scholarly journals Slow-Injection Growth of Seeded CdSe/CdS Nanorods with Unity Fluorescence Quantum Yield and Complete Shell to Core Energy Transfer

ACS Nano ◽  
2016 ◽  
Vol 10 (3) ◽  
pp. 3295-3301 ◽  
Author(s):  
Igor Coropceanu ◽  
Aurelio Rossinelli ◽  
Justin R. Caram ◽  
Francesca S. Freyria ◽  
Moungi G. Bawendi
Keyword(s):  
Energy Transfer ◽  
Quantum Yield ◽  
Fluorescence Quantum Yield ◽  
Cds Nanorods ◽  
Core Energy ◽  
Slow Injection

Changes of Excitation Spectra of in vivo Chlorophyll Fluorescence during Induction of Photosynthesis

1993 ◽  
Vol 48 (1-2) ◽  
pp. 46-51 ◽  
Author(s):  
Wieslaw I. Gruszecki ◽  
Zbigniew Krupa
Keyword(s):  
Energy Transfer ◽  
Chlorophyll Fluorescence ◽  
Quantum Yield ◽  
Dark Adaptation ◽  
Fluorescence Quantum Yield ◽  
Excitation Energy Transfer ◽  
Reaction Centers ◽  
Excitation Spectra ◽  
In Vivo Chlorophyll Fluorescence

Excitation spectra of chlorophyll fluorescence from intact rye leaves were registered at different steps of the induction of photosynthesis after dark adaptation. Analysis of these spectra indicates that at least two processes related to spectroscopic features are responsible for a fluorescence quenching. The first one, active during the first 100 s of illumination, was interpreted to consists in an overall decrease of the fluorescence quantum yield of antenna pigments and chlorophylls, in particular close to the reaction centers. The second type of a fluorescence decrease (between 100 s and 300 s of illumination) was found to be in large extent related to decrease of the rate of an excitation energy transfer between accessory xanthophyll pigments and chlorophylls emitting fluorescence. This latter molecular mechanism is discussed as being related to violaxanthin availability to de-epoxidation in the xanthophyll cycle.

Synthesis, electrochemistry, spectroscopy and photophysical properties of a series of meso-phenylpyridylporphyrins with one to four pyridyl rings coordinated to [Ru(bipy)2Cl]+ groups

2002 ◽  
Vol 06 (01) ◽  
pp. 33-42 ◽  
Author(s):  
Fábio M. Engelmann ◽  
Pellegrino Losco ◽  
Herbert Winnischofer ◽  
Koiti Araki ◽  
Henrique E. Toma
Keyword(s):  
Energy Transfer ◽  
Quantum Yield ◽  
Electrochemical Behavior ◽  
Fluorescence Quantum Yield ◽  
Photophysical Properties ◽  
Intramolecular Energy Transfer ◽  
Porphyrin Ring ◽  
Transfer Processes ◽  
Redox Pair ◽  
Mlct State

A series of meso-phenylpyridylporphyrins and their respective supermolecular species obtained by the coordination of [ Ru ( bipy )2 Cl ]+ groups to the pyridyl substituents was synthesized and characterized. Their spectroscopic and electrochemical behavior were similar to that observed for the meso-tetra(4-pyridyl)porphyrin derivative, but the redox potential of the Ru (III/II) redox pair was about 70 mV more negative. The porphyrin centered fluorescence quantum yield exhibited a linear decrease as a function of the number of pyridyl substituents on the porphyrin ring. Efficient intramolecular energy transfer processes from the 3 MLCT state of the ruthenium complexes to the porphyrin center were observed at 77K in ethanol glass.

Phosphoreszenzeigenschaften von [2,2](1,4)Naphthalinoparacyclophan und [2,2](1,4)Chrysenoparacyclophan und deren Grundzustandskomplexen mit Silberperchlorat

1985 ◽  
Vol 40 (12) ◽  
pp. 1316-1318 ◽  
Author(s):  
H. Hopf ◽  
M. Zander ◽  
J. Hucker
Keyword(s):  
Energy Transfer ◽  
Quantum Yield ◽  
Ground State ◽  
Fluorescence Quantum Yield ◽  
Specific Property ◽  
General Phenomenon ◽  
Triplet Energy ◽  
Silver Perchlorate ◽  
Transannular Interaction ◽  
Triplet Energy Transfer

