title: Novel electroactive and photoactive molecular materials based on conjugated donor-acceptor structures for optoelectronic device applications.
abstract: Four donor-acceptor functionalized molecular materials with symmetrical structures have been synthesized and investigated for their use in optoelectronic applications. These pi-conjugated molecules consist of one electron-donating moiety, for instance, carbazole, triphenylamine, or phenothiazine at the center, and two acceptors 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 a red light-emitting behavior and a large photovoltaic effect. Red organic light-emitting diodes were fabricated in a facile nondoping configuration based on these materials. Saturated red-emission is observed with a CIE of x = 0.64 and y = 0.33, and an external quantum efficiency of 0.19%. In addition, our first observation of photovoltaic response in the pi-conjugated molecule with donor-acceptor-donor structure is reported. The organic single-component photovoltaic cells were fabricated and characterized. Their open-circuit voltage and short-circuit current density are 1.1 V and 0.07 mA cm(-2), respectively. The photovoltaic effect corresponds to the absorption characteristics of the compound and depends on the nature of the electron-donating group.
authors.affiliation: Key Laboratory of Organic Solids, Institute of Chemistry, Chinese Academy of Sciences, Beijing 100080, PR China.
authors.forename: Xiaobo
authors.initials: X
authors.lastname: Sun
authors.forename: Yunqi
authors.initials: Y
authors.lastname: Liu
authors.forename: Xinjun
authors.initials: X
authors.lastname: Xu
authors.forename: Chunhe
authors.initials: C
authors.lastname: Yang
authors.forename: Gui
authors.initials: G
authors.lastname: Yu
authors.forename: Shiyan
authors.initials: S
authors.lastname: Chen
authors.forename: Zhehui
authors.initials: Z
authors.lastname: Zhao
authors.forename: Wenfeng
authors.initials: W
authors.lastname: Qiu
authors.forename: Yongfang
authors.initials: Y
authors.lastname: Li
authors.forename: Daoben
authors.initials: D
authors.lastname: Zhu