Abstract
Ce:Gd2Lu1(Ga,Al)5O12 single crystals were grown by the micro-pulling down (μ-PD) method. All grown crystals were yellow and transparent with 3.0mm in diameter, 15–30mm in length. Neither visible inclusions nor cracks were observed. Luminescence and scintillation properties were measured. The substitution at the Al3+ sites by Ga3+ and at the Lu3+ sites by Gd3+ in garnet structure has been studied. In these crystals, Ce3+ 4f–5d emission is observed with 500–530nm wavelength. The decay accelerates with increasing Ga and Ce concentration. Ce1%: Gd2Lu1Ga3Al2O12 shows the highest emission intensity. The light yield of Ce:Gd2Lu1Ga3Al2O12 sample with 3mmφ×1mm size was around 22,000photon/MeV using calibration from 55Fe direct irradiation peak to APD. Scintillation decay time was around 50ns. The theoretical density is 6.88g/cm3.
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