83‐1: Invited Paper: Optimization of High Performance Deep Red OLEDs Using Tandem Structure for Automotive Lighting Application

We report here high performance deep red OLED devices for automotive lighting applications, through optimizing the organic stacks in a tandem structure. We first developed a deep red phosphorescent emitter that has a PL peak wavelength at 639 nm. A 2‐unit device incorporating this emitter along with a novel charge‐generation layer, was tuned to achieve an external quantum efficiency of 48%, a current efficiency of 26 cd/A, LT95 of 11,000 hrs, and a bias voltage of 8.2 V at 2,000 cd/m2. This tandem device reaches a deep red chromaticity with a dominant wavelength of 625nm, and CIE (X, Y) = (0.70, 0.30), as well as a near‐Lambertian emission pattern.