3 years ago

Tuning Enhancement Efficiency of Multiple Emissive Centers in Graphene Quantum Dots by Core–Shell Plasmonic Nanoparticles

Tuning Enhancement Efficiency of Multiple Emissive Centers in Graphene Quantum Dots by Core–Shell Plasmonic Nanoparticles
Dayong Jin, Igor Aharonovich, Shujun Wang, Peng Chen, Qin Li, Ashleigh Clapper, Lianzhou Wang
Graphene quantum dots (GQDs) are emerging luminescent nanomaterials for energy, bioimaging, and optoelectronic applications. However, unlike conventional fluorophores, GQDs contain multiple emissive centers that result in a complex interaction with external electromagnetic fields. Here we utilize core–shell plasmonic nanoparticles to simultaneously enhance and modulate the photoluminescence (PL) intensities and spectral profiles of GQDs. By analyzing the spectral profiles, we show that the emissive centers are highly influenced by the proximity to the metal particles. Under optimal spacer thickness of 25 nm, the overall PL displays a four-fold enhancement compared with a pristine GQD. However, detailed lifetime measurements indicate the presence of midgap states that act as the bottleneck for further enhancement. Our results offer new perspectives for fundamental understanding and new design of functional luminescent materials (e.g., GQDs, graphene oxide, carbon dots) for imaging, sensing, and light harvesting.

Publisher URL: http://dx.doi.org/10.1021/acs.jpclett.7b02550

DOI: 10.1021/acs.jpclett.7b02550

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