Relative Quantum Yield Measurements of Coumarin Encapsulated in Core-Shell Silica Nanoparticles |
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| Authors: | Erik Herz Thomas Marchincin Laura Connelly Daniel Bonner Andrew Burns Steven Switalski and Ulrich Wiesner |
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| Institution: | (1) Department of Materials Science and Engineering, Cornell University, Ithaca, NY 14853, USA;(2) Research Laboratories, Eastman Kodak Company, Rochester, NY 14650, USA;(3) Present address: University of California, San Diego, La Jolla, CA 92093, USA;(4) Present address: Department of Chemical Engineering, Massachusetts Institute of Technology, Cambridge, MA 02139, USA;(5) Present address: GE Global Research, Niskayuna, NY 12309, USA; |
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| Abstract: | Fluorescent silica nanoparticles encapsulating organic fluorophores provide an attractive materials platform for a wide array
of applications where high fluorescent brightness is required. We describe a class of fluorescent silica nanoparticles with
a core-shell architecture and narrow particle size distribution, having a diameter of less than 20 nm and covalently incorporating
a blue-emitting coumarin dye. A quantitative comparison of the scattering-corrected relative quantum yield of the particles
to free dye in water yields an enhancement of approximately an order of magnitude. This enhancement of quantum efficiency
is consistent with previous work on rhodamine dye-based particles. It provides support for the argument that improved brightness
over free dye in aqueous solution is a more general effect of covalent incorporation of fluorescent organic dyes within rigid
silica nanoparticle matrices. These results indicate a synthetic route towards highly fluorescent silica nanoparticles that
produces excellent probes for imaging, security, and sensing applications. |
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