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

Abstract

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/m 2. 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.

Stack design of OLEDs with high performance and simplified device structures

“…In particular, the HTL and p‐dopant materials used in Device‐16 are HT‐2 and PD‐2. We use the same charge‐generation layer (CGL) as developed in our previous work 22 in these tandem devices. The CGL layer consists of an n‐type material and a p‐type material, with a total thickness of 45 Å.…”

38.1: Invited Paper: High Performance Deep Red Three‐Unit Tandem OLEDs for Automotive Lighting Applications

“…The CGL layer consists of an n-type material and a p-type material, with a total thickness of 45 Å. In particular, we updated this CGL material set from our previous report [12] which provides improved device stability.…”

62‐1: Invited Paper: TurboLED: Smart Display Design

“…With a phosphorescent material, light blue efficacy could potentially be even higher. It was further assumed the efficacy of emissive units in a TurboLED ® device are equivalent to single emissive unit OLEDs, as demonstrated by Pang et al [5] with minimal losses arising from the middle electrode. The origin of the power reduction can be explained with reference to Fig.…”