Photo‐and Electroluminescence from Nitrogen‐Doped and Nitrogen–Sulfur Codoped Graphene Quantum Dots

Hasan, Tanvir; González-Rodríguez, Roberto; Ryan, Conor; Faerber, Nicolas; Coffer, Jeffery L.; Naumov, Anton V.

doi:10.1002/adfm.201804337

Cited by 130 publications

(140 citation statements)

References 76 publications

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“…The prepared CQDs were diluted to four different concentrations in distilled water for absorbance measurement. QY was calculated using the following eqn :

{QY}_{S} = {QY}_{R} \times \frac{{η^{2}}_{normalS}}{{η^{2}}_{normalR}} \times \frac{{normalI}_{normalR}}{{normalI}_{normalS}} \times \frac{{normalA}_{normalS}}{{normalA}_{normalR}}

…”

Section: Resultsmentioning

confidence: 99%

“…The prepared CQDs were diluted to four different concentrations in distilled water for absorbance measurement. QY was calculated using the following eqn (4): [46,47] The QY of the orange waste peel CQDs was 11.37% at excitation wavelength 330 nm. This was due to the presence of carboxylic groups, which play a key role in the generation of CDs with high quantum yield.…”

Section: Quantum Yield Measurementsmentioning

confidence: 99%

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Facile preparation of high fluorescent carbon quantum dots from orange waste peels for nonlinear optical applications

et al. 2019

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A facile and eco‐friendly hydrothermal method was used to prepare carbon quantum dots (CQDs) using orange waste peels. The synthesized CQDs were well dispersed and the average diameter was 2.9 ± 0.5 nm. Functional group identification of the CQDs was confirmed by Fourier transform infrared spectrum analysis. Fluorescence properties of the synthesized CQDs exhibited blue emission. The fluorescence quantum yield of the CQDs was around 11.37% at an excitation wavelength of 330 nm. The higher order nonlinear optical properties were examined using a Z‐scan technique and a continuous wave laser that was operated at a wavelength of 532 nm. Results demonstrated that the synthesis of CQDs can be considered as promising for optical switching devices, bio‐scanning, and bio‐imaging for optoelectronic applications.

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“…The prepared CQDs were diluted to four different concentrations in distilled water for absorbance measurement. QY was calculated using the following eqn :

{QY}_{S} = {QY}_{R} \times \frac{{η^{2}}_{normalS}}{{η^{2}}_{normalR}} \times \frac{{normalI}_{normalR}}{{normalI}_{normalS}} \times \frac{{normalA}_{normalS}}{{normalA}_{normalR}}

…”

Section: Resultsmentioning

confidence: 99%

Section: Quantum Yield Measurementsmentioning

confidence: 99%

Facile preparation of high fluorescent carbon quantum dots from orange waste peels for nonlinear optical applications

et al. 2019

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“…GQDs have recently attracted high interest as alternatives to metal-based semiconductor QDs for numerous applications, like bio-imaging [17,18] and drug delivery [19,20], light-emitting diodes [21][22][23], optoelectronic devices [24,25], electrocatalysis [26,27], or biosensors [28][29][30], due to these unique optical properties, high chemical and photo-stability, low toxicity, low cost, and easy functionalization.…”

Section: Introductionmentioning

confidence: 99%

One-Step Synthesis of Diamine-Functionalized Graphene Quantum Dots from Graphene Oxide and Their Chelating and Antioxidant Activities

et al. 2020

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2,2’-(Ethylenedioxy)bis(ethylamine)-functionalized graphene quantum dots (GQDs) were prepared under mild conditions from graphene oxide (GO) via oxidative fragmentation. The as-prepared GQDs have an average diameter of ca. 4 nm, possess good colloidal stability, and emit strong green-yellow light with a photoluminescence (PL) quantum yield of 22% upon excitation at 375 nm. We also demonstrated that the GQDs exhibit high photostability and the PL intensity is poorly affected while tuning the pH from 1 to 8. Finally, GQDs can be used to chelate Fe(II) and Cu(II) cations, scavenge radicals, and reduce Fe(III) into Fe(II). These chelating and reducing properties that associate to the low cytotoxicity of GQDs show that these nanoparticles are of high interest as antioxidants for health applications.

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“…[ 32 ] Also, CDots show competitive advantages to conventional QDs and perovskite QDs because they are cheap and low toxic, and have high QY, which make CDots promising candidates for LEDs. [ 33–35 ] However, there are no violet LEDs based on CDots that have been reported.…”

Section: Introductionmentioning

confidence: 99%

A Bright and Stable Violet Carbon Dot Light‐Emitting Diode

Wang

Zhang

et al. 2020

Advanced Optical Materials

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Violet light‐emitting diodes (LEDs) with emission at 400 nm are very important for solid‐state lighting, high‐density information storage, display technology, and biology medical treatment. Wide band‐gap semiconductors and/or the semiconductor quantum dots (QDs), typically based on heavy metals such as cadmium and lead, are promising candidates for the violet LEDs, but so far these have had external quantum efficiencies (EQEs) lower than 0.31% (luminance 147.6 cd cm−2; 410 nm). Herein, violet light‐emitting materials and the violet LED devices based on carbon dots (CDots) are presented. The CDots have absolute photoluminescence quantum yield of 23.9% and produce two‐narrow‐peak emission at 382 and 401 nm with narrow full‐width at half‐maximum about 30 nm, respectively. The violet LEDs based on these CDots display high performance with a maximum luminance of 163 cd m−2 (electroluminescence peak located at 408 nm; Commission International de I'Eclairage color coordinate (0.180, 0.121)) and high EQE of 0.831%, exceeding that of previously reported semiconductor QDs‐based violet LEDs. Moreover, these CDots‐based violet LEDs have a high current efficiency of 0.62 cd A−1, a long lifetime (T50, 50 h), as well as a low turn‐on voltage of 3.7 V.

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Photo‐and Electroluminescence from Nitrogen‐Doped and Nitrogen–Sulfur Codoped Graphene Quantum Dots

Cited by 130 publications

References 76 publications

Facile preparation of high fluorescent carbon quantum dots from orange waste peels for nonlinear optical applications

Facile preparation of high fluorescent carbon quantum dots from orange waste peels for nonlinear optical applications

One-Step Synthesis of Diamine-Functionalized Graphene Quantum Dots from Graphene Oxide and Their Chelating and Antioxidant Activities

A Bright and Stable Violet Carbon Dot Light‐Emitting Diode

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