Narrow-band absorption-enhanced quantum dot/J-aggregate conjugates.

نویسندگان

  • Brian J Walker
  • Gautham P Nair
  • Lisa F Marshall
  • Vladimir Bulović
  • Moungi G Bawendi
چکیده

We report narrow-band absorption enhancement of semiconductor nanocrystals via Förster resonance energy transfer from cyanine J-aggregates. These J-aggregated dyes associate electrostatically with short quantum-dot (QD) surface ligands in solution. Energy transfer efficiencies approach unity for this light sensitization and result in a 5-fold enhancement in the QD excitation near the J-aggregate absorption maximum. Because a thin layer of J-aggregates attenuates the same amount of light (at peak absorbance) as a far thicker film of monomer dye, these absorption-enhanced materials may have applications in light-sensitizing applications such as photodetection and optical down-conversion.

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عنوان ژورنال:
  • Journal of the American Chemical Society

دوره 131 28  شماره 

صفحات  -

تاریخ انتشار 2009