Regulation of multi-color fluorescence of carbonized polymer dots by multiple contributions of effective conjugate size, surface state, and molecular fluorescence

Wan, Jiafeng; Jiang, Ya; Xu, Shiqing; Li, Jing; Yu, Miao; Zhang, Kai; Su, Zhiqiang; Zhang, Xin

doi:10.1039/d2tb01330d

Cited by 14 publications

(14 citation statements)

References 36 publications

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“…In this study, the emissive color of MCDs red-shifts as the particle size increases, accompanied by a good linear relationship over emissive wavelength and size (Figure S1). It can be illustrated by the quantum size effect that increasing particle size is in good agreement with decreasing band gap. , Accordingly, the band gap energies (Figure S2) were calculated by α hv n = A ( hv – E g ), where α and hv represent the absorption coefficient and incident light energy, respectively. , From g-CDs to o-CDs, the energy gap decreases from 2.4 to 2.09 eV, as the particle size increases from 4.73 to 6.78 nm (Figure a). The increasing particle size leads to the decrease of the lowest unoccupied molecular orbit (LUMO) energy level; then, the band gap decreases.…”

Section: Resultsmentioning

confidence: 85%

“…6,13 Accordingly, the band gap energies (Figure S2) were calculated by αhv n = A(hv − E g ), where α and hv represent the absorption coefficient and incident light energy, respectively. 12,42 From g-CDs to o-CDs, the energy gap decreases from 2.4 to 2.09 eV, as the particle size increases from 4.73 to 6.78 nm (Figure 3a). The increasing particle size leads to the decrease of the lowest unoccupied molecular orbit (LUMO) energy level; then, the band gap decreases.…”

Section: Optical Mechanism and Formation Of Mcdsmentioning

confidence: 99%

“…Meanwhile, column chromatography usually needs much organic solvent, which is not friendly to the environment and health. Therefore, it is urgent to develop efficient and convenient methods to obtain MCDs. ,− Recently, a facile one-step synthesis of MCDs has become a research hotspot . MCDs can be harvested just by choosing different precursors , and controlling reaction conditions such as the ratio of reactants, , solvents, temperature, and pH .…”

Section: Introductionmentioning

confidence: 99%

“…Nowadays, most researchers agree that graphitization and surface functionalization are the two important factors affecting the emissive color of CDs. − For example, Lu et al employed glucose to synthesize MCDs by controlling the particle size and degree of graphitization. Li et al prepared MCDs by controlling the surface states with different ratios of nitrogen- and oxygen-related species.…”

Section: Introductionmentioning

confidence: 99%

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Reaction Time-Controlled Synthesis of Multicolor Carbon Dots for White Light-Emitting Diodes

Shen

Zheng

Lin

et al. 2023

ACS Appl. Nano Mater.

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Multicolor carbon dots (MCDs) have been receiving great attention because of their controllable fluorescence, which can be applied as novel optical sources. However, the preparation of MCDs is complex and the corresponding mechanism is still unclear. Here, using o-phenylenediamine and l-tryptophan as precursors, a facile one-step synthesis of MCDs (green, yellow, orange) is proposed through a reaction time engineering strategy. The structural and optical analyses combined with theoretical calculations are performed to disclose the synthetic and fluorescence mechanisms of MCDs. The result shows that increasing the reaction time improves the graphitization degree and surface states, making the emission wavelength red-shifted. In addition, the white-emissive CDs (w-CDs) are easily obtained using the same precursors. The structure and optical properties of w-CDs further confirm the importance of the graphitization degree and surface states in controlling the emissive color of CDs. Based on the optical properties, the MCDs are explored for water detection in organic solvents and multiple anticounterfeiting/information encryption. Moreover, multicolor light-emitting devices (LEDs) are successfully fabricated based on the MCD/PVP composition coated with 365 nm chips. In particular, high-performance white light-emitting devices (WLEDs) directly from w-CDs are obtained with Commission on Illumination (CIE) coordinates of (0.32 and 0.35) and a CRI of 87.2, similar to the standard w-LEDs.

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Section: Resultsmentioning

confidence: 85%

Section: Optical Mechanism and Formation Of Mcdsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Reaction Time-Controlled Synthesis of Multicolor Carbon Dots for White Light-Emitting Diodes

Shen

Zheng

Lin

et al. 2023

ACS Appl. Nano Mater.

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“…using DMF as the reaction solvent showed a significant red shift as the reaction temperature or the reaction time increased. [ 34 ] From the perspective of two main luminescence mechanisms, reaction temperature and reaction time have an important impact on the formation of molecular states. As the reaction temperature increases, the contribution of molecular states to luminescence decreases.…”

Section: Structure and Performance Of Cpdsmentioning

confidence: 99%

The Classification of Carbon Dots and the Relationship between Synthesis Methods and Properties

2023

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Comprehensive Summary The carbon dots (CDs), as emerging carbon based nanomaterials, are a kind of fluorescent materials with wide application prospects. Highly luminous CDs can simply be synthesized by a wide variety of easily accessible precursors. CDs have excellent optical properties, high biocompatibility and low toxicity, which makes them be used in the fields of optics, biology, energy, and so on. In this review, the classification, nomenclature, photoluminescence mechanism and property regulation of CDs are reviewed. Finally, the future research interests and potential challenges of CDs are prospected.

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Deep‐Red to Near‐Infrared Carbon Dots in Biosensing and Bio‐medical Applications

Huang

Chen

et al. 2023

Chin. J. Chem.

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Comprehensive SummaryWith the rapid development in the field of biomedical diagnosis and treatment, carbon dots (CDs) with favorable photostability, biocompatibility and high quantum yields for deep‐red to near‐infrared emission have attracted the attention of a majority of researchers. By enlarging the sp2 domain in the core of CDs, doping them with heteroatoms like nitrogen and sulfur, applying hydrothermal, electrochemical, or microwave‐assisted techniques, CDs can be made with the aforementioned photoemission capabilities. In view of these excellent properties, CDs are flourishing in biosensing and biomedical applications, so that a thorough description and discussion of this topic is beneficial to capture the up‐to‐date progress of CDs in this field, providing suggestions and considerations for readers.

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Regulation of multi-color fluorescence of carbonized polymer dots by multiple contributions of effective conjugate size, surface state, and molecular fluorescence

Abstract: Fluorescent carbon dots (CDs)-based nanomaterials exhibited promising potential in the fields of biomedicine, bioanalysis, and biosensors. In this work, multi-colored fluorescent carbonized polymer dots (CPDs) ranging from blue to red...

Cited by 14 publications

References 36 publications

Reaction Time-Controlled Synthesis of Multicolor Carbon Dots for White Light-Emitting Diodes

Reaction Time-Controlled Synthesis of Multicolor Carbon Dots for White Light-Emitting Diodes

The Classification of Carbon Dots and the Relationship between Synthesis Methods and Properties

Deep‐Red to Near‐Infrared Carbon Dots in Biosensing and Bio‐medical Applications

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