ALEXANDRIA, Va., Feb. 17 -- United States Patent no. 12,552,821, issued on Feb. 17, was assigned to BEIJING SUMMER SPROUT TECHNOLOGY Co. LTD. (Beijing).

"Organic electroluminescent material and device thereof" was invented by Zhen Wang (Beijing), Hongbo Li (Beijing), Ming Sang (Beijing), Wei Cai (Beijing), Chi Yuen Raymond Kwong (Beijing) and Chuanjun Xia (Beijing).

According to the abstract* released by the U.S. Patent & Trademark Office: "Provided are an organic electroluminescent material and a device thereof. The organic electroluminescent material is a metal complex including a ligand La having a structure of Formula 1, and the metal complex can be used as luminescent materials in electroluminescent devices. These new compounds, when...