ALEXANDRIA, Va., March 26 -- United States Patent no. 12,262,574, issued on March 25, was assigned to Semiconductor Energy Laboratory Co. Ltd. (Atsugi, Japan).
"Light-emitting element" was invented by Satoshi Seo (Kanagawa, Japan), Hiromi Seo (Kanagawa, Japan) and Tatsuyoshi Takahashi (Kanagawa, Japan).
According to the abstract* released by the U.S. Patent & Trademark Office: "To provide a light-emitting element which uses a fluorescent material as a light-emitting substance and has higher luminous efficiency. To provide a light-emitting element which includes a mixture of a thermally activated delayed fluorescent substance and a fluorescent material. By making the emission spectrum of the thermally activated delayed fluorescent substanc...