Concentration-insensitive phosphorescent organic light emitting devices (PhOLEDs) for easy manufacturing

International audienceTwo heteroleptic iridium(III) complexes Ir(piq)(2)(dbm) and Ir(btp)(2)(acac) have been tested as emitters for phosphorescent OLEDs (PhOLEDs). Interestingly, device performance exhibited a marked insensitivity to the dopant concentration. In this study, a dibenzoylmethane (dbm)-based complex has also been tested for the first time as dopant for OLEDs. To evaluate the emissive properties of this new emitter belonging to a family of complexes that has not been investigated yet, identical devices were prepared with the well-known red dopant Ir(btp)(2)(acac) for comparison. The new complex Ir(piq)(2)(dbm) exhibited comparable performance to that obtained with Ir(btp)(2)(acac). (C) 2014 Elsevier B.V. All rights reserved