Printable phosphorescent organic light‐emitting devices

Abstract

Abstract— A new approach to full‐color printable phosphorescent organic light‐emitting devices (P 2 OLEDs) is reported. Unlike conventional solution‐processed OLEDs that contain conjugated polymers in the emissive layer, the P 2 OLED's emissive layer consists of small‐molecule materials. A red P 2 OLED 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/m 2 , a green P 2 OLED with a luminous efficiency of 34 cd/A and a projected lifetime of 63,000 hours from an initial luminance of 1000 cd/m 2 , a light‐blue P 2 OLED with a luminous efficiency of 19 cd/A and a projected lifetime 6000 hours from an initial luminance of 500 cd/m 2 , and a blue P 2 OLED with a luminous efficiency of 6.2 cd/A and a projected lifetime of 1000 hours from an initial luminance of 500 cd/m 2 is presented.