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Keywords:

  • colloidal nanocrystals;
  • CdSe;
  • Langmuir–Blodgett films;
  • time-resolved photoluminescence;
  • Förster resonant energy transfer;
  • quantum dots
Thumbnail image of graphical abstract

Förster energy transfer plays an important role in spectroscopic rulers, photovoltaics and solid-state light emission, and here is a novel way of controlling it. Using a colloidal quantum dot bilayer system, it is possible to change the transfer rate while maintaining a constant efficiency. The key is a thermal exciton redistribution over the different band-edge states, varying both the Förster and the intrinsic emission rate simultaneously.