Insights on the solvatochromic effects in N-doped yellow-orange emissive carbon dots

2018 ◽  
Vol 42 (24) ◽  
pp. 19837-19843 ◽  
Author(s):  
Farwa Arshad ◽  
Ayan Pal ◽  
Md Atiur Rahman ◽  
Maroof Ali ◽  
Javed Alam Khan ◽  
...  
Keyword(s):  
Carbon Dots ◽  
Solvent Polarity ◽  
Synthetic Method ◽  
Transition Edge ◽  
Orange Region ◽  
Yellow Orange ◽  
Edge Band

We have demonstrated a rapid and facile synthetic method to prepare N-doped Cdots that has excitation independent-emission in yellow-orange region. The Cdots showed solvatochromic behavior in different solvents due to change in solvent polarity illustrating n → π* transition (edge band).

Eu3+ and Cu2+ ions doped ZnS microspheres emission in the yellow–orange region

2019 ◽  
Vol 30 (19) ◽  
pp. 18220-18226 ◽  
Author(s):  
C. K. Krishna Sagar ◽  
P. Sajan ◽  
M. Junaid Bushiri
Keyword(s):  
Orange Region ◽  
Yellow Orange

Synthesis and luminescence properties of a H2annealed Mn-doped Y3Al5O12:Ce3+single crystal for WLEDs

CrystEngComm ◽  
2015 ◽  
Vol 17 (24) ◽  
pp. 4554-4561 ◽  
Author(s):  
Guorui Gu ◽  
Weidong Xiang ◽  
Cheng Yang ◽  
Xiaojuan Liang
Keyword(s):  
Single Crystal ◽  
Emission Intensity ◽  
Annealing Temperature ◽  
Luminescence Properties ◽  
Blue Led ◽  
Grown Sample ◽  
Orange Region ◽  
Yellow Orange ◽  
Mn Doped

Compared to the blue LED chip and the as-grown sample, upon increasing the annealing temperature, the emission intensity in the yellow-orange region is enhanced and reaches the highest at 1550 °C.

High luminescent yield from Mn doped ZnS at yellow–orange region and 367nm

2015 ◽  
Vol 158 ◽  
pp. 110-115 ◽  
Author(s):  
P. Sajan ◽  
R. Vinod ◽  
M. Junaid Bushiri
Keyword(s):  
Orange Region ◽  
Yellow Orange ◽  
Mn Doped

Influence of thermal treatment conditions (solvothermal versus microwave) and solvent polarity on morphology and emission of phloroglucinol-based nitrogen-doped carbon dots

Nanoscale ◽  
2021 ◽  
Author(s):  
Pavel D. Khavlyuk ◽  
Evgenia A. Stepanidenko ◽  
Daniil P. Bondarenko ◽  
Denis V. Danilov ◽  
Aleksandra V. Koroleva ◽  
...  
Keyword(s):  
Optical Properties ◽  
Surface Modification ◽  
Thermal Treatment ◽  
Carbon Dots ◽  
Solvent Polarity ◽  
Nitrogen Doped ◽  
Treatment Conditions ◽  
Doped Carbon Dots ◽  
Nitrogen Doped Carbon

Optical properties of the chemically synthesized carbon dots (CDs) can be widely tuned via doping and surface modification with heteroatoms such as nitrogen, which results in a range of potential...

scholarly journals Multicolor Emitting N-Doped Carbon Dots Derived from Ascorbic Acid and Phenylenediamine Precursors

2020 ◽  
Vol 15 (1) ◽  
Author(s):  
Linlin Wang ◽  
Won Mook Choi ◽  
Jin Suk Chung ◽  
Seung Hyun Hur
Keyword(s):  
Ascorbic Acid ◽  
Surface Charge ◽  
Carbon Dots ◽  
Solvent Polarity ◽  
Solution Ph ◽  
Emission Properties ◽  
Pl Emission ◽  
Ph Dependent ◽  
Doped Carbon Dots ◽  
Orange Color

AbstractIn this research, we report the green, blue, and orange color emitting N-doped carbon dots (CDs), which are being synthesized from ascorbic acid and o-/m-/p-phenylenediamine (o-PDA, m-PDA, and p-PDA, respectively). The effects of the solvent polarity and solution pH on the PL emission properties of the as-synthesized CDs have been systematically investigated. It has been observed that the PL emission of the as-synthesized CDs decreases with the increase in solvent polarity due to the greater agglomeration. The surface charge of CDs also shows prominent effects on the pH-dependent PL emission properties.

