Visible to near infrared downshifting photoluminescence in Nd3+, Yb3+ co-doped CaTiO3
Por:
Padilla-Rosales I., Chavira E., González F., Jimenez G.L., Falcony C., Morales-Saavedra O.G.
Publicada:
1 ene 2025
Resumen:
The synthesis of Ca1-xNdxTiO3 (x = 0.0, 0.005, 0.01, 0.02, 0.03, and 0.04) and Ca0.99-yNd0.01YbyTiO3 (y = 0.01, 0.02, 0.03, and 0.04) ceramic powders was conducted via polymeric complexation. X-ray diffraction (XRD) analysis revealed an orthorhombic structure in all samples. Diffuse reflectance spectra exhibited a broadband below 400 nm, typical of the CaTiO3 compound related to the ligand-to-metal charge transfer (LMCT) O2- ? Ti4+ fundamental state. Nd3+-doped CaTiO3 samples exhibit intense NIR emission with several well-defined bands at 888 nm, 915 nm, 1076 nm, and 1341 nm, corresponding to the transitions 4F3/2 ? 4I9/2, 4F3/2 ? 4I11/2 and 4F3/2 ? 4I13/2. Photoluminescence emission and diffuse reflectance spectra confirm the overlapping between the emission of Nd3+ and the absorption of Yb3+, supporting the sensitization of Yb3+ via the energy transfer process from Nd3+. The photoluminescence characteristics of the series compound Ca0.99-yNd0.01YbyTiO3 with different Yb3+ concentrations were investigated, and the energy transfer mechanisms from Nd3+ to Yb3+ were elucidated through a detailed excitation spectral analysis and luminescent decay curves. The energy transfer mechanism between Nd3+ and Yb3+ in co-doped CaTiO3 samples was analyzed using the Inokuti-Hirayama model. The findings indicate that a non-radiative electric dipole-dipole mechanism dominates the energy transfer from Nd3+ to Yb3+. The energy transfer efficiency reaches its maximum value of 124 % for the Ca0.96Nd0.01Yb0.03TiO3 sample. Finally, it is shown that Nd3+, Yb3+ co-doped CaTiO3 samples may downshift photons from UV, VIS, and IR efficiently to wavelengths where crystalline-silicon photovoltaic solar cells have their higher spectral responsivity. © 2024 Elsevier Ltd and Techna Group S.r.l.
Filiaciones:
Padilla-Rosales I.:
Instituto de Ciencias Aplicadas y Tecnología, Universidad Nacional Autónoma de México, Circuito Exterior S/N, Ciudad Universitaria, City, 04510, Mexico
Chavira E.:
Instituto de Investigaciones en Materiales, Universidad Nacional Autónoma de México, Ciudad Universitaria, Ciudad de México, Mexico
González F.:
Departamento de Ingeniería de Procesos e Hidráulica, Universidad Autónoma Metropolitana-Iztapalapa, Ciudad de México, A.P. 55-534, Mexico
Jimenez G.L.:
Faculty of Materials Science and Ceramics, AGH University of Krakow. A. Mickiewicza 30, Krakow, 30-059, Poland
Falcony C.:
Centro de Investigación y de Estudios Avanzados Del IPN, Departamento de Física, Av. Instituto Politécnico Nacional 2508, San Pedro Zacatenco, Gustavo A. Madero, CDMX, 07360, Mexico
Morales-Saavedra O.G.:
Instituto de Ciencias Aplicadas y Tecnología, Universidad Nacional Autónoma de México, Circuito Exterior S/N, Ciudad Universitaria, City, 04510, Mexico
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