Design,synthesis And Luminescent Properties Of Carbazole Compounds

As a core part of the OLED,Organic electroluminescent materials are one of the key factors to determine the device performance.As an important class of organic small molecule electroluminescent materials,carbazole and fluorene derivatives have attracted large attention because of their excellent properties,and have great potential application value.In this dissertation,we mainly synthesized which contain boronic acid group-N-phenyl carbazole and fluorene compounds,and their luminescent properties,electrochemical properties and thermal stability were studied systematically.Based on the related literatures,we took boronic acid group-N-phenyl carbazole and 3-hydroxy-2,3-dimethylbutan-2-yl hydrogen(9,9-dioctyl-9H-fluoren-2-yl)boronate as donor,and different types of the receptor units were selected to perform a chemical modification,then a series of novel compounds were synthesized with optimized its reaction condition On the basis of optimized synthetic,the target compounds were characterized and confirmed by NMR.We studied the luminescent properties of the synthesized compounds via UV-vis absorption spectra,fluorescence emission spectra and solvent effects.By determining their UV-vis and fluorescence emission spectra in different solvents,the effect of molecular structure,solvent polarity on spectral characteristics were explored,and their fluorescence quantum yields were also determined by reference method.The results showed that their absorption and emission spectra have a degree of red-shift along with increasing solvent polarity and conjugation of compounds,and they possessed strong fluorescence emission,high fluorescence quantum yield and could be used as electroluminescent materials.In addition,We also studied electrochemical properties,quantum chemistry calculations and thermal stability of the target compounds,and reflected systematically the performance characteristics of target compounds as organic electroluminescent materials.The results showed that they possessed excellent electrochemical performance,high thermal stability,excellent luminescent properties,and could be an excellent luminescent materials.