Abstract
Aluminum garnet crystal has great potential in detecting the high-energy photons and particles for its good scintillation properties and preparing the high time and spatial resolution fiber-array detector for its' easy preparation as single crystal fiber. 0.2 at% Ce: Lu1-xYxAG (x = 0, 0.25, 0.5, 0.75, 1) scintillating single crystal fibers were successfully prepared by laser heated pedestal growth method. The 5d1 energy level of Ce3+ luminescence center is shifting to lower energy and 5d2 energy level of Ce3+ luminescence center is shifting to higher energy with the Y admixture increasing. The photoluminescence decay was fitted by single-exponential decay curve and the scintillation decay were fitted by double-exponential decay curve instead for the different luminescence mechanism. The highest scintillation light yield of 32,457 Ph/MeV and 10,617 Ph/MeV was obtained from the horizontal-direction and longitudinal-direction sides of 0.2 at% Ce: Lu0.25Y0.75AG scintillating single crystal fiber respectively, demonstrating its perspective for application in High Energy Physics.
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