Synthesis And Properties Of Novel Phosphorucince Iridium(?) Complexes

Phosphorescent Ir3+ complexes have been widely studied as organic luminescent materials,because of their remarkable properties such as short phosphorescence lifetime,high luminous efficiency and color adjustable and other advantages.These Ir3+ complexes have strong spin orbit coupling on the d orbital of the central atom iridium,which makes the singlet and triplet states mixed and change the spinforbidden radiative relaxation from the triplet excited state to be allowed.In the last few years,the study about phosphorescent Ir3+ complexes mainly focused on designing and synthesizing novel Ir3+ complexes basing on novel ligands,or changing the groups and its position on the ligands to adjust its luminescence wavelength,improve color purity and the luminous efficiency and gained very obvious effect.Therefore,the design and synthesis of novel iridium complexes,the development of efficient,diverse organic electroluminescent materials have far-reaching significance.In this thesis,two novel types of iridium complexes by 2-(phenylsulfonyl)acetophenone(PSAP)containing 2-(p-toluenesulfonyl)acetophenone(2-(p-toluenesulfonyl)acetophenone)containing 2-(p-toluenesulfonyl)acetophenone,TSAP)containing S=O and C=O chelating pisition and N-(1,3-dimethyl-2-oxo-1,3,2-diazaphosphorus heterocyclohexane)benzene containing P=O and C=O chelating pisition(N-(1,3-dimethyl-2-oxido-1,3,2-diazaphosphinan-2-yl)benzamide,DAPB)as an auxiliary ligand,with strong electron-withdrawing groups-F and-CF32-phenylpyridine derivatives 2-(2,4-difluorophenyl)pyridine(2-(2,4-difluorophenyl)pyridine,dfppy),2-(4-trifluoromethylphenyl)pyridine(2-(4-trifluoromethylphenyl)pyridine,tfmppy),2-(2-fluoro-4-trifluoromethylphenyl)as the primary ligands pyridine was synthesized.All Ir3+ complexes were identified and characterized by NMR,IR,MS.UV-vis and PL spectra and CV were measured to determinate their photophysical properties and electrochemical properties.The results show that the energy gap of the complexesis between 2.48-2.82 eV,their max emission wavelengths n the dichloromethane solution is from 479 nm to 517 nm,their max solid emission wavelengths is from 502 nm to 544 nm,and the quantum efficiency of the complex is 6.3-51.1%.Comparing to DAPB,the complexes of PSAP and TSAP have higher fluorescence quantum efficiency with same main ligands.And the complexes with DAPB as the auxiliary ligands have a longer max emission wavelength.Compared with the Ir(C^N)3 type complexes,all titled Ir(C^N)2(L^X)type compounds have higher luminous efficiency.The complexes with PSAP and TSAP as the auxiliary ligands have higher luminous efficiency and better stability.Therefore,the solid powders of these complexes are used to prepare blue light InGaN as the light emitting diode,and their luminescent luminescence properties are tested.The max emission wavelengthss of the diodes is form 507 nm to 543 nm,and the CIE color coordinates show their luminescence in the blue-green and yellow-green areas.Among these complexes,the highest luminous efficiency was 5.6 lm/W due to(ftfmppy)2Ir(TSAP).The CIE color coordinates of the complex(dfppy)2Ir(PSAP)are(0.316,0.431),and the light emitting color is belong to near white.