High-Performing Organic Electron-injecting and Transporting Layers for Red, Green, Blue, and White OLED Devices

摘要

A 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 Alq{sub}3:Bphen ETL. At 20 mA/cm{sup}2 current density, red device performance is 10.8 cd/A operating at 3.9 V and color CIE{sub}(xy) = 0.66, 0.34; green performance is 18.4 cd/A at 4.2 V and color CIE{sub}(xy) = 0.29, 0.62; deep blue performance is 7.7 cd/A at 3.7 V and color CIE{sub}(xy) - 0.14, 0.13; blue-green performance is 21.1 cd/A at 4.2 V and color CIE{sub}(xy) - 0.16, 0.37 and a white device is 13.2 cd/A at 3.8 V and color CIE{sub}(xy) = 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.