Scintillation properties of Ce doped Gd2Lu1(Ga,Al)5O12 single crystal grown by the micro-pulling-down method

Abstract Ce:Gd 2 Lu 1 (Ga,Al) 5 O 12 single crystals were grown by the micro-pulling down (μ-PD) method. All grown crystals were yellow and transparent with 3.0 mm in diameter, 15–30 mm in length. Neither visible inclusions nor cracks were observed. Luminescence and scintillation properties were measured. The substitution at the Al 3+ sites by Ga 3+ and at the Lu 3+ sites by Gd 3+ in garnet structure has been studied. In these crystals, Ce 3+ 4f–5d emission is observed with 500–530 nm wavelength. The decay accelerates with increasing Ga and Ce concentration. Ce1%: Gd 2 Lu 1 Ga 3 Al 2 O 12 shows the highest emission intensity. The light yield of Ce:Gd 2 Lu 1 Ga 3 Al 2 O 12 sample with 3 mmφ×1 mm size was around 22,000 photon/MeV using calibration from 55 Fe direct irradiation peak to APD. Scintillation decay time was around 50 ns. The theoretical density is 6.88 g/cm 3 .