DOI: https://doi.org/10.29363/nanoge.incnc.2021.032
Publication date: 8th June 2021
Colloidal semiconductor nanocrystals, also called quantum dots (QDs), have exceptional optical properties, such as high absorption cross section and quantum yield, as well as emission spectra that are tunable by changing their size, shape or composition. They are finding numerous applications eg. in displays, imaging… Recently, our group reported the plasmonic coupling of single QD emitters embedded in silica coated with a gold nano-shell with a Purcell factor of 6. The resulting emitters showed enhanced photostability and reduced blinking rates[1]. Here we explore the optical properties of similar objects containing not one but hundreds of QDs in their core. We first synthesize CdSe/CdS/ZnS core/multishell QDs and assemble them into aggregates of controlled sizes (typically 230 +/- 60 nm in diameter) by emulsion/evaporation. The aggregates are then coated with a ca. 10 nm silica shell, functionalized and coated with gold seeds. Various thicknesses of continuous gold shell are then grown using reduction of gold salts in solution.
We have investigated the optical properties of QD assemblies with and without gold nanoshells. These objects display high quantum efficiency, stable and Poissonian emission at room temperature. In addition, enhancement of the photoluminescence decay rate through Förster resonance energy transfer (FRET) is observed from bluer to neighboring redder QDs within the assemblies[2]. We show that polyvinylpyrrolidone can be used to tune the gold reduction rate and the morphology of the gold nano-shell. We are currently examining the coupling effects of the emission from the QD assembly with the gold nano-shell plasmonic resonator.
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