The facile synthesis of homoleptic phenylpyridazine iridium(III) complexes and their application in high efficiency OLEDs

Abstract

Abstract Two one-pot methods have been used to synthesize various homoleptic phenylpyridazine iridium (III) complexes (2–4). The coordination arrangements of 2 and 3 were revealed by carrying out single X-ray structural analyses. These complexes showed green emission. Their peak wavelengths ranged from 508 to 538 nm with quantum yields greater than 70%. Density functional theory (DFT) was used to discuss the correlation between substituent nature and photophysical characteristics of these complexes. Organic light-emitting diodes (OLEDs) were fabricated by taking 2–4 as dopants. The green device based on complex 4 shows a maximum current efficiency and external quantum efficiency of 78.6 cd A−1 and 21.9%, respectively, and mild efficiency roll-off. The results suggest that these homoleptic phenylpyridazine iridium(III) complexes have potential application as efficient emitters in OLEDs.