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S,N-Codoped oil-soluble fluorescent carbon dots for a high color-rendering WLED

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Abstract

Carbon dots (CDs) have attracted widespread attention in light-emitting-diode (LED) applications owing to their environmental friendliness, easy processing and unique optical properties. For the practical use of CDs in LEDs, the controllable synthesis of high performance oil-soluble carbon dots is still in urgent demand. In this study, S,N-codoped oil-soluble carbon dots (S,N-OCDs) with an average size of 3.38 nm were prepared by solvothermal reaction of acetone, dimethyl trithiocarbonate (DMTTC) and nitric acid. Characterization results reveal that both the conjugated aromatic π systems from the aldol condensation and highly active free radicals from DMTTC essentially dominate the development of these yellow-green emitting S,N-OCDs, which possess high carbonization, quantum yield (21.08%) and oil-solubility. Furthermore, a white light-emitting-diode (WLED) was fabricated through mixing the obtained S,N-OCDs and epoxy and drop-casting the mixture on the surface of gallium nitride (GaN)-based blue chips. The as-prepared WLED showed excellent color rendering properties (CCT of 5389 K, CIE coordinates of (0.33, 0.30), and CRI of 88.38).

Graphical abstract: S,N-Codoped oil-soluble fluorescent carbon dots for a high color-rendering WLED

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Article information


Submitted
03 Jan 2020
Accepted
26 Feb 2020
First published
26 Feb 2020

J. Mater. Chem. C, 2020, Advance Article
Article type
Paper

S,N-Codoped oil-soluble fluorescent carbon dots for a high color-rendering WLED

Q. Wang, Y. Gao, B. Wang, Y. Guo, U. Ahmad, Y. Wang, Y. Wang, S. Lu, H. Li and G. Zhou, J. Mater. Chem. C, 2020, Advance Article , DOI: 10.1039/D0TC00016G

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