Growth and spectroscopy of Ni~(2+) in ZnWO_4 crystal

摘要

Single-crystal ZnWO_4 doped with nickel ion has been grown by the Czochralski technique. The XRD is investigated and the absorption spectrum as well as the emission spectrum is measured. Along crystallographic axes, refractive indices are presented. In octahedral approximation, using the Tanaba-Sugano theory, crystal field split is discussed, and so the Racah parameter B and crystal field parameters 10Dq are calculated. Compared with pure ZnWO_4 (～4 eV), the band edge obtained was 3.7 eV for ZnWO_4:Ni~(2+).