申请人:IDEMITSU KOSAN CO.,LTD.
公开号:US20220263030A1
公开(公告)日:2022-08-18
An organic-EL device includes an emitting-layer, first-layer adjacent to the emitting-layer near the anode, and second-layer adjacent to the emitting-layer near the cathode. The emitting-layer contains first, second and third compounds. The first-layer contains a compound of formula-(A). The second-layer contains a compound of formula-(B). The first, second and third compounds are a fluorescent compound of formula-(1), delayed-fluorescent compound of formula-(2), and compound of formula-(3), respectively. Singlet energies S
1
of the first to third compounds satisfy S
1
(M3)>S
1
(M2)>S
1
(M1). In the formula-(A), Ra
1
-Ra
5
etc. each represent a substituent etc. In the formula-(B), X
1
-X
3
each represent N atom etc, Ar
1
and Ar
2
each represent a group of formula-(1B) etc. A represents the group of the formula-(1B). In the formula-(1B), HAr is of formula-(2B), a is 1 to 5, and L
1
is a linking group etc. In the formula-(2B), X
11
-X
18
each represent N atom etc, and Y
1
represent O, S, or N atom etc.