Spectroscopic Characterization of Coumarin-Stained Beads: Quantification of the Number of Fluorophores Per Particle with Solid-State19F-NMR and Measurement of Absolute Fluorescence Quantum Yields

2012 ◽  
Vol 84 (8) ◽  
pp. 3654-3661 ◽  
Author(s):  
Alexandra Huber ◽  
Thomas Behnke ◽  
Christian Würth ◽  
Christian Jaeger ◽  
Ute Resch-Genger
Keyword(s):  
Spectroscopic Characterization ◽  
Quantum Yields ◽  
Fluorescence Quantum Yields ◽  
Absolute Fluorescence

Synthesis and Spectroscopic Characterization of 2-(het)Aryl Perimidine Derivatives with Enhanced Fluorescence Quantum Yields

2019 ◽  
Vol 29 (2) ◽  
pp. 495-504 ◽  
Author(s):  
Marco Lamperti ◽  
Arianna Maria Giani ◽  
Angelo Maspero ◽  
Guglielmo Vesco ◽  
Alessandro Cimino ◽  
...  
Keyword(s):  
Spectroscopic Characterization ◽  
Quantum Yields ◽  
Enhanced Fluorescence ◽  
Fluorescence Quantum Yields

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.

Nature and characterization of the singlet and triplet excited states of the dibenzylideneacetone and di-3-(N-ethylcarbazoylidene)acetone bridging ligands

1992 ◽  
Vol 70 (11) ◽  
pp. 2777-2784 ◽  
Author(s):  
Pierre D. Harvey ◽  
Benoit Daoust
Keyword(s):  
Excited States ◽  
Model Compound ◽  
Energy Transition ◽  
Quantum Yields ◽  
Bridging Ligands ◽  
Fluorescence Quantum Yields ◽  
A Charge ◽  
Triplet Excited States ◽  
First Time

The lowest energy singlet state in di-3-(N-ethylcarbazoylidene)acetone (dNECa), a luminescent model compound at room temperature for dibenzylideneacetone (dba), has been assigned to a charge transfer (CT) state using the medium polarity effect on λmax(F) and the fluorescence polarized spectra of dNECa at 77 K. The dNECa fluorescence quantum yields [Formula: see text] and lifetimes (τF) are solvent sensitive where both [Formula: see text] and τF tend to increase with polarity. The very weak and moderately structured phosphorences have been located for the first time for both dba and dNECa in the 550–800 nm range and are also assigned to a CT state. In this case the CT interactions are less pronounced than λ(0–0)P and τP are much less solvent sensitive. Finally, EHMO type calculations confirm that the CT transition is the lowest energy transition in dba and di-3-(N-methylindoylidene)acetone (a model compound for dNECa), but also suggest that the nπ* state must lie near the CT state in dba.

Photophysical and photochemical properties of fluoroether-substituted zinc(II) and titanium(IV) phthalocyanines

2018 ◽  
Vol 22 (01n03) ◽  
pp. 46-55 ◽  
Author(s):  
İlke Gürol ◽  
Gülay Gümüş ◽  
Deniz Kutlu Tarakci ◽  
Ömer Güngör ◽  
Mahmut Durmuş ◽  
...  
Keyword(s):  
Quantum Yields ◽  
Central Metal Atom ◽  
Spectroscopic Techniques ◽  
Central Metal ◽  
Oxygen Generation ◽  
Fluorescence Quantum Yields ◽  
H Nmr ◽  
Photochemical Properties ◽  
First Time

The synthesis and characterization of novel zinc(II) (1a–4a) and oxo-titanium(IV) (1b–4b) phthalocyanine derivatives bearing 1H,1H-nona?uoro-3,6-dioxaheptan-1-ol groups are described for the first time. These phthalocyanines (1a–4a and 1b–4b) were characterized by elemental analysis and different spectroscopic techniques such as UV-vis, [Formula: see text]H NMR, FTIR and mass. Furthermore, the photophysical (fluorescence quantum yields and lifetimes) and photochemical (singlet oxygen generation and photodegradation) properties of these phthalocyanines were investigated in tetrahydrofuran (THF) solution. The influence of the number of the substituted groups (tetra or octa), position of the substituents (peripheral or non-peripheral) and central metal atom (zinc or titanium) on the photophysical and photochemical properties of these phthalocyanines were evaluated.

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