Synthesis Of Aggregation-induced Emission Molecules With Tunable Fluorescent Emission

This thesis mainly focused on the development of organic emiting materials and their corresponding tunable photophysical properties for optoelectronic devices. Separately, it contains of the following three sections:First, a review of literature on the recent reported organic solid emission structures based on different emission colors and luminescence parameters and some theories on basic electron process in excited state and aggregstion-induced emissiom (AIE) effect were elucidated.In chapter 2, the study on the AIE active organic compounds with tunable emission properties containing three parts was given. Firstly, it was found that by changing the length of side chains around emiting core structure—DP VP, the fluorescent quantum yield will show corresponding change, the compound with n-hexyl chain exhibiting J aggregation style gave 60.3% quantum yield. By crystal packing analysis and calculation, some structure-property relationship have been speculated. Also, with the attachment of dendron especially larger dendron to the fluorescent core structure——DPVP, the emission increasing was observed because of dendrimer effect. In the end,by introducing donor and acceptor functional groups to the cyan-diphenyl alkene structures, the emission wavelength can effectively be changed through band gap adjusting. Meanwhile the conjugation increasing by double bond enhancement can give red-shift emission. Combining these two methods, we fulfilled the full color visible light emission with similar structures.In Chapter 3, a series of oligo thiophene-based tetrazoles were designed and synthesized for the 405 nm light induced photoclick chemistry. By using this 405 nm laser triggered photoclick reaction, tubulin labeling in live cells was denmonstrated and the red emitting and environment sensitive cycloaddition were obtained through rational modifying the tetrazole structures, which may potentially used in dielectric constant or protein conformation probing in vivo.In brife, a series of organic compounds with AIE property were synthesized. Some approachs have been explored to obtain higher emission efficiency or tunable emission wavelength by chemical modification. Combining with crystal structure analysis and calculation results, some explanations have been exported to understand the relationship between the structure and emission properties especially in the solid state. It may give some theory instructions for future molecular design.