Solution Processed Blue Phosphorescent Organic Light Emitting Diodes Using a Phosphine Oxide Host Material

Solution processed high efficiency blue phosphorescent organic light emitting diodes were developed using a phosphine oxide derivative (SPPO1) as a host material. The SPPO1 was mixed with a polyvinylcarbazole (PVK), and the optimization of the device gave a high efficiency of 11.9 cd/ A at 1000 cd/m(2). The reduction in the aggregation of the dopant, a smooth surface morphology, and improved charge balance were responsible for the high efficiency in the PVK: SPPO1 mixed host device. (C) 2010 The Electrochemical Society. [DOI: 10.1149/1.3367630] All rights reserved.