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The fluorescence lifetime was measured. It was found that the fluorescence decay presented the characteristics of second\u2010order exponential decay, for which the contribution from the ions inside the nanocrystal and ions at the interface of the nanocrystal were distinguished. Investigating the experimental results with proposed models, we found that the surface effect had to be eliminated. For rare earth doped LaF<jats:sub>3<\/jats:sub> nanocrystals, real\u2010cavity model well explains the influence of surrounding medium on the fluorescence relaxation rate. 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