Synthesis And Photoelectric Properties Of PPV Conjugated Polymers Based On Spiro-Fluoreneoxanthracene(SFX)

With the development of digital multimedia,as the terminal of various information products,display has been widely concerned.In particular,organic light-emitting diodes(OLEDs)have become the focus of scientific research.Compared with traditional inorganic semiconductors,organic light-emitting diodes(OLEDs)have lower processing costs.As the core of organic electroluminescent devices,organic luminescent materials mainly include PPV,polyalkylfluorene,polythiophene,spiro compound and metal coordination and so on.Among them,PPV is a kind of conjugated polymer material,which was first studied and used in electroluminescent devices.The optoelectronic properties of the target products can be adjusted by modifying the side chain and the main chain.The spiro aromatic compounds have large conjugate system and unique spiro conjugation effect better rigid coplanar and high glass transition temperature.It is easy to fabricate electroluminescent devices with good thermal stability.At present,organic polymer luminescent materials have attracted more and more attention.This paper simply introduces the basic principle of organic electroluminescent and research progress of commonly used luminescent materials,and the PPV materials and SFX materials are discussed in detail.At the same time,a series of PPV conjugated polymer materials in D-A style with SFX as receptor and alkoxy benzene/alkyl fluorene as donor were also designed and synthesized.And we make a good study on their chemical and physical properties.Specific content is as follows:1.The SFX with different steric resistance structures were synthesized by "one pot method" using 2-dibromofluorenone and fluorenone as raw materials.2-methoxy-5-octoxy-1,4-divinylbenzene monomer was synthesized from 4-methoxy phenol by a series of chemical methods.Furthermore,the Heck coupling reaction was used to prepare the PPV conjugated polymer with alkoxy benzene and SFX as donor and acceptor units,respectly.The results showed that the polymer had good solubility,thermal stability and spectral stability.And it can be used to fabricate electroluminescent devices.2.Using fluorene as raw material,a series of chemical methods were used to synthesize the monomer of 2,7-divinyl-9,9-dioctylfluorene.Furthermore,the Heck coupling reaction was used to prepare the PPV conjugated polymer with alkyl fluorene and SFX as donor and acceptor units,respectly.The results showed that the polymer had good solubility,thermal stability and spectral stability.And it also can be used to fabricate electroluminescent devices.3.Electroluminescent devices were prepared by using P1,P2,P3 as the luminescent layer.The electroluminescent properties of P1,P2,P3 were studied.The results show that the P1,P2 electroluminescence spectra have good stability.Compared with the electroluminescent properties of MEH-PPV,the introduction of SFX into the polymer can balance holes and improve the electron injection ability,thus it can improving the electroluminescence performance of the polymer to a certain extent.