The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Dec. 03, 2024
Filed:
Dec. 11, 2019
Idemitsu Kosan Co., Ltd., Tokyo, JP;
Takushi Shiomi, Sodegaura, JP;
Hiromi Nakano, Sodegaura, JP;
IDEMITSU KOSAN CO., LTD., Tokyo, JP;
Abstract
An organic EL device includes an anode, a cathode, and an emitting layer interposed between the anode and the cathode, in which the emitting layer includes a delayed fluorescent compound M2 and a compound M3 represented by a formula (100), and a singlet energy S(M2) of the compound M2 and a singlet energy S(M3) of the compound M3 satisfy a numerical formula (Numerical Formula 1). In the formula (100), Xis an oxygen atom or a sulfur atom, Cis a carbon atom, Rto R, R, R, R, R, R, Rand Rto Rare each independently a hydrogen atom, substituent or the like, n is 1, 2, or 3. When Lis a single bond, n is 1, k is 1, 2, or 3, m is 2, 3, or 4, k+m=5, and Lis a single bond or linking group.