特集：「高圧力トピックス」
圧力負荷による無機蛍光材料のバンドギャップおよび蛍光変化の観測
キーワード:
sapphire anvil cell,
spectroscopy,
deep ultraviolet,
scintillator,
phase transition,
luminescence,
fluoride crystal
2026 年 36 巻 2 号 p. 91-98
詳細
2026 年 36 巻 2 号 p. 91-98
Scintillators are used in various fields as radiation detectors. Their properties, such as emission wavelength or decay time, depend on material. Scintillator that has ps decay time is required for time-of-flight measurement. BaF2 crystal has an ultrafast luminescence called cross-luminescence (CL) due to core-valence luminescence with a decay time of 600 ps. CL wavelength has a peak at deep or vacuum ultraviolet range, therefore, it is difficult to detect with photomultipliers. The first-principles calculation predicted the CL shifts to a longer wavelength by applying pressure to the crystal. In this research, we demonstrated the CL shift applying high pressure.
