Electronic Structure and Photophysical Characteristics of Substituted 3-(2-Benzthiazolyl)-Coumarins and Coumarinimines

1987 ◽  
Vol 42 (9) ◽  
pp. 987-993
Author(s):  
P. Nikolova ◽  
N. Tyutyulkova ◽  
V. Dryanska
Keyword(s):  
Electronic Structure ◽  
Quantum Yield ◽  
Quantum Chemical ◽  
Fluorescence Quantum Yield ◽  
Spectral Properties ◽  
High Fluorescence ◽  
High Fluorescence Quantum Yield

The spectral properties of a group of 3-(2-benzthiazolyl)-coumarins and coumarinimines, some of them having high fluorescence quantum yield (Qf > 0.7), are described.The quantum -chemical investigations show that the main chromophore of this group of dyes is the 3 -(2-thiazolyl)-2 H -pyran -2-one fragmenti.e . the coumarin (coumarinimine) and the benzthiazolyl fragments are not separate chromophores.

Facile preparation of solid-state fluorescent carbon dots with high fluorescence quantum yield and application in rapid latent fingerprints detection

2021 ◽  
Author(s):  
Hai-Jiao Wang ◽  
Wan-Yi Hou ◽  
Jing Kang ◽  
Xin-Yu Zhai ◽  
Hongli Chen ◽  
...  
Keyword(s):  
Solid State ◽  
Quantum Yield ◽  
Fluorescence Quantum Yield ◽  
Latent Fingerprints ◽  
Energy Resonance ◽  
Facile Preparation ◽  
High Fluorescence ◽  
Fluorescent Carbon Dots ◽  
High Fluorescence Quantum Yield ◽  
Resonance Transfer

Due to the direct π - π interaction and excessive energy resonance transfer, it is very challenging to prepare CDs with high fluorescence quantum yield (QY) in solid state. In...

scholarly journals Unusually large fluorescence quantum yield for a near-infrared emitting DNA-stabilized silver nanocluster

2020 ◽  
Vol 56 (47) ◽  
pp. 6384-6387
Author(s):  
Vlad A. Neacşu ◽  
Cecilia Cerretani ◽  
Mikkel B. Liisberg ◽  
Steven M. Swasey ◽  
Elisabeth G. Gwinn ◽  
...  
Keyword(s):  
Quantum Yield ◽  
Fluorescence Quantum Yield ◽  
Near Infrared ◽  
Infrared Region ◽  
Silver Nanoclusters ◽  
Silver Nanocluster ◽  
Dna Strands ◽  
Near Infrared Region ◽  
High Fluorescence ◽  
High Fluorescence Quantum Yield

Silver nanoclusters stabilized by 5′-CCCGGAGAAG-3′ DNA strands display an unusually high fluorescence quantum yield in the near-infrared region.

scholarly journals Achieving remarkable and reversible mechanochromism from a bright ionic AIEgen with high specificity for mitochondrial imaging and secondary aggregation emission enhancement for long-term tracking of tumors

2020 ◽  
Vol 4 (3) ◽  
pp. 941-949 ◽  
Author(s):  
Xinzhe Yang ◽  
Qian Wang ◽  
Peiyu Hu ◽  
Chao Xu ◽  
Wenjing Guo ◽  
...  
Keyword(s):  
Quantum Yield ◽  
Cancer Cells ◽  
Fluorescence Quantum Yield ◽  
High Specificity ◽  
Emission Enhancement ◽  
High Fluorescence ◽  
High Fluorescence Quantum Yield

An ionic AIEgen with high fluorescence quantum yield shows remarkable and reversible mechanochromism as well as excellent mitochondrial imaging of cancer cells and long-term tracking of tumors.

Forcing dimethylacridine crooking to improve the efficiency of orange-red thermally activated delayed fluorescent emitters

2020 ◽  
Vol 8 (30) ◽  
pp. 10416-10421
Author(s):  
Feng-Yan Hao ◽  
Yi-Zhong Shi ◽  
Kai Wang ◽  
Xiao-Chun Fan ◽  
Lin Wu ◽  
...  
Keyword(s):  
Quantum Yield ◽  
Steric Hindrance ◽  
Fluorescence Quantum Yield ◽  
Energy Splitting ◽  
Triplet Energy ◽  
Thermally Activated ◽  
High Fluorescence ◽  
Planar Geometries ◽  
High Fluorescence Quantum Yield

By crooking conventional donor segments via suitable steric hindrance, nearly planar geometries, a small singlet–triplet energy splitting and a high fluorescence quantum yield can be realized simultaneously.

