Eutectic crystal of 0.5% Eu-doped 30LaAlO3-70Al 2O3 (vol %) was prepared by micro-pulling down (μ-PD) technique under nitrogen atmosphere. Being excited at a wavelength of 320 nm, the crystal exhibited intense emission band with a maximum at 450 nm which is corresponding to 4f65d-4f7(8S7/2) transitions of Eu2+. The decay time and fluorescence quantum efficiency (QE) were determined to be about 475 ns and 60%, respectively. When alpha-ray excited the crystal, both Eu2+ 4f65d-4f 7(8S7/2) and Eu3+ 4f 6-4f6 (5D0-7F 1,2) emission peaks were observed at 435 nm and 600 nm. By the pulse height spectra, the relative scintillation light yield of the crystal was about 4% compared with that of BGO commercial scintillator.
- Eu 5d-4f transition
- Eutectic crystal
- Micro-pulling down (μ-PD) technique
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