Small molecular and polymer organic light-emitting diodes based on novel iridium complex phosphor

Molecular organic light-emitting devices (MOLED) and polymer devices (POLED) were fabricated using a novel iridium complex bis[2-(4′-tert-butylphenyl)-1-phenyl-1H-benzoimidazole-N,C2′] iridium (III) (acetylacetonate) phosphor as an emissive dye doped in two different host materials. Electroluminescent (EL) property, current density–voltage–luminance, and current efficiency characteristics of two kinds of devices were measured. The results showed that MOLED has a maximum current efficiency of 22.9 cd/A at a luminance of 163 cd/m2, which is higher than that of 7.6 cd/A at 371 cd/m2 for POLED. MOLED and POLED exhibited a maximum luminance of 13,500 and 4181 cd/m2, respectively, with a full width at half-maximum of MOLED spectra is 68 nm, which is much narrower than 116 nm of POLED spectra.