Energy transfer to the Ce3+ centers in Lu3Al5O12:: Ce scintillator

Luminescence spectra and scintillation decays under steady-state and pulsed X-ray excitations, respectively, are presented for undoped and Ce-doped Lu3Al5O12 single crystals at room temperature. The energy transfer from the trapped exciton state towards the Ce3+ centers appears rather inefficient. A negative influence of the shallow trapping states is evidenced, which results in delayed radiative recombination at the Ce3+ centers and slows down the scintillation response of the material. (C) 2004 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim.