scholarly journals Microwave-Assisted Synthesis of Fluorescent Pyrido[2,3-b]indolizines from Alkylpyridinium Salts and Enaminones

Molecules ◽  
2020 ◽  
Vol 25 (18) ◽  
pp. 4059
Author(s):  
Ekaterina A. Sokolova ◽  
Alexey A. Festa ◽  
Karthikeyan Subramani ◽  
Victor B. Rybakov ◽  
Alexey V. Varlamov ◽  
...  
Keyword(s):  
Light Emission ◽  
Green Light ◽  
Quantum Yields ◽  
Microwave Assisted Synthesis ◽  
Fluorescence Quantum Yields ◽  
Microwave Assisted ◽  
Green Light Emission ◽  
Benign Solvents ◽  
High Fluorescence ◽  
Cyclocondensation Reactions

Pyridinium ylides are well recognized as dipoles for cycloaddition reactions. In its turn, the microwave-assisted interaction of N-(cyanomethyl)-2-alkylpyridinium salts with enaminones unexpectedly proceeds as a domino sequence of cycloisomerization and cyclocondensation reactions, instead of a 1,3-dipolar cycloaddition. The reaction takes place in the presence of sodium acetate as base and employs benign solvents. The optical properties of the resulting pyrido[2,3-b]indolizines were studied, showing green light emission with high fluorescence quantum yields.

scholarly journals Microwave-Assisted Preparation of Luminescent Inorganic Materials: A Fast Route to Light Conversion and Storage Phosphors

Molecules ◽  
2021 ◽  
Vol 26 (10) ◽  
pp. 2882
Author(s):  
José Miranda de Carvalho ◽  
Cássio Cardoso Santos Pedroso ◽  
Matheus Salgado de Nichile Saula ◽  
Maria Claudia França Cunha Felinto ◽  
Hermi Felinto de Brito
Keyword(s):  
Rapid Heating ◽  
Inorganic Materials ◽  
Rapid Screening ◽  
Conventional Heating ◽  
Quantum Yields ◽  
Microwave Assisted Synthesis ◽  
Volumetric Heating ◽  
White Leds ◽  
Microwave Assisted ◽  
And Storage

Luminescent inorganic materials are used in several technological applications such as light-emitting displays, white LEDs for illumination, bioimaging, and photodynamic therapy. Usually, inorganic phosphors (e.g., complex oxides, silicates) need high temperatures and, in some cases, specific atmospheres to be formed or to obtain a homogeneous composition. Low ionic diffusion and high melting points of the precursors lead to long processing times in these solid-state syntheses with a cost in energy consumption when conventional heating methods are applied. Microwave-assisted synthesis relies on selective, volumetric heating attributed to the electromagnetic radiation interaction with the matter. The microwave heating allows for rapid heating rates and small temperature gradients yielding homogeneous, well-formed materials swiftly. Luminescent inorganic materials can benefit significantly from the microwave-assisted synthesis for high homogeneity, diverse morphology, and rapid screening of different compositions. The rapid screening allows for fast material investigation, whereas the benefits of enhanced homogeneity include improvement in the optical properties such as quantum yields and storage capacity.

Regioselective Oxidative Cross-Coupling Reaction: Synthesis of Imidazo[1,2-a]pyridine Fluorophores

Synthesis ◽  
2021 ◽  
Author(s):  
Xianglong Chu ◽  
Yadi Niu ◽  
Chen Ma ◽  
Xiaodong Wang ◽  
Yunliang Lin ◽  
...  
Keyword(s):  
Photophysical Properties ◽  
Coupling Reaction ◽  
Cross Coupling ◽  
Quantum Yields ◽  
Fluorescence Quantum Yields ◽  
Cross Coupling Reaction ◽  
Color Tunable ◽  
Palladium Catalyzed ◽  
Structure Relationship ◽  
High Fluorescence

AbstractA rapid access to a series of N-heteroarene fluorophores has been developed on the basis of the palladium-catalyzed direct oxidative C–H/C–H coupling of imidazo[1,2-a]pyridines with thiophenes/furans. The photophysical properties–structure relationship was systematically investigated. The resulting N-heteroarene fluorophores present color-tunable emissions (λem: 431–507 nm in CH2Cl2) and high fluorescence quantum yields (up to 91% in CH2Cl2).

High-efficiency circularly polarized green light emission from GaN-based laser diodes integrated with GaN metasurface quarterwave plate

2021 ◽  
Vol 119 (24) ◽  
pp. 241103
Author(s):  
Miao Wang ◽  
Yu Lin ◽  
Jue-Min Yi ◽  
De-Yao Li ◽  
Jian-Ping Liu ◽  
...  
Keyword(s):  
High Efficiency ◽  
Light Emission ◽  
Laser Diodes ◽  
Green Light ◽  
Circularly Polarized ◽  
Green Light Emission

Blue-Green Light Emission from Self-Assembled Bipyridinium Thin Films

1998 ◽  
Vol 27 (9) ◽  
pp. 909-910 ◽  
Author(s):  
Haipeng Zheng ◽  
Ruifeng Zhang ◽  
Ying Wu ◽  
Jiacong Shen
Keyword(s):  
Thin Films ◽  
Light Emission ◽  
Green Light ◽  
Green Light Emission ◽  
Self Assembled

scholarly journals Ultrasonication-assisted trace amount solvent synthesis of Cs4PbBr6 crystal with ultra-bright green light emission

APL Materials ◽  
2020 ◽  
Vol 8 (7) ◽  
pp. 071115 ◽  
Author(s):  
Jintian Jiang ◽  
Daoyuan Wang ◽  
Mingfang Wu ◽  
Ping Peng ◽  
Fang-Fang Li ◽  
...  
Keyword(s):  
Trace Amount ◽  
Light Emission ◽  
Green Light ◽  
Green Light Emission ◽  
Bright Green

scholarly journals Nopinone-based aggregation-induced emission (AIE)-active difluoroboron β-diketonate complex: photophysical, electrochemical and electroluminescence properties

RSC Advances ◽  
2018 ◽  
Vol 8 (52) ◽  
pp. 30055-30060 ◽  
Author(s):  
Qian Jiang ◽  
Mingguang Zhang ◽  
Zhonglong Wang ◽  
Jie Song ◽  
Yiqin Yang ◽  
...  
Keyword(s):  
Green Light ◽  
Quantum Yields ◽  
Aggregation Induced Emission ◽  
Fluorescence Quantum Yields ◽  
Absolute Fluorescence

Four difluoroboron (BF2) β-diketonate nopinone complexes 3a–3d which exhibited typical AIE property were synthesized. Owing to high absolute fluorescence quantum yields of 3b, EL device based on 3b was fabricated, which exhibits a blue-green light.

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