Abstract
Dy3+-doped yttrium aluminum garnet (YAG) nanocrystalline powders were synthesized by employing a sol–gel combustion process, in which triammonium citrate was used as both fuel reagent and dispersant. The influence of citrate-to-nitrate molar ratio (0–2) on slurry rheology, phase formation, composition, morphology, and particle size distribution of the Dy:YAG powders was evaluated systematically. The effects of Dy3+ dopant concentration (various from 1 to 3 at.%) and annealing temperature (1000–1300 °C) on the structural and optical properties of Dy:YAG phosphors were also investigated, and the chromaticity coordinates of the phosphor were calculated. Results show that pure Dy:YAG nanopowders were produced by calcining the combustion synthesis products with a citrate–nitrate ratio of 1 at or above 850 °C. Study of the luminescence behavior of the synthesized powders reveals that the phosphors exhibit greenish-blue emission pre-annealing and red emission post-annealing. Furthermore, emission band intensity is increased with an increase in both the Dy3+ dopant concentration and annealing temperature. The Dy:YAG phosphor’s temperature-dependent variation between greenish-blue and red luminescence emission makes it attractive as a potential candidate for applications in temperature monitoring of fuel sprays.
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Acknowledgments
This work was supported by the National Natural Science Foundation of the People’s Republic of China (Grant No. 51002098),the National High Technology Research and Development Program (863) (2014AA8044061B),Science and Technology Project in Shantou (Grant No. 2014SS019) and Key Laboratory of Neutron Physics, CAEP (Grant No. 2014BC01).
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Chen, X., Lu, T., Wu, Y. et al. Ammonium citrate-assisted combustion synthesis and photoluminescence properties of Dy:YAG nanophosphors. J Sol-Gel Sci Technol 79, 606–615 (2016). https://doi.org/10.1007/s10971-016-4040-1
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DOI: https://doi.org/10.1007/s10971-016-4040-1