ESR of platinum impurity ions in ZnWO4 single crystals

Luminescence spectra and decay kinetics in ZnWO4 and CdWO4 crystals

“…An additional 2 µs-decay component was detected under electron beam excitation. A similar effect was also observed in our previous study of CdWO 4 [8].…”

“…The samples under investigation were the following: a nominally pure ZnWO 4 crystal, ZnWO 4 :Fe (concentration 10 -4 mol%) and ZnWO 4 :Mo (concentration 10 -3 mol%). The samples were grown in the Research Institute for Solid State Physics and Optics, HAS, Budapest, Hungary.…”

“…The absorption bands corresponding to Fe 2+ and Fe 3+ are situated at 2.69 eV and 3.54 eV, respectively [3]. In spite of the extra positive charge of the Fe 3+ , the point symmetry of this center is the highest possible at the Zn site, which implies non-local charge compensation [4]. The Mo 6+ ion substituting for the W 6+ ion is well known and widely studied in wolframite crystals.…”

“…ZnWO 4 and CdWO 4 are widely used as X-ray and γ-ray scintillators for high-energy nuclear spectroscopy and computer tomography. The incorporation of Fe and Mo in ZnWO 4 and CdWO 4 is efficient since the segregation coefficient is large [1,2].…”

“…The incorporation of Fe and Mo in ZnWO 4 and CdWO 4 is efficient since the segregation coefficient is large [1,2]. Therefore, Fe and Mo are the main uncontrolled impurities.…”