| Abstract
| - Four donor−acceptor functionalized molecular materials with symmetrical structures have been synthesizedand investigated for their use in optoelectronic applications. These π-conjugated molecules consist of oneelectron-donating moiety, for instance, carbazole, triphenylamine, or phenothiazine at the center, and twoacceptors at each side. Introduction of different donor moieties decreases the band gaps allowing a fine-tuning of the optical and electrical properties. These materials exhibit multifunctional properties, such as ared light-emitting behavior and a large photovoltaic effect. Red organic light-emitting diodes were fabricatedin a facile nondoping configuration based on these materials. Saturated red-emission is observed with a CIEof x = 0.64 and y = 0.33, and an external quantum efficiency of 0.19%. In addition, our first observation ofphotovoltaic response in the π-conjugated molecule with donor−acceptor−donor structure is reported. Theorganic single-component photovoltaic cells were fabricated and characterized. Their open-circuit voltageand short-circuit current density are 1.1 V and 0.07 mA cm-2, respectively. The photovoltaic effect correspondsto the absorption characteristics of the compound and depends on the nature of the electron-donating group.
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