| Abstract
| - Blue light-emitting bisorthometalated Ir(III) complex with substitutional pyridine and phosphine ligands hasbeen studied. From quantum chemical calculation we suggest that the blue emission can be ascribed to theredistribution of the molecular orbitals after the phosphine ligand has been introduced. This result is not onlyhelpful to investigate the emission mechanism of the Ir(III) complex but also is meaningful for the design ofnew luminescent materials based on organometallics. The electrophosphorescent polymer light-emitting diodesbased on the Ir(III) complex have low turn-on voltages less than 4 V. The brightness and external quantumefficiency (EQE) for the single-layer device reaches 1190 cd/m2 at 12 V and 2.1% at a current density of9.85 mA/ cm2, respectively. For the multilayer device, because of more balanced carrier injection, the externalquantum efficiency reaches 4.0% at a current density of 3.3 mA/cm2.
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