Synthesis And Applications Of Thio-bridged Tetradentate Platinum(?) Complexes

Organic optoelectronic materials are widely used in the field of full-color display and illumination.Blue-light materials play an important role in these materials.The reason is that blue phosphorescent materials can not only be used in the preparation of tricolor displays,thus helping the full-color display,but also the blue phosphorescent materials can be used in white-light devices with orange or red phosphorescent materials.The research of blue phosphorescent materials has attracted wide attention,and tetradentate platinum???complexes is one of the key research objects of blue phosphorescent materials.In this paper,a series of thio-bridged tetradentate platinum???complexes were synthesized and their photoelectric properties were investigated on the basis of previous literature research and our group's work.1.Synthesis of thio-bridged tetradentate platinum???complexes of quinazoline and their photophysical propertiesIn this chapter,the classical tetradentate platinum???complexes bridged by oxygen atoms are replaced by tetradentate platinum???complexes bridged by sulfur atoms,and the blue shift of luminescence color is experimentally studied.In this chapter,we synthesized five tetradentate platinum???complexes based on quinazoline derivatives.When diphenylamine and piperidine were used as substituents of quinazoline,the blue shift of sulfur bridge compared with oxygen bridge was obtained,and the blue shift of 30nm and 4 nm was obtained,respectively.On the other hand,because the conjugation degree of piperidine is obviously less than carbazole and diphenylamine,the S?qpd?₂Pt emission wavelength is the shortest under the same main quinazoline conditions.2.Synthesis and photophysical properties of pyrimidine-bridged tetradentate platinum complexesIn the previous chapter,the sulfur atom-bridged tetradentate platinum complexes based on quinazoline are mainly luminescent in the red region due to their large conjugation.The introduction of rigid groups makes its solubility worse.In order to obtain phosphorescent materials with shorter wavelength and better solubility.we substituted heterocyclic ligands for pyrimidine.The tetradentate platinum???complexes bridged by sulfur atoms based on pyrimidine ligand were synthesized.The emission wavelength of S?md?₂Pt in solution is 567 nm.Compared with the quinazoline complexes in chapter 1,there is a large blue shift,and phenylenediamine is introduced to pyrimidine.The luminescent properties of the material S?mba?₂Pt were improved,and the blue shift of the material reached 563 nm,by introducing tert butyl into S?mba?₂Pt.The solubility of the material was optimized to make it more soluble.It is easy to fabricate photoelectric devices,at the same time,it also has some blue shift effect on materials.3.Synthesis and photophysical properties of six-membered cyclothio-bridged tetradentate platinum??? complexesAs we all know,there are many valence states of sulfur atoms.We can utilize the multivalent properties of sulfur atoms to change the photophysical properties of the tetradentate platinum???complexes.Based on the blue shift effect of thio-bridged on oxygen bridge luminescence in chapter1,we designed and synthesized a hexagonal chelated cyclothio bridged tetradentate platinum???complex S?czb?₂Pt,with a fluorescence emission wavelength of 548 nm in the solution.On this basis,the tetradentate platinum???complex with sulfone bridge was prepared by sulfur oxide atom,which further made the blue shift of emission reach 414 nm,to adjust the luminous color greatly.