Synthesis and Upconversion Luminescence of Uniform β-NaYF4:Yb3+/Tm3+ Hexagonal Nanoplates
Abstract:Yb3+ and Tm3+-codoped hexagonal-phase NaYF4 powders were prepared by a facile hydrothermal method. The results of X-ray powder diffraction (XRD) and scanning electron microscopy (SEM) showed that the as-prepared powders were well crystallized nanoplates with high size-uniformity. Under the excitation from a 980 nm laser diode, upconversion (UC) emissions centered at ∼291 nm (1I6 → 3H6), ∼346 nm (1I6 → 3F4), ∼361 nm (1D2 → 3H6), ∼451 nm (1D2 → 3F4), ∼474 nm (1G4 → 3H6), ∼644 nm (1G4 → 3F4), and ∼799 nm (3H4 → 3H6) were observed in the sample. Furthermore, the intensity dependence of UC emissions on excitation power was measured. The results indicated that populating the 1I6, 1D2, 1G4, and 3H4 states were five-photon, four-photon, three-photon, and two-photon UC processes, respectively.
Document Type: Research Article
Publication date: 2011-11-01
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