Light of carbon: Recent advancements of carbon dots for LEDs

Ji, Chunyu; Xu, Wei; Han, Qiurui; Zhao, Tianshu; Deng, Jie; Peng, Zhili

doi:10.1016/j.nanoen.2023.108623

Cited by 73 publications

(18 citation statements)

References 218 publications

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“…S15 (ESI†) that no new light energy groups appear, that is, no chemical reaction occurs to produce new substances, thus the EL spectrum of the device is a composite spectrum. 58,59 When the doping ratio of CBP&CDs is 1 : 8, the fabricated CDs-LED with CIE coordinates of (0.30, 0.47) is obtained (Fig. 4(b)), corresponding to green light emission.…”

Section: Resultsmentioning

confidence: 99%

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Optimizing charge balance in carbon dot-based LEDs for enhanced performance

Yu,

Liu,

Chen

et al. 2023

J. Mater. Chem. C

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Section: Resultsmentioning

confidence: 99%

“…S10, ESI †), because a larger current density difference results in excessive leakage current and finally the formation of excitons is suppressed. 18,58 Specifically, the device with the ratio of 1 : 8 shows a well-matched electron-hole balance. Fig.…”

Section: Resultsmentioning

confidence: 99%

Optimizing charge balance in carbon dot-based LEDs for enhanced performance

Yu,

Liu,

Chen

et al. 2023

J. Mater. Chem. C

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“…Carbon dots (CDs) are a new carbon-based functional nanomaterial − and have been widely used in fields such as fluorescence detection, biological imaging, − photocatalysis, , and preparation of light-emitting diodes (LEDs) − due to their excellent photoluminescence intensities, low toxicities, biocompatibilities, and electroluminescence capabilities. The properties of the CDs depend to a large extent on the choice of precursors, synthetic methods, and reaction conditions.…”

Section: Introductionmentioning

confidence: 99%

Application of Multicolor Fluorescent Carbon Dots Based on Tea Polyphenols in a White Light-Emitting Diode and Room-Temperature Phosphorescence

Chen,

Liu,

Sun

et al. 2024

ACS Appl. Mater. Interfaces

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Carbon dots (CDs) are new carbon nanomaterials, among which those prepared from biomass are popular due to their excellent optical properties and environmental friendliness. As representative natural phenolic compounds, tea polyphenols are ideal precursors with fluorescent aromatic rings and phenolic hydroxyl structures. Usually, polyphenolic precursors can only be used to produce blue or green fluorescent CDs, and fluorescence in long wavelength domains, such as orange or red, cannot be achieved. Herein, the high reactivity of the phenolic hydroxyl groups in tea polyphenols with o-phthalaldehyde was exploited to modulate the pH during the carbonation process, which led to redshifts of the fluorescence wavelengths. Different pH values during the reaction caused the precursors to take different reaction paths and form fluorescent groups exhibiting different conjugated structures, resulting in carbon dots providing different fluorescent colors. Finally, by utilizing the in situ hydrolysis of ethyl orthosilicate, the tea polyphenol-based carbon dots were embedded into a silica matrix, inducing phosphorescence of the carbon dots. This study provides a new approach for green preparation and application of natural polyphenolic CDs.

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“…White light-emitting diodes (WLEDs) have drawn extensive attention thanks to their excellent luminous properties and superior energy efficiency . WLEDs are mainly constructed via phosphor-conversion-based technology, in which the exciting light source blue/UV LED chips were paired with phosphors of tunable emissions. , Currently, the markets are dominated by rare earth material-derived phosphors; however, they face various practical challenges such as high cost, complicated processing, and, most importantly, the non-renewable nature of rare earth resources.…”

Section: Introductionmentioning

confidence: 99%

Multicolor Carbon Dots for Warm White Light-Emitting Diodes with a High Color Rendering Index of 93.2

Han,

Xu,

Deng

et al. 2023

ACS Appl. Nano Mater.

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Multicolor carbon dots (CDs) with compatible physical and chemical properties have tremendous potential applications in full-color display and photoelectric devices. In this work, red, green, and blue-emissive CDs (R-, G-, and B-CDs) were synthesized from o-, m-, and p-phenylenediamine under identical reactions for the first time. Mechanism exploration has shown that the photoluminescence of G-and B-CDs was dominantly core-state emissions while that of R-CDs was also heavily influenced by surface-state emissions. Superior WLEDs were fabricated exploiting the three CDs as compositing white phosphors, emitting warm white light with a correlated color temperature of 3248 K, CIE coordinates of (0.41, 0.38), and a high color rendering index value of 93.2, surpassing most phenylenediamine-derived CDs WLEDs. Most importantly, the WLEDs also demonstrated high stabilities under different working conditions and environments, highlighting their practicality.

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Light of carbon: Recent advancements of carbon dots for LEDs

Cited by 73 publications

References 218 publications

Optimizing charge balance in carbon dot-based LEDs for enhanced performance

Optimizing charge balance in carbon dot-based LEDs for enhanced performance

Application of Multicolor Fluorescent Carbon Dots Based on Tea Polyphenols in a White Light-Emitting Diode and Room-Temperature Phosphorescence

Multicolor Carbon Dots for Warm White Light-Emitting Diodes with a High Color Rendering Index of 93.2

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