Abstract
A series of Yb3+/Er3+ codoped transparent oxyfluoride glass ceramics with various amounts of Yb3+ have been successfully fabricated and characterized. Under 980nm laser prompting, the samples produce intense red, green and blue up-conversion emissions, and the emission intensities increase with Yb3+ concentration and heat treatment temperature. Before losing good transparency in the visible region, optimum emission intensities are obtained for the sample with 25mol% of Yb3+ 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 2H11/2 versus 4S3/2 was measured with the laser output power of 57mW to avoid the possible laser induced heating effect. The fluorescence intensity ratio values in the temperature range from 295K to 723K can be well fitted with the equation: A exp (−∆E/kBT), where A = 6.79 and ∆E=876cm−1. The relative temperature sensitivity at 300K was evaluated to be 1.4% K−1. All the results suggest that the Yb3+/Er3+ codoped CaF2 glass ceramics is an efficient up-conversion material with potential in optical fiber temperature sensing.
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