scholarly journals Red Emission Carbon Dots Prepared by 1,4-Diaminonaphthalene for Light-Emitting Diode Application and Metal Ion Detection

Materials ◽  
2021 ◽  
Vol 14 (16) ◽  
pp. 4716
Author(s):  
Yulong An ◽  
Xu Lin ◽  
Zewen Guo ◽  
Qitao Yin ◽  
Yan Li ◽  
...  
Keyword(s):  
Carbon Dots ◽  
Metal Ion ◽  
Light Emitting Diode ◽  
Wide Spectrum ◽  
Red Light ◽  
Light Emitting ◽  
Fluorescence Characteristics ◽  
Metal Ion Detection ◽  
Solvothermal Methods ◽  
Reaction Media

Carbon dots (CDs), as the most important type of carbon materials, have been widely used in many fields because of their unique fluorescence characteristics and excellent properties of biocompatibility. In previous studies, the fluorescence of CDs was mainly concentrated in the blue and green, whereas the red fluorescence was relatively less. Herein, we prepared efficient red-emitting CDs from 1,4-diaminonaphthalene using solvothermal methods. We discussed the effects of different solvothermal solvents on CDs. The results show that CDs prepared with octane and acetone as reaction media have the best fluorescence properties. The CDs dispersed in different organic solvents exhibited tunable emission across a wide spectrum from 427 nm to 679 nm. We further demonstrated the application of red light-emitting diode (LED) optoelectronics and fluorescence detection of Fe3+ in aqueous solution.

Remote Fiber-Optic Flow Cell for the Detection of Uranium(VI) in Groundwater

2002 ◽  
Vol 56 (4) ◽  
pp. 464-468 ◽  
Author(s):  
Greg E. Collins ◽  
Qin Lu ◽  
Sitra Abubeker ◽  
Elizabeth Vajs
Keyword(s):  
Metal Ion ◽  
Fiber Optic ◽  
Light Emitting Diode ◽  
Red Light ◽  
Arsenazo Iii ◽  
Reagent Solution ◽  
Light Emitting ◽  
Low Levels ◽  
Exchange Membrane

Optimization and initial characterization of a remote probe for extremely low levels (<20 μg/L) of uranium(VI) in groundwater are described. The monitor takes advantage of a small length of Nafion cation exchange membrane tubing, which permits diffusion of the uranyl ion into an internally renewable reagent solution of Arsenazo III. The sensitive, colorimetric metal complexation of uranium(VI) by Arsenazo III is measured by recording the absorbance change in a fiber-optic SMA Z-cell that is coupled to a red-light-emitting diode. The entire system is packaged on a 2 × 11 in. breadboard and attached to a 100-ft power and data transmission cord. The final optimized pH of 1.5 was utilized for maximizing sensitivity to uranium while minimizing interferences from other metal ion impurities. The addition of 1 mM diethylenetriaminepentaacetic acid to the reagent further assisted in the elimination of metal ion interferences. Two Nafion membrane tubings with different internal diameters and wall thicknesses are evaluated. Using a 20 min diffusion time and the Nafion 20 membrane, the detection limit obtained for uranium(VI) in groundwater was 1.4 ppb. Of the twenty metal ion interferents examined, all gave essentially no response, with the exception of calcium and thorium, for which a 30 mg/L and a 100 μg/L solution, respectively, gave signals representative of 4.7 and 6.0 ppb uranium(VI).

Fluorescent nanocomposites based on gold nanoclusters for metal ion detection and white light emitting diodes

Nanoscale ◽  
2021 ◽  
Vol 13 (7) ◽  
pp. 4140-4150
Author(s):  
Yongjie Zhang ◽  
Ning Feng ◽  
Shujin Zhou ◽  
Xia Xin
Keyword(s):  
White Light ◽  
Metal Ion ◽  
Light Emitting Diodes ◽  
Chemical Sensor ◽  
Light Emitting Diode ◽  
Gold Nanoclusters ◽  
Light Emitting ◽  
Emission Properties ◽  
Metal Ion Detection ◽  
White Light Emitting Diodes

Two nonocomposites with distinct emission properties were obtained by encapsulating MPA-AuNCs in either ZnS QDs or ZIF-8 shell, which were applied for discriminative chemical sensor and white light emitting diode respectively.

scholarly journals An Overview of the Recent Developments in Carbon Quantum Dots—Promising Nanomaterials for Metal Ion Detection and (Bio)Molecule Sensing

Chemosensors ◽  
2021 ◽  
Vol 9 (6) ◽  
pp. 138
Author(s):  
Silvija Šafranko ◽  
Dominik Goman ◽  
Anamarija Stanković ◽  
Martina Medvidović-Kosanović ◽  
Tihomir Moslavac ◽  
...  
Keyword(s):  
Quantum Dots ◽  
Carbon Dots ◽  
Metal Ion ◽  
Water Solubility ◽  
Wide Spectrum ◽  
Low Cost ◽  
Chemical Species ◽  
Carbon Quantum Dots ◽  
Recent Developments ◽  
Metal Ion Detection

