Solvatochromism of bright carbon dots with tunable long-wavelength emission from green to red and their application as solid-state materials for warm WLEDs

Lin, Sai; Lin, Chun Che; He, Meiling; Yuan, Rongrong; Zhang, Yijun; Zhou, Yan; Xiang, Weidong

doi:10.1039/c7ra07736j

Cited by 79 publications

(46 citation statements)

References 35 publications

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“…1 Currently, CDs have been applied in bioimaging, 2 biosensors, 3 photocatalysts, 4 photothermal therapy, 5 shape memory polymers, 6 and optoelectronic devices. 7 One of the conventional methods for synthesizing CDs is the hydrothermal method due to its low price, ecofriendliness, and ease of process. 8 Besides, the hydrothermal method also enables the control of particle size, composition, purity, and energy consumption.…”

Section: Introductionmentioning

confidence: 99%

Simultaneous ultraviolet and first near-infrared window absorption of luminescent carbon dots/PVA composite film

et al. 2019

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Section: Introductionmentioning

confidence: 99%

Simultaneous ultraviolet and first near-infrared window absorption of luminescent carbon dots/PVA composite film

et al. 2019

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“…The relatively weaker band located around 1570–1750 cm − 1 is assigned to carbonyl bonds (C=O) and aromatic C=C. Besides, the absorption peak centered at ~ 1411 and ~ 1239 cm − 1 corresponds to the stretching mode of C–N and C=N, respectively [32, 33]. The existence of C–O–C bonds leads to the absorption band from 990 to 1170 cm − 1 [34].…”

Section: Resultsmentioning

confidence: 99%

Surface States Induced Photoluminescence Enhancement of Nitrogen-Doped Carbon Dots Via Post-Treatments

et al. 2019

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The tunable photoluminescence (PL) of nitrogen-doped carbon dots (NCDs) has attracted much attention in recent years while the specific mechanism is still in dispute. Herein, NCDs with yellow emission were successfully synthesized via a facile hydrothermal approach. Three kinds of post-treatment routes were investigated to verify the influence of surface states on the PL emission of NCDs including solvent-dependent, reduced-reaction and metal-enhanced effect. The interaction mechanism was studied by absorption spectrum, structural characterizations, steady-state and time-resolved spectroscopy. When dispersed in different solvents, the as-prepared NCDs show tunable emission and PL enhancement attributed to hydrogen bonding between solvents and NCDs. Besides, the addition of NaBH 4 can induce the reduction of the C=O bonds existing in original NCDs to C–O bonds and thus result in the enhancement of the intrinsic ( n – π *) emission. Moreover, metal-enhanced fluorescence of NCDs can also be observed when adding Ag + into initial NCD solution, which might be ascribed to aggregation-induced emission enhancement. These results for post-treated NCDs demonstrate that surface functional groups are responsible for PL emission and provide new possibilities like multi-image sensing and lighting application. Electronic supplementary material The online version of this article (10.1186/s11671-019-3008-9) contains supplementary material, which is available to authorized users.

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“…Xiang and co‐workers reported long‐wavelength emitting CDs via a solvothermal route using o‐phenylenediamine/p‐phenylenediamine as a starting material and N,N‐dimethylformamide (DMF) as the solvent. To solve the issue of fluorescence quenching of CDs in solid state, polyvinyl butyral (PVB) is chosen as the solid‐state matrix of the CDs, posing a promising application as red color converter in solid‐state warm WLEDs . Lei and co‐workers successfully synthesized homogeneous organosilane‐functionalized red‐fluorescence CDs with size distribution of nearly 3 nm, excellent water solubility, superior optical properties, and the feature of solid‐state red fluorescence.…”

Section: Applications Of Rcdsmentioning

confidence: 99%

Synthesis and Applications of Red‐Emissive Carbon Dots

Wang

Zhu

Wang

2019

The Chemical Record

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Carbon dots (CDs), a new class of fluorescent carbon nanoparticles (less than 10 nm in size), have been widely applied in various fields, including sensors, bioimaging, catalysis, lightemitting devices (LEDs), and photoelectronic devices, owing to their unique properties such as low toxicity, bio-compatibility, high photostability, easy surface modification, and up-conversion fluorescence, over the past decades. Recently, multiple-color-emissive CDs, especially redemissive CDs (RCDs), have drawn much attention owing to their unique advantages, like the ability to penetrate the animal bodies without the disturbance of strong tissue autofluorescence, multiple-color fluorescence displaying or sensing, and the capacity to be one essential component to obtain white LED (WLED). In this review, we focused on the progress of recently-emerging RCDs in the past five years, including their synthetic methods (hydrothermal, solvothermal, reflux condensation and microwave techniques), influencing factors (precursors, solvents, elements doping, surface chemistry) and various applications (bioimaging, sensor, photocatalysis and WLEDs), with a perspective on the future advancements.

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Solvatochromism of bright carbon dots with tunable long-wavelength emission from green to red and their application as solid-state materials for warm WLEDs

Abstract: Herein, we present a facile approach to produce long-wavelength emitting carbon dots (CDs) without separation.

Cited by 79 publications

References 35 publications

Simultaneous ultraviolet and first near-infrared window absorption of luminescent carbon dots/PVA composite film

Simultaneous ultraviolet and first near-infrared window absorption of luminescent carbon dots/PVA composite film

Surface States Induced Photoluminescence Enhancement of Nitrogen-Doped Carbon Dots Via Post-Treatments

Synthesis and Applications of Red‐Emissive Carbon Dots

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