Blue cooperative emission in Yb3+ - doped GeO2 - PbO glasses

AUTOR(ES)

Del Cacho, Vanessa Duarte, Kassab, Luciana Reyes Pires, Oliveira, Samuel Leite de, Morimoto, Nilton Itiro

FONTE

Materials Research

DATA DE PUBLICAÇÃO

2006-03

RESUMO

Investigation of the blue cooperative luminescence in a binary composition of GeO2-PbO glasses with different Yb3+ concentrations is reported. High refractive index (1.96) and large transmission window (0.4 up to 5.0 µm) are characteristics of this vitreous system. Luminescence and lifetime measurements in the visible and near infrared regions were performed to investigate the spectroscopic characteristics of the glasses. Visible emission around 507 nm was detected in all samples. The visible emission intensity increases with the Yb2O3 content at least up to 2.0 wt. (%), that represents the maximum Yb2O3 concentration possible for this glass system. The visible lifetimes are about half of their respective near infrared ones, and the blue luminescence comes from a cooperative process. A rate equation was used to describe the behavior of the cooperative emission intensity as a function of Yb2O3 concentration; a good agreement with the calculated and measured cooperative luminescence was achieved.

Documentos Relacionados

• Produção e caracterização de filmes finos de GeO2-PbO.
• Ca2Ge7O16 nanowires grown from CaO and GeO2
• Thermal effects on light emission in Yb3+-sensitized rare-earth doped optical glasses
• Estudo das caracteristicas estruturais e elÃtricas do SrBi2Nb2O9 (SBN) dopado com La2O3, PbO e Bi2O3.
• Estudos espectroscópicos de vidros sódio aluminofosfatos co-dopados com Yb3+ e Tm3+