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High-performance phosphorescent white organic light-emitting devices (PhWOLEDs) with color stability and low efficiency decay are demonstrated by inserting wide band-gap materials between emitting layers. The two devices with N,N’- dicarbazolyl-3,5-benzene (mCP) and p-bis(triphenylsilyl)benzene (UGH2) as the interlayer exhibit both slight Commission Internationale del’Eclairage (CIE) coordinates variations of (±0.010, ±0.005) and (±0.013, ±0.006) in a wide voltage range, and low decay in current efficiency which shifts from the peak value 35.4 cd·A-1 and 27.4 cd·A-1 to 28.8 cd·A-1 and 23.5 cd·A-1 at 40000 cd·m-2 , respectively. The improvements are attributed to the charge carriers balance and the elimination of energy transfer loss by confining the carrier accumulation at the exciton formation interface through the interlayer.
High-performance phosphorescent white organic light-emitting devices (PhWOLEDs) with color stability and low efficiency decay are demonstrated by inserting wide band-gap materials between emitting layers. The two devices with N, N’-dicarbazolyl-3,5-benzene mCP) and p-bis (triphenylsilyl) benzene (UGH2) as the interlayer exhibit both slight Commission Internationale del’Eclairage (CIE) , and low decay in current efficiency which shifts from the peak value 35.4 cd · A-1 and 27.4 cd · A-1 to 28.8 cd · A-1 and 23.5 cd · A-1 at 40,000 cd · m-2, respectively. The improvements are attributed to the charge carriers balance and the elimination of energy transfer loss by confining the carrier accumulation at the exciton formation interface through the interlayer.