ALEXANDRIA, Va., June 9 -- United States Patent no. 12,289,991, issued on April 29, was assigned to Samsung Display Co. Ltd. (Yongin-si, South Korea).
"Organic electroluminescence device" was invented by Junta Fuchiwaki (Yokohama, Japan), Ikuo Sasaki (Yokohama, Japan), Shuri Sato (Yokohama, Japan) and Nobutaka Akashi (Yokohama, Japan).
According to the abstract* released by the U.S. Patent & Trademark Office: "An organic electroluminescence device including a first electrode, a hole transport region on the first electrode, an emission layer on the hole transport region, an electron transport region on the emission layer, and a second electrode on the electron transport region, wherein the hole transport region includes a first heterocycli...