Kwang-Ohk Cheon

Printable phosphorescent organic light-emitting devices

— A new approach to full-color printable phosphorescent organic light-emitting devices (P2OLEDs) is reported. Unlike conventional solution-processed OLEDs that contain conjugated polymers in the emissive layer, the P2OLEDs emissive layer consists of small-molecule materials. A red P2OLED that exhibits a luminous efficiency of 11.6 cd/A and a projected lifetime of 100,000 hours from an initial luminance of 500 cd/m2, a green P2OLED with a luminous efficiency of 34 cd/A and a projected lifetime of 63,000 hours from an initial luminance of 1000 cd/m2, a light-blue P2OLED with a luminous efficiency of 19 cd/A and a projected lifetime 6000 hours from an initial luminance of 500 cd/m2, and a blue P2OLED with a luminous efficiency of 6.2 cd/A and a projected lifetime of 1000 hours from an initial luminance of 500 cd/m2 is presented.

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

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 P2OLED (IJ-P2OLED) device is demonstrated for the first time. It shows good color and uniform emission although it uses small-molecule solution. Ink-jet-printed green P2OLED devices possess a high luminous efficiency of 22 cd/A at 2000 cd/m2 and is based on phosphorescent emission. The latest solution-processed phosphorescent OLED performance by spin-coating is disclosed. The red P2OLED exhibits a projected LT50 of >53,000 hours with a luminous efficiency of 9 cd/A at 500 cd/m2. The green P2OLED shows a projected LT50 of >52,000 hours with a luminous efficiency of 35 cd/A at 1000 cd/m2. Also discussed is a newly developed sky-blue P2OLED with a projected LT50 of >3000 hour and a luminous efficiency of 18 cd/A at 500 cd/m2.

22.2: Printable Phosphorescent Organic Light Emitting Devices

This paper reports on a new approach to full-color printable phosphorescent organic light emitting devices (P2OLEDs). Unlike conventional solution processed OLEDs that contain conjugated polymers in the emissive layer, the P2OLEDs emissive layer consists of small molecule hosts and dopants. We present a red P2OLED that exhibits luminous efficiency of 9 cd/A and a projected lifetime of 53,000 hrs from an initial luminance of 500 cd/m2, a green P2OLED with luminous efficiency of 35 cd/A and a projected lifetime 52,000 hrs from an initial luminance of 1000 cd/m2, a light blue P2OLED with luminous efficiencies of 18 cd/A and a projected lifetime 3,000 hrs from an initial luminance of 500 cd/m2, and a blue P2OLED with luminous efficiencies of 6 cd/A and a projected lifetime 1,000 hrs from an initial luminance of 500 cd/m2.