Publication date: 15th December 2025
Colloidal quantum dots (QDs) are often exploited in an ensemble (e.g., as films) making use of their high photoluminescence efficiency and color tunability. Nonetheless, QDs present desirable properties at the nanoscale too, for example: a QD acts as a single-photon emitter, or it can be used for other localized phenomena. Despite this, single QDs present challenges in terms of manipulation. In addition, much like large size optoelectronic devices (> 1 mm), at the nanoscale, light out-coupling and control is of paramount importance. In fact, a vast literature discusses single QDs coupled with on-substrate photonic nanostructures such as antennas, micro-cavities, and waveguides, to impart either directionality, wave polarization or enhance the rate of photon emission. In this talk, I will discuss how large oxide shells (e.g, SiO2, TiO2, etc…) grown around single QDs can be employed to enhance their manipulation at the nanoscale and modify their emission properties. Through a combination of synthetic methods developed via a design-of-experiment approach,1 large SiO2 (diameter > 300nm) nanoparticles embedding a single QD are grown and then used for fabricating single photon emitter arrays2 or monolayers through capillary assembly. The large oxides shells also enable control over the emission of single QDs, modifying the emission wavelength and rate. Finally, the large shells can be employed as a scaffold to grow additional nanostructures, enabling a further degree of functionalization of the embedded QD.
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