Engineering Photo-Luminescent Centers of Carbon Dots to Achieve Higher Quantum Yields

2020 ◽  
Vol 2 (8) ◽  
pp. 2470-2478
Author(s):  
Manasa Perikala ◽  
Asha Bhardwaj
Keyword(s):  
Carbon Dots ◽  
Quantum Yields ◽  
Photo Luminescent ◽  
Luminescent Centers

scholarly journals Tuning Carbon Dots’ Optoelectronic Properties with Polymers

Polymers ◽  
2018 ◽  
Vol 10 (12) ◽  
pp. 1312 ◽  
Author(s):  
Konstantinos Dimos
Keyword(s):  
Quantum Yield ◽  
Spectral Range ◽  
Carbon Dots ◽  
Surface Passivation ◽  
Low Cost ◽  
Quality Characteristics ◽  
Optoelectronic Properties ◽  
Quantum Yields

Due to their unique properties of photoluminescence, biocompatibility, photostability, ease of preparing, and low cost, carbon dots have been studied extensively over the last decade. Soon after their discovery, it was realized that their main optical attributes may be protected, enhanced, and tuned upon proper surface passivation or functionalization. Therefore, up to date, numerous polymers have been used for these purposes, resulting to higher-quality carbon dots regarding their quantum yield or further emission-related aspects and compared to the primitive, bare ones. Hence, this review aims to clarify the polymers’ role and effect on carbon dots and their features focusing on the quality characteristics of their photoluminescence upon passivation or functionalization. Given in fact the numbers of relevant publications, emphasis is given on recent articles capturing the latest advances for polymers in carbon dots for expanding emission lifetimes, advancing quantum yields, tuning emission wavelengths, enhancing specific spectral range absorption, and tailoring optoelectronic properties in general.

Green and Orange Emissive Carbon Dots with High Quantum Yields Dispersed in Matrices for Phosphor-Based White LEDs

2020 ◽  
Vol 8 (8) ◽  
pp. 3151-3161 ◽  
Author(s):  
Panpan Ma ◽  
Xiaobo Sun ◽  
Wei Pan ◽  
Guifeng Yu ◽  
Jinping Wang
Keyword(s):  
Carbon Dots ◽  
Quantum Yields ◽  
White Leds ◽  
High Quantum

scholarly journals One-step solvothermal synthesis of high-emissive amphiphilic carbon dots via rigidity derivation

2018 ◽  
Vol 9 (5) ◽  
pp. 1323-1329 ◽  
Author(s):  
Pei Zhao ◽  
Xuping Li ◽  
Glib Baryshnikov ◽  
Bin Wu ◽  
Hans Ågren ◽  
...  
Keyword(s):  
Carbon Dots ◽  
Solvothermal Synthesis ◽  
Quantum Yields ◽  
One Step ◽  
Chemical Strategy

Here we report a chemical strategy that uses rigid molecules to straightforwardly construct amphiphilic carbon dots (ACDs) with high luminescence quantum yields (QYs).

Understanding the Photoluminescence Mechanism of Carbon Dots

MRS Advances ◽  
2017 ◽  
Vol 2 (51) ◽  
pp. 2927-2934 ◽  
Author(s):  
Zhoufeng Jiang ◽  
Marta J. Krysmann ◽  
Antonios Kelarakis ◽  
Petr Koutnik ◽  
Pavel Anzenbacher ◽  
...  
Keyword(s):  
Carbon Dots ◽  
Quantum Yields ◽  
Excitation Wavelength ◽  
Time Resolved ◽  
Light Emitting ◽  
Dependent Component ◽  
Different Types ◽  
Photoluminescence Mechanism ◽  
Time Resolved Photoluminescence ◽  
Absolute Quantum

ABSTRACTThe carbon dots were investigated to reveal their light-emitting mechanism. The fluorescence spectra of carbon dots show typically two different types of photoluminescence: the excitation-independent component in the short wavelength, and the excitation-dependent component in the longer wavelength. The UV-Vis spectrum of carbon dots shows the absorption maximum of 340 nm which should be accredited to the n-π* transition of the carbonyl group in carbon dots. Absolute quantum yields of carbon dots dispersed in Polyvinyl alcohol is around 15% when the excitation wavelength is less than 425 nm, but decreases continuously when the excitation wavelength increases. The decay lifetimes of the carbon dots also show an abrupt change at excitation wavelength 425 nm. Time resolved photoluminescence was implemented from 31K to 291K to study the photoluminescence decay dynamics of carbon dots, resulting in the continuously decreasing of the lifetime as the temperature increases.