The fluorescent carbon quantum dots (CQDs) represent an emerging subset of carbonaceous nanomaterials, recently becoming a powerful tool for biosensing, bioimaging, and drug and gene delivery. In general, carbon dots are defined as zero-dimensional (0D), spherical-like nanoparticles with <10 nm in size. Their unique chemical, optical, and electronic properties make CQDs versatile materials for a wide spectrum of applications, mainly for the sensing and biomedical purposes. Due to their good biocompatibility, water solubility, and relatively facile modification, these novel materials have attracted tremendous interest in recent years, which is especially important for nanotechnology and nanoscience expertise. The preparation of the biomass-derived CQDs has attracted growing interest recently due to their low-cost, renewable, and green biomass resources, presenting also the variability of possible modification for the enhancement of CQDs’ properties. This review is primarily focused on the recent developments in carbon dots and their application in the sensing of different chemical species within the last five years. Furthermore, special emphasis has been made regarding the green approaches for obtaining CQDs and nanomaterial characterization toward better understanding the mechanisms of photoluminescent behavior and sensing performance. In addition, some of the challenges and future outlooks in CQDs research have been briefly outlined.

scholarly journals Red Light-Emitting Diodes with All-Inorganic CsPbI3/TOPO Composite Nanowires Color Conversion Films

2020 ◽  
Vol 15 (1) ◽  
Author(s):  
Lung-Chien Chen ◽  
Yi-Tsung Chang ◽  
Ching-Ho Tien ◽  
Yu-Chun Yeh ◽  
Zong-Liang Tseng ◽  
...  
Keyword(s):  
Quantum Dots ◽  
Light Emitting Diode ◽  
Red Light ◽  
Trioctylphosphine Oxide ◽  
Optical And Electrical Properties ◽  
Colloidal Solutions ◽  
High Quality ◽  
Light Emitting ◽  
Hot Injection ◽  
Color Conversion

AbstractThis work presents a method for obtaining a color-converted red light source through a combination of a blue GaN light-emitting diode and a red fluorescent color conversion film of a perovskite CsPbI3/TOPO composite. High-quality CsPbI3 quantum dots (QDs) were prepared using the hot-injection method. The colloidal QD solutions were mixed with different ratios of trioctylphosphine oxide (TOPO) to form nanowires. The color conversion films prepared by the mixed ultraviolet resin and colloidal solutions were coated on blue LEDs. The optical and electrical properties of the devices were measured and analyzed at an injection current of 50 mA; it was observed that the strongest red light intensity was 93.1 cd/m2 and the external quantum efficiency was 5.7% at a wavelength of approximately 708 nm when CsPbI3/TOPO was 1:0.35.

Effects of electron-withdrawing groups in imidazole-phenanthroline ligands and their influence on the photophysical properties of EuIII complexes for white light-emitting diodes

2017 ◽  
Vol 41 (18) ◽  
pp. 9826-9839 ◽  
Author(s):  
Boddula Rajamouli ◽  
Rachna Devi ◽  
Abhijeet Mohanty ◽  
Venkata Krishnan ◽  
Sivakumar Vaidyanathan
Keyword(s):  
Thin Film ◽  
Quantum Yield ◽  
White Light ◽  
Light Emitting Diode ◽  
Photophysical Properties ◽  
Red Light ◽  
Europium Complexes ◽  
Light Emitting ◽  
White Light Emitting Diodes ◽  
Phenanthroline Ligands

The red light emitting diode (LED) was fabricated by using europium complexes with InGaN LED (395 nm) and shown digital images, corresponding CIE color coordinates (red region) as well as obtained highest quantum yield of the thin film (78.7%).

scholarly journals Effects of Light-Emitting Diodes on the Accumulation of Glucosinolates and Phenolic Compounds in Sprouting Canola (Brassica napus L.)

Foods ◽  
2019 ◽  
Vol 8 (2) ◽  
pp. 76 ◽  
Author(s):  
Chang Park ◽  
Nam Kim ◽  
Jong Park ◽  
Sook Lee ◽  
Jong-Won Lee ◽  
...  
Keyword(s):  
Brassica Napus ◽  
Phenolic Compounds ◽  
Light Emitting Diode ◽  
Red Light ◽  
Dry Weight ◽  
Total Phenolic ◽  
Brassica Napus L ◽  
Light Emitting ◽  
Led Light ◽  
Sprout Growth

In this study, we investigated optimal light conditions for enhancement of the growth and accumulation of glucosinolates and phenolics in the sprouts of canola (Brassica napus L.). We found that the shoot lengths and fresh weights of red light-irradiated sprouts were higher than those of sprouts exposed to white, blue, and blue + red light, whereas root length was not notably different among red, blue, white, and blue + red light treatments. The accumulations of total glucosinolates in plants irradiated with white, blue, and red lights were not significantly different (19.32 ± 0.13, 20.69 ± 0.05, and 20.65 ± 1.70 mg/g dry weight (wt.), respectively). However, sprouts exposed to blue + red light contained the lowest levels of total glucosinolates (17.08 ± 0.28 mg/g dry wt.). The accumulation of total phenolic compounds was the highest in plants irradiated with blue light (3.81 ± 0.08 mg/g dry wt.), 1.33 times higher than the lowest level in plants irradiated with red light (2.87 ± 0.05 mg/g dry wt.). These results demonstrate that red light-emitting diode (LED) light is suitable for sprout growth and that blue LED light is effective in increasing the accumulation of glucosinolates and phenolics in B. napus sprouts.

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