ALEXANDRIA, Va., June 16 -- United States Patent no. 12,655,343, issued on June 16, was assigned to Semiconductor Energy Laboratory Co. Ltd. (Atsugi, Japan).
"Light-emitting element" was invented by Satoshi Seo (Kawasaki, Japan).
According to the abstract* released by the U.S. Patent & Trademark Office: "Provided is a light-emitting element with high external quantum efficiency and a low drive voltage. The light-emitting element includes a light-emitting layer which contains a phosphorescent compound and a material exhibiting thermally activated delayed fluorescence between a pair of electrodes, wherein a peak of a fluorescence spectrum and/or a peak of a phosphorescence spectrum of the material exhibiting thermally activated delayed fluo...