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Research Article

Multicolor carbon dots with concentration-tunable fluorescence and solvent-affected aggregation states for white light-emitting diodes

Fanyong Yan1( ), Yingxia Jiang1, Xiaodong Sun1, Junfu Wei1( ), Liang Chen2, Yuyang Zhang1
State Key Laboratory of Separation Membranes and Membrane Processes, School of Chemistry and Chemical Engineering, Tiangong University, Tianjin 300387, China
Graduate School of Life Science, Hokkaido University, Sapporo 0010024, Japan
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Graphical Abstract

Abstract

Multicolor emissive carbon dots (M-CDs) have tremendous potential applications in manifold fields of bioimaging, biomedicine and light-emitting devices. Until now, it is still difficult to produce fluorescence tunable CDs with high quantum yield across the entire visible spectra. In this work, a type of M-CDs with concentration-tunable fluorescence and solvent-affected aggregation states was synthesized by solvothermal treatment of citric acid (CA) and 1-(2-pyridylazo)-2-naphthol (PAN) and the formation mechanism was monitored by different reaction time and raw material ratio. The fluorescence spectra of M-CDs in organic solvents can range from 350 to 750 nm by adjusting the concentration. M-CDs possess different aggregation states in water and organic solvents, accompanied by different fluorescence emission, which is attributed to the different surface states of various component CDs in M-CDs. Moreover, the obtained products can be uniformly dispersed into polymethylmethacrylate (PMMA) solutions as well as epoxy resins to fabricate transparent CDs/PMMA films and CDs/epoxy composites, which can effectively prevent the aggregation and produce multicolor and white light-emitting diodes (WLED). In addition, the prepared WLED with Commission Internationale de L'Eclairage (CIE) of (0.29, 0.31) by using M-CDs/epoxy resin as packages, demonstrating the M-CDs exhibit potential applications for light-emitting devices.

Keywords

carbon dotsformation mechanismconcentration-tunable fluorescencesolvent-affected aggregation stateslight-emitting devices

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Nano Research
Volume 13 Issue 1,
January 2020
Pages 52-60
DOI: 10.1007/s12274-019-2569-3
Cite this article:
Yan F, Jiang Y, Sun X, et al. Multicolor carbon dots with concentration-tunable fluorescence and solvent-affected aggregation states for white light-emitting diodes. Nano Research, 2020, 13(1): 52-60. https://doi.org/10.1007/s12274-019-2569-3
Topics:
CarbonFluorescenceOrganic solvents

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Received: 15 September 2019
Revised: 10 November 2019
Accepted: 12 November 2019
Published: 04 December 2019
© Tsinghua University Press and Springer-Verlag GmbH Germany, part of Springer Nature 2019
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