Active solid-state devices (e.g. – transistors – solid-state diode – Organic semiconductor material
Reexamination Certificate
2005-05-16
2010-02-16
Mandala, Victor A (Department: 2826)
Active solid-state devices (e.g., transistors, solid-state diode
Organic semiconductor material
C257S079000, C257S088000, C257S089000, C257SE51018, C257SE51022
Reexamination Certificate
active
07663140
ABSTRACT:
An object of the present invention is to provide a high-efficiency white light emitting element having a spectrum in a wide wavelength range. Another object is to provide a white light emitting element in which chromaticity of white color is hard to change over time. Still another object is to provide a white light emitting element in which the shape of an emission spectrum does not tend to depend on current density. A first light emitting element310and a second light emitting element320are serially laminated over a substrate300. The first light emitting element310has a light emitting layer312between a first anode311and a first cathode313, and the second light emitting element320has a light emitting layer322between a second anode321and a second cathode323. Here, the light emitting layer312shows a first emission spectrum330having peaks both in a blue to blue green wavelength range and in a yellow to orange wavelength range, and the light emitting layer322shows a second emission spectrum340having peaks both in a blue green to green wavelength range and in an orange to red wavelength range.
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Seo Satoshi
Yamazaki Shunpei
Cook Alex Ltd.
Mandala Victor A
Semiconductor Energy Laboratory Co,. Ltd.
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