Publication date: 3rd July 2020
Plasmon–exciton coupling is of great importance to many optical devices and applications. One
of the coupling manifestations is plasmon-enhanced fluorescence. Although this effect is
demonstrated in numerous experimental and theoretical works, there are different particle shapes
for which this effect is not fully investigated. In this work electrostatic complexes of gold
nanorods and CdSe/CdZnS quantum dots were studied. Double-resonant gold nanorods have an
advantage of the simultaneous enhancement of the absorption and emission when the plasmon
bands match the excitation and fluorescence wavelengths of an emitter. A relationship between
the concentration of quantum dots in the complexes and the enhancement factor was established.
It was demonstrated that the enhancement factor is inversely proportional to the concentration of
quantum dots. The maximal fluorescence enhancement by 10.8 times was observed in the
complex with the smallest relative concentration of 2.5 quantum dots per rod and approximately
5 nm distance between them. Moreover, the influence of quantum dot location on the gold
nanorod surface plays an important role. Theoretical study and experimental data indicate that
only the position near the nanorod ends provides the enhancement. At the same time, the
localization of quantum dots on the sides of the nanorods leads to the fluorescence quenching.
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