Due to the cyclophane structure the energies of the lowest triplet state, phosphorescence lifetimes and phosphorescence/fluorescence quantum yield ratios of [2,2](l,4)naphthalenoparacyclophane (2) and [2,2](1.4)chrysenoparacyclophane (4) differ markedly from the data of 1,4-dimethyl naphthalene and chrysene respectively. By ground state complexation of 2 and 4 with silver Perchlorate the transannular interaction in the cyclophanes is reduced. In contrast to naphthalene. 2 does not effectively quench the benzophenone phosphorescence in benzophenone/ 2 mixed crystals at 77 K. It is shown, however, that this cannot be regarded as a specific property of 2 but rather as an example of the more general phenomenon that steric or stereoelectronic factors can play a considerable role in intermolecular triplet-triplet energy transfer.

Investigations of the Reversible Energy Transfer in Concentrated Dye Solutions

1987 ◽  
Vol 42 (12) ◽  
pp. 1451-1455 ◽  
Author(s):  
C. Bojarski ◽  
G. Żurkowska
Keyword(s):  
Energy Transfer ◽  
Theoretical Model ◽  
Quantum Yield ◽  
Rhodamine B ◽  
Fluorescence Quantum Yield ◽  
Rhodamine 6G ◽  
Experimental Results ◽  
High Concentration ◽  
Concentration Region ◽  
Dye Solutions

In the system rhodamine 6G (donor)/rhodamine B (acceptor) the reverse energy transfer considerably increases the donor fluorescence quantum yield, particularly in the high concentration region. These experimental results confirm a theoretical model with no adjustable parameters.

scholarly journals Efficient light harvesting of a luminescent solar concentrator using excitation energy transfer from an aggregation-induced emitter

2014 ◽  
Vol 16 (46) ◽  
pp. 25358-25363 ◽  
Author(s):  
James L. Banal ◽  
Kenneth P. Ghiggino ◽  
Wallace W. H. Wong
Keyword(s):  
Energy Transfer ◽  
Quantum Yield ◽  
Excitation Energy ◽  
Fluorescence Quantum Yield ◽  
Light Harvesting ◽  
Excitation Energy Transfer ◽  
Solar Concentrator ◽  
Luminescent Solar Concentrator ◽  
High Fluorescence ◽  
High Fluorescence Quantum Yield

Efficient light harvesting in a luminescent solar concentrator has been achieved by using excitation energy transfer from an aggregation-induced emitter to a high fluorescence quantum yield fluorophore.

scholarly journals Synthesis of carbon nitride oligomer as a precursor of melon with improved fluorescence quantum yield

2021 ◽  
Vol 2 (18) ◽  
pp. 6083-6093
Author(s):  
Yuto Miyake ◽  
Goichiro Seo ◽  
Kotaro Matsuhashi ◽  
Noriyuki Takada ◽  
Kaname Kanai
Keyword(s):  
Optical Properties ◽  
Quantum Yield ◽  
Fluorescence Quantum Yield ◽  
Carbon Nitride

Melem tetramer, the newly synthesized carbon nitride compound is composed of oligomers with four melem units, is stable in air, and has improved optical properties compared to melon.

UV-Trained and Metal-Enhanced Fluorescence of Biliverdin and Biliverdin Nanoparticles

Nanoscale ◽  
2021 ◽  
Author(s):  
Parinaz Fathi ◽  
Ayman Roslend ◽  
Kritika Mehta ◽  
Parikshit Moitra ◽  
Kai Zhang ◽  
...  
Keyword(s):  
Quantum Yield ◽  
Fluorescence Quantum Yield ◽  
Biomedical Imaging ◽  
Enhanced Fluorescence ◽  
Metal Enhanced Fluorescence

Increasing the fluorescence quantum yield of fluorophores is of great interest for in vitro and in vivo biomedical imaging applications. At the same time, photobleaching and photodegradation resulting from continuous...

Internal Conversion with 3,5-Dimethyl-4-(methylamino)benzonitrile in Alkane Solvents

2000 ◽  
Vol 214 (11) ◽  
Author(s):  
I. Rückert ◽  
A. Hebecker ◽  
A.B.J. Parusel ◽  
K.A. Zachariasse
Keyword(s):  
Quantum Yield ◽  
Fluorescence Quantum Yield ◽  
Internal Conversion ◽  
Alkane Solvents

With 3,5-dimethyl-4-(methylamino)benzonitrile (MHD) in n-hexane and n-hexadecane at 25°C, relatively small values are obtained for the fluorescence quantum yield Φ

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