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- W2416911594 abstract "Abstract A series of Yb 3+ /Er 3+ codoped transparent oxyfluoride glass ceramics with various amounts of Yb 3+ have been successfully fabricated and characterized. Under 980 nm laser prompting, the samples produce intense red, green and blue up-conversion emissions, and the emission intensities increase with Yb 3+ concentration and heat treatment temperature. Before losing good transparency in the visible region, optimum emission intensities are obtained for the sample with 25 mol% of Yb 3+ at a heat treatment temperature of 680 °C. A possible up-conversion mechanism is proposed from the dependence of emission intensities on pumping power. The fluorescence intensity ratio between the two thermally coupled levels 2 H 11/2 versus 4 S 3/2 was measured with the laser output power of 57 mW to avoid the possible laser induced heating effect. The fluorescence intensity ratio values in the temperature range from 295 K to 723 K can be well fitted with the equation: A exp (−∆ E / k B T ), where A = 6.79 and ∆ E =876 cm −1 . The relative temperature sensitivity at 300 K was evaluated to be 1.4% K −1 . All the results suggest that the Yb 3+ /Er 3+ codoped CaF 2 glass ceramics is an efficient up-conversion material with potential in optical fiber temperature sensing." @default.
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- W2416911594 date "2016-09-01" @default.
- W2416911594 modified "2023-10-12" @default.
- W2416911594 title "Up-conversion luminescence and optical thermometry properties of transparent glass ceramics containing CaF2:Yb3+/Er3+ nanocrystals" @default.
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- W2416911594 doi "https://doi.org/10.1016/j.ceramint.2016.06.002" @default.
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