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.

scholarly journals Abnormally aggregation-induced emissions observed from hydrogen- and silyl-substituted siloles

2020 ◽  
Vol 43 (1) ◽  
pp. 125-131
Author(s):  
Zhengang Han ◽  
Kefeng Xie
Keyword(s):  
Hydrogen Atom ◽  
Theoretical Calculations ◽  
Quantum Yields ◽  
Aggregation Induced Emission ◽  
Fluorescence Quantum Yields ◽  
High Fluorescence ◽  
First Time

AbstractSilacyclopentadienes (siloles) are currently of great interest because of their intriguing aggregation-induced emission (AIE) characteristics. In this work, abnormally AIE phenomena were observed from silyl- and hydrogen-substituted siloles respectively. We propose silyl-substituent and hydrogen atom effects to explain this via both experiments and theoretical calculations. It was discovered that trimethylsilyl substituents destroyed the p-interactions with the silole core and resulted in the non-fluorescence. Additionally, 1-chloro-1-H-2,3,4,5-tetraphenylsilole featuring strong fluorescences in both solid and solution states with high fluorescence quantum yields represents a new potential photoelectric material. This work not only reports the silole with strong fluorescences in both solid and solution states for the first time but also contributs to enrich the AIE research of siloles.

scholarly journals Cyanine dyes as ratiometric fluorescence standards for the far-red spectral region

2018 ◽  
Vol 17 (1) ◽  
pp. 99-106 ◽  
Author(s):  
Joshua K. G. Karlsson ◽  
Owen J. Woodford ◽  
Heinz Mustroph ◽  
Anthony Harriman
Keyword(s):  
Spectral Region ◽  
Cyanine Dyes ◽  
Quantum Yields ◽  
Ratiometric Fluorescence ◽  
Spectral Window ◽  
Fluorescence Quantum Yields ◽  
Absolute Fluorescence

Absolute fluorescence quantum yields are reported for a group of commercially available dyes suitable for use as secondary standards across the far-red spectral window.

scholarly journals Rational Design for Multicolor Flavone-Based Fluorophores with Aggregation-Induced Emission Enhancement Characteristics and Applications in Mitochondria-Imaging

Molecules ◽  
2018 ◽  
Vol 23 (9) ◽  
pp. 2290
Author(s):  
Liyan Liu ◽  
Yaohui Lei ◽  
Jianhui Zhang ◽  
Na Li ◽  
Fan Zhang ◽  
...  
Keyword(s):  
Molecular Weight ◽  
Rational Design ◽  
Quantum Yields ◽  
Mixed Solution ◽  
Small Molecular Weight ◽  
Aggregation Induced Emission ◽  
Fluorescence Quantum Yields ◽  
Emission Enhancement ◽  
Low Cytotoxicity ◽  
Further Development

Fluorophores with aggregation-induced emission enhancement (AIEE) properties have attracted more attention in recent years. In order to realise more valuable applications, the different kinds of AIEE molecules are in serious need of further development. Therefore, a novel flavone-based AIEE system derived from restriction of intramolecular rotation (RIR) was designed and synthesized in this work. The results revealed that six of the compounds showed typical AIEE characteristics, with fluorescence emissions from purple, blue, cyan to green, tunable by changing substituent groups. This flavone-based AIEE system has never been reported before. The AIEE characteristics were investigated by optical spectroscopy, fluorescence photographs, scanning electron microscopy (SEM), fluorescence quantum yields (ФF) and fluorescence lifetime in the CH3OH/H2O mixed solution. Moreover, benefiting from the simple structures and small molecular weight, they could permeate cells faster than current high-molecular-weight AIEE molecules. Furthermore, to examine possible biomedical applications, fluorescence imaging in living A549 lung cells and cell viabilities were examined, and the results displayed that these fluorophores showed good cellular uptake and low cytotoxicity within the experimental concentration range. In addition, these AIEE compounds possessed excellent specificity for mitochondrial targeting and mitochondrial morphological change tracking, besides, they displayed superior photostability, which indicated they are potential candidates for mitochondrial imaging.

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