UvA-DARE is a service provided by the library of the University of Amsterdam (http://dare.uva.nl) UvA-DARE (Digital Academic Repository) On the fluorescence properties of chromophores near metallic nanostructures Plugge, M. Link to publication Citation for published version (APA): Plugge, M. (2012). On the fluorescence properties of chromophores near metallic nanostructures. General rights It is not permitted to download or to forward/distribute the text or part of it without the consent of the author(s) and/or copyright holder(s), other than for strictly personal, individual use, unless the work is under an open content license (like Creative Commons). Disclaimer/Complaints regulations If you believe that digital publication of certain material infringes any of your rights or (privacy) interests, please let the Library know, stating your reasons. In case of a legitimate complaint, the Library will make the material inaccessible and/or remove it from the website. Please Ask the Library: https://uba.uva.nl/en/contact, or a letter to: Library of the University of Amsterdam, Secretariat, Singel 425, 1012 WP Amsterdam, The Netherlands. You will be contacted as soon as possible. Download date: 28 Sep 2020
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UvA-DARE is a service provided by the library of the University of Amsterdam (http://dare.uva.nl)
UvA-DARE (Digital Academic Repository)
On the fluorescence properties of chromophores near metallic nanostructures
Plugge, M.
Link to publication
Citation for published version (APA):Plugge, M. (2012). On the fluorescence properties of chromophores near metallic nanostructures.
General rightsIt is not permitted to download or to forward/distribute the text or part of it without the consent of the author(s) and/or copyright holder(s),other than for strictly personal, individual use, unless the work is under an open content license (like Creative Commons).
Disclaimer/Complaints regulationsIf you believe that digital publication of certain material infringes any of your rights or (privacy) interests, please let the Library know, statingyour reasons. In case of a legitimate complaint, the Library will make the material inaccessible and/or remove it from the website. Please Askthe Library: https://uba.uva.nl/en/contact, or a letter to: Library of the University of Amsterdam, Secretariat, Singel 425, 1012 WP Amsterdam,The Netherlands. You will be contacted as soon as possible.
The UV/Vis absorption spectra were recorded on a double beam Varian Cary 3E
spectrophotometer, spectral range 190 to 900 nm with bandwidths down to 0.2 nm. The spectra were
recorded in rectangular 10 mm quartz cuvettes. The fluorescence excitation and emission spectra
were recorded on a Spex Fluorolog 3 spectrometer, equipped with double grating monochromators
in the excitation and emission channels. The excitation light source was a 450W Xe lamp and the
detector a Peltier cooled R636-10 (Hamamatsu) photomultiplier tube. The fluorescence spectra were
corrected for the wavelength response of the detection system. Quantum yield measurements were
performed on solutions with low absorbance (< 0.1) according to standard procedures.44 Perylene
Orange in toluene was used (ΦF = 0.99) as the reference, since it has good spectral overlap with the
compounds under study.27 Fluorescence decay times were measured using time correlated single
photon counting (TC-SPC) (λexc. = 323 nm from a frequency-doubled cavity-dumped DCM dye layer)
on a set-up that has been described elsewhere.45
Confocal bleaching experiments
The bleaching experiments were conducted using a MicroTime 200 confocal microscope from
PicoQuant GmbH in our laboratory.38 Briefly, the laser system is based on a titanium:sapphire laser
(Chameleon Ultra-II, Coherent). The output of the laser is tuned at 976 nm, at a repetition rate of 80
MHz, which was doubled to generate excitation pulses of 488 nm using a second harmonic generator
(SHG). The excitation light was coupled into the adapted confocal unit via a polarisation maintaining
monomode fibre. An excitation filter (HQ480/40x, Chroma Tech.) was placed in front of the
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excitation beam and a dichroic mirror (Z488 RDC, Chroma Tech.) reflected the excitation light to the
sample. The emission light passed through the dichroic mirror, a notch filter (488NF, Semrock), a
pinhole of 50 µm in diameter and an emission filter (HQ510LP, Chroma Tech.) to a single photon
avalanche diode (SPCM-AQR-13, Perkin Elmer).
Samples of chromophore in a polymer matrix were prepared by spincoating a solution of
approximately 10-6 M of chromophore in toluene with 2% polystyrene onto clean coverglasses, using
standard settings consisting of two successive spincoating programs: 30 s with spinning rate of
1600/min followed by 10 s with spinning rate of 300/min. The solutions that were used in these
experiments were prepared so that the absorption value at 488 nm was roughly equal for all
chromophores. The laser power is expressed in arbitrary units; from previous experiments it is found
that there is a linear relationship between the parameters arbitrary units vs. watts, so that 1,000 a.u. is
estimated at 0.7 μW. Bleaching of the compounds was performed using various excitation powers
from 2,000 a.u. (1.3 μW) to 50,000 a.u. (34 μW) during 600 to 900 seconds. Fluorescence decay times
were fitted using maximum likelihood estimation (MLE) with deconvolution with IRF.
Acknowledgments
Joanna Siekierzycka and Michiel Hilbers are kindly acknowledged for their assistance with the
confocal microscopy experiments.
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