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- W2028774229 abstract "Transparent glass ceramics containing β-PbF<sub>2</sub>:Er<sup>3+</sup> nanocrystals were obtained through appropriate thermal treatments of a glass of molar composition 60PbGeO<sub>3</sub>-10PbF<sub>2</sub>-30CdF<sub>2</sub> doped with 0.5 mol% Er<sup>3+</sup>. Their optical properties, as well as upconversion processes among erbium ions in the glass and glass ceramic matrix were studied. From absorption spectra, Judd-Ofelt parameters and radiative transition rates for several excited levels were calculated. Emission spectra in the visible and NIR regions were collected, and stimulated emission cross sections were obtained by McCumber theory for the <sup>4</sup>I<sub>13/2</sub>→<sup>4</sup>I<sub>15/2</sub> transition at 1.5 μm. Red and green upconversion emissions were measured in glass and glass ceramics upon excitation at 980 nm; lifetimes were measured in order to assess the upconversion mechanisms." @default.
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- W2028774229 date "2003-11-18" @default.
- W2028774229 modified "2023-10-10" @default.
- W2028774229 title "Transparent Er3+-activated lead fluorogermanate glass ceramics" @default.
- W2028774229 doi "https://doi.org/10.1117/12.525851" @default.
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