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Figure 2

From: Plasmonic enhancement and polarization dependence of nonlinear upconversion emissions from single gold nanorod@SiO2@CaF2:Yb3+,Er3+ hybrid core–shell–satellite nanostructures

Figure 2

(a) Emission spectrum of bare CaF2:Yb3+,Er3+ NCs (red) and absorbance spectrum of GNRs in water (blue). (b) Emission spectra of bare CaF2:Yb3+,Er3+ NCs and GNR@SiO2@CaF2:Yb3+,Er3+ nanostructures with different silica spacer thicknesses (the concentration of UCNCs in all samples was fixed at 0.32 mg ml−1). (c) Luminescence enhancement factors for both green and red emission bands as a function of the silica spacer thickness. The enhancement factors were extracted from the emission spectra shown in b. Error bars in the figure represent the standard deviation of three enhancement factors calculated for three measurements. (d, e) UC luminescence decay curves for the d green and e red emissions of GNR@SiO2@CaF2:Yb3+,Er3+ with different silica spacer thicknesses.

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