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:
Jun. 18, 2002
Filed:
Feb. 03, 1999
Shizuo Tokito, Aichi, JP;
Koji Noda, Aichi, JP;
Hisayoshi Fujikawa, Aichi, JP;
Yasunori Taga, Aichi, JP;
Kabushiki Kaisha Toyota Chuo Kenkyusho, Aichi-gun, JP;
Abstract
An optical resonator type organic electroluminescent element has a multilayered film mirror , a transparent electrode , an electron hole transportation layer and a luminescent layer configuring an organic layer, and a metallic electrode mirror , formed on a glass substrate . The optical resonator type organic electroluminescent element amplifies a specific wavelength (especially, in a range of about 30 nm toward a shorter wavelength side from a luminescence peak wavelength of the organic layer) in luminescence light by a minute optical resonator, which comprises the multilayered film mirror and the metallic electrode mirror . It is determined that the minute optical resonator has an optical length L which is twice as long as a resonance wavelength, the organic layer has a thickness of 100 nm or more, and the transparent electrode has a thickness of 50 nm or more or a thickness so to have a sheet resistance of 30 &OHgr;/□ or less. Thus, the transparent electrode can be prevented from generating heat even when a large current is caused to flow into it, and the element characteristics can be reliably prevented from being deteriorated. Moreover, the reliability of this element can be improved because the organic layer containing the luminescent layer has a sufficient thickness.