Abstract
The process of preparing Er 3+ -doped barium borosilicate glass samples with different dopant concentrations using a high-temperature sintering technique is discussed. Under a 978-nm semiconductor laser excitation, the energy transfer from 2 H11/2 to 4 I15/2 and 4 S3/2 to 4 I15/2 caused by the transitions of Er 3+ ions yields a 534- and a 549-nm green fluorescence. The relationship between the absolute temperature T and the fluorescence intensity ratio R of these two up-conversion photo- luminescence spectra is discussed and fitted to the exponential func- tion R = 1.782exp(−328/T) in the temperature range of 298 to 698 K. The sensitivity of the samples descends monotonously from 0.00219 to 0.00075 K −1 with the temperature increase from 298 to 698 K. The data are of undoubted repeatability, and the proposed doped glass is suitable for sensitive, high-temperature measurement. C 2011 Society of Photo-Optical
Published Version
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