| 초록 |
A series of heteroleptic Ir(III) complexes, acac, pic, and bor, were prepared and their electrochemical and photophysical properties as well as different activation energies depending on ancillary ligand were systematically investigated. Even though the Huang–Rhys factors indicate the structure of bor in the excited state would be mostly changed, result shows that the emission lifetime of bor is longest among the series. We carried out theoretical quantum chemical calculations and measured experimental temperature dependent emission lifetime to explain the importance of activation energy barriers from T1 state to 3MC state in heteroleptic Ir(III) complexes. As a result, both theoretical and experimental investigations showed that the activation energy barrier for bor is significantly higher than acac and pic, which was estimated by temperature dependent emission lifetime experiments with the values of 46, 61, and higher than 100 meV, respectively. |
