Ethanol-derived white emissive carbon dots: the formation process investigation and multi-color/white LEDs preparation

• Published in: Nano research Vol. 15; no. 2; pp. 942 - 949
• Main Authors: Wang, Boyang, Song, Haoqiang, Tang, Zhiyong, Yang, Bai, Lu, Siyu
• Format: Journal Article
• Language: English
• Published: Beijing Tsinghua University Press 01-02-2022; Springer Nature B.V
• Subjects: Atomic/Molecular Structure and Spectra; Biomedicine; Biotechnology; Byproducts; Carbon; Carbon dots; Carbon sources; Carbonization; Chemistry and Materials Science; Color; Column chromatography; Condensed Matter Physics; Doppler effect; Emission; Emissions; Ethanol; Graphitic structure; Light emitting diodes; Materials Science; Nanotechnology; Organic chemistry; Oxidation; Photoelectric effect; Photoelectric properties; Photoelectricity; Polymers; Red shift; Research Article; Synthesis; Wavelengths; White light; carbon dots; phosphors; multi-color-emissive; cross-linking; fluorescence mechanism
• ISSN: 1998-0124; 1998-0000
• DOI: 10.1007/s12274-021-3579-5

Carbon dots (CDs) have attracted much attention due to their excellent photoelectric properties and potential applications. Although previous studies have shown that almost all organic molecules can be converted into CDs via chemical carbonization, the mechanism of the conversion process remains unclear. The hydrothermal/solvothermal method commonly used to prepare CDs is complicated and leads to the generation of many by-product CDs with similar structures. Considering that the purification of the synthesized by-products is difficult, the process of CDs formation cannot be readily analyzed and understood. Herein, we use ethanol as a carbon source to synthesize white-emitting CDs (W-CDs). Column chromatography separation shows that the synthesized W-CDs are composed of blue-, cyan-, and yellow-emitting CDs that fluoresce at wavelengths corresponding to the three emission centers of W-CDs. Although the samples have similar graphitic structure, they exhibit different surface states due to variations in the degree of oxidation and carbonization. Therefore, the red-shift in their emission peaks is attributed to an increased degree of carbonization in their polymer structure. Theoretical calculations verify the experimental results, and the prepared CDs are successfully used to develop multi-color and white light-emitting diodes (LEDs).