The present invention provides electronic devices comprising novel organic
iridium compositions which provide for enhanced device performance. The
novel iridium compositions employed comprise at least one novel organic
iridium compound which comprises at least one cyclometallated ligand and
at least one ketopyrrole ligand. The organic iridium compositions
employed are referred to as Type (1) organic iridium compositions and are
constituted such that no ligand of the novel organic iridium compound has
a number average molecular weight of 2,000 grams per mole or greater (as
measured by gel permeation chromatography). Type (1) organic iridium
compositions are referred to herein as comprising "organic iridium
complexes". In one aspect, the present invention provides optoelectronic
devices, such as OLED devices and photovoltaic devices. In another
aspect, the invention provides OLED devices exhibiting enhanced color
properties and light output efficiencies.