Synthesis And Properties Of Novel Fused Ring And Crosslinkable Organic Photoelectric Materials

Organic semiconductor materials have attracted much attention from the scientific and commercial fields due to the advantages of flexible display of inorganic materials,ultra-thin,self-luminous,full color display,low driving voltage,fast corresponding speed and low cost.Among the many organic semiconductor materials,fused ring materials are an important component.The extension of the conjugate chains of the ? system leads to more efficient intermolecular overlap and electron coupling,which is beneficial to reduce the band gap and increase the charge mobility.In addition,the industrialization of organic semiconductor materials are mostly small molecular materials,and polymer from the industrialization of some distance.As the polymer material processing process for the solution,making it lower cost,easy to produce large-size products.But there may be layers of miscible defects in the process and affect the performance of the device,we are committed to the development of heated cross-linked materials to reduce the mutual solubility through cross-linking to improve the device effect.Firstly,the DQP of the nitrogen-containing fused ring molecule with central molecular pyrene and pyrazine was synthesized.There were two absorption regions in the UV absorption spectrum.The UV absorption spectra of different concentrations and different solutions showed that the presence of high wavelength absorption region was The central molecular pyrene is associated with aggregates of fused ring molecules at high concentrations.The absorption edge of PDQP-7300 was only 20 nm in the case of DQP,and the absorption edge was almost the same in the film state,and the corresponding optical band The gap is very small,and the general band gap and the monomer band gap is much narrower,we synthesized a series of homopolymer PDQP-5600,PDQP-4200,PDQP-3300,confirmed the bandgap change smaller.Through the literature study and DFT(the density functional theory)calculation,we found that this is because pyrene-containing fused ring molecular orbit is rather special,in the 2,11-position can not significantly improve the degree of conjugation,so the polymer band The gap was not significantly reduced.Molecules with this nature have only reported pyrene.Then,a crosslinkable styrenic group is attached to the silicon fluorene and tetraphenyl silicon units so as to become a crosslinked structure after heating to improve the solvent resistance.And then copolymerized with triphenylamine groups with good hole transport properties to obtain a series of polymers PTST and PSFTV10-50,the optical properties and energy level structure were tested,their maximum emission wavelength in the blue area,is asuitable Blue material.The energy level structure is obtained by cyclic voltammetry curve,PTST is HOMO level is-5.367 eV,The HOMO level of PSFTV10-50 is between-5.291 eV and-5.333 eV,which is more suitable for the energy level of the anode material ITO and is the potential hole transport layer material.