Crystal growth, optical properties, and α-ray responses of Ce-doped LiCaAlF6 for different Ce concentration

Abstract: Ce 1%, 2%, and 3%-doped LiCaAlF6 (LiCAF) single crystals were grown by the micro-pulling-down method. The crystals were transparent, 2.0mm in diameter and 30–60mm in length. Neither visible inclusions nor cracks were observed. Optical properties, including absorption coefficient, and photoluminescence emission spectra were measured. The strong absorption line was observed at 260nm, and absorption coefficients of this line were proportional to Ce3+ concentration. Emission due to Ce3+ 5d–4f transition peaking around 285nm and 310nm were observed by 260nm excitation. Simulating a neutron irradiation, 241Am 5.5MeV α-ray was used to excite the samples. After a correction of a quantum efficiency of photomultiplier tube and compared with Li–glass scintillator GS20, light yield of 6600ph/n, and 41ns decay were achieved 3% doped. [Copyright &y& Elsevier]