Abstract
The fluorescence spectrum and decay of isolated Y 2SiO 5:Pr 3+nanocrystals at the glass-air interface were investigated using the confocal fluorescence microscopy and time-resolved techniques. Intense fluorescence from the upper crystal field components of the split 1D 2 term of Pr 3+ was observed. The fluorescence decay is characterized by the non-exponential law t - 1 / 2 which is caused by the back-to-back energy exchange between Pr 3+ electronic states and long-lived nanocrystal phonons. The observed effect is very sensitive to the cluster–substrate interaction and opens a new spectroscopic way to explore the excited states of J-manifolds of RE ions directly.
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