Realization of the Photostable Intrinsic Core Emission from Carbon Dots through Surface Deoxidation by Ultraviolet Irradiation
- Minghong SunMinghong SunState Key Laboratory of Luminescence and Applications, Changchun Institute of Optics, Fine Mechanics and Physics, Chinese Academy of Sciences, Changchun 130033, ChinaUniversity of Chinese Academy of Sciences, Beijing 100049, ChinaMore by Minghong Sun
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- Chao LiangChao LiangJoint Key Laboratory of the Ministry of Education, Institute of Applied Physics and Materials Engineering, University of Macau, Taipa, Macau, ChinaMore by Chao Liang
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- Zhen TianZhen TianState Key Laboratory of Luminescence and Applications, Changchun Institute of Optics, Fine Mechanics and Physics, Chinese Academy of Sciences, Changchun 130033, ChinaUniversity of Chinese Academy of Sciences, Beijing 100049, ChinaMore by Zhen Tian
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- Elena V. UshakovaElena V. UshakovaCenter of Information Optical Technologies, ITMO University, Saint Petersburg 197101, RussiaMore by Elena V. Ushakova
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- Di LiDi LiState Key Laboratory of Luminescence and Applications, Changchun Institute of Optics, Fine Mechanics and Physics, Chinese Academy of Sciences, Changchun 130033, ChinaMore by Di Li
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- Guichuan XingGuichuan XingJoint Key Laboratory of the Ministry of Education, Institute of Applied Physics and Materials Engineering, University of Macau, Taipa, Macau, ChinaMore by Guichuan Xing
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- Songnan Qu*Songnan Qu*E-mail: [email protected]Joint Key Laboratory of the Ministry of Education, Institute of Applied Physics and Materials Engineering, University of Macau, Taipa, Macau, ChinaMore by Songnan Qu
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- Andrey L. RogachAndrey L. RogachCenter of Information Optical Technologies, ITMO University, Saint Petersburg 197101, RussiaDepartment of Materials Science and Engineering, City University of Hong Kong, 83 Tat Chee Avenue, Kowloon, Hong Kong, ChinaMore by Andrey L. Rogach
Abstract

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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