ALEXANDRIA, Va., Oct. 28 -- United States Patent no. 12,454,522, issued on Oct. 28, was assigned to GUANGDONG AGLAIA OPTOELECTRONIC MATERIALS Co. LTD (Foshan, China).

"Preparation and use of tetradentate platinum(II) complex" was invented by Jian Kang (Foshan, China), Lei Dai (Foshan, China) and Lifei Cai (Foshan, China).

According to the abstract* released by the U.S. Patent & Trademark Office: "The present invention relates to preparation and application of a novel quadridentate platinum (II) complex, and belongs to the field of OLED organic electroluminescent materials. The complex of the present invention has NCNC chelating coordination, a stable structure, a spiro ring structure in the skeleton, a strong molecular stereoscopic proper...