Color Conversion Light-Emitting Diodes Based on Carbon Dots: A Review
Danilo Trapani1, Roberto Macaluso1, Isodiana Crupi1
1Thin-Films Laboratory, Department of Engineering, University of Palermo, Viale delle Scienze, Bdg. 9, I-90129 Palermo, Italy.
Materials (Basel, Switzerland)
|August 12, 2022
Summary
Carbon dots (CDs) are reviewed as eco-friendly color converters for multicolor and white light-emitting diodes (LEDs). These advanced materials show potential to replace traditional phosphors, though further development is needed.
Area of Science:
- Materials Science
- Optoelectronics
- Nanotechnology
Background:
- Traditional light-emitting diodes (LEDs) often rely on phosphors for color conversion.
- Carbon dots (CDs) offer tunable luminescence and are explored as alternatives.
Purpose of the Study:
- To review state-of-the-art technologies for carbon dot (CD)-based LEDs.
- To discuss materials, characterization, and challenges in developing multicolor and white LEDs using CDs.
Main Methods:
- Review of top-down and bottom-up synthesis methods for carbon dots (CDs).
- Analysis of methods for embedding CDs onto LED surfaces for color conversion.
- Examination of characterization techniques for CD performance in LEDs.
Main Results:
- Carbon dots (CDs) enable emission at longer wavelengths than the excitation source.
- White LEDs can be achieved using UV-pumped broad-visible-emitting CDs or blue-pumped yellow-green-emitting CDs.
- Experimental results highlight CDs as promising, eco-friendly alternatives to phosphors.
Conclusions:
- Carbon dots (CDs) are highly promising for next-generation color conversion in LEDs.
- Further research and development are necessary to overcome current challenges and achieve full commercial maturity.
- CD-based LEDs offer a sustainable pathway for advanced lighting applications.
