Polymer Dispersed Discotics:  Structure, Dynamics, and Optoelectronic Properties

Abstract

Discotic liquid crystalline materials characterized by the spontaneous formation of columns within the fluid phase display a set of interesting optoelectronic properties directly related to the state of order. The dispersion of such columnar discotics in solid polymer matrices results in geometric confinement effects controlling both the structure of the mesophase and dynamical properties related to transport properties. The confinement causes a reduction of the longitudinal and the transverse spatial correlation lengths which, in turn, gives rise to strong modifications of the absorption and emission properties as well as electronic transport processes.

Liquid Crystals for Charge Transport, Luminescence, and Photonics

“…[38] This property is retained with an improved surface morphology when they are dispersed in a polymer matrix. [79] Fluorene oligomers, for example F(MB)10F(EH) 2 , see above, which form a nematic glassy phases with a high T g , and a very high clearing point have also recently been developed. [68] crosslink chromaphore spacer spacer Fig.…”

Linking morphology and performance of organic solar cells based on decacyclene triimide acceptors

“…Blending a columnar discotic liquid crystalline material with an amorphous polymer can lead to geometric connement that alters the spatial correlation lengths of the columnar structures, hence changing their optical and electronic transport properties. 30 Although blends with amorphous polymers reveal interesting physics, OPVs require these discotic materials to be mixed with semiconducting polymers or small molecules and maintain proper electrical function. This has been shown for a hexabenzocoronene based discotic liquid crystal that selfassembles into vertical stacks when blended with a perylene dye and exhibits a photovoltaic response with a power efficiency maximum of 1.95% and an external quantum efficiency over 34% at 490 nm.…”

Poly(p-xylylene) Nanotubes by Coating and Removal of Ultrathin Polymer Template Fibers

“…However, the controlled preparation of cylindrically shaped polymer and composite tubes with inner diameters <100 nm is still a challenge. This challenge might be of particular interest for research on materials confinement effects, [10][11][12] which become more effective as dimensions become smaller.…”