scholarly journals Microwave-Assisted Synthesis of an Alternant Poly(fluorene–oxadiazole). Synthesis, Properties, and White Light-Emitting Devices

Polymers ◽  
2019 ◽  
Vol 11 (10) ◽  
pp. 1562
Author(s):  
Dumitru Popovici ◽  
Andrei Diaconu ◽  
Aurelian Rotaru ◽  
Luminita Marin
Keyword(s):  
Oxidative Polymerization ◽  
Polarized Light ◽  
Gel Permeation Chromatography ◽  
Complete Separation ◽  
Microwave Assisted Synthesis ◽  
Compact Structure ◽  
Light Emitting ◽  
Light Emitting Devices ◽  
Microwave Assisted ◽  
Synthesis Properties

An alternant poly(dihexyl fluorene-co diphenyl oxadiazole) has been synthetized by microwave-assisted oxidative polymerization. The structure has been confirmed by 1H-NMR and FTIR spectroscopies. Gel permeation chromatography indicated high molecular weight and low polydispersity index. DFT calculations suggested a complete separation of HOMO and LUMO orbitals, which were located on fluorene and oxadiazole moiety, respectively. X-ray diffraction, polarized light microscopy, and atomic force microscopy indicated the polymer tendency to stack into a layered morphology with a more compact structure for the films prepared by spin coating. Furthermore, UV-vis and photoluminescence spectroscopies indicated the formation of H-aggregates which played a key role in photoluminescence quenching in solid state. Nevertheless, the good charge mobility gained due to the orbital overlapping in H-aggregates led to excellent electroluminescence, which enabled the development of white OLED devices with outstanding stability.

scholarly journals Microwave Synthesized Functional Dyes

2021 ◽  
Author(s):  
Sheetal Marganakop ◽  
Pramod Kattimani ◽  
Sudha Belgur Satyanarayana ◽  
Ravindra Kamble
Keyword(s):  
Organic Semiconductors ◽  
Electronic Materials ◽  
Dye Sensitized Solar Cells ◽  
Microwave Assisted Synthesis ◽  
Light Emitting ◽  
Light Emitting Devices ◽  
Microwave Assisted ◽  
Recent Developments ◽  
Functional Dyes ◽  
Photochromic Materials

Microwave chemistry involves the application of microwave radiation to chemical reactions and has played an important role in organic synthesis. Functional dyes are those with hi-tech applications and this chapter attempts to provide an overview of the recent developments in microwave-assisted synthesis of functional dyes. Emphasis has been paid to the microwave-assisted synthesis of dye molecules which are useful in hi-tech applications such as optoelectronics (dye-sensitized solar cells), photochromic materials, liquid crystal displays, newer emissive displays (organic-light emitting devices), electronic materials (organic semiconductors), imaging technologies (electrophotography viz., photocopying and laser printing), biomedical applications (fluorescent sensors and anticancer treatment such as photodynamic therapy). In this chapter, the advantages of microwaves as a source of energy for heating synthesis reactions have been demonstrated. The use of microwaves to functional dyes is a paradigm shift in dye chemistry. Until recently most academic laboratories did not practice this technique in the synthesis of such functional dyes but many reports are being appeared in the journals of high repute.

Microwave-assisted synthesis of high-quality “all-inorganic” CsPbX3 (X = Cl, Br, I) perovskite nanocrystals and their application in light emitting diodes

2017 ◽  
Vol 5 (42) ◽  
pp. 10947-10954 ◽  
Author(s):  
Qi Pan ◽  
Huicheng Hu ◽  
Yatao Zou ◽  
Min Chen ◽  
Linzhong Wu ◽  
...  
Keyword(s):  
Light Emitting Diodes ◽  
Microwave Assisted Synthesis ◽  
High Quality ◽  
Light Emitting ◽  
Perovskite Nanocrystals ◽  
Microwave Assisted

A fast and efficient microwave-assisted strategy is developed to prepare high-quality CsPbX3 nanocrystals with controllable morphologies (nanoplate, nanocube, and nanorod).

scholarly journals Microwave-assisted synthesis of high thermal stability and colourless polyimides containing pyridine

2019 ◽  
Vol 6 (6) ◽  
pp. 190196 ◽  
Author(s):  
Kai Cheng ◽  
Jie-pin Hu ◽  
Yan-cheng Wu ◽  
Chu-qi Shi ◽  
Zhi-geng Chen ◽  
...  
Keyword(s):  
Thermal Stability ◽  
Synthesis Method ◽  
Optical Transmittance ◽  
Aromatic Diamine ◽  
Microwave Assisted Synthesis ◽  
Step Method ◽  
Light Emitting ◽  
Microwave Assisted ◽  
One Step ◽  
Biphenyltetracarboxylic Dianhydride

