Abstract
The optimizing Nd/Er ratio for enhancement of broadband near-infrared (NIR) emissions in the Er3+–Nd3+ co-doped SiO2–AlF3–BaF2–TiO2–CaCO3 (SABTC) transparent silicate glass-ceramics containing BaF2 nanocrystals under 808nm excitation was investigated. The broadband NIR emission bands from 850 to 1700nm, which covered the whole O, E, S, C, L and U bands were observed in the Er3+–Nd3+ co-doped glass-ceramics samples, as a result of the overlap of Nd3+-doped emission band centered at 1342nm and the emission from 4I13/2→4I15/2 transition of Er3+ band centered at 1546nm. The NIR emission intensity of Er3+–Nd3+ co-doped bands centered at 895, 1065, 1342 and 1546nm, becomes stronger with varied depending on the mixing ratio of Nd3+ and Er3+ ions, and the full width at half-maximum (FWHM) extending from 1250 to 1700nm could be 340nm. Most NIR emission bands at 1065 and 1546nm are observed for the SABTC-1.0N0.4E glass-ceramics sample, corresponding to Nd/Er ratio of 2.5. At the same time, the energy transfer processes between the Nd3+ and Er3+ ions were also discussed.
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