Abstract
Tb3+/Yb3+ codoped KY3F10 nanocrystals with the average size of 45 nm were synthesized using a facile hydrothermal method. Under the excitation by a 976 nm laser, the codoped samples exhibited intense ultraviolet (5D3 → 7F6) and blue upconversion emissions (5D3 → 7F5) from Tb3+ ions. It was observed for the first time that the intense ultraviolet emission was two times stronger than the green emission of Tb3+, which was about 100 times stronger than the results previously reported. The upconversion mechanism was investigated based on the energy transfer from Yb3+ to Tb3+ and the cross-relaxation process between Tb3+ pairs.
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