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:
Mar. 03, 1992
Filed:
Feb. 12, 1991
Syun Egusa, Yokohama, JP;
Kabushiki Kaisha Toshiba, Kawasaki, JP;
Abstract
An organic electroluminescent device is constituted by first and second electrodes opposing each other and a multilayered body having a plurality of organic films sandwiched between the electrodes and including an electroluminescent layer. A donor impurity is doped in a first organic film in contact with the first electrode, and an acceptor impurity is doped in a second organic film in contact with the second electrode. A third organic film sandwiched between the first and second organic films serves as an electroluminescent layer. A material having a band gap narrower than those of the first and second organic films is selected as a material of the third organic film so as to confine carriers. No impurity is doped in the third organic film.