Morphology and photophysical properties of phenyleneethynylene oligomer

In situ UV-visible absorption during spin-coating of organic semiconductors: a new probe for organic electronics and photovoltaics

“…In the eld of solution-processed organic electronics, UV-vis absorption has been used for decades to measure the solution and solid state optical properties of organic semiconductors. [1][2][3] The band gap and vibronic progressions of the conjugated materials strongly correlate to the presence of J and H photophysical aggregates, which thus offers a way to relate the solution and solid states of the organic semiconductor to the performance and efficiency of organic light emitting diodes (OLED), organic thin lm transistors (OTFT) and organic photovoltaic (OPV) devices. [4][5][6][7] In the case of conjugated polymers, such as the commonly used poly(3-hexylthiophene) (P3HT), recent efforts at modelling the absorption spectrum now makes it possible to use the simple UV-vis absorption spectra of a P3HT thin lm, in order to quantify the fraction of ordered photophysical aggregates (both J and H), as well as infer the degree of backbone planarity by virtue of the excitonic bandwidth along the polymer backbone.…”

Tunable solid state fluorescence behavior of a methoxy substituted oligo(phenyleneethynylene): influence of cooling rate and surface crystallization

“…Otherwise, OPE molecules with small substituents as such exhibit conformally notorious behavior due to a low rotational barrier (<1 kcal mol À1 ) between the acetylene linkage and the phenyl rings present in the structure. Zhou et al 27 have reported the nature of intermolecular interactions in OPE molecules by studying the morphology and photophysical properties of an OPE pentamer by thermal annealing of the solution processed films.…”

Probing the Intrachain and Interchain Effects on the Fluorescence Behavior of Pentiptycene-Derived Oligo(p-phenyleneethynylene)s

“…The great potential of π-conjugated oligomers and polymers for application in optoelectronic devices has stimulated a great amount of theoretical , and experimental − research on their solid-state photophysics. It is recognized that the luminescence properties of these π-systems in thin solid films are generally dictated by the low-energy sites due to efficient intrachain and interchain exciton migrations.…”