Open AccessEfficient Red/Near‐Infrared‐Emissive Carbon Nanodots with Multiphoton Excited Upconversion Fluorescence
Author(s) -
Liu KaiKai,
Song ShiYu,
Sui LaiZhi,
Wu SiXuan,
Jing PengTao,
Wang RuoQiu,
Li QingYi,
Wu GuoRong,
Zhang ZhenZhong,
Yuan KaiJun,
Shan ChongXin
Publication year - 2019
Publication title -
advanced science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 5.388
H-Index - 100
ISSN - 2198-3844
DOI - 10.1002/advs.201900766
Subject(s) - photon upconversion , fluorescence , quantum yield , excited state , materials science , photoluminescence , nanodot , near infrared spectroscopy , carbonization , photochemistry , carbon fibers , optoelectronics , analytical chemistry (journal) , luminescence , chemistry , optics , scanning electron microscope , physics , chromatography , composite number , nuclear physics , composite material
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.