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HomeKey Engineering MaterialsKey Engineering Materials Vol. 766Effect of Molten Salts on Synthesis and...

Effect of Molten Salts on Synthesis and Upconversion Luminescence of Ytterbium and Thulium-Doped Alkaline Yttrium Fluorides

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Abstract:

Upconversion luminescence materials have recently received attentions because of theirs light conversion ability from infrared into visible and ultraviolet light. In this work, alkaline yttrium fluoride doped by ytterbium and thulium (AYF₄: 20%Yb³⁺, 0.5%Tm³⁺) were synthesized by molten salt method at 400 °C for 2 hours with different eutectic molten salts, i.e. NaNO₃-KNO₃, NaNO₃-LiNO₃, KNO₃-LiNO₃, and NaNO₃-KNO₃-LiNO₃. Pure hexagonal NaYF₄ microrods were successfully synthesized using eutectic NaNO₃-KNO₃ molten salt. Under 980 nm laser diode excitation, upconversion luminescence in both visible and ultraviolet region was clearly observed. On the other hand, for the use of other eutectic molten salts containing LiNO₃, the mixed phases of tetragonal LiYF₄ and orthorhombic Y₆O₅F₈ were obtained. These powders emitted only visible light with 10 times lower intensity than the hexagonal NaYF₄ microrods synthesized using NaNO₃-KNO₃.

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Traditional and Advanced Ceramics III

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Periodical:

Key Engineering Materials (Volume 766)

Pages:

34-39

DOI:

https://doi.org/10.4028/www.scientific.net/KEM.766.34

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Online since:

April 2018

Authors:

Thanataon Pornpatdetaudom, Karn Serivalsatit*

Keywords:

LiYF₄, Molten Salt, NaYF₄, Upconversion Luminescence

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* - Corresponding Author

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