Stock material or miscellaneous articles – Composite – Of inorganic material
Reexamination Certificate
2004-02-12
2008-09-02
Garrett, Dawn (Department: 1794)
Stock material or miscellaneous articles
Composite
Of inorganic material
C428S917000, C313S504000, C313S506000
Reexamination Certificate
active
07419727
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.
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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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