Photoluminescence of sol–gel synthesized PZT powders
| Autor: | M. C. Rodríguez-Aranda, Rafael Zamorano-Ulloa, J. Heiras, M.A. Hernández-Landaverde, Daniel Ramírez-Rosales, J. M. Yáñez-Limón, F. Calderón-Piñar |
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| Rok vydání: | 2016 |
| Předmět: |
Materials science
Photoluminescence Band gap Biophysics Analytical chemistry 02 engineering and technology Crystal structure Lead zirconate titanate 01 natural sciences Biochemistry law.invention chemistry.chemical_compound Crystallinity symbols.namesake law 0103 physical sciences Electron paramagnetic resonance Perovskite (structure) 010302 applied physics General Chemistry 021001 nanoscience & nanotechnology Condensed Matter Physics Atomic and Molecular Physics and Optics chemistry symbols 0210 nano-technology Raman spectroscopy |
| Zdroj: | Journal of Luminescence. 179:280-286 |
| ISSN: | 0022-2313 |
| DOI: | 10.1016/j.jlumin.2016.07.030 |
| Popis: | A wide band of photoluminescence (PL) emission in structurally disordered lead zirconate titanate (PZT) powders, prepared by sol–gel route, was observed at room temperature excited with a laser line (488 nm). Powders with PbZr 0.53 Ti 0.47 O 3 nominal composition annealed at different temperatures were studied by X-ray diffraction, Raman spectroscopy, Luminescence, Diffuse Reflectance and Electronic Paramagnetic Resonance Spectroscopy (EPR). Our results indicate that the PL response can be associated to order–disorder degree in the perovskite structure, with the exception of samples annealed at low temperature, where a mixture of oxides precursors׳ phases was observed. Furthermore, in quasi-crystalline ordered samples (95% of crystallinity) a small generation of PL remains. In these experiments, the band gap increases with the formation of crystalline structure. EPR experiments were conducted in order to follow the evolution of paramagnetic species with thermal treatment from the mixture of oxides precursors to the perovskite phase and paramagnetic point defects were identified (Pb +3 and Ti +3 ). EPR data suggest the presence of order–disorder within the lattice network. Paramagnetic species are similar in samples treated at 700 and 800 °C, nevertheless the emission intensity decreases by a factor of 6, indicating that the defects associated with PL are not paramagnetic at both temperatures. |
| Databáze: | OpenAIRE |
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