The synthesis of green fluorescent carbon dots for warm white LEDs

Du, Qian; Zheng, Jingxia; Wang, Junli; Yang, Yongzhen; Liu, Xuguang

doi:10.1039/c8ra02226g

Cited by 44 publications

(24 citation statements)

References 56 publications

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“…The CCT of white LEDs prepared with blue CQDs as phosphor generally exceeds 6000 K, which belongs to cold white light and is suitable for both outdoor and office lighting. However, the introduction of green CQDs (g-CQDs) can significantly reduce the CCT of white LEDs, which can meet the requirements of indoor lighting (CCT < 5000 K) and thus broaden the application of CQDs in white LEDs [8]. Furthermore, with the rapid development of white LEDs, the demand of white LEDs for g-CQDs keeps increasing, where a high product yield (PY) of CQDs is required [6,8,9].…”

Section: Introductionmentioning

confidence: 99%

“…However, the introduction of green CQDs (g-CQDs) can significantly reduce the CCT of white LEDs, which can meet the requirements of indoor lighting (CCT < 5000 K) and thus broaden the application of CQDs in white LEDs [8]. Furthermore, with the rapid development of white LEDs, the demand of white LEDs for g-CQDs keeps increasing, where a high product yield (PY) of CQDs is required [6,8,9]. At the same time, the greater demand in brightness and efficiency of white LEDs needs the higher quantum yield (QY) of CQDs, therefore an efficient method to synthesize g-CQDs with both high PY (>50%) and high QY (>50%) needs to be explored.…”

Section: Introductionmentioning

confidence: 99%

“…Many researchers have recently synthesized g-CQDs with a lower value of QY of g-CQDs, which is generally lower than 50% [3,5,[8][9][10][11][12][13][14]. For example, Du et al [8] used pyrogallic acid as a carbon source, and the QY value of g-CQDs obtained by the one-step solvothermal method was 16.8%. Qu et al [9] adopted the mass ratio of 1:2 for citric acid and urea and used ethanol as the solvent.…”

Section: Introductionmentioning

confidence: 99%

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An Efficient Synthesis and Photoelectric Properties of Green Carbon Quantum Dots with High Fluorescent Quantum Yield

et al. 2020

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To greatly improve the production quality and efficiency of carbon quantum dots (CQDs), and provide a new approach for the large-scale production of high-quality CQDs, green carbon quantum dots (g-CQDs) with high product yield (PY) and high fluorescent quantum yield (QY) were synthesized by an efficient one-step solvothermal method with 2,7-dihydroxynaphthalene as the carbon source and ethylenediamine as the nitrogen dopant in this study. The PY and QY of g-CQDs were optimised by adjusting reaction parameters such as an amount of added ethylenediamine, reaction temperature, and reaction duration. The results showed that the maximum PY and QY values of g-CQDs were achieved, which were 70.90% and 62.98%, respectively when the amount of added ethylenediamine, reaction temperature, and reaction duration were 4 mL, 180 °C, and 12 h, respectively. With the optimised QY value of g-CQDs, white light emitting diodes (white LEDs) were prepared by combining g-CQDs and blue chip. The colour rendering index of white LEDs reached 87, and the correlated colour temperature was 2520 K, which belongs to the warm white light area and is suitable for indoor lighting. These results indicate that g-CQDs have potential and wide application prospects in the field of white LEDs.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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An Efficient Synthesis and Photoelectric Properties of Green Carbon Quantum Dots with High Fluorescent Quantum Yield

et al. 2020

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“…The HR XPS spectrum of N 1s contains three components that can be assigned to pyrrolic N (399.0 eV), graphite N (400.6 eV) and amino N (401.2 eV) (Figure 3g) [60,61]. The HR XPS of O 1s spectrum was deconvoluted into three peaks at 530.9 eV, 532.6 eV and 533.7 eV, corresponding to -OH, C=O and N-C=O, respectively (Figure 3h) [59,62]. shows obvious absorption peaks at 3432, 3273, 2939, 1712, 1659, 1400 and 1168 cm −1 , which are attributed to the stretching vibrations of O-H, N-H, -CH2-, C=O, C=C, C-N and C-O bonds, respectively [41,48,49].…”

Section: Morphologies and Structure Analyses Of Aa-cdsmentioning

confidence: 99%

Visible-Light-Excited Room Temperature Phosphorescent Carbon Dots

Jiang

Wang

et al. 2020

Nanomaterials

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Carbon dots (CDs) with a room temperature phosphorescent (RTP) feature have attracted considerable interest in recent years due to their fundamental importance and promising applications. However, the reported matrix-free RTP CDs only show short-wavelength (green to yellow) emissions and have to be triggered by ultraviolet (UV) light (below 400 nm), limiting their applications in certain fields. Herein, visible-light-excited matrix-free RTP CDs (named AA-CDs) with a long-wavelength (orange) emission are reported for the first time. The AA-CDs can be facilely prepared via a microwave heating treatment of L-aspartic acid (AA) in the presence of ammonia and they emit unique orange RTP in the solid state with visible light (420 nm) excitation just being switched off. Through the studies of the carbonization process, the C=O and C=N containing moieties in the AA-CDs are confirmed to be responsible for the observed RTP emission. Finally, the applications of AA-CDs in information encryption and anti-counterfeiting were preliminarily demonstrated.

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“…For the past decade, CDs have attracted much attention from researchers because of their promising fluorescence properties, low toxicity and low cost. So far, many different carbonaceous materials, including petroleum coke, anthracite, citric acid, pyrogallic acid, phloroglucinol, and so on, were used as carbon sources to synthesize CDs [2][3][4][5][6][7][8]. In recent years, the biomass-based CDs especially acquire sufficient attention because they are abundant and renewable [9].…”

Section: Introductionmentioning

confidence: 99%

Preparation of N-doped carbon dots based on starch and their application in white LED

et al. 2018

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The synthesis of green fluorescent carbon dots for warm white LEDs

Abstract: Green emissive carbon dots synthesized by solvothermal method is used for warm white light-emitting devices.

Cited by 44 publications

References 56 publications

An Efficient Synthesis and Photoelectric Properties of Green Carbon Quantum Dots with High Fluorescent Quantum Yield

An Efficient Synthesis and Photoelectric Properties of Green Carbon Quantum Dots with High Fluorescent Quantum Yield

Visible-Light-Excited Room Temperature Phosphorescent Carbon Dots

Preparation of N-doped carbon dots based on starch and their application in white LED

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