Deep Ultraviolet Photoluminescence of Water-Soluble Self-Passivated Graphene Quantum Dots
- 5 May 2012
- journal article
- research article
- Published by American Chemical Society (ACS) in ACS Nano
- Vol. 6 (6), 5102-5110
- https://doi.org/10.1021/nn300760g
Abstract
Glucose-derived water-soluble crystalline graphene quantum dots (GQDs) with an average diameter as small as 1.65 nm (∼5 layers) were prepared by a facile microwave-assisted hydrothermal method. The GQDs exhibits deep ultraviolet (DUV) emission of 4.1 eV, which is the shortest emission wavelength among all the solution-based QDs. The GQDs exhibit typical excitation wavelength-dependent properties as expected in carbon-based quantum dots. However, the emission wavelength is independent of the size of the GQDs. The unique optical properties of the GQDs are attributed to the self-passivated layer on the surface of the GQDs as revealed by electron energy loss spectroscopy. The photoluminescence quantum yields of the GQDs were determined to be 7–11%. The GQDs are capable of converting blue light into white light when the GQDs are coated onto a blue light emitting diode.Keywords
This publication has 36 references indexed in Scilit:
- Bottom-Up Fabrication of Photoluminescent Graphene Quantum Dots with Uniform MorphologyJournal of the American Chemical Society, 2011
- Electric-field controlled spin in bilayer triangular graphene quantum dotsPhysical Review B, 2011
- Luminscent Graphene Quantum Dots for Organic Photovoltaic DevicesJournal of the American Chemical Society, 2011
- Strongly green-photoluminescent graphene quantum dots for bioimaging applicationsChemical Communications, 2011
- Facile preparation and upconversion luminescence of graphene quantum dotsChemical Communications, 2010
- An Electrochemical Avenue to Green‐Luminescent Graphene Quantum Dots as Potential Electron‐Acceptors for PhotovoltaicsAdvanced Materials, 2010
- Hydrothermal Route for Cutting Graphene Sheets into Blue‐Luminescent Graphene Quantum DotsAdvanced Materials, 2010
- The influence of edge structure on the electronic properties of graphene quantum dots and nanoribbonsNature Materials, 2009
- Tuning of energy levels and optical properties of graphene quantum dotsPhysical Review B, 2008
- Spin qubits in graphene quantum dotsNature Physics, 2007