Luminescent and scintillation properties of Ce-doped Tb3Al5O12 crystal grown from Al-rich composition

A Ce-doped Tb3Al5O12 single crystal was successfully synthesized via the floating zone method in an Al-rich composition. In both photoluminescence and scintillation, the emissions were predominantly due to the 5d-4f transitions of Ce3+ peaking around 550 nm, but emissions due to defects and the 4f-4f transitions of Tb3+ were revealed by the time-resolved analyses. The crystal quality and luminescence intensity were sufficiently high such that the crystal was applicable for pulse-height spectrum measurement. Under Cs-137 gamma-ray exposure, a clear photoabsorption peak was observed, and the estimated light yield was 57,000 photons/MeV. (C) 2017 The Japan Society of Applied Physics