ALEXANDRIA, Va., Nov. 25 -- United States Patent no. 12,484,443, issued on Nov. 25, was assigned to NIPPON STEEL CHEMICAL & MATERIAL Co. LTD. (Tokyo).
"Organic electroluminescent element" was invented by Yuta Sagara (Tokyo) and Masashi Tada (Tokyo).
According to the abstract* released by the U.S. Patent & Trademark Office: "Provided is a thermally activated delayed fluorescent emission-type organic electroluminescent device (organic EL device) having a low driving voltage, high luminous efficiency, and a long lifetime. The organic EL device is a delayed fluorescent emission-type organic EL device including one or more light-emitting layers between an anode and a cathode opposite to each other, wherein at least one of the light-emitting la...