36.2: High‐Performing Organic Electron‐Injecting and Transporting Layers for Red, Green, Blue, and White OLED Devices

Abstract

AbstractA new electron‐injecting layer (EIL) for increasing the efficiency and lowering the power consumption of OLED devices has been developed. The performance of this new EIL, in combination new electron‐transporting layers (ETLs), will be discussed. These devices show superior behavior when compared to controls containing the commonly used LiF injecting material or a lithium‐doped Alq3: Bphen ETL. At 20 mA/cm2 current density, red device performance is 10.8 cd/A operating at 3.9 V and color CIEx,y = 0.66, 0.34; green performance is 18.4 cd/A at 4.2 V and color CIEx,y = 0.29, 0.62; deep blue performance is 7.7 cd/A at 3.7 V and color CIEx,y = 0.14, 0.13; blue‐green performance is 21.1 cd/A at 4.2 V and color CIEx,y = 0.16, 0.37 and a white device is 13.2 cd/A at 3.8 V and color CIEx,y = 0.34, 0.34. At the same operating conditions, the external quantum efficiencies (EQEs) obtained for red, deep blue and blue‐green devices were 8.2%, 6.6%, and 9.7% respectively. These are among the highest efficiencies reported so far for singlet emitting devices.