Novel Approach to Stabilize Blue OLEDs and Fabrication of High Efficiency Tandem White OLEDs for Large-Area Display Applications

摘要

Efficient blue OLEDs with stability similar to white OLEDs were obtained by introducing a non-emitting buffer layer between the yellow- and blue-emitting layers of the 2-layer white OLED. This buffer layer is capable of transporting both holes and electrons. The stabilized blue OLED was then combined with another stack emitting in the G-R region, resulting in a high efficiency tandem white OLED. By appropriate optical tuning, the 2-stack tandem gives luminance efficiency greater than 23 cd/A at near D65 color temperature, very high operational stability, and almost no differential color change with current density or aging. These white structures can be used to fabricate low-power full-color AMOLED displays with excellent lifetime. Modeled performance for a 32" OLED TV with 450 nits peak luminance with these tandem white OLEDs predicts an average power consumption of 40 W, a lifetime of 160,000 h, and color gamut of 102% NTSCx.y.