Journal
JOURNAL OF PHYSICAL CHEMISTRY LETTERS
Volume 10, Issue 11, Pages 3094-3100Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acs.jpclett.9b00842
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Funding
- National Natural Science Foundation of China [51602304, 61675049]
- Youth Innovation Promotion Association of CAS
- Jilin Province Science and Technology Research [20180101190JC, 20170101191JC, 20170101042JC, 20160520008JH]
- Open Project Program of the State Key Laboratory of Supramolecular Structure and Materials in Jilin University [sklssm2019014]
- Ministry of Education and Science of the Russian Federation [14.Y26.31.0028]
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It is of a primary importance to realize the intrinsic emission from the inner carbogenic cores of carbon dots (CDs). In this work, CDs with three emission centers were synthesized by a microwave-assisted method using phloroglucinol as a precursor. The emission of these three centers has been identified as originating from molecular fluorophores, surface states of CDs, and the intrinsic CD core state. The emission from molecular fluorophores and from the surface state of CDs exhibited a weak photostability and could be photobleached as a result of UV laser irradiation. The emission from the intrinsic state of the inner carbogenic core has been found to be stable against photobleaching. On the basis of this difference in photostability, we demonstrate how the surface of CDs can be deoxidized under prolonged UV irradiation, resulting in a narrow intrinsic emission with a photoluminescence quantum yield of 17%.
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