Development of Tm-doped CaHfO3 single-crystal-scintillators for application to integrated-type detectors

Abstract Photoluminescence and scintillation properties of Tm:CaHfO 3 single crystals were investigated. From the results of photoluminescence properties, all the Tm:CaHfO 3 samples showed emission bands due to the 4f–4f transitions of Tm 3+ , and the 1.0% Tm:CaHfO 3 sample showed the highest quantum yield among all the samples upon excitation at 360 nm. The afterglow levels at 20 ms after X-ray irradiation for 2 ms were approximately 12 000 ppm. Pulse height spectra using 137 Cs as γ-ray source revealed the 1.0% Tm:CaHfO 3 sample showed the highest light yield of 1250 photons MeV −1 among all the samples.