P-190: Novel Electron-Transporting Layer for Lowering Drive Voltage and Improving the Efficiency of OLED Devices

Abstract

We report herein a new electron-transport layer (ETL) that reduces drive voltage, improves external quantum efficiency, and increases device operational stability. This new ETL has worked with red-, blue-, green-, and white-light emitting devices, but it is exceptionally suitable for improving the performance of the red-emitting device. By employing this new ETL, we prepared a fluorescent red device that provides a record luminance efficiency of 9.3 cd/A, an external quantum efficiency of 6.6%, power efficiency of 6.4 lm/W and color coordinates CIEx,y of 0.65 and 0.35, respectively. Compared to the Alq3 reference ETL, the new ETL decreases the drive voltage by 1.2 V, improves the external quantum efficiency by greater than 50%, and gives a three-fold increase in operational stability. To our knowledge, this is the highest performance obtained from a red-emitting fluorescent device. The new ETL reduces display power consumption while simultaneously increasing operational stability.