ArticleMikrochimica acta2025
pH-modulated synthesis of multicolor carbon dots from Perilla leaves for dual-mode room-temperature fluorescence and phosphorescence applications.
Article in Mikrochimica acta, 2025. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Not yet cited in PubMed.
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Abstract
Biomass materials represent an ideal carbon source for synthesizing carbon dots (CDs) due to their abundance, elemental diversity, renewability, and low cost. This study presents a straightforward solvothermal method for synthesizing polychromatic carbon dots (MCDs) by systematically adjusting the reaction parameters using biomass-derived precursors (Perilla fruits leaves and tea polyphenols) under pH-modulated conditions (pH 2-13). The MCDs show tunable emission (395-646 nm), overcoming the traditional blue/green limitation of biomass-derived CDs. Mechanistic studies reveal that this spectral tuning arises from the synergistic control of particle size (1-5 nm) and the extent of C = C conjugated domain, facilitating long-wavelength emission. The optimized MCDs exhibit unique room-temperature dual-mode luminescence, including full-color fluorescence and long-life phosphorescence (lifetime ≈ 0.46 s), attributed to a covalent and hydrogen bond network that promotes efficient intersystem crossing. These MCDs exhibit multi-functional applications: (1) as an environmentally friendly means for white light-emitting diodes (WLED) with CIE coordinates of (0.30, 0.34), (2) for high-contrast latent fingerprint visualization, and (3) as advanced anti-counterfeiting ink with time-resolved encryption capability. This work not only establishes a green strategy for multicolor CDs derived from biomass, but also expands their potential in optical security and forensic science.
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