Self-assembly Preparation And Optoelectronic Properties Of Organic Micro/Nanomaterials

Owing to the unique opto-electronic properties and potential applications, the organic nanomaterials have attracted ever-increasing attention in recent years. Combined with efficient synthetic route, it has been an important issue for tuning the aggregate behaviors of organic small molecules and obtaining the final organic materials with specific optoelectronic properties.In this thesis, we utilized the self-assembly method to prepare a series of organic materials with specific morphologies, and then deeply investigated their optoelectric properties. In the experimental process, the composition of organic nanostructures has been extended from single component to charge transfer(CT) complex multicomponents. The strategies may fortify our understanding of the complex organic nanomaterials consist of two or more components and provide a substitue to achieve multiple functions in single nanomaterials.1. Two-dimensional(2D) hexagonal microsheets of 8-hydroxyquinoline zinc(Znq2) were synthesized successfully via a mixed-solvent-induced self-assembly method. The hexagonal Znq2 microsheets with high-quality single-crystalline structures exhibit outstanding optical waveguiding behaviors. Moreover, the microsheets of Znq2 can be regarded as planar optical microcavities that the crystal edges can confine the emitted photons by reflection. In addition, the Znq2 microsheets have remarkable stimuli-responsive florescence and exhibit good repeatability. We expect the Znq2 microsheets have the potation to be a novel kind of photonic materials using in noble smart devices such as chemical sensor and active photonic devices.2. A simple self-assembly method was developed to construct a series of crystalline mixed CT complex microtubes of(anthracene)x(phenanthrene)1-x(TCNB), with 0 x 1. The CT interactions and structural compatibility of phenanthrene-TCNB and anthracene-TCNB facilitate the formation of(anthracene)x(phenanthrene)1-x(TCNB) microtubes over the whole composition range, which provides a promising platform to investigate energy transfer and structural relationship between two different luminescent CT complexes. In principle, this process can also be extended to the fabrication of more mixed molecular cocrystals comprising two and more diverse organic materials by rational design and selection of organic molecules. Specifically, realization of mixed molecular cocrystals provides a simple design principle for integration of different organic semiconductor materials with similar structural properties, which may have potential applications in optoelectronic devices area, such as organic solar cells(OSCs) and organic light-emitting field effect transistors(OLEFETs).