期刊
CARBON
卷 181, 期 -, 页码 9-15出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.carbon.2021.05.023
关键词
Room-temperature phosphorescence; Fluorine-nitrogen co-doped carbon dots; Information encryption
资金
- National Key R&D Program of China [2016YFA0202302]
- State Key Program of National Natural Science Foundation of China [51633007]
- National Natural Science Foundation of China [51773147, 51973151]
The study found that fluorine-nitrogen co-doped carbon dots exhibit high RTP lifetime and quantum yield, mainly originating from specific electron transitions. Additionally, hydrogen bonding between carbon dots and polyvinyl alcohol matrix, as well as semi-ionic C-F bonds, can enhance the efficiency of RTP.
The spin-forbidden nature of triplet exciton transitions is a limitation for achieving a carbon dots-based material with room-temperature phosphorescence (RTP). Here, fluorine-nitrogen co-doped carbon dots (FNCDs), prepared using the solvothermal method and further gas-phase fluorination from fructose and diethylenetriamine (DETA), were found to exhibit RTP lifetime and quantum yield of 1.14 s and 8.3%. By comparing the structure and performance of the nitrogen-doped carbon dots (NCDs) and FNCDs, it was found that the RTP of FNCDs originates from the 7r->7r* and n->7r* electron transitions C-N/C=N, which can be attributed to the small energy gap between the singlet and triplet states. We further explored the mechanism of RTP by analyzing the hydrogen bonding between carbon dots and polyvinyl alcohol matrix. The semi-ionic C-F bonds also enhance intramolecular and intermolecular hydrogen bonding and reduce the quenching of RTP without the oxygen barrier. Furthermore, we applied the prepared aqueous FNCDs as an advanced security ink for information printing and anti-counterfeiting. (c) 2021 Elsevier Ltd. All rights reserved.
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