Center for Suprameolcular Optoelectronic Materials and WCU Hybrid Materials Program, Department of Materials Science and Engineering, Seoul National University, 1 Gwanak-ro, Gwanak-gu, Seoul 151-744, Korea.
J Am Chem Soc. 2013 Mar 27;135(12):4757-64. doi: 10.1021/ja312197b. Epub 2013 Mar 13.
We have rationally designed a densely packed 1:1 donor-acceptor (D-A) cocrystal system comprising two isometric distyrylbenzene- and dicyanodistyrylbenzene-based molecules, forming regular one-dimensional mixed stacks. The crystal exhibits strongly red-shifted, bright photoluminescence originating from an intermolecular charge-transfer state. The peculiar electronic situation gives rise to high and ambipolar p-/n-type field-effect mobility up to 6.7 × 10(-3) and 6.7 × 10(-2) cm(2) V(-1) s(-1), respectively, as observed in single-crystalline OFETs prepared via solvent vapor annealing process. The unique combination of favorable electric and optical properties arising from an appropriate design concept of isometric D-A cocrystal has been demonstrated as a promising candidate for next generation (opto-)electronic materials.
我们合理设计了一个密集堆积的 1:1 给体-受体（D-A）共晶体系，它由两个等规二苯乙烯基苯和二氰基二苯乙烯基苯基分子组成，形成规则的一维混合堆积。晶体表现出强烈的红移、明亮的光致发光，源于分子间的电荷转移态。这种特殊的电子状态导致了高的和双极的 p-/n 型场效应迁移率，分别高达 6.7×10(-3)和 6.7×10(-2)cm(2)V(-1)s(-1)，这是在通过溶剂蒸气退火过程制备的单晶 OFET 中观察到的。这种有利的电和光学性质的独特组合源于等规 D-A 共晶的合理设计理念，已被证明是下一代（光电）电子材料的有前途的候选者。
