Temperature quenching of Ce3+ impurity ion fluorescence in Y2O2S: Spatial confinement effect in multiphonon relaxation

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Abstract

The non-radiative decay of the 5d excited state of Ce3+ ions in Y2O2S was studied with fluorescence spectroscopy. It is shown that temperature quenching of Ce3+ ion fluorescence is due to high-order multiphonon relaxation. The direct evidence of spatial confinement effect in multiphonon relaxation was obtained: relaxation is more efficient in nanoparticles than in micron-sized particles.

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