Electric lamp and discharge devices – With luminescent solid or liquid material – Solid-state type
Reexamination Certificate
2006-02-07
2006-02-07
Patel, Vip (Department: 2879)
Electric lamp and discharge devices
With luminescent solid or liquid material
Solid-state type
C313S506000
Reexamination Certificate
active
06995509
ABSTRACT:
The present invention provides a white organic light-emitting element high in the emission efficiency. In particular, the invention provides a white organic light-emitting element that has an emission spectrum having peaks in the respective wavelength regions of red color, green color and blue color and is high in the emission efficiency.Since a spectrum region lowest in the emission efficiency is a red region, by introducing a reddish phosphorescent material, a highly efficient white organic light-emitting element is obtained. At this time, in order to inhibit the reddish phosphorescent material from singularly emitting, as shown in FIG.1, a distance between a second emission region114where a reddish phosphorescent material124is a luminescent material and a first emission region113that exhibits emission in a shorter wavelength side than the second emission region is separated. In a configuration shown in FIG.1, it is preferable to use an electron transport material in a layer115between the first emission region and the second emission region and more preferable to use a hole block material.
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Seo Satoshi
Yamazaki Hiroko
Costellia Jeffrey L.
Nixon & Peabody LLP
Patel Vip
Semiconductor Energy Laboratory Co,. Ltd.
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