Stock material or miscellaneous articles – Composite – Of inorganic material
Reexamination Certificate
2008-09-02
2008-09-02
Garrett, Dawn (Department: 1794)
Stock material or miscellaneous articles
Composite
Of inorganic material
C428S917000, C313S504000, C313S506000
Reexamination Certificate
active
10545165
ABSTRACT:
This invention has an objective to improve durability at elevated temperature in organic electroluminescent devices using coumarin derivatives as dopant in a luminescent layer. This invention attains the above objective by providing in the organic electroluminescent devices formed by laminating an anode, a hole injection layer, a hole transportation layer, a luminescent layer, an electron transportation layer and a cathode in this order, the luminescent layer which comprises as dopant the green light-emitting coumarin derivative and hole- and electron-transporting substances as host; said coumarin derivative consisting of a plurality of coumarin groups bound to an aromatic ring, heterocycle, or any combination thereof, and exhibiting a glass transition point of 150° C. or higher or a melting point of 297° C. or higher.
REFERENCES:
patent: 5635308 (1997-06-01), Inoue et al.
patent: 6020078 (2000-02-01), Chen et al.
patent: 6285039 (2001-09-01), Kobori et al.
patent: 2004/0124766 (2004-07-01), Nakagawa et al.
patent: 2005/0089713 (2005-04-01), Satsuki et al.
patent: 2005/0275341 (2005-12-01), Satsuki et al.
patent: 11-354280 (1999-12-01), None
patent: 2000-182772 (2000-06-01), None
patent: 2000-192028 (2000-07-01), None
patent: A 76876/01 (2001-03-01), None
patent: 2001-329257 (2001-11-01), None
patent: A 226484/02 (2002-08-01), None
Van Slyke et al., Appl. Phys. Lett., vol. 69 (15), Oct. 7, 1996, p. 2160-2162.
Fujiwara, M. et al., “Investigation of Blue Dopant Used Coumarin Derivatives,” Journal of Photopolymer Science and Technology, vol. 15, No. 2(2002)237-238.
Fujikawa Hisayoshi
Fujiwara Makoto
Ishida Natsuko
Ishii Masahiko
Kojima Kazushige
Browdy and Neimark
Garrett Dawn
Kabushiki Kaisha Hayashibara Seibutsu Kagaku Kenkyujo
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