A Self‐Quenching‐Resistant Carbon‐Dot Powder with Tunable Solid‐State Fluorescence and Construction of Dual‐Fluorescence Morphologies for White Light‐Emission

Chen, Yonghao; Zheng, Mingtao; Xiao, Yong; Dong, Hanwu; Zhang, Haoran; Zhuang, Jianle; Hu, Hang; Lei, Bingfu; Liu, Yingliang

doi:10.1002/adma.201503380

Cited by 549 publications

(410 citation statements)

References 39 publications

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“…In water, the CDs were kind of aggregated and the fluorescence was thus greatly quenched because of the excessive resonance energy transfer or π–π interactions. 35–38 …”

Section: Resultsmentioning

confidence: 99%

Excitation wavelength independent visible color emission of carbon dots

et al. 2017

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Carbon dots (CDs) usually emit a strong blue light and excitation wavelength dependent long wavelength lights. This significantly limits their applications because one has to use a series of different excitation light sources to get different colors and the long wavelength emissions are usually very weak. We found that one type of CDs synthesized from p-phenylenediamine could emit various long wavelength lights (green to red) independent of the excitation wavelength when dispersed in different solvents. The photoluminescence quantum yields of the same CDs were 10–35% in different solvents for different color emissions. Based on this solvent-color effect, we further mixed the same CDs with different polymers to form solid CD films for various color emissions, and these film emissions were also excitation wavelength independent. Multicolor LEDs were demonstrated with the same CDs in solution and solid film states for color displays.

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“…In water, the CDs were kind of aggregated and the fluorescence was thus greatly quenched because of the excessive resonance energy transfer or π–π interactions. 35–38 …”

Section: Resultsmentioning

confidence: 99%

Excitation wavelength independent visible color emission of carbon dots

et al. 2017

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“…4(b), the absorption intensity of the wavelength that overlapped the short wavelength of emission was larger than that overlapped the long one, which resulted in stronger self-absorption in the short wavelength. This kind of spectral overlap usually can be described in terms of Förster distance (R 0 ), and red-shift induced by the re-absorption always occurs in small interparticle distance less than R 0 [22,23]. In our case, the QDs particles would aggregate together after toluene volatilized.…”

Section: Optical Properties Of the As-fabricated Green Leds During Comentioning

confidence: 96%

Highly pure green light emission of perovskite CsPbBr_3 quantum dots and their application for green light-emitting diodes

Li¹,

Zang²,

Chen³

et al. 2016

Opt. Express

160

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All-inorganic perovskite CsPbBr₃ quantum dots (QDs) with an emission peak of around 520 nm were synthesized by a hot-injection method, and were systematically studied as green phosphor for light-emitting diodes (LEDs). Highly pure green light with an emission peak of 534 nm and a full-width at half-maximum (FWHM) about 20 nm was achieved using CsPbBr₃ QDs and GaN LEDs. Commission Internationale Ed I'Eclairage coordinate of the fabricated green LEDs was (0.203, 0.757). Compared to GaN LEDs, the current-voltage characteristic of the green LED did not show any degradation. Moreover, the green LEDs displayed a luminous efficiency of 31.92 lm/W under an injection current of 10 mA.

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“…The choice of GPTMS also provides other indirect advantages: firstly, the GPTMS aliphatic chain is expected to prevent the C-dots aggregation, which is responsible for fluorescence quenching, especially at high concentrations. Quenching is particularly detrimental for optoelectronic devices and sensors which require solid-state emitting materials and should be carefully avoided 26 . Secondly, the use of GPTMS is expected to improve the stability of the C-dots in solid-state.…”

Section: Introductionmentioning

confidence: 99%

Design of Carbon Dots Photoluminescence through Organo-Functional Silane Grafting for Solid-State Emitting Devices

Suzuki

Malfatti

Takahashi

et al. 2017

Sci Rep

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Advanced optical applications of fluorescent carbon dots (C-dots) require highly integrated host-guest solid-state materials with a careful design of C-dots – matrix interface to control the optical response. We have developed a new synthesis based on the grafting of an organo-functional silane (3-glycidyloxypropyltrimethoxysilane, GPTMS) on amino-functionalized C-dots, which enables the fabrication of highly fluorescent organosilica-based hybrid organic-inorganic films through sol-gel process. The GPTMS grafting onto C-dots has been achieved via an epoxy–amine reaction under controlled conditions. Besides providing an efficient strategy to embed C-dots into a hybrid solid-state material, the modification of C-dots surface by GPTMS allows tuning their photoluminescence properties and gives rise to an additional, intense emission around 490 nm. Photoluminescence spectra reveal an interaction between C-dots surface and the polymeric chains which are locally formed by GPTMS polymerization. The present method is a step forward to the development of a surface modification technology aimed at controlling C-dots host-guest systems at the nanoscale.

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A Self‐Quenching‐Resistant Carbon‐Dot Powder with Tunable Solid‐State Fluorescence and Construction of Dual‐Fluorescence Morphologies for White Light‐Emission

Cited by 549 publications

References 39 publications

Excitation wavelength independent visible color emission of carbon dots

Excitation wavelength independent visible color emission of carbon dots

Highly pure green light emission of perovskite CsPbBr_3 quantum dots and their application for green light-emitting diodes

Design of Carbon Dots Photoluminescence through Organo-Functional Silane Grafting for Solid-State Emitting Devices

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