Effects of Ti doping on scintillation properties of CaZrO₃ single crystals

Abstract

The Ti-doped CaZrO3 single crystals were successfully synthesized. All the samples exhibited a high transmittance up to 80% and an absorption edge derived from the doped Ti. Both the photoluminescence (PL) and scintillation spectra revealed a broad emission band. The PL and scintillation decay curves had two emission components, and these decay time constants were less than 1 μs. All the Ti-doped samples exhibited clear photoabsorption peaks, and the light yield of 1370 photons MeV−1 was obtained in the 1% Ti-doped sample.

Ionizing-radiation-induced Scintillation Characteristics of Ti-doped SrZrO3 Single Crystal

“…The highest PL QY value was approximately three times that of the Ti-doped CaZrO 3 single crystal grown by the FZ method. (20) The Ti-related emission was observed even in the undoped specimen, which was due to the presence of a small amount of Ti in the ZrO 2 raw powder. To further consider the relationship between the PL characteristics and Ti concentration, we calculated the radiative transition rate denoted as k r .…”

“…The lifetime of the Ti-related emission appears to depend on the matrix crystal, but mostly previously reported lifetimes were of μs order. (14,16,20,27) Therefore, considering the emission wavelength and PL lifetime, we attributed the emissions at around 400 nm to charge-transfer (CT) transitions of Ti 4+ -O 2− . (27,28) CT emission generally follows a spin-and dipole-allowed absorption.…”

“…The scintillation properties of Ce-and Ti-doped CaZrO 3 single crystals have been investigated. (20,21) Ti-doped CaZrO 3 clearly showed photoabsorption peaks under 137 Cs γ-ray irradiation. In this study, we focused on SrZrO 3 , which has the same perovskite structure as CaZrO 3 , with the aim of increasing the interaction efficiency with ionizing radiation and improving the scintillation properties of the system.…”