ALEXANDRIA, Va., April 7 -- United States Patent no. 12,598,860, issued on April 7, was assigned to Sharp K.K. (Sakai City, Japan).
"Light-emitting device" was invented by Yasushi Asaoka (Sakai City, Japan), Jun Sakuma (Sakai City, Japan) and Takahiro Adachi (Sakai City, Japan).
According to the abstract* released by the U.S. Patent & Trademark Office: "A light-emitting device includes a first light-emitting layer disposed between a cathode and an anode and having a light emission central wavelength being a first wavelength; a second light-emitting layer disposed between the anode and the first light-emitting layer, having a light emission central wavelength being a second wavelength shorter than the first wavelength, and having an electr...