Effects of nearest-neighbor pairs on the energy transfer in Nd:YAG

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Abstract
An analysis of the luminescence quenching of 4F3/2 level of Nd3+ in YAG is presented in terms of two models: uniform random distribution and nonuniform placement of activators. It is shown that the correlated placement model for Nd3+ ions, assuming the absence, based on ionic size arguments, of Nd3+ ions in nearest-neighbor sites, is in contradiction with high resolution absorption spectra as well as quantum yield data. The anomalous decay can be described by energy transfer theory for a uniform distribution with a short-range interaction connecting the nearest-neighbor pairs and with dipolar interaction inside the other donor-acceptor pairs.