On the upconversion fluorescence in carbon nanodots and graphene quantum dots.

@article{Wen2014OnTU,
  title={On the upconversion fluorescence in carbon nanodots and graphene quantum dots.},
  author={Xiaoming Wen and Pyng Yu and Yon-Rui Toh and Xiaoqian Ma and Jau Tang},
  journal={Chemical communications},
  year={2014},
  volume={50 36},
  pages={
          4703-6
        }
}
Upconversion fluorescence has been frequently cited as an important feature in carbon nanodots (CNDs) and graphene quantum dots (GQDs); and some mechanisms and potential applications have been proposed. Contrary to such a general belief, we demonstrate in this report no observable upconversion fluorescence based on five different synthesized CNDs and GQDs. We confirm that the so-called upconversion fluorescence actually originates from the normal fluorescence excited by the leaking component… 
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