Electronic Structure and Optical Response of Electroluminescent Conjugated Polymers

1997 ◽  
Vol 488 ◽  
Author(s):  
J. L. Bredas ◽  
J. Cornil ◽  
D. Beljonne ◽  
D. A. Dos Santos ◽  
Z. Shuaiv ◽  
...  
Keyword(s):  
Experimental Data ◽  
Optical Properties ◽  
Electronic Structure ◽  
Quantum Yield ◽  
Conjugated Polymers ◽  
Quantum Chemical Calculations ◽  
Theoretical Approach ◽  
Quantum Chemical ◽  
Fluorescence Quantum Yield ◽  
Remarkable Agreement

AbstractIn this contribution, we investigate by means of correlated quantum-chemical calculations the influence of intermolecular interactions on the absorption and emission properties of conjugated chains. Various strategies are suggested to avoid a substantial decrease in fluorescence quantum yield in condensed media. Finally, the reliability of our theoretical approach is validated by showing the remarkable agreement obtained between the experimental data and the calculated optical properties of clusters formed by sexithienyl molecules.

Waterproof perovskites: high fluorescence quantum yield and stability from a methylammonium lead bromide/formate mixture in water

2020 ◽  
Vol 8 (17) ◽  
pp. 5873-5881 ◽  
Author(s):  
Yeasin Khan ◽  
Yohan Ahn ◽  
Hyuna Lee ◽  
Jaeki Jeong ◽  
Yun Seop Shin ◽  
...  
Keyword(s):  
Quantum Yield ◽  
Fluorescence Quantum Yield ◽  
Precursor Solution ◽  
Lead Bromide ◽  
High Fluorescence ◽  
High Fluorescence Quantum Yield

We’ve observed intense, water-stable fluorescence from lead formate crystals when they are precipitated from a CH3NH3PbBr3 (MAPbBr3) perovskite precursor solution.

New Synthesis of a Dibenzoperylene Motif Featuring a Doubly Boron–Nitrogen-Doped Bay Region

Synthesis ◽  
2019 ◽  
Vol 51 (22) ◽  
pp. 4147-4152 ◽  
Author(s):  
Michael Fingerle ◽  
Simon Stocker ◽  
Holger F. Bettinger
Keyword(s):  
Quantum Yield ◽  
Fluorescence Quantum Yield ◽  
Blue Fluorescence ◽  
Aniline Derivative ◽  
Nitrogen Doped ◽  
New Synthesis ◽  
Polycyclic Aromatic ◽  
High Fluorescence ◽  
Boron Nitrogen ◽  
High Fluorescence Quantum Yield

A dibenzoperylene motif featuring a doubly boron–nitrogen-doped bay region is accessible from an aniline derivative in six steps in good overall yield. Two n-butyl groups provide the BN-doped polycyclic aromatic hydrocarbon with sufficient solubility in common organic solvents. The synthesis sequence allows installation of a second boron atom next to a weakly nucleophilic nitrogen by using a protected boron species. The title compound shows blue fluorescence, an extremely high fluorescence quantum yield, and an interesting doped bay region.

Photoluminescent Eu-containing polyoxometalate/gemini surfactant hybrid nanoparticles for biological applications

RSC Advances ◽  
2016 ◽  
Vol 6 (11) ◽  
pp. 8601-8604 ◽  
Author(s):  
Yanjun Gong ◽  
Fengqiao Bai ◽  
Zhidan Yu ◽  
Yanhui Bi ◽  
Wenwen Xu ◽  
...  
Keyword(s):  
Quantum Yield ◽  
Fluorescence Quantum Yield ◽  
Gemini Surfactant ◽  
Hybrid Nanoparticles ◽  
Biological Applications ◽  
High Fluorescence ◽  
High Fluorescence Quantum Yield

In water, Eu-containing polyoxometalate/gemini surfactant hybrid spheres with long emission timescale (3.758 ms) and high fluorescence quantum yield (25.17%) behaviors were synthesized.

scholarly journals Shedding light on the effective fluorophore structure of high fluorescence quantum yield carbon nanodots

RSC Advances ◽  
2017 ◽  
Vol 7 (40) ◽  
pp. 24771-24780 ◽  
Author(s):  
W. Wang ◽  
B. Wang ◽  
H. Embrechts ◽  
C. Damm ◽  
A. Cadranel ◽  
...  
Keyword(s):  
Quantum Yield ◽  
Fluorescence Quantum Yield ◽  
Luminescence Properties ◽  
Carbon Nanodots ◽  
Carbon Core ◽  
High Fluorescence ◽  
High Fluorescence Quantum Yield

The unique luminescence properties of carbon nanodots (CDs) originate from pyridone-like fluorophores bound to carbon core.

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