Journal of Fluorescence

, Volume 21, Issue 2, pp 539–543

Strong Photoluminescence Enhancement from Colloidal Quantum Dot Near Silver Nano-Island Films

Authors

  • Hagen Langhuth
    • Walter Schottky InstitutTechnische Universität München
    • Walter Schottky InstitutTechnische Universität München
  • Michael Kaniber
    • Walter Schottky InstitutTechnische Universität München
  • Jonathan J. Finley
    • Walter Schottky InstitutTechnische Universität München
  • Ulrich Rührmair
    • Institut für InformatikTechnische Universität München
Original Paper

DOI: 10.1007/s10895-010-0740-z

Cite this article as:
Langhuth, H., Frédérick, S., Kaniber, M. et al. J Fluoresc (2011) 21: 539. doi:10.1007/s10895-010-0740-z

Abstract

We present the fabrication and optical investigation of highly random self-assembled, nano-scale films, probing their influence on the luminescence properties of near surface CdSe/ZnS colloidal quantum dots. When compared to quantum dots distributed on unstructured quartz substrates, the average luminescence intensity is found to be enhanced by a factor of 160×. The silver nanoparticles are prepared using slow thermal evaporation on quartz substrates and post-deposition annealing to produce a randomly-arranged layer of smooth nano-islands. Clear polarization dependent hot spots are observed. Such hot spots deliver a maximal enhancement of the emission intensity of 240× and have a spatial density of (0.050±0.002) μm − 2. The results show that silver nano-island films strongly enhance the optical efficiency of near quantum dots emitters.

Keywords

Quantum dotsSilver nano-islandsSelf-assembled filmsPlasmonic hot spotsSurface sensing

Copyright information

© Springer Science+Business Media, LLC 2010