Crystal structure and optical spectra of Er:NaLa_xYb_(9-x)(SiO_4)_6O_2 (x=0,3,5,7,9) crystals prepared through a hydrothermal routine

摘要

For the first time, nano-scale rods of NaLa_xYb_(9-x)(SiO_4)_6O_2 (x=1,3,5,7,9) crystals (NLS) activated with Er~(3+) have been synthesized through a mild hydrothermal conditions with subsequent calcination. The as-obtained products were characterized by the X-ray diffraction (XRD), scanning electron microscopy (SEM), and Fourier transform infrared spectroscopy (FTIR). The results indicate that the compound has an apatite structure and crystallizes in the hexagonal system, space group P6_3/m. The excitation spectrum and emission spectrum were also emplyed to investigate the optical properties of the nano-rods. The Er~(3+) doped NLS exhibit green/red up-conversion lumenescence under excitation with a diode laser at 980 nm.