Two iridium phosphorescent complexes IV and IV.-d₂₀ were synthesized by modifying the 2-methyl-8-(2-pyridyl)benzofuran[2,3-B]pyridine auxiliary ligand, introducing electron-absorbing group phenyl at the 4th position of pyridine, and fully deuterated the two methyl groups of the 5-methyl-2-p-tolylpyridine main ligand, and characterizing and confirming their structures by elemental analysis, mass spectrometry and nuclear magnetic resonance hydrogen spectroscopy. The photophysical properties and energy level structure were studied by UV-Vis spectroscopy, fluorescence emission spectroscopy (PL) and cyclic voltammetry. The results showed that the emission wavelengths of IV and IV-d₂₀ photoluminescence spectra of iridium complexes were 546.85nm and 548nm, respectively, and their HOMO and LUMO energy levels were -5.237ev and -2.645ev, -5.082ev and -2.50ev, respectively, which were potential yellow-green phosphorescent materials. OLED devices with the structure of ITO/HT:NDP-9(100nm, 2%)/HT(130nm)/EB(10nm)/GH:compound IV or IV-d₂₀(40nm, 5%)/HB(10nm)/ET:Liq (35nm, 50%)/Liq(10nm)/Al (150nm) were prepared with iridium complexes IV and IV-d₂₀/HB(10nm)/ET:Liq (35nm, 50%)/Liq(10nm)/Al(150nm), and their device performance was studied. The results showed that iridium complex IV-d₂₀ showed better device performance. At a current density of 20mA/cm₂^{, the device of iridium complex IV-d}₂₀ emits at a wavelength of 552nm, a CIE coordinate of (0.422, 0.569), a current efficiency of 87.00cd/A, and an external quantum efficiency (EQE) of 23.82%.