Growth and spectroscopy of Dy3+ doped in ZnWO4 crystal

Single-crystal ZnWO4:Dy3+ was grown by Czochralski technique. The XRD, absorption spectra as well as fluorescence spectrum are investigated and the Judd–Ofelt intensity parameters Ω2, Ω4, Ω6 are obtained to be 7.76 × 10−20 cm2, 0.57 × 10−20 cm2, 0.31 × 10−20 cm2, respectively. Calculated radiative transition rate, branching ratios and radiative lifetime for different transition levels of ZnWO4:Dy3+ crystals are presented. Fluorescence lifetime of 4F9/2 level is 158 μs and quantum efficiency is 66%.The most intense fluorescence line at 575 nm correlative with transition 4F9/2 → 6H13/2 is potentially for application of yellow lasers.