Plasmonically tunable blue-shifted emission from coumarin 153 in Ag nanostructure random media : a demonstration of fast dynamic surface-enhanced fluorescence
Warrier, Anita R
Date of Issue2014
School of Mechanical and Aerospace Engineering
Indian Institute of Technology Madras
Enhancement of intensity and wavelength tunability of emission are desirable features for light-emitting device applications. We report on the large and tunable blue shift (60 nm) in emission from an environment-sensitive fluorophore (Coumarin153) embedded in Ag plasmonic randommedia. Coumarin 153 having emission at 555 nm, show a systematic blue shift (to 542, 503 and 495 nm) upon infiltration into random media fabricated by Ag nanowires of different aspect ratio (hence, surface plasmon resonances at 426, 445 and 464 nm). The blue shift is due to the fast dynamic surface-enhanced fluorescence mechanism and can be tuned by controlling the surface plasmon resonance and hotspot density in random media. Enhanced emission at desired wavelength is achieved by using nanostructures having higher extinction coefficient but same-surface plasmon resonance. Ag nanostructures of different aspect ratio used for fabricating the random media are synthesized by chemical route.
© 2014 Springer US. This is the author created version of a work that has been peer reviewed and accepted for publication by Plasmonics, Springer US. It incorporates referee’s comments but changes resulting from the publishing process, such as copyediting, structural formatting, may not be reflected in this document. The published version is available at: [http://dx.doi.org/10.1007/s11468-013-9631-x].