Ultrafast Exciton Delocalization, Localization, and Excimer Formation Dynamics in a Highly Defined Perylene Bisimide Quadruple π-Stack

2018 ◽  
Vol 140 (12) ◽  
pp. 4253-4258 ◽  
Author(s):  
Christina Kaufmann ◽  
Woojae Kim ◽  
Agnieszka Nowak-Król ◽  
Yongseok Hong ◽  
Dongho Kim ◽  
...  
Keyword(s):  
Perylene Bisimide ◽  
Formation Dynamics ◽  
Excimer Formation

Intramolecular excimer formation dynamics of bis (9-fluorenyl) methane

1991 ◽  
Vol 176 (5) ◽  
pp. 453-458 ◽  
Author(s):  
Young Boong Chung ◽  
Du-Jeon Jang ◽  
Dongho Kim ◽  
Minyung Lee ◽  
Hyun Sook Kim ◽  
...  
Keyword(s):  
Formation Dynamics ◽  
Intramolecular Excimer ◽  
Excimer Formation

Spectroscopic Demonstration of Exciton Dynamics and Excimer Formation in a Sterically Controlled Perylene Bisimide Dimer Aggregate

2014 ◽  
Vol 5 (20) ◽  
pp. 3601-3607 ◽  
Author(s):  
Minjung Son ◽  
Kyu Hyung Park ◽  
Changzhun Shao ◽  
Frank Würthner ◽  
Dongho Kim
Keyword(s):  
Exciton Dynamics ◽  
Perylene Bisimide ◽  
Excimer Formation

Real time observation of the excimer formation dynamics of a gas phase benzene dimer by picosecond pump–probe spectroscopy

2015 ◽  
Vol 17 (39) ◽  
pp. 25989-25997 ◽  
Author(s):  
Mitsuhiko Miyazaki ◽  
Masaaki Fujii
Keyword(s):  
Gas Phase ◽  
Vibrational Energy ◽  
Energy Redistribution ◽  
Pump Probe ◽  
Formation Dynamics ◽  
Benzene Dimer ◽  
Excimer Formation ◽  
Time Observation ◽  
Probe Spectroscopy ◽  
Real Time Observation

Photoexcitation of a T-shaped benzene dimer provides a sandwiched excimer in 10 ps accompanying a 1000 times faster intracluster vibrational energy redistribution rate than that of the benzene monomer.

Photoinduced electron transfer (PET) versus excimer formation in supramolecular p/n-heterojunctions of perylene bisimide dyes and implications for organic photovoltaics

2015 ◽  
Vol 185 ◽  
pp. 507-527 ◽  
Author(s):  
Agnieszka Nowak-Król ◽  
Benjamin Fimmel ◽  
Minjung Son ◽  
Dongho Kim ◽  
Frank Würthner
Keyword(s):  
Electron Transfer ◽  
Organic Solar Cells ◽  
Photoinduced Electron Transfer ◽  
Transient Absorption ◽  
Model Systems ◽  
Transient Absorption Spectroscopy ◽  
Time Resolved ◽  
Perylene Bisimide ◽  
Excimer Formation ◽  
Molecular Semiconductor

Foldamer systems comprised of two perylene bisimide (PBI) dyes attached to the conjugated backbones of 1,2-bis(phenylethynyl)benzene and phenylethynyl-bis(phenylene)indane, respectively, were synthesized and investigated with regard to their solvent-dependent properties. UV/Vis absorption and steady-state fluorescence spectra show that both foldamers exist predominantly in a folded H-aggregated state consisting of π–π-stacked PBIs in THF and in more random conformations with weaker excitonic coupling between the PBIs in chloroform. Time-resolved fluorescence spectroscopy and transient absorption spectroscopy reveal entirely different relaxation pathways for the photoexcited molecules in the given solvents, i.e. photoinduced electron transfer leading to charge separated states for the open conformations (in chloroform) and relaxation into excimer states with red-shifted emission for the stacked conformations (in THF). Supported by redox data from cyclic voltammetry and Rehm–Weller analysis we could relate the processes occurring in these solution-phase model systems to the elementary processes in organic solar cells. Accordingly, only if relaxation pathways such as excimer formation are strictly avoided in molecular semiconductor materials, excitons may diffuse over larger distances to the heterojunction interface and produce photocurrent via the formation of electron/hole pairs by photoinduced electron transfer.

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