MoO3 as a cathode buffer layer for enhancing the efficiency in white organic light-emitting diodes

• 来源期刊: 光电子快报（英文版）
• 年，卷（期）: 2012,（4）
• 页码范围: 256-259
• 页数: 4页
• 语种: 英文
• DOI: 10.1007/s11801-012-2241-6

摘要

Molybdenum trioxide (MoO3) as a cathode buffer layer is inserted between LiF and Al to improve the efficiency of white organic light-emitting diodes (OLEDs) in this paper.By changing the MoO3 thickness,a higher current efficiency of 5.79 cd/A is obtained at a current density of 160 mA/cm2 for the device with a 0.8 nm-thick MoO3 layer as the cathode buffer layer,which is approximately two times greater than that of the device without MoO3.The mechanism for improving the device efficiency is discussed.Moreover,at a voltage of 13 V,the device with a 0.8 nm-thiek MoO3 layer achieves a higher luminance of 22370 cd/mz,and the Commission Internationale de I'Eclairage (CIE) color coordinate of the device with 1nm-thick MoO3 layer is (0.33,0.34),which shows the best color purity.Simple electron-only devices are tested to confirm the impact of the MoO3 layer on the carrier injection.