Abstract
In LaF3:Nd3+, R1-level quenching is found to be more efficient than that of R2 and significantly depends on the overlap of ion-pair transitions involved in energy transfer. The authors also have evidence that the energy shifts of R1 and W1 levels are in opposite directions at high concentrations of Nd3+ in LaF3. S levels fluoresce only when their population is sustained due to thermalisation from the lower R levels. Two ions in D and Y levels undergo energy transfer interaction causing up-converted fluorescence from E levels.
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