Facilely synthesized carbon dots and configurated light-emitting diodes with efficient electroluminescence

Zhang, Xiaowen; Zeng, Liya; Sun, Tao; Xue, Xiaogang; Wei, Bin

doi:10.1039/d2cp04102b

Cited by 6 publications

(6 citation statements)

References 44 publications

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“…Different from powder processing and vacuum evaporation, in which vapor is transported to a substrate to form thin films, due to its simple operation process and low cost, spin-coating is compatible with widely available nanosized CDs that are easily carbonized at high temperatures. [160,161] However, during film processing, the film morphology and microstructure are completely different under different conditions, especially considering that CDs experience molecular rearrangement, aggregation and assembly that are quite different from the dispersed monomolecular structure in solution states. The commonly used processing techniques are still immature for CD materials whose optical properties are closely related to molecular interactions and spatial arrangements (Figure 10).…”

Section: Film Processing and Device Structural Optimizationmentioning

confidence: 99%

Carbon Dots for Electroluminescent Light‐Emitting Diodes: Recent Progress and Future Prospects

Shi

Yuan

et al. 2023

Advanced Materials

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Carbon dots (CDs), as emerging carbon nanomaterials, have been regarded as promising alternatives for electroluminescent light‐emitting diodes (LEDs) owing to their distinct characteristics, such as low toxicity, tuneable photoluminescence, and good photostability. In the last few years, despite remarkable progress achieved in CD‐based LEDs, their device performance is still inferior to that of well‐developed organic, heavy‐metal‐based QDs, and perovskite LEDs. To better exploit LED applications and boost device performance, in this review, a comprehensive overview of currently explored CDs is presented, focusing on their key optical characteristics, which are closely related to the structural design of CDs from their carbon core to surface modifications, and to macroscopic structural engineering, including the embedding of CDs in the matrix or spatial arrangement of CDs. The design of CD‐based LEDs for display and lighting applications based on the fluorescence, phosphorescence, and delayed fluorescence emission of CDs is also highlighted. Finally, it is concluded with a discussion regarding the key challenges and plausible prospects in this field. It is hoped that this review inspires more extensive research on CDs from a new perspective and promotes practical applications of CD‐based LEDs in multiple directions of current and future research.

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Section: Film Processing and Device Structural Optimizationmentioning

confidence: 99%

Carbon Dots for Electroluminescent Light‐Emitting Diodes: Recent Progress and Future Prospects

Shi

Yuan

et al. 2023

Advanced Materials

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“…[32] The long fluorescence lifetime provides much room for improving device stability and luminescent properties. [17,34]…”

Section: Cds Characteristicsmentioning

confidence: 99%

“…[7][8][9][10][11][12][13] The former benefits to realizing large-size displays and lighting. The stateof-the-art CDs-based electroluminescent LEDs are assembled using pure CDs emitter [14][15][16][17][18] or CDs-doped guest-host emitting system. [15,[19][20][21][22][23] Fantastic CDsbased LEDs have been rapidly developed after the first report by Ma et al [14] Device luminance with dozens to over a hundred cd m À2 has been demonstrated from pure CDs emitters.…”

Section: Introductionmentioning

confidence: 99%

Carrier Injection Tailoring and Electroluminescence Properties of Carbon Dots in Electroluminescent Light‐Emitting Diodes

Qu,

Yao,

et al. 2023

Physica Status Solidi (a)

