Enhanced Near-Infrared Emission from Carbon Dots by Surface Deprotonation.
Enshan LiuTao LiangElena V UshakovaBingzhe WangBohan ZhangHuiqun ZhouGuichuang XingChunming WangZikang TangSongnan QuAndrey L RogachPublished in: The journal of physical chemistry letters (2020)
Carbon dots (CDs) with efficient excitation and emission in deep-red/near-infrared (NIR) spectral range are important for bioimaging applications. Herein, we develop a simple and effective method to significantly enhance both the absorption and emission of CDs in deep-red/NIR by suppressing nonradiative charge recombination via deprotonation of the CD surface. As compared to aqueous solutions at room temperature, NIR emission of CDs in N,N-dimethylformamide and glycerol experience a 50- and 70-fold increase at -20 °C, respectively, due to enhanced deprotonation ability and viscosity. On the basis of the adjustable NIR fluorescence intensity of CDs, multilevel data encryption in the NIR region is realized by controlling the humidity and the temperature of a CD-ink stamped paper.
Keyphrases
- quantum dots
- fluorescent probe
- photodynamic therapy
- drug release
- room temperature
- fluorescence imaging
- energy transfer
- living cells
- visible light
- drug delivery
- magnetic resonance
- ionic liquid
- solid state
- single molecule
- nk cells
- oxidative stress
- electronic health record
- big data
- dna repair
- high intensity
- magnetic resonance imaging
- deep learning
- artificial intelligence