Abstract
Energy migration processes between Yb 3+ ions have been investigated in BaY 2F 8 and YF 3 lattices. It has been found that energy transfer coefficient from Yb 3+ to Tm 3+ ions increases almost linearly with Yb 3+ concentration at low Yb 3+ concentrations and tends to saturate at higher Yb 3+ concentrations. Comparison of the experimental results with calculated results, particularly on Monte Carlo simulation, has enabled to explain the above-mentioned results and to determine several parameters relevant to the migration processes.
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