ALEXANDRIA, Va., Feb. 17 -- United States Patent no. 12,552,984, issued on Feb. 17, was assigned to SFC Co. LTD. (Cheongju-si, South Korea).
"Organic electroluminescent device" was invented by Seok-bae Park (Cheongju-si, South Korea), Yu-rim Lee (Cheongju-si, South Korea), Hee-dae Kim (Cheongju-si, South Korea), Seoungeun Woo (Cheongju-si, South Korea) and Dong Myung Park (Cheongju-si, South Korea).
According to the abstract* released by the U.S. Patent & Trademark Office: "Disclosed is an organic electroluminescent device that employs a compound represented by Formula A-1 or A-2: and a compound represented by Formula B: The organic electroluminescent device has excellent luminescent properties such as high color purity and long lifetime....