Surface-plasmon-coupled emission of quantum dots

Ignacy Gryczynski, Joanna Malicka, Wen Jiang, Hans Fischer, Warren C.W. Chan, Zygmunt Gryczynski, Wojciech Grudzinski, Joseph R. Lakowicz

Research output: Contribution to journalArticle

85 Scopus citations

Abstract

We studied surface plasmon-coupled emission (SPCE) of semiconductor quantum dots (QDs). These QDs are water-soluble ZnS-capped CdSe nanoparticles stabilized using lysine cross-linked mercaptoundecanoic acid. The QDs were spin-coated from 0.75% PVA solution on a glass slide covered with 50 nm of silver and a 5-nm protective SiO 2 layer. Excited QDs induced surface plasmons in a thin silver layer. Surface plasmons emitted a hollow cone of radiation into an attached hemispherical glass prism at a narrow angle of 48.5°. This directional radiation (SPCE) preserves the spectral properties of QD emission and is highly p-polarized irrespective of the excitation polarization. The SPCE spectrum depends on the observation angle because of the intrinsic dispersive properties of SPCE phenomenon. The remarkable photostability can make QDs superior to organic fluorophores when long exposure to the intense excitation is needed. The nanosize QDs also introduce a roughness near the metal layer, which results in a many-fold increase of the coupling of the incident light to the surface plasmons. This scattered incident illumination transformed into directional, polarized radiation can be used simultaneously with SPCE to develop devices based on both quantum dot emission and light scattered from surface plasmons on a rough surface.

Original languageEnglish (US)
Pages (from-to)1088-1093
Number of pages6
JournalJournal of Physical Chemistry B
Volume109
Issue number3
DOIs
StatePublished - Jan 27 2005
Externally publishedYes

ASJC Scopus subject areas

  • Physical and Theoretical Chemistry
  • Surfaces, Coatings and Films
  • Materials Chemistry

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  • Cite this

    Gryczynski, I., Malicka, J., Jiang, W., Fischer, H., Chan, W. C. W., Gryczynski, Z., Grudzinski, W., & Lakowicz, J. R. (2005). Surface-plasmon-coupled emission of quantum dots. Journal of Physical Chemistry B, 109(3), 1088-1093. https://doi.org/10.1021/jp046173i