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Open AccessCommunication
Materials 2017, 10(2), 165; doi:10.3390/ma10020165

Multicolour Emission States from Charge Transfer between Carbon Dots and Surface Molecules

1
School of Material Science and Engineering, North University of China, Taiyuan 030051, China
2
State Key Laboratory of New Ceramics and Fine Processing, Tsinghua University, Beijing 100084, China
*
Authors to whom correspondence should be addressed.
Academic Editor: Lioz Etgar
Received: 13 December 2016 / Revised: 19 January 2017 / Accepted: 26 January 2017 / Published: 11 February 2017
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Abstract

The emissive states of carbon dots have been tuned by controlling the charge transfer process. The carbon dots couple with molecules, which are made of a benzene ring and different heteroatom substituents, through amino-carboxylic bonds that are generally identified as charge transfer promoters at the interface. New ways of radiative recombination are created due to the transfer of photo-excited electrons from carbon dots to the lowest unoccupied molecular orbital (LUMO) of the grafted molecules. By variation of the molecular orbital energy levels via heteroatom substituents in the benzene ring, the different optical properties and emission colors of the carbon dots were presented. This work opens up new opportunities for the application of carbon dots since different heteroatom substituents could lead to many possibilities for conjugation with drugs and biomolecules. View Full-Text
Keywords: carbon dots; band gap; surface states; charge transfer; photoluminescence; heteroatom groups carbon dots; band gap; surface states; charge transfer; photoluminescence; heteroatom groups
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Hu, S.; Wang, Y.; Zhang, W.; Chang, Q.; Yang, J. Multicolour Emission States from Charge Transfer between Carbon Dots and Surface Molecules. Materials 2017, 10, 165.

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