Journal
ADVANCED SCIENCE
Volume 6, Issue 17, Pages -Publisher
WILEY
DOI: 10.1002/advs.201900766
Keywords
carbon nanodots; cellular imaging; fluorescence; multiphoton excitation; red/near-infrared
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Funding
- National Natural Science Foundation of China [51602288, U1604263, 11804307]
- Key Science and Technology Project of Henan Province [171100210600]
- Chemical Dynamics Research Center [21688102]
- Strategic Priority Research Program of the Chinese Academy of Sciences [XDB17000000]
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Red/near-infrared (NIR) emissive carbon nanodots (CNDs) with photoluminescence (PL) quantum yield (QY) of 57% are prepared via an in situ solvent-free carbonization strategy for the first time. 1-Photon and 2-photon cellular imaging is demonstrated by using the CNDs as red/NIR fluorescence agent due to the high PL QY and low biotoxicity. Further study shows that the red/NIR CNDs exhibit multiphoton excited (MPE) upconversion fluorescence under excitation of 800-2000 nm, which involves three NIR windows (NIR-I, 650-950 nm; NIR-II, 1100-1350; NIR-III, 1600-1870 nm). 2-Photon, 3-photon, and 4-photon excited fluorescence of the CNDs under excitation of different wavelengths is achieved. This study develops an in situ solvent-free carbonization method for efficient red/NIR emissive CNDs with MPE upconversion fluorescence, which may push forward the application of the CNDs in bioimaging.
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