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Scintillation properties of Yb$$^{3+}$$-doped YAlO$$_{3}$$ in the temperature range from 4.2 to 175 K

Yasumune, Takashi  ; Kurihara, Masakazu*; Maehata, Keisuke*; Ishibashi, Kenji*; Yoshikawa, Akira*

Yb$$^{3+}$$-doped yttrium-aluminum perovskites (YAP:Yb) are expected to be scintillator materials with high light yield and short scintillation decay time because of their charge transfer (CT) luminescence. Since the CT luminescence of Yb$$^{3+}$$ is strongly affected by thermal quenching, to use YAP:Yb as a scintillator material, it is necessary to measure the scintillation properties of YAP:Yb at low temperatures. Since it is difficult to detect scintillation light at low temperatures, scintillation properties of YAP:Yb characterized by irradiating with $$gamma$$-rays or other radiation below 100 K have not been reported. We conducted measurements of the temperature dependence of emission wavelength spectrum of YAP:Yb by irradiating with $$beta$$-rays from a $$^{90}$$Sr/$$^{90}$$Y source in the temperature range from 4.2 K to 175 K. The emission peak at around 340-350 nm and 500-520 nm were observed in the emission wavelength spectra. The light yield of YAP:Yb was characterized by using an avalanche photodiode in detection of 662 keV $$gamma$$-rays from a $$^{137}$$Cs source in the temperature range from 50 K to 175 K. The light yield increased with decreasing temperature and reached 11,000 photons/MeV at a temperature of 4.2 K.

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