Giant and broad-band absorption enhancement in colloidal quantum dot monolayers through dipolar coupling

ACS Nano. 2013 Feb 26;7(2):987-93. doi: 10.1021/nn305524a. Epub 2013 Jan 11.

Abstract

The absorption cross section of colloidal quantum dots in close-packed monolayers shows a 4 (CdSe) to 5-fold (PbS) enhancement compared to quantum dots in a dilute dispersion. Quantitative agreement is demonstrated between the value and the size dependence of the enhancement and theoretical model predictions based on dipolar coupling between neighboring quantum dots. This collective optical behavior offers a new degree of freedom in the custom design of optical properties for electro-optical devices.

Publication types

  • Research Support, Non-U.S. Gov't

MeSH terms

  • Absorption
  • Cadmium Compounds / chemistry*
  • Colloids
  • Lead / chemistry*
  • Nanoparticles / chemistry
  • Particle Size
  • Quantum Dots*
  • Selenium Compounds / chemistry*
  • Sulfides / chemistry*

Substances

  • Cadmium Compounds
  • Colloids
  • Selenium Compounds
  • Sulfides
  • lead sulfide
  • Lead
  • cadmium selenide