Regensburg 2016 – wissenschaftliches Programm

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MM: Fachverband Metall- und Materialphysik

MM 49: Nanomaterials II: Synthesis

MM 49.3: Vortrag

Donnerstag, 10. März 2016, 10:45–11:00, H39

Carbon Dots: A Unique Fluorescent Cocktail of Polycyclic Aromatic Hydrocarbons — •Florian Ehrat¹, Ming Fu¹, Santanu Bhattacharyya¹, Yu Wang², Jacek Stolarczyk¹, Andrey Rogach², Alexander Urban¹, and Jochen Feldmann¹ — ¹Photonics and Optoelectronics Group, Department of Physics, Ludwig-Maximilians-Universität (LMU), Munich, Germany — ²Department of Physics and Materials Science, City University of Hong Kong, Hong Kong SAR

Carbon dots (CDs) have attracted rapidly growing interest due to their exceptional advantages such as high fluorescence quantum yield, chemical stability and biocompatibility. Recently the fluorescent CDs have been used for bioimaging, photocatalysis, photovoltaics, as light-emitting diodes, and for lasing. However, the intrinsic mechanism and origin of the fluorescence in CDs have not yet been completely understood.

We have recently developed a model system of polycyclic aromatic hydrocarbon (PAH) molecules embedded in a polymer matrix to reproduce the optical properties of CDs.[1] In particular, a large Stokes shift of more than 100 nm as well as excitation wavelength dependent emission properties could be achieved by fine-tuning of the concentration of only three different molecules. Therefore we conclude that these can be seen as the main emissive species within a CD. These results will help to enable specifically tailoring the optical characteristics of CDs.

[1] M. Fu, F. Ehrat, et al., Nano Lett. 2015, 15 (9), 6030-6035.