Journal
ACS NANO
Volume 5, Issue 2, Pages 1328-1334Publisher
AMER CHEMICAL SOC
DOI: 10.1021/nn1030324
Keywords
localized surface plasmons; excitons; fluorescence anisotropy; resonators; semiconductor quantum dots; layer-by-layer assembly; nanocomposites
Categories
Funding
- EU
- BMBF [TUR 09/001]
- TUBITAK [106E020, 107E297, 107E088, 109E002, 109E004, 110E010, 110E217]
- ESF-EURYI
- TUBA-GEBIP
- [NRF-RF-2009-09]
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We propose and demonstrate a nanocomposite localized surface plasmon resonator embedded Into an artificial three-dimensional construction. Colloidal semiconductor quantum dots are assembled between layers of metal nanoparticles to create a highly strong plasmon-exciton interaction in the plasmonic cavity. In such a multilayered plasmonic resonator architecture of isotropic CdTe quantum dots, we observed polarized light emission of 80% in the vertical polarization with an enhancement factor of 4.4, resulting in a steady-state anisotropy value of 0.26 and reaching the highest quantum efficiency level of 30% ever reported for such CdTe quantum dot solids. Our electromagnetic simulation results are In good agreement with the experimental characterization data showing a significant emission enhancement in the vertical polarization, for which their fluorescence decay lifetimes are substantially shortened by consecutive replication of our unit cell architecture design. Such strongly plasmon-exciton coupling nanocomposites hold great promise for future exploitation and development of quantum dot plasmonic biophotonics and quantum dot plasmonic optoelectronics.
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