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Proceedings Paper

Fabrication and characteristics of flexible layered polymeric electroluminescent diodes fabricated by all-wet process
Author(s): Yutaka Ohmori; Yuichi Hino; Hirotake Kajii
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Paper Abstract

Highly efficiency organic electroluminescent devices employing a phosphorescent dye doped into a wet-processable molecular material have been demonstrated. Methoxy-substituted 1,3,5-tris[4-(diphenylamino)phenyl]benzene (TDAPB) was selected as a host polymer for the phosphorescent dopant fac-tris(2-phenylpyridine) iridium(III) [Ir(ppy)3], and organic films were fabricated by spin-coating method. The peak external quantum efficiency of 8.2 % (29 cd/A), or luminous power efficiency of 17.3 lm/W, and luminance of 33,000 cd/m2 were achieved at a apply voltage of 9.4 V for a 90nm-thick emissive layer. The emission from the host material of TDAPB was not observed in the electroluminescence or photoluminescence spectra. The decrease in efficiencies at a high current is analyzed using the triplet-triplet annihilation model. The high performance is attributed to the simple device structure, excellent film forming properties of the host material, and the efficient energy transfer from the host to dopant.

Paper Details

Date Published: 8 September 2004
PDF: 8 pages
Proc. SPIE 5464, Organic Optoelectronics and Photonics, (8 September 2004); doi: 10.1117/12.545205
Show Author Affiliations
Yutaka Ohmori, Osaka Univ. (Japan)
Yuichi Hino, Osaka Univ. (Japan)
Hirotake Kajii, Osaka Univ. (Japan)

Published in SPIE Proceedings Vol. 5464:
Organic Optoelectronics and Photonics
Paul L. Heremans; Michele Muccini; Hans Hofstraat, Editor(s)

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