Chu Xiaotong, Lu Zhuoqun, Tang Baolei, Liu Bin, Ye Kaiqi, Zhang Hongyu
State Key Laboratory of Supramolecular Structure and Materials, College of Chemistry, Jilin University, 130012 Changchun, China.
J Phys Chem Lett. 2020 Jul 16;11(14):5433-5438. doi: 10.1021/acs.jpclett.0c01545. Epub 2020 Jun 25.
Recently, organic crystals with mechanical flexibility have been emerging as a hot research topic due to their great potentials in flexible optoelectronics. However, organic crystals exhibiting elastic bending or plastic bending are relatively rare. In this study, we proposed a strategy to improve the probability of crystal flexibility as well as to regulate the mechanical properties by controlling polymorphism. Three different emissive organic polymorphs Cry-, Cry-, and Cry- with elastic, plastic, and brittle natures, respectively, were obtained by fine-tuning crystallization conditions of a diaryl β-diketone compound. Cry- was found to transduce light and amplify the self-waveguided emission efficiently along the crystal body in the elastically bent state, demonstrating its multifunctional applications in flexible optical devices. This study is of great scientific significance not only to engineer mechanical compliance of organic crystals but also to highlight the utility of "crystal flexibility".
近年来，具有机械柔韧性的有机晶体因其在柔性光电子学中的巨大潜力而成为一个热门研究课题。然而，表现出弹性弯曲或塑性弯曲的有机晶体相对较少。在本研究中，我们提出了一种策略，通过控制多晶型来提高晶体柔韧性的概率并调节机械性能。通过微调一种二芳基β-二酮化合物的结晶条件，分别获得了具有弹性、塑性和脆性性质的三种不同发光有机多晶型物Cry-、Cry-和Cry-。发现Cry-在弹性弯曲状态下能够有效地传导光并沿晶体本体放大自波导发射，证明了其在柔性光学器件中的多功能应用。这项研究不仅对设计有机晶体的机械柔顺性具有重要的科学意义，而且突出了“晶体柔韧性”的实用性。
