High-efficiency carrier multiplication and ultrafast charge separation in semiconductor nanocrystals studied via time-resolved photoluminescence

Article Abstract:

Novel methods are proposed for studying multiple exciton generation from a single photon absorption event (carrier multiplication) in semiconductor nanocrystals (or nanocrystal quantum dots) that are complementary to the transient absorption method. The combination of transient absorption and time-resolved photoluminescence (PL) studies has shown that charge transfer between a CdSe nanocrystal and a Ru-based catalyst model compound takes place on a time scale that is faster than Auger recombination time constants.

Analysis, Optical properties, Photoluminescence

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Poly(allylamine)-encapsulated water-soluble CdSe nanocrystals

Article Abstract:

The water-soluble CdSe nanocrystal/poly(allylamine) clusters are prepared using 3-amino-1-propanol as a compatibilizing agent. It is found that decreasing the pH value below 12 resulted in dramatic reduction in PL brightness, despite cluster densification due to partial ionization and dissolution of the amine-based NC surface-capping agents.

Plastics Material and Resin Manufacturing, Plastics materials and resins, Water Soluble Plastics, Water-soluble polymers

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