Energy Transfer Mechanism in Pr-Doped SrF$_{2}$ Crystals
Results of investigation of energy transfer mechanism in SrF2 crystals doped with Pr3+ ions are presented. Temperature dependences of 5d-4f and exciton emission in this material under X-ray excitation, and thermostimulated luminescence (TSL) in temperature range 80-300 K are studied. It has been established that in SrF2-Pr3+ crystals the consecutive electron-hole capture mechanism of energy transfer takes place. Also we found that hole centers made a contribution to energy transfer from primary electrons and holes to Pr3+ ions.
Scintillation properties of pure and Ce3+-doped SrF2 crystals
Abstract In this paper results of scintillation properties measurements of pure and Ce 3+ -doped strontium fluoride crystals are presented. We measure light output, scintillation decay time profile and temperature stability of light output. X-ray excited luminescence outputs corrected for spectral response of monochromator and photomultiplier for pure SrF 2 and SrF 2 -0.3 mol% Ce 3+ are approximately 95% and 115% of NaI–Tl emission output, respectively. A photopeak with a 10% full width at half maximum is observed at approximately 84% the light output of a NaI–Tl crystal after correction for spectral response of photomultiplier, when sample 10 × 10 mm of pure SrF 2 crystal is excited with 662 keV photons. Corrected light output of SrF 2 -0.3 mol% Ce 3+ under 662 keV photon excitation is found at approximately 64% the light output of the NaI–Tl crystal.
Absorption and Fluorescence of Sm2+ in CaF2, SrF2, and BaF2
The absorption and fluorescence of the ${\mathrm{Sm}}^{2+}$ ion have been studied for three host lattices, Ca${\mathrm{F}}_{2}$, Sr${\mathrm{F}}_{2}$, and Ba${\mathrm{F}}_{2}$. Measurements of intensity, linewidth, quantum efficiency, and Zeeman splitting are reported. Energy levels belonging to the $4f$ shell have been identified, and a preliminary analysis of the $4f\ensuremath{\rightarrow}5d$ transitions is presented.