Excited state dynamics of organic semi-conducting materials

2015 ◽  
Vol 177 ◽  
pp. 111-119 ◽  
Author(s):  
Kenneth P. Ghiggino ◽  
Andrew J. Tilley ◽  
Benjamin Robotham ◽  
Jonathan M. White
Keyword(s):  
Excited State ◽  
Conjugated Polymer ◽  
Variable Temperature ◽  
Emission Spectra ◽  
Time Resolved ◽  
Absorption And Emission ◽  
X Ray ◽  
X Ray Crystallography ◽  
Conducting Materials ◽  
Absorption And Emission Spectroscopy

Time-resolved absorption and emission spectroscopy has been applied to investigate the dynamics of excited state processes in oligomer models for semi-conducting organic materials. Following the photo-excitation of a pentamer oligomer that is a model for the conjugated polymer MEH-PPV, an ultrafast component of a few picoseconds is observed for the decay of the initially formed transient species. Variable temperature absorption and emission spectra combined with X-ray crystallography and calculations support the assignment of this rapid relaxation process to an excited state conformational rearrangement from non-planar to more planar molecular configurations. The implications of the results for the overall photophysics of conjugated polymers are considered.

A flow cell suitable for time-resolved X-ray crystallography by the Laue method

1997 ◽  
Vol 30 (5) ◽  
pp. 555-556 ◽  
Author(s):  
G. Kurisu ◽  
A. Sugimoto ◽  
Y. Kai ◽  
S. Harada
Keyword(s):  
Flow Cell ◽  
Time Resolved ◽  
X Ray ◽  
X Ray Crystallography ◽  
Laue Method

Photoactive amphiphiles for the assembly of supramolecular architectures

2015 ◽  
Vol 185 ◽  
pp. 471-479 ◽  
Author(s):  
B. P. Jarman ◽  
F. Cucinotta
Keyword(s):  
Visible Spectrum ◽  
Solid Materials ◽  
Visible Absorption ◽  
Optical Components ◽  
Absorption And Emission ◽  
X Ray ◽  
Supramolecular Architectures ◽  
Uv Visible ◽  
Absorption And Emission Spectroscopy ◽  
Molecular Organisation

The presented study reports the use of photoactive templating structures for the design of porous frameworks with built-in optical functionalities. The materials have been synthesised and characterised using powder X-ray diffractometry, UV-visible absorption and emission spectroscopy. The latter shows that, by varying the relative amount of an amphiphilic chromophore in the micellar templates, it is possible to tune the light absorption and emission properties over the visible spectrum, by means of controlling the molecular organisation and the excitonic coupling of aggregated species. This enables versatile solid materials that can be used as optical components for light-harvesting and converting systems to be obtained .

Time-Resolved X-ray Scattering of an Electronically Excited State in Solution. Structure of the3A2uState of Tetrakis-μ-pyrophosphitodiplatinate(II)

2009 ◽  
Vol 131 (2) ◽  
pp. 502-508 ◽  
Author(s):  
Morten Christensen ◽  
Kristoffer Haldrup ◽  
Klaus Bechgaard ◽  
Robert Feidenhans’l ◽  
Qingyu Kong ◽  
...  
Keyword(s):  
Excited State ◽  
Solution Structure ◽  
Time Resolved ◽  
X Ray ◽  
Electronically Excited State ◽  
X Ray Scattering ◽  
Electronically Excited ◽  
Ray Scattering
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