scholarly journals Excimers in Multichromophoric Assemblies: Boon or Bane?

2021 ◽  
Author(s):  
Debansu Chaudhuri
Keyword(s):  
Excited State ◽  
Fluorescence Quenching ◽  
Organic Semiconductors ◽  
Light Emission ◽  
Singlet Fission ◽  
Circularly Polarized ◽  
Exciton Migration ◽  
Organic Systems ◽  
Polarized Emission ◽  
Recent Developments

Exciton dynamics in organic semiconductors is a subject of great significance from the standpoint of light emission, as well as light harvesting. As transient excited state species, excimers are expected to play a significant role in the dynamics and the fate of the excited state. Till recently, the discourse on excimers in organic systems revolved around their role in aggregation induced fluorescence quenching, or utilizing their characteristic red-shifted emission to report local interactions. But in the last decade, research in the area of organic multichromophoric systems has brought the spotlight back on this fascinating species. This review focuses on recent developments that highlight the importance of excimers in various processes involving multichromophoric systems, such as circularly polarized emission, exciton migration and singlet fission (SF). The review also attempts to address the question of whether excimers are useful or detrimental to various photophysical and photochemical processes of importance.

scholarly journals Modulation of circularly polarized luminescence through excited-state symmetry breaking and interbranched exciton coupling in helical push–pull organic systems

2020 ◽  
Vol 11 (2) ◽  
pp. 567-576 ◽  
Author(s):  
Kais Dhbaibi ◽  
Ludovic Favereau ◽  
Monika Srebro-Hooper ◽  
Cassandre Quinton ◽  
Nicolas Vanthuyne ◽  
...  
Keyword(s):  
Excited State ◽  
Symmetry Breaking ◽  
Luminescence Intensity ◽  
Solvent Polarity ◽  
Circularly Polarized ◽  
Polarity Effect ◽  
Exciton Coupling ◽  
Organic Systems ◽  
Circularly Polarized Luminescence ◽  
Polarized Luminescence

Solvent polarity effect on circularly polarized luminescence intensity was assessed in helical push–pull organic systems through excited-state symmetry breaking and interbranched exciton coupling.

Theory of Circularly Polarized Light Emission from Chiral Nematic Liquid Crystalline Films

1996 ◽  
Vol 425 ◽  
Author(s):  
H. Shi ◽  
S. H. Chen
Keyword(s):  
Experimental Data ◽  
Film Thickness ◽  
Liquid Crystalline ◽  
Light Emission ◽  
Polarized Light ◽  
Circularly Polarized Light ◽  
Circularly Polarized ◽  
Chiral Nematic ◽  
Polarized Emission ◽  
Crystalline Films

AbstractChiral nematic liquid crystalline films with fluorescent chromophores are capable of circularly polarized emission. A theory is presented in which the effects of anisotropic absorption and film thickness are accounted for. The predicted dissymmetry factor is compared with experimental data reported by Stegemeyer et al. and with the theory for the two limiting cases treated by Pollmann et al.

Renilla Bioluminescence: A Morphologic Approach to the Location of Photocytes

1974 ◽  
Vol 32 ◽  
pp. 208-209
Author(s):  
Ben O. Spurlock ◽  
Milton J. Cormier
Keyword(s):  
Excited State ◽  
Ground State ◽  
Molecular Basis ◽  
Light Emission ◽  
Chemical Basis ◽  
Electronic Excited State ◽  
Colonial Form ◽  
The Common ◽  
Eighteenth And Nineteenth Centuries ◽  
Catalyzed Oxidation

The phenomenon of bioluminescence has fascinated layman and scientist alike for many centuries. During the eighteenth and nineteenth centuries a number of observations were reported on the physiology of bioluminescence in Renilla, the common sea pansy. More recently biochemists have directed their attention to the molecular basis of luminosity in this colonial form. These studies have centered primarily on defining the chemical basis for bioluminescence and its control. It is now established that bioluminescence in Renilla arises due to the luciferase-catalyzed oxidation of luciferin. This results in the creation of a product (oxyluciferin) in an electronic excited state. The transition of oxyluciferin from its excited state to the ground state leads to light emission.

The role of conformational heterogeneity in the excited state dynamics of linked diketopyrrolopyrrole dimers

2021 ◽  
Author(s):  
Siobhan Bradley ◽  
Ming Chi ◽  
Jonathan White ◽  
Christopher R. Hall ◽  
Lars Goerigk ◽  
...  
Keyword(s):  
Excited State ◽  
Conformational Heterogeneity ◽  
Singlet Fission ◽  
Excited State Dynamics

Diketopyrrolopyrrole (DPP) derivatives have been proposed for both singlet fission and energy upconversion as they meet the energetic requirements and exhibit superior photostability compared to many other chromophores. In this...

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