642476-85-5Relevant academic research and scientific papers
Supramolecular ordering, thermal behavior, and photophysical, electrochemical, and electroluminescent properties of alkoxy-substituted yne-containing poly(phenylene-vinylene)s
Egbe, Daniel Ayuk Mbi,Carbonnier, Benjamin,Ding, Liming,Muehlbacher, David,Birckner, Eckhard,Pakula, Tadeusz,Karasz, Frank E.,Grummt, Ulrich-Walter
, p. 7451 - 7463 (2007/10/03)
The synthesis and the characterization of defect-free alkoxy-substituted yne-containing poly(phenylene-vinylenes) was investigated. It was found that a degree of 7 was obtained for all the polymers enabling a reliable comparison of their properties as a function of the length and geometry of the grafted side chains. A formation of crystalline superstructures of either spherulitic-like or rodlike morphology was identified as following typical nucleation and growth process for polymer having a symmetric substitution pattern. Results show that the high absorption coefficients and high quantum yields in the solid state combined with enhanced oxidation stability made polymers as potential donor materials in the design of organic solar cells.
Influence of the conjugation pattern on the photophysical properties of alkoxy-substituted PE/PV hybrid polymers
Egbe, Daniel Ayuk Mbi,Bader, Cornelia,Klemm, Elisabeth,Ding, Liming,Karasz, Frank E.,Grummt, Ulrich-Walter,Birckner, Eckhard
, p. 9303 - 9312 (2007/10/03)
Alkoxy-substituted phenylene-ethynylene (PE)/phenylene-vinylene (PV) hybrid polymers of general constitutional structure (-Ar-C≡C-Ar-CH=CH-)n (2), (-Ar-C≡C-Ar-CH=CH-Ar-C≡C-)n (3), and (-Ar-C≡C-Ar-C≡C-Ar-CH=CH-Ar-CH=CH-)n (4) have been synthesized and characterized. Comparisons of their photophysical properties in solution as well as in solid state (photoconductivity, absorption, emission, and electroluminescence) with those of their corresponding alkoxy-substituted poly(phenylene-ethynylene) (1) and poly(phenylene-vinylene) (5) have been carried out. Large octadecyloxy groups were selected as side chains in order to reduce the effect of π-π stacking interaction on the properties of the polymers in the solid state. This resulted in easy detection of photoconductivity and higher fluorescence quantum yields in solid state. The hybrid conjugation pattern in 4 is more favorable for photoconductivity than that in 2. A red shift of the absorption and emission spectra in solution is observed from 1 over 2b, 3, and 4 to 5. LED devices of ITO/PEDOT/polymer/Ca configuration have been fabricated with all compounds, except 2a. The phenylvinylene side groups in 3 not only give rise to a red shift of the solid-state photoluminescence spectrum and electroluminescence spectrum (relative to 2b) but also bring about a decrease of the turn-on voltage and improve the electroluminescence efficiency for more than 100 times.