Norepinephrine derived carbon dots for live-cell imaging and effective hemoglobin determination

Soft Matter ◽  
2021 ◽  
Author(s):  
Zhenzhen Lu ◽  
Luke W Giles ◽  
Rico Tabor ◽  
Boon M. Teo
Keyword(s):  
Analytical Chemistry ◽  
Carbon Dots ◽  
Live Cell Imaging ◽  
Cell Imaging ◽  
Fluorescence Probes ◽  
Quantum Yields ◽  
Great Stability ◽  
Fluorescence Quantum Yields ◽  
High Fluorescence ◽  
Potential Use

Recently, carbon dots (CDs) have attracted wide attention for their potential use as fluorescence probes in biological and analytical chemistry due to their great stability and high fluorescence quantum yields....

scholarly journals Synthesis of Fluorescent Carbon Dots by Gastrointestinal Fluid Treatment of Mongolia Har Gabur

2017 ◽  
Vol 2017 ◽  
pp. 1-7 ◽  
Author(s):  
Tegexibaiyin Wang ◽  
Wen Zhang ◽  
Xiaofeng Zhang ◽  
Xilin Qiqige ◽  
Wuhan Qimuge ◽  
...  
Keyword(s):  
Carbon Dots ◽  
Quantum Yields ◽  
Pig Manure ◽  
Tem Analysis ◽  
Gastrointestinal Fluid ◽  
Wide Ph Range ◽  
Biological Labeling ◽  
Average Size ◽  
Fluorescent Carbon Dots ◽  
Fluorescent Carbon

Har Gabur is the carbide obtained from pig manure by burning. The fluorescent carbon dots (CDs) of Har Gabur were successfully synthesized through simulating the digestion process of human gastrointestinal tract. Transmission Electron Microscope (TEM) analysis showed that the average size of the prepared Har Gabur CDs was 4 nm, with good solubility in water and strong fluorescence under UV irradiation. The X-ray and Raman results showed that the Har Gabur CDs were mainly composed of oxygen “O” and carbon “C” elements, in the forms of “C=O” and “C-O.” The bond energy results showed that the nitrogen “N” atom presented as “C-N” form, which indicated that Har Gabur CDs also contain “N.” In photobleaching assay, Har Gabur CDs showed excellent light stability compared with ordinary organic dye, fluorescein, and Rhodamine B. The fluorescence intensity of Har Gabur CDs was fairly stable within a wide pH range of 3–10. When L-lysine and L-cysteine were applied for the passivation stage, the relative quantum yields were improved by 1.53 and 3.68 times, respectively. Finally, the fluorescence properties of Har Gabur CDs were tested in cells and zebrafish, illustrating that Har Gabur CD has potential in the application of biological labeling and imaging.

High-performance thermoplastic polyurethane elastomer/carbon dots bulk nanocomposites with strong luminescence

2020 ◽  
Vol 32 (7) ◽  
pp. 857-867
Author(s):  
Jingjing Bai ◽  
Weijie Ren ◽  
Yulong Wang ◽  
Xiaoxia Li ◽  
Cheng Zhang ◽  
...  
Keyword(s):  
Carbon Dots ◽  
High Performance ◽  
In Situ Polymerization ◽  
Thermoplastic Polyurethane ◽  
Elastic Response ◽  
Quantum Yields ◽  
Mechanical And Thermal Properties ◽  
Polyurethane Elastomer ◽  
Strong Luminescence ◽  
Thermoplastic Polyurethane Elastomer

