High efficiency all phosphorescent white light-emitting diodes based on conjugated polymer host

► Conjugated polymer PFO was used as the matrix of phosphorescent dyes. ► Double doping ratio of FIrpic and Ir(DMFPQ)2pbm in PFO was tuned to 10:1 to achieve white light. ► Back energy transfer was suppressed by hole-transport layer PVK. ► Performances of the WPLEDs were improved via introducing CBP into PVK.