Abstract
Tripod-like β-NaYF4: Ln3+ (Ln = Yb, Er, Tm, Ho) nanocrystals have been successfully synthesized for the first time by solvothermal method. The results revealed that the as-prepared NaYF4: Ln3+ crystals with pure hexagonal phase consisted of tripod-like particles with 300-500 nm in length and 60-80 nm in diameter. The upconversion (UC) luminescence properties of β-NaYF4: Ln3+ samples were investigated in detail. By changing the dopants species (Ln3+), multicolor (green and blue) UC emissions can be obtained in β-NaYF4: Ln3+ under 980 nm laser diode (LD) excitation. In conclusion, the luminescent branched particles should be of wide potential application as building blocks in the future nanoscience and nanotechnology.
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