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Monofactorial control of carbon dot emission in solvent-free synthesis for wide-gamut light emitting diodes.

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Title: Monofactorial control of carbon dot emission in solvent-free synthesis for wide-gamut light emitting diodes.
Authors: Wang, Xin1,2 (AUTHOR), Yao, Boxuan1 (AUTHOR), Song, Wenjing1 (AUTHOR), Zhang, Junnan1 (AUTHOR), Zhou, Mingyang1 (AUTHOR), Hu, Wei1 (AUTHOR), Zhao, Lei3 (AUTHOR), Liu, Jian4 (AUTHOR), Yang, Shenghong1 (AUTHOR) yangsh@qlu.edu.cn
Source: Chemical Engineering Journal. Sep2025, Vol. 520, pN.PAG-N.PAG. 1p.
Subjects: Carbon nanodots, Light emitting diodes, Cell imaging, Chemical synthesis, Quantum efficiency, Fluorophores
Abstract: The flexible regulation of carbon dots (CDs) emission wavelengths through controlling single variable remains a significant challenge. In this study, we present a novel single-factor tuning preparation strategy for synthesizing full-color fluorescent CDs in an open, rapid and solvent-free reaction system. Tunable purple-to-red emission CDs were prepared within 5 min solely by adjusting o -phenylenediamine/dicarboxylic acid mass ratios. The production yields and quantum yield of CDs can reach up to 70.5 % and 34.1 %, respectively. Changing the reactants ratio affects the dehydration and carbonization. This led to an orderly red-shift in CDs emission wavelength. Detailed characterizations and theoretical calculations reveal key insight. The transformation in optical features correlates with a gradient increase in particle size. It also correlates with an increase in graphitic nitrogen and sp2-conjugated domains. These CDs exhibit excellent biocompatibility and stable fluorescence characteristics, making them successful for bioimaging applications in live cells and zebrafish embryos. Furthermore, leveraging the simplicity and solvent-free nature of the synthesis, full-color and high color rendering index (CRI > 83) white light LEDs with tunable color temperature were successfully fabricated, demonstrating substantial application potential for commercial lighting. The proposed single-factor solvent-free synthesis strategy may further improve the industrialization potential of CDs-based optical materials. [Display omitted] • A novel single-factor tuning strategy to synthesize full-color fluorescent CDs. • Full-color fluorescent CDs were prepared in rapid and solvent-free reaction system. • The single-factor tuning strategy makes the luminescence mechanism clearer. • Full-color fluorescent CDs has successfully used in bioimaging and lighting field. [ABSTRACT FROM AUTHOR]
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Database: Engineering Source
Description
Abstract:The flexible regulation of carbon dots (CDs) emission wavelengths through controlling single variable remains a significant challenge. In this study, we present a novel single-factor tuning preparation strategy for synthesizing full-color fluorescent CDs in an open, rapid and solvent-free reaction system. Tunable purple-to-red emission CDs were prepared within 5 min solely by adjusting o -phenylenediamine/dicarboxylic acid mass ratios. The production yields and quantum yield of CDs can reach up to 70.5 % and 34.1 %, respectively. Changing the reactants ratio affects the dehydration and carbonization. This led to an orderly red-shift in CDs emission wavelength. Detailed characterizations and theoretical calculations reveal key insight. The transformation in optical features correlates with a gradient increase in particle size. It also correlates with an increase in graphitic nitrogen and sp2-conjugated domains. These CDs exhibit excellent biocompatibility and stable fluorescence characteristics, making them successful for bioimaging applications in live cells and zebrafish embryos. Furthermore, leveraging the simplicity and solvent-free nature of the synthesis, full-color and high color rendering index (CRI > 83) white light LEDs with tunable color temperature were successfully fabricated, demonstrating substantial application potential for commercial lighting. The proposed single-factor solvent-free synthesis strategy may further improve the industrialization potential of CDs-based optical materials. [Display omitted] • A novel single-factor tuning strategy to synthesize full-color fluorescent CDs. • Full-color fluorescent CDs were prepared in rapid and solvent-free reaction system. • The single-factor tuning strategy makes the luminescence mechanism clearer. • Full-color fluorescent CDs has successfully used in bioimaging and lighting field. [ABSTRACT FROM AUTHOR]
ISSN:13858947
DOI:10.1016/j.cej.2025.165821