Abstract
Transparent cerium doped lutetium aluminum garnet (Ce:LuAG) ceramic scintillantors with different Ce3+ concentrations were densified successfully from synthetical nanosized Ce:LuAG powders using co-precipitation method. It was found that the 0.5 mol% Ce: LuAG ceramic exhibited the highest luminescent emission intensity under synchrotron radiation excitation which could be divided into two components centered at 505 and 540 nm under low temperature (50-150 K) conditions originated from the 5d1 excited level (1D) to the 4f ground state of Ce3+ ( 2F 5 / 2; 2F 7 / 2). The quantum efficiency (QE) of the optimized Ce:LuAG ceramic could reach 66.3% under UV excitation of 345 nm. Typical absorption at 170 nm related to possible Lu Al3+ antisite defect (AD) was observed both in Ce3+ doped and undoped LuAG ceramics which formed electron traps disturbing the energy transfer from host lattice to Ce3+ centers, leading to a slow decay component of 109.4 ns in the 0.5 mol% Ce:LuAG transparent ceramic under 137Cs (662 keV) irradiation.
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