The optical and scintillation properties of 0.5% fixed Ce-doped (Y1-xGdx)AlO3 single crystals have been investigated at three different levels of Gd doping: x = 0.2, 0.4 and 0.6. Single crystal of the Ce3+-doped (Y0.8Gd0.2)AlO3, (Y0.6Gd0.4)AlO3 and (Y0.4Gd0.6)AlO3 were successfully grown by μ-PD technique in nitrogen atmosphere. From X-ray diffraction analysis, no impurity phase was detected for the grown Ce-doped crystals. Ce-doped (Y0.6Gd0.4)AlO3 crystal demonstrated highest fluorescence quantum efficiency (∼ 25%) with improvement of excitation efficiency due to the Gd-doping. When irradiated by the alpha-rays from a 241Am source, all the Ce-doped crystals showed luminescence band that corresponding to 5d (t2g)-4f transition of Ce3+. The scintillation decay time was characterized by two components; the fast component (5-15 ns) is ascribed to 5d-4f transition of Ce3+, while the slow one (100-200 ns) may be related to energy transfer between Ce3+ and Gd3+ ion. According to the result of 137Cs gamma-ray irradiated pulse height spectra compared with BGO scintillator, the relative scintillation light output was found to be about 12200 ± 1220 (Gd 20%) and 16000 ± 1600 (Gd 40%) ph/MeV.
|Number of pages||4|
|Journal||Physica Status Solidi (C) Current Topics in Solid State Physics|
|Publication status||Published - 2012 Dec|
- Ce 5d-4f transition
- Single crystal
ASJC Scopus subject areas
- Condensed Matter Physics