0.05, 0.1 and 0.25 mol% Pr (with respect to Lu) doped Lu 2SiO5 (LSO) single crystals were grown by the micro-pulling down (μ-PD) method. The grown crystals were transparent, and a slight segregation of Pr3 was observed both in the crystal cross-section and growth direction. Transparency in the visible wavelength range was about 80% in all the crystals. Intense absorptions related with the Pr 3 4f5d transitions were observed around 230 and 255 nm, and weak absorptions due to the 4f4f transitions were detected around 450 nm. In radioluminescence spectra, the Pr3 5d4f transitions were observed around 275and 310 nm, and emissions due to the 4f4f transition were observed around 500 nm. In the pulse height analysis using 137Cs gamma-ray excitation, Pr 0.1% doped sample showed the highest light yield of 2,800 ph/MeV. In the decay time measurements using different excitation sources (photoluminescence, X- and gamma-ray), two different processes related to the 5d4f emission peaks were found. Fast decay component corresponds to direct excitation of Pr3 (46 ns) and slower component (25 ns) reflects the energy migration process from the host lattice to the emission center.
|ジャーナル||Nuclear Instruments and Methods in Physics Research, Section A: Accelerators, Spectrometers, Detectors and Associated Equipment|
|出版ステータス||Published - 2011 7月 1|
ASJC Scopus subject areas