Highly efficient pure white phosphorescent organic light-emitting diodes using a deep blue phosphorescent emitting material

✍ Scribed by Kyoung Soo Yook; Soon Ok Jeon; Chul Woong Joo; Jun Yeob Lee; Myung Seop Kim; Hong Seok Choi; Seok Jong Lee; Chang-Wook Han; Yoon Heung Tak

• Publisher: Elsevier Science
• Year: 2009
• Tongue: English
• Weight: 456 KB
• Volume: 10
• Category: Article
• ISSN: 1566-1199
• DOI: 10.1016/j.orgel.2009.02.023

✦ Synopsis

A high efficiency pure white phosphorescent organic light-emitting diode was developed by combining a deep blue emitting phosphorescent dopant material with red/green phosphorescent emitting materials. A simple stack structure of blue/red:green was used and tris((3,5-difluoro-4-cyanophenyl)pyridine) iridium was used as a deep blue emitting phosphorescent dopant. A pure white emission with a color coordinate of (0.29, 0.31) and a very high current efficiency of 28 cd/A was obtained after managing the device architecture of the all phosphorescent white devices.