Narrow-band absorption-enhanced quantum dot/J-aggregate conjugates.
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.
Walker
Brian J
BJ
Department of Chemistry, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139, USA.
Nair
Gautham P
GP
Marshall
Lisa F
LF
Bulović
Vladimir
V
Bawendi
Moungi G
MG
D000327:Adsorption; D002232:Carbocyanines / Q000737:chemistry; D003102:Colloids; D031541:Fluorescence Resonance Energy Transfer; D008024:Ligands; D053758:Nanoparticles; D045663:Quantum Dots; D012666:Semiconductors; D055672:Static Electricity; D013997:Time Factors
D002232:Carbocyanines; D003102:Colloids; D008024:Ligands