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- Title
Emissão luminescente no titanato de cálcio dopado com íons de terras-raras.
- Authors
Pereira, S. C.; Paranhos, M. M.; Eduardo, A. C.; Santos, M. A. B.; Li, M. S.; Longo, E.; Motta, F. V.; de Figueiredo, A. T.
- Abstract
Through the polymeric precursor method were synthesized samples Ca0.98Sr0.01X0.01TiO3 (X= Eu3+, Sm3+ and Pr3+), which under different heat treatments were obtained with levels of distinct structural order-disorder. The synthesized materials were characterized by X-ray diffraction, confirming the obtaining of ahomogeneous material with perovskite-type orthorhombic structure. This characterization allowed evaluating the average crystallite size of the samples that varies depending on the rare-earth ion. The results of photoluminescence emission confirmed the presence of this optical phenomenon at room temperature and its relationship to the level of order-disorder structural system. The photoluminescence emission is more intense in samples annealed at 500 ° C (independent on the dopant ion), the variation of the dopant influence on the emission intensity due to charge transfer between the host and emitting rare-earth ion, where the doped with Pr3+ ion has charge transfer more efficient and hence more intense emission in the photoluminescence. Another factor that favors the optical property of the samples is the charge compensation, as it contributes to the increase in structural disorder due to formation of Ca2+ vacancies.
- Subjects
HEATING equipment; X-ray diffraction; DOPING agents (Chemistry); ORDER-disorder models; CRYSTALLINE glazes
- Publication
Ceramica, 2014, Vol 60, Issue 353, p77
- ISSN
0366-6913
- Publication type
Article
- DOI
10.1590/s0366-69132014000100011