Abstract Key Words: Femtosecond time resolved fluorescent upconversion spectroscopy, Quantum dots, Photoinduced fluorescent decay dynamics. Semiconductor quantum dots (QDs) have shown promising size dependent optical and electronics properties. The size dependent energy tunability of these materials makes them ideal candidates for photovoltaic applications, light emitting diodes, optoelectronic devices and fluorescent labeling. Our studies are focused on investigating the ultrafast florescence decay dynamics of various commercially available QDs. This poster presentation is mainly focused on our studies on ten different core type CdSe quantum dots surface stabilized with octadecyl amine (ODA) ligands and six different CdSe/ZnS core/shell quantum dots surface stabilized with ODA ligands. All the experiments were carried out in solution phase where quantum dots were dispersed in toluene and size varies from 2- 8 nm. Absorption measurements shows absorption maxima varies 460 – 640 nm and emission measurements show Fluorescent maxima varies 480-670 nm for these ten different CdSe quantum dots. Six different CdSe/ZnS core /shell quantum dots have absorption maxima variation 500-640 nm and fluorescence emission maxima variation 500-660 nm. Our studies are focused on extending the studies that have been done so far in the field of CdSe core type quantum dots using fluorescence upconversion spectroscopy. We expand our works to different core/shell type CdSe quantum dots and very first step we studied six different CdSe/ZnS core/shell quantum dots. With these studies we intend to offer a better and complete insight about photoinduced fluorescent dynamics of these core/shell quantum dots. These studies were carried out using femtosecond time resolved fluorescent upconversion spectroscopy, anisotropy decay calculations, time correlated single photon counting (TCSPC) and fluorescence lifetime measurements. *Corresponding author: - mahinda@nmt.edu

Ultrafast photoinduced dynamics in CdSe and CdSe/ZnS quantum dots using femtosecond time-resolved fluorescence upconversion spectroscopy

252nd National Meeting (2016)

The official archive and repository for all ACS Meetings & Expositions abstracts and select posters or presentations.