| 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<sub>1</sub>(M2) of the compound M2 and a singlet energy S<sub>1</sub>(M3) of the compound M3 satisfy a numerical formula (Numerical Formula 1). In the formula (100), X<sub>1</sub> is an oxygen atom or a sulfur atom, C<sub>1</sub> is a carbon atom, R<sub>11</sub> to R<sub>18</sub>, R<sub>2</sub>, R<sub>31</sub>, R<sub>32</sub>, R<sub>34</sub>, R<sub>35</sub>, R<sub>4</sub> and R<sub>45</sub> to R<sub>48</sub> are each independently a hydrogen atom, substituent or the like, n is 1, 2, or 3. When L<sub>1</sub> is a single bond, n is 1, k is 1, 2, or 3, m is 2, 3, or 4, k+m=5, and L<sub>1</sub> is a single bond or linking group. S1M3>S1M2 |