Design And Synthesis Of Heterofluorene-based Molecules And Their Optoelectronic Properties

In the field of organic electronics, the high efficiency of the devices is always the desire of the researchers, and now the research of the luminescent materials has been transformed from the pursuit of high efficiency to diversity. It is difficult to meet the requirement of researchers with the materials made of C and H elements by changing the structure of the organic light-emitting materials in the early age. The introduction of heteroatoms provides the possibility for light emitting material to obtain various photoelectric properties, such as heterofluorene materials. Because of the special chemical structure, which brings special photophysical properties, such as gap, good thermal and spectral stability, high luminescence and quantum efficiency, good mobility of the carriers, the heterofluorene materials have many applications in the field of organic electronics. Looking for heterofluorene luminescent material with a variety of optoelectronic properties is still worth further research in the field.This paper aims at further research on optical properties and applications of heterofluorenes materials. Designed and synthesized a series heterofluorene small molecular materials with the specific structure. Using the structure characterization, simulation calculation, light physical performance tests and related device characterization, fluorescent molecular materials are studied on the relationship between the molecular structure and material properties. The details are as followed:1) A series of phenyl modified phosphafluorene fluorescent molecular optoelectronic functional materials were successfully designed and synthesized. The basic physical properties of the materials were studied by experiments and quantum chemistry calculations, and the application of this kind of material as the blue light material in organic light emitting devices was explored. It is found that this kind of material has good electron injection ability, high fluorescence quantum efficiency, good stability and solubility, and is so good as blue fluorescent material.2) A series of pyrene capped heterofluorenes small molecule photoelectric functional materials were successfully designed and synthesized. According to the theoretical calculation, we studied photophysical properties of different heterofluorene core unit in detail, and explored the material as blue luminescent materials prospects in OLED. It is found that this kind of material has a very high fluorescence quantum efficiency in solution, and the energy level of this kind of material has a good matching degree, which is very suitable for the injection of holes and electrons.3) With the designed and optimized synthetic route, starting from the linear structure of benzene and using transition metal catalyzed method, the fused ring silicon bridging fluorene material was successfully synthesized in high yield. With the combination of theory and experiment, the fused ring silicon bridging fluorene were researched on the basic photophysical properties. This research is laid a certain reference resources for related research of multiple fused ring silafluorene.