Single particle level dynamics of photoactivation and suppression of Auger recombination in aqueous Cu-doped CdS quantum dots
Sharmistha Das, Gourab Rana, Fariyad Ali, Anindya Datta
Abstract
dim/dark to bright particle conversion is observed at higher excitation powers. Dispersive blinking kinetics in undoped QDs reflects the involvement of a broad distribution of trap states. A lesser extent of dispersity is observed for doped QDs, in which hole-capture by Cu-defect states predominates. Excitation fluence dependence of the blinking rate highlights the role of Auger recombination in undoped QDs, which is suppressed significantly upon doping, due to disruption of the electron-hole correlation.
Topics & Concepts
Quantum dotAuger effectAqueous solutionFluenceDopingRecombinationFluorescencePhotochemistryAugerDynamics (music)Auger electron spectroscopyMaterials scienceSpectroscopyParticle (ecology)Chemical physicsMolecular physicsChemistryAtomic physicsOptoelectronicsPhysical chemistryPhysicsOpticsIonGeneNuclear physicsQuantum mechanicsOrganic chemistryGeologyOceanographyAcousticsBiochemistryQuantum Dots Synthesis And PropertiesChalcogenide Semiconductor Thin FilmsNanocluster Synthesis and Applications