The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Sep. 10, 2002
Filed:
Oct. 08, 1999
Harumi Suzuki, Kariya, JP;
Takeshi Ishikawa, Nishikasugai-gun, JP;
Junji Kido, Kitakatsuragi-gun, Nara-ken, 635-0831, JP;
Other;
Abstract
An organic electroluminescent panel having two luminescent layers interposed between a pair of electrode layers emits white light or colored light. One luminescent layer is composed of a hole transport host material and a first fluorescent material doped in the host material, and the other luminescent layer is composed of an electron transport host material and a second fluorescent material doped in the host material. Both luminescent layers simultaneously emit respective lights which in turn are mixed into a white light or colored light. To realize the simultaneous light emission from both luminescent layers and to enhance energy conversion efficiency, organic materials having a solid state fluorescence spectrum peak wavelength in a range of 380 nm-510 nm are used as both host materials, and materials having a solid state fluorescence spectrum which overlaps with that of the host materials or is shifted to a longer wavelength side are used as the fluorescent materials doped in the host materials. The light color emitted from the panel is arbitrarily controlled by selecting the fluorescent dopant materials.