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Fantastic carbon dots (CDs) are demonstrated as carrier injection tailoring and emitters of electroluminescent light‐emitting diodes (LEDs). Using N‐Methyl‐2‐pyrrolidone as carbon source, CDs are facilely synthesized by hydrothermal method. Transmission electron microscopy, X‐ray photoelectron spectroscopy, atomic force microscopy and photoluminescence measurements confirm the CDs showing good film morphology and particular electronic properties. With CDs doped poly(3,4‐ethylenedioxythiophene):poly(styrenesulfonate) tailoring hole injection, the 2‐(4‐biphenyl)‐5‐(4‐tert‐butylphenyl)‐1,3,4‐oxadiazole based UV organic LED (OLED) gives maximum radiance of 2.34 mW/cm2 and external quantum efficiency (EQE) of 1.51%. With CDs as electron injection layer, the inverted UV OLED shows maximum radiance of 1.13 mW/cm2 and EQE of 0.38%. The hole/electron injection characteristics are further elucidated using current‐voltage characteristics and impedance spectroscopy. Electroluminescent LEDs using pure CDs and CDs doped poly(9‐vinylcarbazole) (PVK) as emitters are demonstrated. The CDs based electroluminescent LED shows superior electro‐optical properties with maximum luminance of 48.67 cd/m2 at 8 V, luminous efficiency of 0.022 cd/A, power efficiency of 0.023 lm/W, and EQE of 0.023%, owing to the energy transfer from PVK to CDs. Our researches pave an alternative approach for broadening CDs applications and advancing novel electroluminescent LEDs.This article is protected by copyright. All rights reserved.

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“…This can be accomplished either via employing CQDs as a single emissive layer or blending them into organic agents like poly(N-vinylcarbazole) (PVK). 13 CQDs usually suffer from quenched luminescence in the solidstate form, 14 resulting in a reduced luminance for CQD-LED. 15 Doping CQDs in poly(N-vinylcarbazole) (PVK) is one way to improve the low luminance of the device to reach a desired blue, green, or red emission or to produce a white emission.…”

Section: Introductionmentioning

confidence: 99%

“…However, the fabrication of an electroluminescent WLED is more demanding and challenging from a technological point of view. This can be accomplished either via employing CQDs as a single emissive layer or blending them into organic agents like poly( N -vinylcarbazole) (PVK) . CQDs usually suffer from quenched luminescence in the solid-state form, resulting in a reduced luminance for CQD-LED .…”

Section: Introductionmentioning

confidence: 99%

Spectrally Tunable White Light-Emitting Diodes Based on Carbon Quantum Dot-Doped Poly(N-vinylcarbazole) Composites

Sahin Tiras,

Biçer,

Soheyli

et al. 2024

ACS Appl. Nano Mater.

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Electroluminescent white light-emitting diodes (WLEDs) are always of great interest for emerging display applications. Carbon-based quantum dots (CQDs) are the newest emerging nanoscale materials that can be employed for this purpose, owing to their broad and bright light emission properties. In the present work, highly luminescent CQDs with an emission quantum yield of 60% were prepared via a colloidal solvothermal method and subsequent silica gel column chromatography. The photoluminescence (PL) peak was located at 550 nm possessing yellow emission, with a full width at halfmaximum of 98 nm and a relatively long lifetime of 10.23 ns through a single-exponential recombination pathway. CQDs were employed in an electroluminescent device architecture of an ITO/PEDOT:PSS/TFB/CQD:PVK/TPBi/LiF/Al structure and blended with poly(N-vinylcarbazole) (PVK) to evaluate their ability to reach white electroluminescent emission. Results confirmed a high external quantum efficiency (EQE) of 0.76% and a maximum luminescence of 774.3 cd•m −2 . Tuning the ratio between CQDs and PVK from 1:10.25 to 1:5.75 resulted in a systematic shift in CIE x−y coordinates from 0.23−0.26 to 0.21−0.24, located close to the cool white region. The results of the present study can be considered a step forward in fabricating efficient WLEDs based on low-cost CQDs.

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Facilely synthesized carbon dots and configurated light-emitting diodes with efficient electroluminescence

Abstract: Carbon dots (CDs) are recently emerged photoluminescence (PL) and electroluminescence (EL) emitters and highly spotlighted in solid-sate lighting. Herein, exceptional CDs with fewer defects, high carbonation, good film morphology and...

Cited by 6 publications

References 44 publications

Carbon Dots for Electroluminescent Light‐Emitting Diodes: Recent Progress and Future Prospects

Carbon Dots for Electroluminescent Light‐Emitting Diodes: Recent Progress and Future Prospects

Carrier Injection Tailoring and Electroluminescence Properties of Carbon Dots in Electroluminescent Light‐Emitting Diodes

Spectrally Tunable White Light-Emitting Diodes Based on Carbon Quantum Dot-Doped Poly(N-vinylcarbazole) Composites

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