The Influence of SiO2 Shell on Fluorescent Properties of LaF3 : Nd3+ SiO2 CoreShell Nanoparticles

الملخص EN

Distinct effects of the SiO2 shell on fluorescence properties of LaF3:Nd3+/SiO2 core/shell nanoparticles were demonstrated by annealling the nanoparticles at different temperatures.

Emission spectra, excitation spectra, and decay curves of the nanoparticles were measured.

A significant improvement of fluorescence intensity was observed for LaF3:Nd3+/SiO2 core/shell nanoparticles annealed at 900∘C.

The phenomenon is ascribed to the change of environment of LaF3:Nd3+ core which is imposed by SiO2 shell.

And the change is confirmed by the excitation spectra.

It provides a useful way to improve fluorescent intensity of the SiO2-coated LaF3:Nd3+ nanoparticles.

The lifetime for nanoparticles annealed at 900∘C shows a slight decrease contrast with nanoparticles annealed at 400 and 600∘C.

This is caused by the higher phonon energy of SiO2 than that of LaF3.