Abstract
The single crystals of 0, 0.6, 1, 1.6 and 2mol% Ce doped CaGdAl3O7 (Ce:CGAM) were grown by the Floating Zone method, and investigated on photoluminescence (PL) and scintillation properties. In the PL spectra, a broad emission appeared over 380–500nm under 280 and 360nm excitations with the quantum yield of 33.8–38.8%. Under a vacuum ultraviolet excitation (90nm) using a synchrotron source, non-doped CGAM single crystal showed broad emissions over 250–650nm. The PL decay time profiles followed a monotonic exponential decay with a decay time constant of around 33ns. The scintillation spectra were similar to those of PL. All of the samples exhibited a clear photoabsorption peak and Compton edge in the pulse height spectra measured under 137Cs γ-ray irradiation, and the absolute scintillation light yield (LY) was highest for the 2% Ce-doped sample with the value of 3300±300ph/MeV. The scintillation decay profiles were approximated by a third order exponential decay function, and the extracted decay time of Ce3+ emission component was around 36–44ns. Among all the samples, 2%Ce:CGAM single crystal sample showed the best afterglow level as a scintillator under X-ray irradiation.
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