Preparation and Spectroscopic Properties of pr3+-doped Transparent Glass-ceramic Containing LiYF4 Nanocrystals

摘要

Pr3+-doped transparent oxyfluoride glass-ceramic containing tetragonal LiYF4 nanocrystals has been synthesized by melting-quenching method and subsequent thermal treatment and spectroscopic properties of Pr3+ ions were investigated.The crystalline phase and microstmcture of the LiYF4 nanocrystals were studied by X-ray diffraction (XRD) and transmission electron microscopy (TEM),respectively.Compared with those of Pr3+-doped glass (Pr3+∶PG),the sharp absorption and emission bands of Pr3+-doped glass-ceramic (Pr3+∶GC) reveal parts of Pr3+ ions are incorporated into LiYF4 nanocrystals.The peak absorption cross-section at 443 nm (3H4 → 3P2) adds to 110％ and the full width at half maximum (FWHM) for the band around 443 nm reduces from 22 to 14 nm after crystallization.The fluorescence lifetime of the 3P0 multiplet of Pr3+ ions increases from 5.35 to 11.14 μs after crystallization.The results indicate that this glass-ceramic is promising to be a visible laser material.