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. 2021 Feb 1;11(2):364. doi: 10.3390/nano11020364

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© 2021 by the authors.

Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (http://creativecommons.org/licenses/by/4.0/).

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Examples of the multicolor electroluminescent CDs-based LEDs. (a) The device structure comprising ITO/PEDOT:PSS (anode), MCBF-CQDs (multicolor bandgap fluorescent carbon quantum dots as an active emission layer), TPBi (ETL), and Ca/Al (cathode). The normalized PL spectra and the corresponding EL spectra of (b) blue CDs, (c) green CDs, (d) yellow CDs, (e) orange CDs, and (f) red CDs based thin films. The photographs in the insets of (b–f) display the emission from blue, green, yellow, orange, and red emission of the respective monochrome LEDs. Reprinted with permission from reference [52], Copyright Wiley-VCH, 2017.