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In this work, the growing process of Yb-doped YAG crystals is modified to achieve stoichiometric YbAG samples with a minimum quenching of the Yb3+-fluorescence. The best samples were grown by the Czochralski technique from rhenium-crucibles under reducing atmosphere (H2+N2). The as-grown YbAG crystals are of light blue color due to Yb2+-centers. The fluorescence lifetime of Yb3+ after annealing the...
In order to evaluate the quantum efficiency of the cooperative energy transfer (CET) process in the Bi3+–Yb3+ co-doped Gd2O3 phosphor, direct measurements of external quantum yield (QY) were performed along with studies of photoluminescence (PL), photoluminescence excitation (PLE) and photoluminescence decay kinetics. The absolute QY measurements reveal considerable discrepancy between the measured...
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