Photo-induced fluorescence quenching in conjugated polymers dispersed in solid matrices at low concentration

2014 ◽  
Vol 2 (32) ◽  
pp. 6601-6608 ◽  
Author(s):  
Dibakar Sahoo ◽  
Yuxi Tian ◽  
Giuseppe Sforazzini ◽  
Harry L. Anderson ◽  
Ivan G. Scheblykin
Keyword(s):  
Fluorescence Quenching ◽  
Conjugated Polymers ◽  
Fluorescence Yield ◽  
Low Concentration ◽  
Solid Matrices

Quenching by long-living photoproducts limits the fluorescence yield of conjugated polymers.

scholarly journals Towards the Development of a Low-Cost Device for the Detection of Explosives Vapors by Fluorescence Quenching of Conjugated Polymers in Solid Matrices

Sensors ◽  
2017 ◽  
Vol 17 (11) ◽  
pp. 2532 ◽  
Author(s):  
Liliana Martelo ◽  
Tiago das Neves ◽  
João Figueiredo ◽  
Lino Marques ◽  
Alexander Fedorov ◽  
...  
Keyword(s):  
Fluorescence Quenching ◽  
Conjugated Polymers ◽  
Low Cost ◽  
Solid Matrices ◽  
Detection Of Explosives

Fluorescence Quenching in Conjugated Polymers Blended with Reduced Graphitic Oxide

2010 ◽  
Vol 114 (9) ◽  
pp. 4153-4159 ◽  
Author(s):  
Yaobing Wang ◽  
Dharmalingam Kurunthu ◽  
Gary W. Scott ◽  
Christopher J. Bardeen
Keyword(s):  
Fluorescence Quenching ◽  
Conjugated Polymers

Chlorophyll fluorescence quenching by oxygen in plants

1981 ◽  
Vol 59 (2) ◽  
pp. 190-198 ◽  
Author(s):  
William Vidaver ◽  
Konrad Colbow ◽  
Gordon Hall ◽  
Silvia Wessel
Keyword(s):  
Fluorescence Quenching ◽  
Fluorescence Yield ◽  
Reaction Centers ◽  
Variable Fluorescence ◽  
Chlorophyll Fluorescence Quenching ◽  
Sensitive Phase ◽  
Feedback Regulator ◽  
Quenching By Oxygen ◽  
Bean Leaves

Three distinct phases of chlorophyll a fluorescence quenching were observed in green plants by applying O2 pressures of up to 400 atm. These phases are interpreted as indications of three different mechanisms of O2 quenching. The most sensitive phase is dependent on intersystem electron transport. For dark-adapted bean leaves this fluorescence was quenched to half the initial yield with an O2 pressure of about 3 atm. The second mechanism was observed with 3-(3,4)dichlorophenyl)-1,1-dimethylurea (DCMU), namely the quenching of variable fluorescence in leaves, chloroplasts, and green algae cells. This effect of O2 is thought to be closely associated with the photochemical system II reaction centers. Half of the variable fluorescence was quenched with about 40 atm of O2. Finally, the antennae pigments are quenched, as observed by the effect of O2 on the O-level fluorescence yield, when all photochemical system II reaction center traps are presumably open. The O2 pressure required for half-quenching in this case was about 400 atm.The possibility that the quenching of fluorescence occurs with O2 concentrations low enough for endogenous O2 to have an effect on in vivo fluorescence was investigated. We suggest that O2 quenches by competing with photochemical system I for electrons derived from water splitting, and may thus function as a feedback regulator of photosynthesis.

High-Efficiency Fluorescence Quenching of Conjugated Polymers by Proteins

2002 ◽  
Vol 124 (20) ◽  
pp. 5642-5643 ◽  
Author(s):  
Chunhai Fan ◽  
Kevin W. Plaxco ◽  
Alan J. Heeger
Keyword(s):  
Fluorescence Quenching ◽  
Conjugated Polymers ◽  
High Efficiency

EXCITONS ON A 1D PERIODIC CONJUGATED POLYMER CHAIN: TWO ELECTRONIC STRUCTURES OF POLYDIACETYLENE CHAINS

2001 ◽  
Vol 15 (28n30) ◽  
pp. 3593-3596 ◽  
Author(s):  
C. LAPERSONNE-MEYER
Keyword(s):  
Quantum Yield ◽  
Conjugated Polymers ◽  
Electronic Structures ◽  
Conjugated Polymer ◽  
Radiative Lifetime ◽  
Exciton State ◽  
Fluorescence Yield ◽  
Radiative Processes ◽  
Exciton Lifetime ◽  
Fluorescent Quantum Yield

Crystalline polydiacetylenes (PDA) provide a model system for conjugated polymers. Monomer crystals where the polymer content is very low give access to the electronic structure of a 1D straight periodic isolated chain. PDA are known to exist as crystals in two electronic structures, the so-called 'blue' and 'red' phases. In 3BCMU crystals, blue and red chains coexist, so that the electronic properties of both types of chains in the same environment can be compared. In both cases fluorescence originates from the 1 B u exciton state. The blue exciton lifetime is 140 fs, its fluorescence quantum yield is small (10-4) and the relaxation is dominated by non radiative processes via low lying A g states as in polyenes. On the contrary, for red chains the exciton state is highly fluorescent (quantum yield 0.30), its lifetime is 52 ps at 15 K, implying a short radiative lifetime <100 ps. Recent results on the temperature dependence of lifetime and fluorescence yield imply the presence of states, thermally accessible from the exciton state, but non radiant to the ground state. This is consistent with a non planar conformation of the chain.

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