title: Narrow-band absorption-enhanced quantum dot/J-aggregate conjugates.
abstract: 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.
authors: Department of Chemistry, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139, USA.
authors: Brian J
authors: BJ
authors: Walker
authors: Gautham P
authors: GP
authors: Nair
authors: Lisa F
authors: LF
authors: Marshall
authors: Vladimir
authors: V
authors: Bulović
authors: Moungi G
authors: MG
authors: Bawendi
mesh_terms: 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
chemical_list: D002232:Carbocyanines; D003102:Colloids; D008024:Ligands