Growth and spectroscopy of ZnWO4:Ho3+ crystal

The single crystal of ZnWO4:Ho3+ was grown by Czochralski technique. The XRD, absorption spectra, fluorescence spectrum are presented, and the Judd–Ofelt (J–O) intensity parameters Ω2, Ω4, Ω6 are obtained to be 4.61 × 10−20 cm2, 0.16 × 10−20 cm2, 0.48 × 10−20 cm2, respectively. Calculated radiative transition rate, branching ratios, and radiative lifetime for different transition levels of ZnWO4:Ho3+crystals are presented. The most intense line correlative with the transition 5S2 → 5I8 at 543 nm is potentially used for green solid state laser, and the fluorescence lifetime of this energy level is 14.1 μs.