scholarly journals Excimer Formation of Perylene Bisimide Dyes within Stacking-Restrained Folda-Dimers: Insight into Anomalous Temperature Responsive Dual Fluorescence

CCS Chemistry ◽  
2021 ◽  
pp. 1-21
Author(s):  
Congdi Shang ◽  
Gang Wang ◽  
Yu-Chen Wei ◽  
Qingwei Jiang ◽  
Ke Liu ◽  
...  
Keyword(s):  
Dual Fluorescence ◽  
Anomalous Temperature ◽  
Perylene Bisimide ◽  
Temperature Responsive ◽  
Excimer Formation ◽  
Insight Into

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

Discrete π-Stacks of Perylene Bisimide Dyes within Folda-Dimers: Insight into Long- and Short-Range Exciton Coupling

2018 ◽  
Vol 140 (31) ◽  
pp. 9986-9995 ◽  
Author(s):  
Christina Kaufmann ◽  
David Bialas ◽  
Matthias Stolte ◽  
Frank Würthner
Keyword(s):  
Short Range ◽  
Perylene Bisimide ◽  
Exciton Coupling ◽  
Insight Into

scholarly journals Insight into the self-assembly of water-soluble perylene bisimide derivatives through a combined computational and experimental approach

Nanoscale ◽  
2019 ◽  
Vol 11 (34) ◽  
pp. 15917-15928 ◽  
Author(s):  
Emily R. Draper ◽  
Liam Wilbraham ◽  
Dave J. Adams ◽  
Matthew Wallace ◽  
Ralf Schweins ◽  
...  
Keyword(s):  
Amino Acid ◽  
Self Assembly ◽  
Experimental Approach ◽  
Water Soluble ◽  
The Self ◽  
Experimental Techniques ◽  
Perylene Bisimide ◽  
Perylene Bisimides ◽  
Insight Into

We use a combination of computational and experimental techniques to study the self-assembly and gelation of amino-acid functionalised water-soluble perylene bisimides.

A new viewpoint to the mechanism for the effects of melt overheating on solidification of Pb-Bi alloys

2009 ◽  
Vol 24 (7) ◽  
pp. 2378-2384 ◽  
Author(s):  
Fang-Qiu Zu ◽  
Jie Chen ◽  
Xian-Fen Li ◽  
Li-Na Mao ◽  
Yong-Chi Liu
Keyword(s):  
Electrical Resistivity ◽  
Liquid Structure ◽  
Structure Change ◽  
Anomalous Temperature Dependence ◽  
Solidification Behavior ◽  
Anomalous Temperature ◽  
Thermodynamics And Kinetics ◽  
Kinetics Of ◽  
Insight Into ◽  
Kinetics Of Crystal Growth

The effects of melt overheating treatment on solidification of Pb-Bi alloys were studied from the viewpoint of liquid-liquid structure change (LLSC). Anomalous temperature dependence of internal friction, electrical resistivity, and entropy of liquid Pb-Bi alloys suggested that discontinuous LLSC occurred within about 520–740 °C, based on which the solidification experiments were carried out with different states of Pb-Bi melts. The results revealed that the LLSC affected the solidification behavior and microstructures significantly, that is, the enlarged undercooling, increased nucleation rate, and refined and improved morphologies were brought about when solidifying from the melt experienced LLSC. It is assumed that the LLSC changed the energy constitution of the melt system, and further affected the effective partition coefficient, thermodynamics, and kinetics of crystal growth, then finally altered the solidification behavior and solidified microstructures. This work brings a novel insight into the effect of melt overheating treatment on solidification, by which it could be more effective to manipulate melts.

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

scholarly journals Insight into the mechanism and outcoupling enhancement of excimer-associated white light generation

2016 ◽  
Vol 7 (6) ◽  
pp. 3556-3563 ◽  
Author(s):  
Ying-Hsiao Chen ◽  
Kuo-Chun Tang ◽  
Yi-Ting Chen ◽  
Jiun-Yi Shen ◽  
Yu-Sin Wu ◽  
...  
Keyword(s):  
White Light ◽  
High Performance ◽  
Single Component ◽  
White Light Generation ◽  
Light Generation ◽  
Excimer Formation ◽  
Fundamental Insight ◽  
Insight Into

Fundamental insight into excimer formation of Cz9PhAn, achieving a single-component, high-performance WOLED.

Excimer formation and dual fluorescence emission of a hydroxyquinoline based macrocyclic tripod: existence of intra and intermolecular π-stacking

RSC Advances ◽  
2016 ◽  
Vol 6 (109) ◽  
pp. 108017-108027 ◽  
Author(s):  
Rohini Rohini ◽  
Minati Baral ◽  
B. K. Kanungo
Keyword(s):  
Excited State ◽  
Fluorescence Emission ◽  
Dual Fluorescence ◽  
Π Stacking ◽  
Excimer Formation ◽  
Ph Dependent

The excited state reaction of 1,4,7-tris-(5-methylene-8-hydroxyquinoline)-1,4,7-triazacyclononane was studied in solution. The intramolecular-π-stacked tripod shows pH-dependent eximer emission and dual fluorescence due to intermolecular π-stacking.

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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