Synthesis And Performance Research Of New Iridium(?)and Rhenium(?) Complexes

In recent years,organic light-emitting diodes(OLEDs)had developed very rapidly,because of its high contrast,wide viewing angle and light weight,it had become a hot topic in the field of electroluminescence.Some organic electroluminescent materials had been applied,but there are shortcomings such as light color purity,low efficiency,and insufficient brightness.In order to solve these problems,this paper designed and synthesized iridium(?),rhenium(?)complexes of luminescent materials,and its performance was studied,the main conclusions are as follows:Three blue-light-emission iridium complexs was designed and synthesized.Main ligand was obtained by two step smoothly Suzuki coupling reaction,the ligand with iridium intermediate after coordination,with three different auxiliary ligand dissociation pyridine,to adjust the luminescent properties of materials,finally got three new iridium complexes.The structure of the iridium complexes was characterized,and the target complexes were confirmed by nuclear magnetic and high-definition mass spectrometry.The photophysical properties of the PMMA films were studied,and the results showed that the doping in PMMA films showed blue-light-emission,and the emission wavelength of deep blue light was 445 nm.And the fluorescence quantum efficiency of the three complexes was measured to be 38%-50%.A novel iridium(?)complex(Ir(tpit)(dcbde)Cl,tpit H2 = triphenylphosphite,dcbde = 2,2'-bipyridyl-4,4'-dicarboxylic acid diethyl ester)was synthesized in a high yield by a one-pot reaction.Ir(tht)3Cl3 was used as iridium regent and tpit H2 as dicyclometalated tridentate ligand,while dcbde was used as neutral ligand.This new iridium(?)complex was characterized by the NMR,high resolution mass spectroscopies and X-ray structural analysis.The film blended with this complex and PMMA shows a strong yellow phosphorescent emission at 580 nm.The observed emission lifetime is ca.1.08 ?s,together with high quantum yield of 29.4% in PMMA film.However,this complex shows weak luminescence in CH2Cl2.The emission intensity of the complex in H2O(70%)/THF solution was about 17 times higher than that in pure THF solvent,indicating that this complex has a strong AIEE property.Ph OLED was fabricated using the complex as the dopant phosphor.The device architecture comprises a simple single emissive layer,which is a blend of m CP as the host material and the Ir(?)complex as the dopant with this device configuration: ITO / HAT-CN(10 nm)/ TAPC(35 nm)/ TCTA(10 nm)/ m CP : 10 wt% guest(20 nm)/ Tm Py PB(50 nm)/ Liq(1 nm)/ Al(120 nm).The device has a turn-on voltage of 4.3 V and shows good luminescent efficiency(8.9 %,9.7 cd/A,5.2 lm/W).The device shows a maximum luminance of 3791 cd/m2 at 12.7 V.The Commission Internationale de L'Eclairage(CIE)coordinates were calculated to be(0.52,0.48).The results show that the strong field ligand tpit can improve the luminous efficiency of bipyridine carboxylate based Iridium complexes and extend its scope of application.During the work,a group of(N^N)ligand neutral rhenium(?)complexes was synthesized.In this part,a group of neutral rhenium(?)complexes containing conch N^N ligands were synthesized,the structure of the rhenium complexes was characterized,and complexes were confirmed by nuclear magnetic and high-definition mass spectrometry.Complexes doped in PMMA show green light emission wavelength of about 526 nm,Re1 and Re2 fluorescence lifetime was 4998.779 ns and 4420.166 ns,and quantum yield as high as 39.08% and 36.56%,which can be used to make pure green devices.