期刊
JOURNAL OF LUMINESCENCE
卷 211, 期 -, 页码 298-304出版社
ELSEVIER SCIENCE BV
DOI: 10.1016/j.jlumin.2019.03.064
关键词
Carbon dots; Biomass; Near-infrared emission; Surface state; Bioimaging
类别
资金
- Fundamental Research Funds for the Central Universities [2017QNA08]
Fluorescent carbon dots (CDs) have gained intensive interests in the recent years due to their unique optical properties and widespread applications. However, the facile synthesis of highly efficient near-infrared emitting CDs (NIR-CDs) from renewable and low-cost natural resources is still a challenge to be addressed for their further applications, particularly in the bioimaging fields. Herein, NIR-CDs with a high quantum yield of 31% in water were synthesized by heating a formamide solution of pulp-free lemon juice. The as-obtained NIR-CDs possess an average size of 5.7 nm and a nitrogen content of approximately 20%, and exhibit an excitation-independent photoluminescence (PL) emission at 704 nm. Further studies suggest that the intense near-infrared emission of NIR-CDs is originated from their surface states, and that the energy gaps of these surface states are modulated by both the particle size and the nitrogen-doping amount. In addition, characterized with good photostability and low cytotoxicity, these NIR-CDs can be used as an excellent fluorescent probe for bioimaging both in vitro and in vivo.
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