ALEXANDRIA, Va., Aug. 26 -- United States Patent no. 12,402,218, issued on Aug. 26, was assigned to UDC IRELAND Ltd. (Dublin).
"Organic electroluminescent device" was invented by Akira Takeda (Kanagawa, Japan).
According to the abstract* released by the U.S. Patent & Trademark Office: "An organic electroluminescent device includes a pair of electrodes; and an organic layer between the pair of electrodes, which includes a light-emitting layer, wherein the organic layer contains a compound represented by the following formula (I); and the light-emitting layer contains a iridium complex phosphorescent material:wherein R1, R2, R3, R4, R5, R6, R7 and R8 each represents a hydrogen atom or a substituent, and contiguous substituents of R1 to R8 m...