dominate in the luminescence spectrum. The nature of the luminescence centers responsible for these bands is discussed with the help of the data for electronic structure calculations. The effect of temperature on the luminescent properties of La3Ga5SiO14 is demonstrated. The presence of traps in La3Ga5SiO14 is shown using thermally stimulated luminescence, and their activation energy is determined.
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ACKNOWLEDGMENTS
The work was supported by the Ministry of Ed-ucation and Science of the Russian Federation in the framework of the State assignment to the University no. 3.2794.2017/PCh, no. 11.5583.2017/ITR (11.5583.2017/7.8), and no. 11.6181.2017/ITR (11.6181.2017/7.8). The optical properties of crystals were studied in the interdepartmental training and testing laboratory of semiconductor materials and dielectrics “Single Crystals and Blanks Based on Them” of the National University of Science and Technology “MISiS.”
The authors are grateful to Prof. M.G. Brik for conducting calculations of the electronic structure. The calculations were carried out using the capabilities of the Wroclaw Center for Networking and Supercomputing (http://www.wcss.pl), grant no. WCSS#10117290.
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Spasskii, D.A., Kozlova, N.S., Kozlova, A.P. et al. Luminescence Properties of Undoped Langasite Crystals. Phys. Solid State 61, 307–314 (2019). https://doi.org/10.1134/S1063783419030314
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DOI: https://doi.org/10.1134/S1063783419030314