Phosphorescent white organic light-emitting devices with color stability and low efficiency decay by using wide band-gap interlayer

• 来源期刊: 光电子快报（英文版）
• 年，卷（期）: 2013,（1）
• 页码范围: 25-29
• 页数: 5页
• 语种: 英文
• DOI: 10.1007/s11801-013-2329-7

摘要

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.