N, B-Codoping Induces High-Efficiency Solid-State Fluorescence and Dual Emission of Yellow/Orange Carbon Dots

2021 ◽  
Vol 9 (5) ◽  
pp. 2224-2236
Author(s):  
Junli Wang ◽  
Qiang Li ◽  
Jingxia Zheng ◽  
Yongzhen Yang ◽  
Xuguang Liu ◽  
...  
Keyword(s):  
Solid State ◽  
Carbon Dots ◽  
High Efficiency ◽  
Dual Emission ◽  
Yellow Orange ◽  
Solid State Fluorescence

The effect of solvent polarity on emission properties of carbon dots and their uses in colorimetric sensors for water and humidity

2019 ◽  
Vol 119 ◽  
pp. 110564 ◽  
Author(s):  
Hye Jin Lee ◽  
Jayasmita Jana ◽  
Yen-Linh Thi Ngo ◽  
Lin Lin Wang ◽  
Jin Suk Chung ◽  
...  
Keyword(s):  
Carbon Dots ◽  
Solvent Polarity ◽  
Emission Properties ◽  
Effect Of Solvent ◽  
Colorimetric Sensors

scholarly journals Hydrothermal Synthesis of Multi-Color Fluorescent Carbon Dots from Sappan Wood (Caesalpinia sappan) as an Acid-Base Indicator

2020 ◽  
Vol 71 (8) ◽  
pp. 106-112
Author(s):  
Adin Hasrudin ◽  
Zaenal Abidin ◽  
Nurul Hiedayati ◽  
Vicky Prajaputra
Keyword(s):  
Phenolic Compounds ◽  
Carbon Dots ◽  
Treatment Process ◽  
Uv Light ◽  
Alkaline Condition ◽  
Acid Base ◽  
Caesalpinia Sappan ◽  
Treated Sample ◽  
Yellow Orange ◽  
Ft Ir

Caesalpinia sappan L., known as sappan wood, has been extensively explored by many researchers because it contains various structural types of phenolic compounds. This study objectives are to investigate the effect of pH on the flourescent color of carbon dots (CDs) from sappan wood and its application as an acid-base indicator under UV light for the first time. CDs were synthesized through the hydrothermal route in ethanol solvents. The synthesized CDs were further characterized by UV-Vis spectrophotometry, fluorescence and Fourier Transform Infrared (FT-IR) spectroscopy. Based on the results, CD solutions performed multiple flourescent colors (yellow, orange and green) under UV light at 365 nm when the pH was adjusted to be 1, 3, 5, 7, 9 and 11. These multiple colors were produced because of the instability of phenolic compounds in the sample, especially brazilin which was easily oxidized to brazilein in alkaline condition. According to the FT-IR spectra, the most prominent differences of the sample before and after the treatment process was observed in the peak region ranging from 1500-1700 cm-1. The characteristic band of carbonyl groups was identified at 1697 cm-1 in the treated sample (pH 9), but it was unobserved in the spectrum of sappan wood and the treated sample (pH 5). The presence of carbonyl group can be assumed that brazilin has been oxidized to brazilein after the alkaline treatment process and making the flourescent color was gradually shifted from yellow to green. Under normal light, the sappan wood�s extract and CD solution produced yellow and red colors in acidic and alkaline conditions, respectively. However, only CD solutions which have yellow, orange and green emissions in different pH conditions under UV light. Therefore, the synthesized CDs can be used as an acid-base indicator in both different light conditions.

Direct Cyclization of Alkenyl Thioester via Transition Metal‐hydrogen Atom Transfer/radical‐polar Crossover Mechanism

2019 ◽  
Author(s):  
Shiori Date ◽  
Kensei Hamasaki ◽  
Karen Sunagawa ◽  
Hiroki Koyama ◽  
Chikayoshi Sebe ◽  
...  
Keyword(s):  
Natural Products ◽  
Hydrogen Atom ◽  
Transition Metal ◽  
Hydrogen Atom Transfer ◽  
Synthetic Method ◽  
Atom Transfer ◽  
Reaction Conditions ◽  
Hydride Hydrogen ◽  
Sulfur Heterocycles ◽  
One Step

<div>We report here a catalytic, Markovnikov selective, and scalable synthetic method for the synthesis of saturated sulfur heterocycles, which are found in the structures of pharmaceuticals and natural products, in one step from an alkenyl thioester. Unlike a potentially labile alkenyl thiol, an alkenyl thioester is stable and easy to prepare. The powerful Co catalysis via a cobalt hydride hydrogen atom transfer and radical-polar crossover mechanism enabled simultaneous cyclization and deprotection. The substrate scope was expanded by the extensive optimization of the reaction conditions and tuning of the thioester unit.</div>

Sign in / Sign up

Export Citation Format

Share Document