In this work, high-performance thermoplastic polyurethane elastomer/carbon dots (TPU/CDs) bulk nanocomposites with strong luminescence were fabricated via in situ polymerization. The CDs were synthesized from citric acid and 2-aminothiophenol. Transmission electron microscope, Fourier transform infrared spectroscopy, X-ray photoelectron spectroscopy, and systematic characterization indicated the formation of the CDs and the covalent conjugation of the CDs with TPU. The optical properties of the TPU/CDs nanocomposites were characterized by ultraviolet–visible and fluorescence spectroscopy. Compared to the initial solid-state CDs (the absolute photoluminescence quantum yields (QY): 20%), all the composites exhibited stronger luminescence behavior. When the CDs content was 0.5 wt%, the QY was as high as 68%. Furthermore, the rheological, mechanical, and thermal properties of the nanocomposites were investigated. The rheological properties established the structure–property relationships of the composites. The incorporation of the CDs enhanced the elastic response in viscoelasticity of the nanocomposites. The tensile strength of 1.0 wt% CDs loaded TPU increased from 18.2 MPa to 28.6 MPa, nearly 57% higher than that of the neat TPU. Given the excellent Ag+ detection performance of the CDs, the high QY and the processability of the nanocomposites, Ag+ detection experiments for the composite film were performed. The study will facilitate the applications of luminescent nanocomposites in potential fields.

Enhanced Photoluminescence Properties of Carbon Dots by Doping with Europium

2016 ◽  
Vol 16 (4) ◽  
pp. 3735-3738 ◽  
Author(s):  
Yuan Chen ◽  
Jiafu Xu ◽  
Bitao Liu ◽  
Jiyun Li ◽  
Xiaomei Fang ◽  
...  
Keyword(s):  
Particle Size ◽  
Polyethylene Glycol ◽  
Small Particle ◽  
Carbon Dots ◽  
Quantum Yields ◽  
Small Particle Size ◽  
Photoluminescence Properties ◽  
Enhanced Photoluminescence ◽  
Potential Applications ◽  
Doped Carbon Dots

Europium (Eu) doped carbon dots (CDs) were synthesized via a rapid and simple microwave mediated method using polyethylene glycol (PEG) as a precursor, and characterized in detail. The results were that these as-prepared CDs showed a uniform and small particle size, and exhibit good photostability and high photoluminescence quantum yields. Additionally, it also found that the doped Eu would change the fluorescence properties, which indicates potential applications in the field of biolabeling.

scholarly journals N-doped carbon dots from phenol derivatives for excellent colour rendering WLEDs

RSC Advances ◽  
2018 ◽  
Vol 8 (9) ◽  
pp. 4850-4856 ◽  
Author(s):  
Qian Liu ◽  
Danting Li ◽  
Zhifeng Zhu ◽  
Shimeng Yu ◽  
Yan Zhang ◽  
...  
Keyword(s):  
Carbon Dots ◽  
Quantum Yields ◽  
White Leds ◽  
Phenol Derivatives ◽  
Doped Carbon Dots ◽  
Colour Rendering ◽  
Green Photoluminescence

Yellow-green photoluminescence carbon dots with different quantum yields were realized and used to fabricate white LEDs.

A facile large-scale microwave synthesis of highly fluorescent carbon dots from benzenediol isomers

2014 ◽  
Vol 2 (25) ◽  
pp. 5028-5035 ◽  
Author(s):  
Jun Wang ◽  
Changming Cheng ◽  
Ying Huang ◽  
Baozhan Zheng ◽  
Hongyan Yuan ◽  
...  
Keyword(s):  
Microwave Synthesis ◽  
Carbon Dots ◽  
Large Scale ◽  
Quantum Yields ◽  
Microwave Method ◽  
High Quantum ◽  
Fluorescent Carbon Dots ◽  
Fluorescent Carbon

Three different carbon dots with high quantum yields were prepared via microwave method within 2 min. The hydroquinone-derived CDs could easily penetrate cells in 30 min.

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