Fused Heterocyclic Compounds And Their Optical Properties Of Iridium Complexes

Organic electroluminescent materials because they have a low cost, full-color display of the potential value have been received extensive attention. Because the heavy metal complexes (platinum, osmium, iridium, etc.) as the mainly phosphorescent electroluminescent light emitting materials have got the most active current in the field of the organic electroluminescence light emitting. In these complexes, the heavy metal ions produce a strong spin-orbit coupling, which can take advantage of both the singlet state and the triplet light-emitting. The light radiation can be simply divided into two kinds of fluorescent and phosphorescent. Usually, light fluorescence generated from the singlet excitons, while the light generated by the triplet state is the phosphorescence. The maximum internal quantum efficiency of OLED devices based on fluorescence and phosphorescence materials are25%and100%.This thesis has designed and synthesized a series of phthalazine derivatives as ligands tricyclic iridium complexes. Their structure, photophysical properties and luminescence properties are studied their application in the field of electrochemistry. We detailedly study the relationship between the ligand substitution group structure and complex photophysical and electrochemical properties. By changing the chemical structure of the ligand, to achieve a regulation of light emitting iridium complexes in solution from orange to red. These complexes can be used as a guest emitting material doped into the host material as the light emitting layer to be applied in the OLED.In this thesis, we has designed and synthesized a series of2-aryl quinazoline or2-heteroaryl quinazoline compounds. Their structures are charactered and analysed by NMR and MODI-TOF-MS mass spectrometry, also study and discuss their UV-visible absorption and fluorescence emission spectra of light-emitting compounds, which are affected by the structure of substituent groups.We synthesize novel iridium complexes using TpQx and PhQx as the ligands, also study their structures and the photophysical properties. The iridium complexe Ir(TpQx)2(pic) is doped into the host materials to observe the effects of the energy transfer by changing the doping concentration.