Synthesis And Properties Of Multi-armed Structure Of Fluorene-based Blue Materials

High-performance organic blue light-emitting materials is the difficulty in the field of organic electronics for their commercial motives. There are still many problems in the field of blue light-emitting materials, such as color purity is low, the poor spectral stability, and electroluminescence spectra of short life. These problems can be achieved by changes in molecular structure. For example, reduce the generation of9-fluorenone defects, increased solubility, increased thermal stability, and adjust the material emission wavelength to resolve. This paper mainly works around these areas.Summarized in a brief review of the blue light-emitting materials research course and nuclear and branch arm structural unit commonly used in the composition of the stars emitting materials.In these reasons of rigid structure, wide bandgap, easy modification, dark blue fluorescence emission, fluorene was extensive researched. In this thesis, mainly through the introduction of the phenyl group in fluorene to pyrene and truxene to regulate the performance of these materials. The six-armed monodisperse macromolecules were fully characterized by NMR, MALDI-TOF MS, and GPC, et al. The results revealed that they were of a high purity and monodispersity and an absence of precursors and partially substituted by products. The maximum brightness of T2divice is2265cd·m-2and the maximum current efficiency is1.59cd·A-1with the structure of [ITO/PEDOT:PSS (AI4083,200A)/emitting layer/CsF (20A)/A1]. The performance of T1, T2has a higher device lifetime than the linear polymer PPF. Cr6-1emission peak in the fluorescence spectra is410nm with good solution and good film forming property which CIE coordinates is (0.16,0.08).Studies have shown that the synthesis of series star shaped materials in this thesis has good solubility and film-forming ability and thermodynamic stability. These are good blue light emitting materials.