Supporting Information
Revolutionizing the FRET-Based Light Emission in Core-Shell
Nanostructures via Comprehensive Activity of Surface Plasmons
Saji Thomas Kochuveedu,† Taehwang Son,‡ Yu Min Lee,†Min Young Lee,†Donghyun Kim‡
and Dong Ha Kim*,†
†
Department of Chemistry and Nano Science, Global Top 5 Research Program, Division of
Molecular and Life Sciences, College of Natural Sciences, Ewha Womans University, 52,
Ewhayeodae-gil, Seodaemun-gu, Seoul, Korea.
‡
School of Electrical and Electronic Engineering, Yonsei University, Seoul 120-749, South
Korea
Figure S1. PL spectrum of CdSe QDs and absorption spectrum of dyes showing the extent of
overlap between the two spectra.
Figure S2. TEM images of (a) Au@SiO2, (b) h-SiO2, (c) h-SiO2@CdSe core-shell
nanostructures
Figure S3. Confocal microscope images of (a) h-SiO2@CdSe and (b) Au@SiO2@CdSe. The
red signals indicate the flourescnce of CdSe QDs.
Figure S4. TEM images of Au@SiO2@CdSe nanostructures after developing the second
silica
shell:
(a)
Au@SiO2(10)@CdSe,
(b)
Au@SiO2(10)@CdSe@SiO2(5),
Au@SiO2(10)@CdSe@SiO2(8), (d) Au@SiO2(10)@CdSe@SiO2(10).
(c)
Figure S5. Nomalized electric field intensity distribution of a hollow sphere decorated with
CdSe QDs calculated by FDTD analysis.
Figure S6. Electric field intensity distribution created by the addition of the second silica
shell is calculated by FDTD. NFE due to second silica shell is clearly observed.
Figure S7. TEM images of (a) SiO2 sphere: (b) SiO2@CdSe: (c) SiO2@CdSe@SiO2.
Figure
S8.
PL
spectra
of
Au@SiO2(10)@CdSe@SiO2(8)@Dye
SiO2@CdSe@SiO2(10)@Dye core@shell nanostructures.
and
S9. Calculation of FRET efficiency and Förster radius
1) FRET efficiency (ηFRET ) can be calculated according to the equation (1)
ηFRET = 1 – (FDA / FD)
(1)
where, FDA and FD are the fluorescence intensities of FRET donor with and without acceptor,
respectively.
2) Förster radius (R0) is calculated using the equation (2)
R0= 0.211[κ2n-4QD J(λ)]1/6
(2)
where, κ is the relative special orientation of the donor and acceptor dipoles, which is usually
assumed to be equal to 2/3. n is the refractive index of the medium and QD is the quantum
yield of donor in the absence of acceptor. J(λ) is the overlap integral, which determines the
degree of spectral overlap between the emission of donor and absorbance of acceptor (the
intensity of emission of donor is normalized).