Hybrid white organic light-emitting diodes with improved color stability and negligible efficiency roll-off based on blue fluorescence and yellow phosphorescence

► Hybrid WOLEDs are obtained based on efficient yellow phosphorescence PO-01 and blue fluorescence DSA-Ph. ► Balanced carrier injection is realized by employing appropriate emitters to build transporting-channels for electrons. ► The best device shows a peak current efficiency of 21.0 cd/A at 2, 300 cd/m2.