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Proceedings Paper

Optimization of driving lifetime durability in organic LED devices using Ir complex
Author(s): Teruichi Watanabe; Kenji Nakamura; Shin Kawami; Yoshinori Fukuda; Taishi Tsuji; Takeo Wakimoto; Satoshi Miyaguchi
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Paper Abstract

Multilayer organic light-emitting device with phosphorescent guest emitter, tris(2-phenylpyridine)iridium [Ir(ppy)3] doped in a host 4,4'-N,N'-dicarbazol-biphenyl (CBP) layer, exhibited very high luminous efficiency. A device having such phosphorescent guest emitter could not offer sufficiently long driving lifetime required by real products. On the other hand, phosphorescence in organic molecules rarely occurs at room temperature. We studied ways to increase driving lifetime by three types of experiments. First, we investigated to see whether the driving lifetime is dependent on guest molecule concentration. Second, we inserted Copper phtalocyanine (CuPc) between Indium Tin Oxide (ITO) anode and hole transport layer, 4,4'-bis[N- (naphthyl)-N-phenyl-amino]biphenyl (NPB) to prevent driving voltage from rising during constant current operation. Finally, we exchanged the hole blocking layer, which is 2,9-dimethyl-4,7-diphenyl-1,10-phenanthroline (BCP), for [(1,1'-biphenyl)-4-olato]bis(2-methyl-8- quinolinolato N1,08)aluminum (BAlq). Optimizing all of the above mentioned steps, we can expect the half decay lifetime of 20000 hours or over at an initial luminance of 100 cd/m2 by constant current driving.

Paper Details

Date Published: 2 February 2001
PDF: 8 pages
Proc. SPIE 4105, Organic Light-Emitting Materials and Devices IV, (2 February 2001); doi: 10.1117/12.416892
Show Author Affiliations
Teruichi Watanabe, Pioneer Corp. (Japan)
Kenji Nakamura, Pioneer Corp. (Japan)
Shin Kawami, Pioneer Corp. (Japan)
Yoshinori Fukuda, Pioneer Corp. (Japan)
Taishi Tsuji, Pioneer Corp. (Japan)
Takeo Wakimoto, Pioneer Corp. (Japan)
Satoshi Miyaguchi, Pioneer Corp. (Japan)

Published in SPIE Proceedings Vol. 4105:
Organic Light-Emitting Materials and Devices IV
Zakya H. Kafafi, Editor(s)

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