Ultrafast nanometric imaging of energy flow within and between single carbon dots
Huy Nguyen, Indrajit Srivastava, Dipanjan Pan, Martin Gruebele
Abstract
) surface defects, followed by heterogeneous relaxation of individual dots to either long-lived fluorescent states or back to the ground state. We also image the coupling of optical phonons in individual carbon dots with conduction electrons in gold as an ultrafast energy transfer mechanism between two nearby dots. Although individual dots are highly heterogeneous, their averaged dynamics is consistent with previous bulk optical spectroscopy and nanoscale heat transfer studies, revealing the different mechanisms that contribute to the bulk average.
Topics & Concepts
Quantum dotFluorescenceNanotechnologyMaterials scienceFemtosecondNanomaterialsCarbon fibersUltrashort pulseYield (engineering)Quantum yieldResolution (logic)OptoelectronicsOpticsPhysicsLaserComputer scienceArtificial intelligenceMetallurgyComposite materialComposite numberCarbon and Quantum Dots ApplicationsGraphene research and applicationsLuminescence and Fluorescent Materials