Small Molecular And Polymer Organic Light-emitting Diodes Based On Novel Iridium Complex Phosphor

摘要

Molecular organic light-emitting devices (MOLED) and polymer devices (POLED) were fabricated using a novel iridium complex bis[2-(4'-fert-butylphenyl)-1-phenyl-lH-benzoimidazole-N,C~2 ] iridium (III) (ace-tylacetonate) 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/m~2, which is higher than that of 7.6 cd/A at 371 cd/m~2 for POLED. MOLED and POLED exhibited a maximum luminance of 13,500 and 4181 cd/m~2, respectively, with a full width at half-maximum of MOLED spectra is 68 nm, which is much narrower than 116 nm of POLED spectra.