ALEXANDRIA, Va., Feb. 24 -- United States Patent no. 12,559,673, issued on Feb. 24, was assigned to NIPPON STEEL CHEMICAL & MATERIAL Co. LTD. (Tokyo).
"Organic electroluminescent element" was invented by Junya Ogawa (Tokyo), Takahiro Kai (Tokyo), Masashi Tada (Tokyo) and Kazunari Yoshida (Tokyo).
According to the abstract* released by the U.S. Patent & Trademark Office: "To provide an organic electroluminescent device having high efficiency and high driving stability while having a low driving voltage. The organic electroluminescent device has one or more light-emitting layers between an anode and a cathode opposed to each other, wherein at least one of the light-emitting layers is a light-emitting layer composed of a vapor deposition lay...