A novel aromatic diamine containing pyridyl side group, 4-pyridine-4,4-bis(3,5-dimethyl-5-aminophenyl)methane (PyDPM), was successfully synthesized via electrophilic substitution reaction. The polyimides (PIs) containing pyridine were obtained via the microwave-assisted one-step polycondensation of the PyDPM with pyromellitic dianhydride (PMDA), 3,3′,4,4′-biphenyltetracarboxylic dianhydride (BPDA), 3,3′,4,4′-diphenylether tetracarboxylic dianhydride (ODPA) and 4,4′-(hexafluoroisopropylidene)diphthalic anhydride (6FDA). Contrarily to the reported similar PIs, these PIs exhibit much higher thermal stability or heat resistance, i.e. high glass transition temperatures ( T g s) in the range of 358–473°C, and the decomposition temperatures at 5% weight loss over 476°C under nitrogen. They can afford flexible and strong films with tensile strength of 82.1–93.3 MPa, elongation at break of 3.7%–15.2%, and Young's modulus of 3.3–3.8 GPa. Furthermore, The PI films exhibit good optical transparency with the cut-off wavelength at 313–366 nm and transmittance higher than 73% at 450 nm. The excellent thermal and optical transmittance can be attributed to synthesis method and the introduction of pyridine rings and ortho-methyl groups. The inherent viscosities of PIs via one-step method were found to be 0.58–1.12 dl g −1 in DMAc, much higher than those via two-step method. These results indicate these PIs could be potential candidates for optical substrates of organic light emitting diodes (OLEDs).

Microwave-Assisted Synthesis of CdS/ZnS:Cu Quantum Dots for White Light-Emitting Diodes with High Color Rendition

2015 ◽  
Vol 27 (4) ◽  
pp. 1187-1193 ◽  
Author(s):  
Tong-Tong Xuan ◽  
Jia-Qing Liu ◽  
Rong-Jun Xie ◽  
Hui-Li Li ◽  
Zhuo Sun
Keyword(s):  
Quantum Dots ◽  
White Light ◽  
Light Emitting Diodes ◽  
Microwave Assisted Synthesis ◽  
Light Emitting ◽  
Microwave Assisted ◽  
White Light Emitting Diodes

Rapid microwave-assisted synthesis of highly luminescent nitrogen-doped carbon dots for white light-emitting diodes

2017 ◽  
Vol 73 ◽  
pp. 319-329 ◽  
Author(s):  
Yaling Wang ◽  
Jingxia Zheng ◽  
Junli Wang ◽  
Yongzhen Yang ◽  
Xuguang Liu
Keyword(s):  
White Light ◽  
Carbon Dots ◽  
Light Emitting Diodes ◽  
Microwave Assisted Synthesis ◽  
Light Emitting ◽  
Nitrogen Doped ◽  
Microwave Assisted ◽  
Doped Carbon Dots ◽  
Nitrogen Doped Carbon ◽  
White Light Emitting Diodes

Microwave-assisted synthesis of benazoxoazol derivatives and their applications for phosphors of white light-emitting diodes

2013 ◽  
Vol 142 ◽  
pp. 173-179 ◽  
Author(s):  
Wen-Lung Lee ◽  
Lung-Chang Liu ◽  
Ming-Hua Chung ◽  
Chien-Ming Chen ◽  
Jian-Shian Lin
Keyword(s):  
White Light ◽  
Light Emitting Diodes ◽  
Microwave Assisted Synthesis ◽  
Light Emitting ◽  
Microwave Assisted ◽  
White Light Emitting Diodes

Microwave-assisted hydrothermal synthesis of solid-state carbon dots with intensive emission for white light-emitting devices

2017 ◽  
Vol 5 (32) ◽  
pp. 8105-8111 ◽  
Author(s):  
Jingxia Zheng ◽  
Yaling Wang ◽  
Feng Zhang ◽  
Yongzhen Yang ◽  
Xuguang Liu ◽  
...  
Keyword(s):  
Hydrothermal Synthesis ◽  
Solid State ◽  
Hydrothermal Method ◽  
White Light ◽  
Carbon Dots ◽  
Light Emitting ◽  
Light Emitting Devices ◽  
Microwave Assisted ◽  
State Luminescence

Carbon dots synthesized by a microwave-assisted hydrothermal method exhibit efficient solid-state luminescence for white light-emitting devices.

Microwave assisted synthesis & properties of nano HA-TCP biphasic calcium phosphate

2012 ◽  
Vol 19 (5) ◽  
pp. 441-445 ◽  
Author(s):  
E. Ghomash Pasand ◽  
A. Nemati ◽  
M. Solati-Hashjin ◽  
K. Arzani ◽  
A. Farzadi
Keyword(s):  
Calcium Phosphate ◽  
Biphasic Calcium Phosphate ◽  
Microwave Assisted Synthesis ◽  
Microwave Assisted ◽  
Synthesis Properties
Sign in / Sign up

Export Citation Format

Share Document