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. 2022 Dec 21;16(1):61. doi: 10.3390/ma16010061

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© 2022 by the authors.

Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (https://creativecommons.org/licenses/by/4.0/).

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Luminescence spectra for Tm³⁺ in TiO₂-modified germanate glasses. The inset presents luminescence bands registered in spectral range between 620 and 680 nm.