Organic electroluminescence device and organic...

Details Organic electroluminescence device and organic... Organic electroluminescence device and organic...

2006-05-11

2009-11-03

Williams, Joseph L (Department: 2889)

Electric lamp and discharge devices

With luminescent solid or liquid material

Solid-state type

C313S498000, C313S506000, C313S512000

Reexamination Certificate

active

07612497

ABSTRACT:
An organic electroluminescence device is provided which employs a metal oxide electrode having particular composition distribution of elements to extend the life. A conventional approach for extending the life of an electroluminescence device is not provided by considering the degradation mechanism of how the organic electroluminescence device is degraded by the driving with electric current. The composite ratio of compounds of an electrode made of metal oxide forming part of the organic electroluminescence device is substantially uniform from a surface through which the carriers are injected from the electrode toward a deeper section in a bulk layer of the electrode. Thus, the electrode has stoichiometrically stable composition to prevent the degradation of electrode materials and diffusion into the organic layer, thereby providing a longer life.

REFERENCES:
patent: 6028327 (2000-02-01), Mizoguchi et al.
patent: 2004/0251815 (2004-12-01), Tokailin et al.
patent: 2004/0265622 (2004-12-01), Sadasivan et al.
patent: 2005/0003231 (2005-01-01), Suzuki et al.
patent: 2006/0132030 (2006-06-01), Gao et al.
patent: 2006/0186801 (2006-08-01), West
patent: 2006/0273713 (2006-12-01), Mehta et al.
patent: 2001-223088 (2001-08-01), None
patent: 2001-223089 (2001-08-01), None

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