Abstract
Substantially faster scintillators for radiation detectors are currently in demand for future high-luminosity high energy physics experiments and medical imaging devices. To meet this demand, the excitation transfer through Gd-sublattice in Ce-activated garnet-type scintillators is studied by time-resolved cathodoluminescence (CL) and photoluminescence (PL) techniques. The transfer is evidenced in the different decay rate in CL experiments and after resonant photoexcitation of Ce ions and is confirmed by the simulation of excitation transport through gadolinium subsystem and from Gd3+ to Ce3+ ions using the Monte Carlo technique. Energy levels of Gd3+ involved in the transfer are identified. The comparison of the results of time-resolved PL and CL measurements and the simulations of carrier dynamics revealed that the emission decay in Ce-doped Gd-containing garnets is accelerated by aliovalent codoping due to blocking the excitation transfer via gadolinium subsystem.
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