Abstract
Single crystals of Tl2LiYCl6 with different mole% of Ce-concentration (0.5 and 5mol%) were presented. This material belongs to Chloro-elpasolite crystal family and was grown by two zone vertical Bridgman technique. X-ray diffraction pattern of the Tl2LiYCl6 single crystal was measured. X-ray diffraction analysis confirmed tetragonal crystal structure. The melting point of the sample was measured by DSC. Typical Ce3+ ion emission spectra were observed when samples were excited by an X-ray source at room temperature. The observed emission spectra were located between 350nm and 530nm wavelength range and peaking around 430nm. Pulse height spectra of the samples under 662keV γ-rays excitation shows improvement in energy resolution with the increase of Ce-concentration in the host lattice. The energy resolutions were obtained to be 10.6% and 7.2% (FWHM) for 0.5% and 5% Ce3+ concentration, respectively. Under γ-ray excitation, a maximum light yield of 23,800±2400ph/MeV was observed for 5% Ce-concentration. Studied samples of Tl2LiYCl6: Ce3+ showed three exponential decay time components under γ-ray excitation. From the measured scintillation properties, we consider this material is a promising scintillator for radiation detection.
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