Abstract
Confocal fluorescence microscopy has been used to study the fluorescence spectrum and fluorescence decay of a single Pr 3+ ion incorporated into a Y 2SiO 5 nanocluster prepared by sol–gel method. Two emission spectra of Y 2SiO 5:Pr 3+ nanoclusters characterized by different size (20 and 5 nm) has been observed. Depending on the annealing time, persistent transition between two emission spectra was not established. It has been found that the cluster exhibits essential distinctions from the corresponding bulk crystal regarding the splitting of Pr 3+ terms and a suppression of phonon relaxation between crystal-field components of the 1 D 2 term.
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