Synthesis of Carbon Dots with Multiple Color Emission by Controlled Graphitization and Surface Functionalization

Advanced Materials - Tập 30 Số 1 - 2018
Xiang Shui Miao1,2,3, Dan Qu1, Dongxue Yang1, Bing Nie4,1, Yikang Zhao4,1, Hongyou Fan5, Zaicheng Sun1
1Beijing Key Lab for Green Catalysis and Separation, Department of Chemistry and Chemical Engineering, College of Environmental and Energy Engineering, Beijing University of Technology, 100 Pingleyuan, Beijing, 100124 P. R. China
2Graduate School, University of Chinese Academy of Sciences, Beijing 100049, P. R. China
3State Key Laboratory of Luminescence and Applications, Changchun Institute of Optics, Fine Mechanics and Physics, Changchun, 130033 Jilin, P. R. China
4Beijing Guangqumen High School, Dongcheng District, Beijing, 100000 P. R. China
5Sandia National Labs, 1001 University Blvd., Albuquerque, NM, 87106 USA

Tóm tắt

AbstractMultiple‐color‐emissive carbon dots (CDots) have potential applications in various fields such as bioimaging, light‐emitting devices, and photocatalysis. The majority of the current CDots to date exhibit excitation‐wavelength‐dependent emissions with their maximum emission limited at the blue‐light region. Here, a synthesis of multiple‐color‐emission CDots by controlled graphitization and surface function is reported. The CDots are synthesized through controlled thermal pyrolysis of citric acid and urea. By regulating the thermal‐pyrolysis temperature and ratio of reactants, the maximum emission of the resulting CDots gradually shifts from blue to red light, covering the entire light spectrum. Specifically, the emission position of the CDots can be tuned from 430 to 630 nm through controlling the extent of graphitization and the amount of surface functional groups, COOH. The relative photoluminescence quantum yields of the CDots with blue, green, and red emission reach up to 52.6%, 35.1%, and 12.9%, respectively. Furthermore, it is demonstrated that the CDots can be uniformly dispersed into epoxy resins and be fabricated as transparent CDots/epoxy composites for multiple‐color‐ and white‐light‐emitting devices. This research opens a door for developing low‐cost CDots as alternative phosphors for light‐emitting devices.

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Advanced Materials

Tập 30 Số 1

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