Synthesis and Photophysical Properties of Dibenzobarrelene-Incorporated 1,4-Diphenyl-1,3-pentadienes and a 5-Sila Derivative Having High Fluorescence Efficiency

2018 ◽  
Vol 2018 (8) ◽  
pp. 1011-1018 ◽  
Author(s):  
Akihiko Ishii ◽  
Mari Shibata ◽  
Ryota Ebina ◽  
Norio Nakata
Keyword(s):  
Photophysical Properties ◽  
Fluorescence Efficiency ◽  
High Fluorescence

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).

A quantitative description of photoluminescence efficiency of a carbazole-based thermally activated delayed fluorescence emitter

2019 ◽  
Vol 43 (15) ◽  
pp. 6032-6039
Author(s):  
Songyan Feng ◽  
Xugeng Guo ◽  
Jinglai Zhang
Keyword(s):  
Quantitative Description ◽  
Energy Difference ◽  
Delayed Fluorescence ◽  
Intersystem Crossing ◽  
Small Energy ◽  
Thermally Activated Delayed Fluorescence ◽  
Thermally Activated ◽  
Fluorescence Efficiency ◽  
High Fluorescence ◽  
Photoluminescence Efficiency

The present results reveal that the dominant charge transfer characteristics in the S1 and T1 states produce a small energy difference between the two states, and consequently an efficient reverse intersystem crossing process and a high fluorescence efficiency.

A highly selective fluorescent chemosensor based on naphthalimide and Schiff base units for Cu2+ detection in aqueous medium

2017 ◽  
Vol 72 (1) ◽  
pp. 35-41 ◽  
Author(s):  
Yuling Xu ◽  
Stephen Opeyemi Aderinto ◽  
Huilu Wu ◽  
Hongping Peng ◽  
Han Zhang ◽  
...  
Keyword(s):  
Schiff Base ◽  
Fluorescence Quenching ◽  
Aqueous Medium ◽  
High Selectivity ◽  
Photophysical Properties ◽  
Aqueous Media ◽  
Medium Ph ◽  
Absorption And Fluorescence Spectroscopy ◽  
High Fluorescence ◽  
Base Units

AbstractA new Schiff base, 4-allylamine-N-(N-5-methylsalicylidene)-1,8-naphthalimide (1), has been designed and synthesized by combining a 1,8-naphthalimide moiety as a fluorophore and a Schiff base as a recognition group. Its photophysical properties were investigated by absorption and fluorescence spectroscopy, and this sensor exhibits a high fluorescence quantum yield of 0.75–0.91 inorganic solvents of different polarity. It also shows high selectivity for Cu2+ over other ions with fluorescence quenching in aqueous medium (pH=7.2). The reason for this phenomenon (fluorescence quenching) is attributed to the formation of a 1:1 complex between 1 and Cu2+ according to the Job plot and fluorescence titration. The sensor can be applied to the quantification of Cu2+ in a linear fashion from 0.5 to 5 μM with a detection limit of 0.23 μM. Additionally, the association constant (Ka) between Cu2+ and 1 is 1.328×106 M−1 in aqueous media.

Non-symmetric 9,10-diphenylanthracene-based deep-blue emitters with enhanced charge transport properties

2014 ◽  
Vol 16 (15) ◽  
pp. 7089-7101 ◽  
Author(s):  
Tomas Serevičius ◽  
Regimantas Komskis ◽  
Povilas Adomėnas ◽  
Ona Adomėnienė ◽  
Vygintas Jankauskas ◽  
...  
Keyword(s):  
Charge Transport ◽  
Transport Properties ◽  
Deep Blue ◽  
Film Forming ◽  
Fluorescence Efficiency ◽  
High Carrier ◽  
Blue Emitters ◽  
High Fluorescence

Realization of 9,10-diphenylanthracene based deep-blue emitters exhibiting high fluorescence efficiency, demonstrating good film forming properties and high carrier drift mobilities is presented.

scholarly journals γ-Radiation Enhanced Luminescence of Thiol-Capped Quantum Dots in Aqueous Solution

Nanomaterials ◽  
2019 ◽  
Vol 9 (4) ◽  
pp. 506 ◽  
Author(s):  
Shuquan Chang ◽  
Xian Wu ◽  
Jianzhang Lan ◽  
Zheng Li ◽  
Xiaohong Zhang ◽  
...  
Keyword(s):  
Aqueous Solution ◽  
Quantum Dots ◽  
Photoelectron Spectroscopy ◽  
Fluorescence Emission ◽  
High Energy ◽  
Γ Radiation ◽  
X Ray ◽  
Fluorescence Efficiency ◽  
High Fluorescence ◽  
Xrd Patterns

Quantum dots (QDs) have attracted great attention due to their unique optical properties. High fluorescence efficiency is very important for their practical application. In this study, we report a simple and efficient strategy to enhance the photoluminescence of water-dispersed thiol-capped QDs using γ-radiation. Three kinds of QDs with different surface ligands and cores (MPA-CdTe, MPA-CdSe and Cys-CdTe) were fabricated and irradiated by high-energy γ-ray in an aqueous solution. Their photoluminescence intensities were significantly enhanced after irradiation, which were closely related to the radiation dose and the structure of QDs. The positions of the fluorescence emission peaks did not shift obviously after irradiation. The mechanism of photoluminescence enhancement was discussed based on the results of photoluminescence (PL) spectra, UV-visible light absorption (UV-vis) spectra, transmission electron microscope (TEM), X-ray diffraction (XRD) patterns, Fourier transform infrared (FT-IR) spectra and X-ray photoelectron spectroscopy (XPS). This method can be employed to uniformly treat large batches of QDs at room temperature and without other chemicals.

scholarly journals Designing highly fluorescent, arylated poly(phenylene vinylene)s of intrinsic microporosity

2020 ◽  
Vol 8 (7) ◽  
pp. 2248-2257
Author(s):  
Ana Clara B. Rodrigues ◽  
Isabell S. Geisler ◽  
Patrick Klein ◽  
João Pina ◽  
Fabian J. H. Neuhaus ◽  
...  
Keyword(s):  
Phenylene Vinylene ◽  
Fluorescence Efficiency ◽  
High Fluorescence ◽  
Intrinsic Microporosity

The design of new arylated poly(phenylene vinylene) with high fluorescence efficiency (from AIE) and intrinsic microporosity (from SBET) is described.

Highly-emissive solution-grown furan/phenylene co-oligomer single crystals

RSC Advances ◽  
2016 ◽  
Vol 6 (95) ◽  
pp. 92325-92329 ◽  
Author(s):  
Maxim S. Kazantsev ◽  
Ekaterina S. Frantseva ◽  
Liudmila G. Kudriashova ◽  
Vladislav G. Konstantinov ◽  
Artur A. Mannanov ◽  
...  
Keyword(s):  
Charge Transport ◽  
Transport Properties ◽  
Single Crystals ◽  
Fluorescence Efficiency ◽  
Efficient Charge ◽  
High Fluorescence

Solution-grown single crystals of furan/phenylene co-oligomer combine efficient charge transport properties and high fluorescence efficiency.

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