Abstract
Abstract LiYbF 4 : Er 3+ octahedral microcrystals have been successfully prepared through a facile hydrothermal method assisted with EDTA (ethylenediaminetetraacetic acid). X-ray diffraction (XRD), scanning electron microscopy (SEM), transmission electron microscopy (TEM), high-resolution transmission electron microscopy (HRTEM), Fourier transform infrared spectroscopy (FTIR), thermogravimetric and differential scanning calorimeters (TG-DSC), photoluminescence (PL) spectra are used to characterize the samples. Under 976 nm excitation, the upconversion (UC) luminescence emission spectra of LiYbF 4 : Er 3+ microcrystals show the characteristic Er 3+ emissions. The results show that the infrared light emissions at 792 nm of 4 I 9/2 → 4 I 15/2 are dominantly strong unusually, while the green emissions at 526 and 545 nm assigned to 2 H 11/2 → 4 I 15/2 and 4 S 3/2 → 4 I 15/2 , respectively, and the red emission at 667 nm of 4 F 9/2 → 4 I 15/2 are relatively weaker. Most importantly, the samples show more efficient luminescence with further heat treatment.
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