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Tricolor White-Light-Emitting Carbon Dots with Multiple-Cores@Shell Structure for WLED Application
Tianyi Zhang1, Feifei Zhao1, Li Li1
1College of Chemistry , Northeast Normal University , Changchun 130024 , P. R. China.
ACS Applied Materials & Interfaces
|May 25, 2018
Summary
Novel nitrogen-doped carbon dots (AC-CDs) exhibit multicolor and white-light emission. These advanced carbon dots show potential for applications in white-light-emitting diodes due to their stability and tunable properties.
Area of Science:
- Materials Science
- Nanotechnology
- Photochemistry
Background:
- Carbon dots (CDs) are rapidly developing nanomaterials with excellent optical properties and diverse applications.
- Achieving long-wavelength multicolor emission from CDs remains a significant challenge for practical applications.
- Nitrogen-doped CDs offer unique photoluminescent properties and enhanced functionality.
Purpose of the Study:
- To construct novel nitrogen-doped multiple-core@shell-structured carbon dots (AC-CDs) with tricolor emissions (red, green, blue).
- To explore the origin of different fluorescence emissions based on the coordination ability of surface groups.
- To investigate the concentration dependence of fluorescent properties and achieve white-light emission.
Main Methods:
- One-pot hydrothermal synthesis using 5-amino-1,10-phenanthroline and citric acid as reactants.
- Monitoring the growth process of AC-CDs by varying reaction time.
- Characterization of fluorescence emission properties, including quantum yield (QY) and Commission Internationale de l'Elcairage (CIE) coordinates.
Main Results:
- Successfully synthesized nitrogen-doped multiple-core@shell-structured AC-CDs exhibiting red, green, and blue emissions.
- Achieved a high red emission quantum yield of 67% at 630 nm by adjusting AC-CD concentration.
- Generated pure white-light emission (CIE: 0.33, 0.33) from single AC-CDs with a QY of 29% through excitation and concentration regulation.
Conclusions:
- The surface groups' coordination ability is crucial for the multicolor emission of AC-CDs.
- AC-CDs demonstrate concentration-dependent fluorescence properties and tunable emission colors.
- White-emitting AC-CDs show promise as phosphors for fabricating stable and efficient white-light-emitting diodes.
Keywords:
carbon dotshigh quantum yieldsmultiple-core@shell structurepure white-light emissiontricolor emissionMore Related Videos
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