Solution processed white phosphorescent organic light-emitting diodes with a double layer emitting structure

Solution processed multilayer white phosphorescent organic light-emitting diodes with a double layer emitting structure were developed using an alcohol soluble phosphorescent host and dopant materials. An alcohol soluble blue phosphorescent emitting layer was spin coated on a toluene soluble red/green emitting layer. A high current efficiency of 17.8 cd/A with a color coordinate of (0.31, 0.46) was obtained from the solution processed double emitting layer white phosphorescent organic light-emitting diodes. In addition, all solution processed multilayer white phosphorescent organic light-emitting diodes were also developed by using the two layer emitting structure. (C) 2010 Elsevier B.V. All rights reserved.