Excitation dependence and independence of photoluminescence in carbon dots and graphene quantum dots: insights into the mechanism of emission
Abu Bakar Siddique, Syed Minhaz Hossain, Ashit Kumar Pramanick, Mallar Ray
Abstract
), and above this threshold the emission becomes excitation dependent. We also demonstrate that a similar trend is apparent for nearly all variants of 0D carbon reported in the literature. The threshold wavelength correlates well with the excitation wavelength for the most intense emission and the photoluminescence excitation peaks, suggesting a common origin of light emission in these carbon dots. The findings provide important clues for developing a unified general picture for understanding the light emission mechanism in 0D carbon nanostructures.
Topics & Concepts
PhotoluminescenceExcitationQuantum dotMaterials scienceGraphenePhotoluminescence excitationCarbon fibersEmission spectrumOptoelectronicsPhysicsNanotechnologySpectral lineQuantum mechanicsComposite numberAstronomyComposite materialCarbon and Quantum Dots ApplicationsGraphene research and applicationsLuminescence and Fluorescent Materials