ALEXANDRIA, Va., July 7 -- United States Patent no. 12,677,591, issued on July 7, was assigned to Samsung Display Co. Ltd. (Yongin-si, South Korea).
"Organic electroluminescent device" was invented by Harald Fluegge (Karlsruhe, Germany), Sandra Bonus (Cologne, Germany) and Christian Kasparek (Heidelberg, Germany).
According to the abstract* released by the U.S. Patent & Trademark Office: "The present invention relates to organic electroluminescent devices comprising a light-emitting layer B comprising a triplet-triplet annihilation (TTA) material, a thermally activated delayed fluorescence (TADF) material and a near-range-charge-transfer (NRCT) emitter material, which exhibits a narrow-expressed by a small full width at half maximum (FWHM...