The rare-earth-doped orthorhombic BaLu2F8 vacuum-ultra-violet scintillator crystals have been studied. The fast emission around 185 nm with a decay time of several nanoseconds was due to the allowed 5d-4f transition of the Nd3+ ion. The high temperature phase BaLu2 F8 orthorhombic crystals have been prepared by micro-pulling-down method. Unfortunately, no 5d-4f emission (neither from Nd3+ nor from Tm3+) was observed in the crystals under excitation by ionizing radiation at all. This was explained by preferential energy transfer from the host to the lattice defect states. Further improvement of the scintillation efficiency by facilitating the energy transfer from the host matrix to the Nd3+ luminescence center by Tm3+ -codoping was attempted. The energy transfer from the Tm3+ ions to the Nd3+ ones has been proved, however, no improvement of the overall scintillation efficiency was observed.
- Rare-earth doping
- x-ray and gamma-ray detection
ASJC Scopus subject areas
- Nuclear and High Energy Physics
- Nuclear Energy and Engineering
- Electrical and Electronic Engineering