Luminescence properties of Yb3+-Tb3+ co-doped amorphous silicon oxycarbide thin films Flores L.F. es_PE Tucto K.Y. es_PE Guerra J.A. es_PE Töfflinger J.A. es_PE Serquen E.S. es_PE Osvet A. es_PE Batentschuk M. es_PE Winnacker A. es_PE Grieseler R. es_PE Weingärtner R. es_PE 2024-05-30T23:13:38Z 2024-05-30T23:13:38Z 2019
dc.description This work was supported by the Peruvian science foundation CIENCIACTIVA of CONCYTEC and DAAD-CONCYTEC project (2017–2019). The Research Management Office (DGI) of the the Pontificia Universidad Católica del Perú (PUCP) project 492-2017. The research activity was performed in the framework of the doctoral scholarship of L. F. Flores under the contract number 236-2015-FONDECYT. The authors are also thankful to the Center of Materials Characterization (CAM) and the Institute of Corrosion and Protection (ICP) of the PUCP for the EDX, PL and FTIR measurements.
dc.description.abstract This work analyzes the photoluminescence emission of Yb3+ and Tb3+ ions in co-doped silicon oxycarbide thin films, their activation by thermal treatment, and reveals their luminescent properties regarding the energy transfer between them. Three samples of silicon oxycarbide were prepared by rf magnetron sputtering from SiC, Yb and Tb targets in an oxygen/argon atmosphere. The first one is the undoped silicon oxycarbide sample, the second one is Tb single doped, and the last one is the Yb-Tb co-doped sample. All three samples are identified as silicon oxycarbides with a low carbon content using energy dispersive X-ray spectroscopy and Fourier transform infrared spectroscopy. The latter shows the presence of the vibrational modes of Si–C and Si–O bonds. Subsequent annealing treatments up to temperatures of 750 °C led to the rare earths optical activation in the samples. For each annealing step, we present the photoluminescence spectra using an above-bandgap excitation of 325 nm. The Tb3+ and Yb3+ -related luminescence lines were identified. The Yb3+ ions luminescence for the co-doped sample shows concentration quenching above annealing temperatures of 500 °C whereas the Tb3+ ions luminescence intensity remains almost constant. The analysis of the photoluminescence excitation spectra shows the direct excitation of the Tb3+ ions in the Tb-doped samples. A high suppression of the direct excitation of the Tb3+ ions in the Yb-Tb co-doped samples was observed. The energy transfer from Tb3+ to Yb3+ ions in co-doped samples is evidenced, first, by the decrease of the Tb3+ photoluminescence intensity in the co-doped compared to the Tb doped sample. Second, a change from nearly single exponential to nonexponential decay in the Tb3+ photoluminescence decay curves and third, by the reduction of the Tb3+ decay time from 1.2  ms in the Tb-doped sample to 0.5  ms in the Yb-Tb co-doped sample.
dc.description.sponsorship Consejo Nacional de Ciencia, Tecnología e Innovación Tecnológica - Concytec
dc.identifier.scopus 2-s2.0-85064069229
dc.language.iso eng
dc.publisher Elsevier B.V.
dc.relation.ispartof Optical Materials
dc.rights info:eu-repo/semantics/openAccess
dc.subject Ytterbium alloys
dc.subject Amorphous films es_PE
dc.subject Annealing es_PE
dc.subject Binary alloys es_PE
dc.subject Chemical activation es_PE
dc.subject Energy dispersive spectroscopy es_PE
dc.subject Energy transfer es_PE
dc.subject Fourier transform infrared spectroscopy es_PE
dc.subject Luminescence of inorganic solids es_PE
dc.subject Photoluminescence es_PE
dc.subject Rare earths es_PE
dc.subject Silicon carbide es_PE
dc.subject Silicon compounds es_PE
dc.subject Terbium es_PE
dc.subject Terbium alloys es_PE
dc.subject Thin films es_PE
dc.subject Ytterbium es_PE
dc.subject Amorphous silicon oxycarbide es_PE
dc.subject Energy dispersive X ray spectroscopy es_PE
dc.subject Photoluminescence decay curves es_PE
dc.subject Photoluminescence excitation spectrum es_PE
dc.subject Photoluminescence intensities es_PE
dc.subject Photoluminescence lifetime es_PE
dc.subject rf-Magnetron sputtering es_PE
dc.subject Silicon oxycarbides es_PE
dc.subject Amorphous silicon es_PE
dc.title Luminescence properties of Yb3+-Tb3+ co-doped amorphous silicon oxycarbide thin films
dc.type info:eu-repo/semantics/article