Existing absorption and emission bands of carbon nanodots are mainly located in the ultraviolet-visible region. High-efficiency absorption in the near-infrared region and high fluorescence quantum efficiency near-infrared luminescence cannot be achieved, which severely limits carbon nanodots in biofluorescence imaging, especially green laser pointer application in in vivo near-infrared fluorescence imaging.
In recent years, in order to solve the problem of efficient near-infrared luminescence, Qu Songnan’s group modified the surface of red-light carbon nanodots with electron-withdrawing groups and disordered regulation of the ordered structure of the carbon-based core layer. A new luminous band gap is generated in the band, and carbon nanodots with high-efficiency near-infrared emission under the excitation of near-infrared light are obtained. The fluorescence quantum efficiency reaches 10%, which is the highest value in the world.
It is not difficult to find that Qu Songnan’s group has carried out a lot of research in the field of regulating and application of carbon nanodots in the light emitting green laser pointer. As the first author or corresponding author, Qu Songnan has published a total of 29 SCI papers, including 6 papers with an SCI impact factor of 10 or more, a single SCI paper cited by the first author has a maximum of 390 citations, and a cumulative SCI citation of 1,630. Among them, Qu Songnan’s two articles were selected into ESI (Basic Scientific Indicators Database) hotspots and highly cited papers, and entered the list of the best one-thousandth papers.