Spectroscopic properties of Yb~(3+)-doped PbWO_4 single crystal

摘要

Yb~(3+) -doped PbWO_4 single crystal was grown using modified vertical Bridgman method. X-ray diffraction (XRID) analysis, optical absorption spectra, X-ray excited luminescence (XEL), fluorescence of ~2F_(5/2)->~ 2F_(7/2) and its lifetime at room temperature were investigated. PWO:Yb~(3+) shows the broad absorption of Yb~(3+) (850-1050 nm) and efficient emission (950-1100 nm). Annealing exerts a distinct influence on the PWO:Yb~(3+) crystal, e.g. disappearance of color and annihilation of the absorption in the region around 450-750 nm, meanwhile the absorption of Yb~(3+) ions was enhanced by the annealing treatment. A novel luminescence band on the X-ray excited luminescence spectra of PWO:Yb~(3+) centered at about 500 nm was observed overlapped on that of PWO host.