Upconversion luminescence and Visible-Infrared Properties of β-NaLuF4:Er3+ Microcrystals Synthesized by the Surfactant-Assisted Hydrothermal Method
Figure 7
(a) Photoluminescence excitation spectra () of β-NaLuF4:12 mol%Er3+ with hexagonal prisms morphology; (b) visible photoluminescence spectra of β-NaLuF4:12 mol%Er3+ under 416 nm excitation (black line), under 1.54 μm excitation (red line), and under 416 nm and 1.54 μm dual excitation (blue line) (, ); (c) absolute enhancement () for the as-prepared β-NaLuF4:12 mol%Er3+ crystals using different surfactants with increasing 1.54 μm laser power under 416 nm and 1.54 μm dual excitation.
