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1.
Figure 5

Figure 5. From: Plasmonic Modulation of the Upconversion Fluorescence in NaYF4:Yb/Tm Hexaplate Nanocrystals using Gold Nanoparticles or Nanoshells.

Histograms of lifetimes of (a) upconversion NCs and (b) upconversion NCs with attached gold NPs.

Hua Zhang, et al. Angew Chem Int Ed Engl. ;49(16):2865-2868.
2.
Figure 4

Figure 4. From: Plasmonic Modulation of the Upconversion Fluorescence in NaYF4:Yb/Tm Hexaplate Nanocrystals using Gold Nanoparticles or Nanoshells.

UV-Vis spectra of upconversion NCs (a) with gold nanoseeds and (b) with gold shell at different times.

Hua Zhang, et al. Angew Chem Int Ed Engl. ;49(16):2865-2868.
3.
Scheme 1

Scheme 1. From: Plasmonic Modulation of the Upconversion Fluorescence in NaYF4:Yb/Tm Hexaplate Nanocrystals using Gold Nanoparticles or Nanoshells.

Schematic illustration of surface functionalization, gold NP attachment, and gold nanoshell growth on the upconversion NCs.

Hua Zhang, et al. Angew Chem Int Ed Engl. ;49(16):2865-2868.
4.
Figure 1

Figure 1. From: Plasmonic Modulation of the Upconversion Fluorescence in NaYF4:Yb/Tm Hexaplate Nanocrystals using Gold Nanoparticles or Nanoshells.

Time lapse TEM images of the upconversion NCs during the process of gold seed attachment and shell growth, (a) original, (b–c) with increasing number of attached gold NPs and (d–f) with growing gold nanoshell (Scale Bar: 50 nm).

Hua Zhang, et al. Angew Chem Int Ed Engl. ;49(16):2865-2868.
5.
Figure 2

Figure 2. From: Plasmonic Modulation of the Upconversion Fluorescence in NaYF4:Yb/Tm Hexaplate Nanocrystals using Gold Nanoparticles or Nanoshells.

Room temperature upconversion emission spectra of NaYF4:Yb/Tm NCs during (a) gold seed attachment stage (0–360 min) and (b) gold shell growth stage (0–10 min). (c) Enhancement factors after gold NPs attachment and (d) quenching factors after gold shell growth at different emission wavelengths.

Hua Zhang, et al. Angew Chem Int Ed Engl. ;49(16):2865-2868.
6.
Figure 3

Figure 3. From: Plasmonic Modulation of the Upconversion Fluorescence in NaYF4:Yb/Tm Hexaplate Nanocrystals using Gold Nanoparticles or Nanoshells.

(a) Reflection image of NCs on glass substrate. (b) SEM image of a similar sample prepared on silicon wafer. (c–e) Confocal upconversion fluorescence images of the upconversion NCs dipped into gold seed solution for (c) 0 min, (d) 180 min and (e) 360 min. (f) Histogram of the enhancement factors of 50 bright spots (intensity ratio between (e) and (c)). (Scale Bar: 3 μm for b and 20 μm for a, c, d and e)

Hua Zhang, et al. Angew Chem Int Ed Engl. ;49(16):2865-2868.

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