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oai:uvadoc.uva.es:10324/546042025-02-05T07:34:11Zcom_10324_1158com_10324_931com_10324_894col_10324_1242

Dadgostar, Shabnam Pura Ruiz, José Luis Serrano Gutiérrez, Jorge Lepine, Bruno Schieffer, Philippe Jiménez López, Juan Ignacio 2022-08-29T09:35:52Z 2022-08-29T09:35:52Z 2022 Materials Science and Engineering: B, 2022, vol. 283, 115830 0921-5107 https://uvadoc.uva.es/handle/10324/54604 10.1016/j.mseb.2022.115830 The luminescence of SrTiO3 depends on the sample type, either doped or stoichiometric, as grown or treated, the excitation conditions, and temperature. The origin of the luminescence emissions, blue, green, and infrared, remains controversial. In particular, the role played by defects, mainly oxygen vacancies, impurities, and self-trapped holes and electrons on the different emissions are far to be elucidated. We present a cathodoluminescence (CL) and photoluminescence (PL) study of undoped and Nb-doped samples. The different excitation conditions of CL and PL permit to distinguish the luminescence emission from the bulk (CL) and from a surface skin region (PL). Significant differences between both techniques are seen for the undoped sample, while the Nb-doped sample presents less differences, highlighting the role played by the surface defects and the doped electrons. The study is complemented by the temperature dependence of the luminescence spectra and the emission due to defects generated by plastic deformation. eng info:eu-repo/semantics/openAccess http://creativecommons.org/licenses/by-nc-nd/4.0/ © 2022 The Authors Attribution-NonCommercial-NoDerivatives 4.0 Internacional Luminescence in undoped and Nb-doped SrTiO3 crystals: Bulk and surface emission info:eu-repo/semantics/article