Electric lamp and discharge devices – With luminescent solid or liquid material – Solid-state type
Reexamination Certificate
2011-03-01
2011-03-01
Roy, Sikha (Department: 2879)
Electric lamp and discharge devices
With luminescent solid or liquid material
Solid-state type
C313S506000, C428S690000, C428S917000, C257S079000
Reexamination Certificate
active
07898168
ABSTRACT:
A light-emitting element is disclosed with a light-emitting layer containing a host material added with a small amount of guest material, wherein color purity can be improved as well as reduced a driving voltage. Color purity can be improved as well as reduced a driving voltage especially in a light-emitting element added with a red light-emitting material as a guest material. A light-emitting layer is disclosed that includes a first host material, which is an organic compound having a hole transporting property; a second host material, which is an organic compound having a larger dipole moment than that of the first host material; and a guest material having an electron-withdrawing group.
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Abe Hiroko
Ikeda Hisao
Seo Satoshi
Costellia Jeffrey L.
Nixon & Peabody LLP
Roy Sikha
Semiconductor Energy Laboratory Co,. Ltd.
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