Luminescence and scintillation properties of Eu-doped 756LiF-12.5AlF3-12.5CaF2 eutectics suitable for thermal neutron detection are reported. The 0.5 and 1.0% Eu-doped eutectics were grown by micro-pulling down (μ-PD) technique. These materials demonstrated two emission bands with maximums at 375 and 430 nm wavelengths under excitation with 250-400 nm wavelength radiation. The emission band at 375 nmwas associated with 4f65d-4f7(8S7/2) transition of Eu2+ in the CaF2 phase, and the 430 nm band could be result of incorporation of Eu2+ into Li3AlF6 and other phases. When alpha-ray excited the eutectics, both Eu2+ 4f65d-4f7(8S7/2) and Eu3+ 4f6-4f6 (5D0-7F1, 2) emission band were detected at 430 nm and 590 nm. The scintillation decay time of the eutectics were determined to be about 540 ns for Eu 0.5% and 380 ns for Eu 1.0%, respectively. According to pulse height spectra registered under 252Cf irradiation, the relative scintillation light yield of the eutectics was observed to be 6000 ph/n (Eu 0.5%) and 2000 ph/ n (Eu 1.0%) when compared to 6Li-loaded glass commercial scintillator.
- Eu 5d-4f transition
- Micro-pulling down (μ-PD) technique
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