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High-Efficiency White Organic Light-Emitting Diodes Using Blue and Red Phosphorescent Materials with Exciton Blocking Layer
- Authors
- Park, Jung Hyun; Seo, Ji Hoon; Seo, Ji Hyun; Lee, Seok Jae; Koo, Ja Ryong; Yoon, Seung Soo; Lee, Seung Hee; Kim, Young Kwan
- Issue Date
- Sep-2008
- Publisher
- AMER SCIENTIFIC PUBLISHERS
- Keywords
- White Organic Light-Emitting Diodes; Exciton Blocking Layer; Two Phosphorescent Dyes
- Citation
- JOURNAL OF NANOSCIENCE AND NANOTECHNOLOGY, v.8, no.9, pp.4607 - 4610
- Journal Title
- JOURNAL OF NANOSCIENCE AND NANOTECHNOLOGY
- Volume
- 8
- Number
- 9
- Start Page
- 4607
- End Page
- 4610
- ISSN
- 1533-4880
- Abstract
- High-efficiency white organic light-emitting diodes (WOLEDs) were fabricated with two emissive layers and an exciton blocking layer (EBL) was sandwiched between two phosphorescent dyes, bis(3,5-difluoro-2-(2-pyridyl)phenyl-(2-carboxypyridyl) iridium III (Flrpic) as the blue emission and iridium(III) bis(5-acetyl-2-phenylpyridinato-N,C2') acetylacetonate ((acppy)(2)Ir(acac)) as the red emission. This EBL effectively prevented a triple-triple energy transfer between the two phosphorescent emissive layers with blue and red emission. The white device showed Commission Internationale De L'Eclairage (CIEx,y) coordinates of (0.33, 0.42) at 22400 cd/m(2), a maximum luminance of 27300 cd/m(2) at 13.2 V, and a maximum luminous efficiency of 26.9 cd/A.
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Related Researcher
- Kim, Young Kwan
- Engineering (Applied Science)