RT info:eu-repo/semantics/article
T1 Luminescence in undoped and Nb-doped SrTiO3 crystals: Bulk and surface emission
A1 Dadgostar, Shabnam
A1 Pura Ruiz, José Luis
A1 Serrano Gutiérrez, Jorge
A1 Lepine, Bruno
A1 Schieffer, Philippe
A1 Jiménez López, Juan Ignacio
K1 Cathodoluminescence
K1 Catodoluminiscencia
K1 Photoluminescence
K1 Fotoluminiscencia
K1 Strontium titanate
K1 Titanato de estroncio
AB 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.
PB Elsevier
SN 0921-5107
YR 2022
FD 2022
LK https://uvadoc.uva.es/handle/10324/53801
UL https://uvadoc.uva.es/handle/10324/53801
LA eng
NO Materials Science and Engineering: B, 2022, vol. 283, 115830
NO Producción Científica
DS UVaDOC
RD 14-jul-2024