| Article ID | Journal | Published Year | Pages | File Type |
|---|---|---|---|---|
| 1494986 | Optical Materials | 2011 | 5 Pages |
Eu2+ 0.1, 0.5, 1, and 2 mol% doped LiCaAlF6 single crystalline scintillators were grown by the micro-pulling down (μ-PD) method. Eu2+ 2 mol% doped LiCaAlF6 was also prepared using the Czochralski method. In the transmittance spectra, 4f–5d absorption lines appeared around 200–220 and 290–350 nm. An intense emission at 375 nm due to Eu2+ 5d–4f transition was observed under 241Am α-ray excitation. When 252Cf excited pulse height spectra were measured, Eu 2% doped one showed the highest light yield of 29,000 ph/n with 1.15 μs decay time. Using the 2 inchφ Czochralski grown one coupled with the position sensitive photomultiplier tube covered by Cd mask with various size (1, 2, 3, and 5 mm) pin holes, thermal neutron imaging was examined. As a result, the spatial resolution turned out to be better than 1 mm.
Research highlights► This work describes the first systematic study for Eu doped LiCaAlF6 scintillator. ► Material with different Eu concentrations grown by micro pulling down method. ► Previous reports were few and they did not mention about the Eu content dependence. ► On scintillation efficiencies. ► Additionally, in order to perform a potentiality as an alternative for 3He. ► Neutron detectors, two dimensional imaging capability was also examined.
