Ink‐jet‐printable phosphorescent organic light‐emitting‐diode devices

Abstract

Abstract— A novel method for the fabrication of ink‐jet‐printed organic light‐emitting‐diode devices is discussed. Unlike previously reported solution‐processed OLED devices, the emissive layer of OLED devices reported here does not contain polymeric materials. The emission of the ink‐jet‐printed P 2 OLED (IJ‐P 2 OLED) device is demonstrated for the first time. It shows good color and uniform emission although it uses small‐molecule solution. Ink‐jet‐printed green P 2 OLED devices possess a high luminous efficiency of 22 cd/A at 2000 cd/m 2 and is based on phosphorescent emission. The latest solution‐processed phosphorescent OLED performance by spin‐coating is disclosed. The red P 2 OLED exhibits a projected LT50 of >53,000 hours with a luminous efficiency of 9 cd/A at 500 cd/m 2 . The green P 2 OLED shows a projected LT50 of >52,000 hours with a luminous efficiency of 35 cd/A at 1000 cd/m 2 . Also discussed is a newly developed sky‐blue P 2 OLED with a projected LT50 of >3000 hour and a luminous efficiency of 18 cd/A at 500 cd/m 2 .