Abstract
Multicolor Lu2O3:Ln (Ln=Eu3+, Tb3+, Yb3+/Er3+, Yb3+/Tm3+, and Yb3+/Ho3+) nanocrystals (NCs) with uniform spherical morphology were prepared through a facile urea-assisted homogeneous precipitation method followed by a subsequent calcination process. X-ray diffraction (XRD), scanning electron microscopy (SEM), transmission electron microscopy (TEM), high-resolution transmission electron microscopy (HRTEM), energy-dispersive X-ray spectrum (EDS), Fourier transformed infrared (FT-IR), thermogravimetric and differential thermal analysis (TG–DTA), and photoluminescence (PL) spectra as well as kinetic decays were employed to characterize these samples. The XRD results reveal that the as-prepared nanospheres can be well indexed to cubic Lu2O3 phase with high purity. The SEM images show the obtained Lu2O3:Ln samples consist of regular nanospheres with the mean diameter of 95nm. And the possible formation mechanism is also proposed. Upon ultraviolet (UV) excitation, Lu2O3:Ln (Ln=Eu3+ and Tb3+) NCs exhibit bright red (Eu3+, 5D0→7F2), and green (Tb3+, 5D4→7F5) down-conversion (DC) emissions. Under 980nm NIR irradiation, Lu2O3:Ln (Ln=Yb3+/Er3+, Yb3+/Tm3+, and Yb3+/Ho3+) NCs display the typical up-conversion (UC) emissions of green (Er3+, 4S3/2,2H11/2→4I15/2), blue (Tm3+, 1G4→3H6) and yellow-green (Ho3+, 5F4, 5S2→5I8), respectively.
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