ALEXANDRIA, Va., June 18 -- United States Patent no. 12,329,028, issued on June 10, was assigned to NIPPON STEEL CHEMICAL & MATERIAL Co. LTD. (Tokyo).
"Organic electroluminescent element" was invented by Junya Ogawa (Tokyo), Yuji Ikenaga (Tokyo), Kazunari Yoshida (Tokyo) and Ikumi Kitahara (Tokyo).
According to the abstract* released by the U.S. Patent & Trademark Office: "Provided is an organic EL device including: a light emitting layer between an anode and a cathode facing each other, in which the light emitting layer contains a first host, a second host, and a luminescent dopant, an indolocarbazole compound represented by General Formula (1) is contained as the first host, and a biscarbazole compound or a dibenzofuran compound having ...