Ultra-simple two color WOLEDs with CRI exceeding 90 based on electron-transporting Bepp2 simultaneously as blue emitter and exciplex acceptor

All fluorescent two-color WOLED, structured by simply doping exciplex donor m-MTDATA in exciplex acceptor Bepp2 of bilayer structure TAPC/Bepp2, achieves a high power efficiency of 11.08 lm/W and an ultra-high CRI of 93.263