White-light emission of single carbon dots prepared by hydrothermal carbonization of poly(diallyldimethylammonium chloride): Applications to fabrication of white-light-emitting films

Madhu, Manivannan; Chen, Tzu-Heng; Tseng, Wei‐Lung

doi:10.1016/j.jcis.2019.08.049

Cited by 35 publications

(16 citation statements)

References 50 publications

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“…93 Tseng and co-workers used a multiGaussian function to fit the PL spectrum of the CDs, explaining the mechanism of the excitation-dependent and excitationindependent PL, which are related to core-state emission and surface state emissive traps, respectively. 94 Yong and co-workers demonstrated that the emission wavelength of nitrogen and sulfur co-doped carbon dots (NS-CDs) was red-shifted with increasing excitation wavelength (Fig. 5a), and the PL intensity was dependent on the pH value (Fig.…”

Section: Plmentioning

confidence: 99%

Spectroscopic studies of the optical properties of carbon dots: recent advances and future prospects

Zhao

Song

Yang

2020

Mater. Chem. Front.

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Section: Plmentioning

confidence: 99%

Spectroscopic studies of the optical properties of carbon dots: recent advances and future prospects

Zhao

Song

Yang

2020

Mater. Chem. Front.

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“…The CIE coordinates of the prepared WLED were (0.303, 0.332), but the PLQY of the material obtained drastically dropped to only 1.3%. [ 56 ] Paul et al used glycerol, p ‐phenylenediamine, and o ‐phosphoric acid as precursors to prepare CDots with white light emission through microwave irradiation. This material exhibited solvent and excitation‐dependent fluorescence characteristics.…”

Section: Recent Progress On Cdots Gqds and Related Composite Materimentioning

confidence: 99%

Rare Earth‐Free Luminescent Materials for WLEDs: Recent Progress and Perspectives

Zhang

Pan

et al. 2020

Adv Materials Technologies

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The development and application of white light‐emitting diode (WLED) lighting technology are of great significance for reducing energy consumption. Commonly used WLED devices rely on the use of rare earth luminescent materials. However, rare earth elements are nonrenewable resources, and mining and refining processes have an adverse impact on the environment. In recent years, new white light‐emitting luminescent materials that do not contain rare earth elements have been developed, such as quantum dots, fluorescent carbon dots, perovskite luminescent materials, organic luminescent materials, and metal–organic framework materials, among others, some of which are successfully applied in the development of WLEDs. Herein the latest progress in this research field is reviewed, analyzing the construction of practical WLED devices and comparing the characteristics of newly developed rare earth‐free luminescent materials. Last, the future development prospects in this field are described.

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“…GQDs are zero-dimensional graphene derivatives which have intrinsically larger Stokes shifts than common fluorescent dyes. Coupled with their biocompatibility, nontoxicity, chemical, and photostabilities, GQDs have gained tremendous attention in several application fields, especially photoluminescence (PL) sensing. − The PL properties arising from the quantum confinement and edge effects are tunable via size modification, surface functionalization, and doping with heteroatoms. − As a result, GQDs have been widely applied in chemical and biological sensing, − imaging, , drug delivery, catalysis, − LED, , optoelectronic devices, and energy related applications. , Moreover, the performances of GQDs for such applications can be effectively enhanced by doping GQDs with heteroatoms like nitrogen (N) and/or sulfur (S) leading to higher PL quantum yield (PLQY), tunable surface polarities, as well as modulated optical and electronic properties. , …”

Section: Introductionmentioning

confidence: 99%

“…11−13 The PL properties arising from the quantum confinement and edge effects are tunable via size modification, surface functionalization, and doping with heteroatoms. 14−16 As a result, GQDs have been widely applied in chemical and biological sensing, 17−20 imaging, 2,21 drug delivery, 22 catalysis, 23−25 LED, 26,27 optoelectronic devices, and energy related applications. 12,13 Moreover, the performances of GQDs for such applications can be effectively enhanced by doping GQDs with heteroatoms like nitrogen (N) and/or sulfur (S) leading to higher PL quantum yield (PLQY), tunable surface polarities, as well as modulated optical and electronic properties.…”

Section: ■ Introductionmentioning

confidence: 99%

Microplasma Band Structure Engineering in Graphene Quantum Dots for Sensitive and Wide-Range pH Sensing

Kurniawan

Anjali

Setiawan

et al. 2021

ACS Appl. Mater. Interfaces

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pH sensing using active nanomaterials is promising in many fields ranging from chemical reactions to biochemistry, biomedicine, and environmental safety especially in the nanoscale. However, it is still challenging to achieve nanotechnology-enhanced rapid, sensitive, and quantitative pH detection with stable, biocompatible, and cost-effective materials. Here, we report a rational design of nitrogen-doped graphene quantum dot (NGQD)-based pH sensors by boosting the NGQD pH sensing properties via microplasma-enabled band-structure engineering. Effectively and economically, the emission-tunable NGQDs can be synthesized from earthabundant chitosan biomass precursor by controlling the microplasma chemistry under ambient conditions. Advanced spectroscopy measurements and density functional theory (DFT) calculations reveal that functionality-tuned NGQDs with enriched −OH functional groups and stable and large Stokes shift along the variations of pH value can achieve rapid, label-free, and ionic-stable pH sensing with a wide sensing range from pH 1.8 to 13.6. The underlying mechanism of pH sensing is related to the protonation/ deprotonation of −OH group of NGQDs, leading to the maximum pH-dependent luminescence peak shift along with the bandgap broadening or narrowing. In just 1 h, a single microplasma jet can produce a stable colloidal NGQD dispersion with 10 mg/mL concentration lasting for at least 100 pH detections, and the process is scalable. This approach is generic and opens new avenues for nanographene-based materials synthesis for applications in sensing, nanocatalysis, energy generation and conversion, quantum optoelectronics, bioimaging, and drug delivery.

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White-light emission of single carbon dots prepared by hydrothermal carbonization of poly(diallyldimethylammonium chloride): Applications to fabrication of white-light-emitting films

Cited by 35 publications

References 50 publications

Spectroscopic studies of the optical properties of carbon dots: recent advances and future prospects

Spectroscopic studies of the optical properties of carbon dots: recent advances and future prospects

Rare Earth‐Free Luminescent Materials for WLEDs: Recent Progress and Perspectives

Microplasma Band Structure Engineering in Graphene Quantum Dots for Sensitive and Wide-Range pH Sensing

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