Microwave dielectric permittivity and photoluminescence of Eu 2O3 doped laser heated pedestal growth Ta 2O5 fibers

• Autor(a) principal: Rubinger, C.P.L.
• Data de Publicação: 2008
• Outros Autores: Costa, L.C., Macatrão, M., Peres, M., Monteiro, T., Costa, F.M., Franco, N., Alves, E., Saggioro, B.Z., Andreeta, M.R.B., Hernandes, A.C.
• Tipo de documento: Artigo
• Idioma: eng
• Título da fonte: Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos)
• Texto Completo: http://hdl.handle.net/10773/6155
• topic: dielectric losses; dielectric materials; doping; europium compounds; fibres; microwave materials; permittivity; photoluminescence; tantalum compounds; transparency

We report the microwave dielectric properties and photoluminescence of undoped and europium oxide doped Ta2O5 fibers, grown by laser heated pedestal growth technique. The effects of Eu2O3 doping 1–3 mol % on the structural, optical, and dielectric properties were investigated. At a frequency of 5 GHz, the undoped material exhibits a dielectric permittivity of 21 and for Eu2O3 doped Ta2O5 samples it increases, reaching up to 36 for the highest doping concentration. Nevertheless, the dielectric losses maintain a very low value. For this wide band gap oxide, Eu3+ optical activation was achieved and the emission is observed up to room temperature. Thus, the transparency and high permittivity make this material promising for electronic devices and microwave applications. © 2008 American Institute of Physics.