An organic electroluminescence device includes an anode, an emitting layer, and a cathode in this order. The emitting layer contains a delayed fluorescent compound M2 and a compound M3 having at least one deuterium atom, and the compound M3 is not a compound having a partial structure represented by a formula (1C) or (2C). S1(M2) of the compound M2 and S1(M3) of the compound M3 satisfy a relationship of a numerical formula (Numerical Formula 1). In the formulae (1C) and (2C), Y41 to Y48 are each independently a N atom, CR, or a C atom bonded to another atom or the like in the compound M3, where each R is independently a H atom or a substituent, at least one of Y41 to Y48 is a N atom, and at least one of Y41 to Y48 is a C atom bonded to another atom or the like in the compound M3. S1M3>S1M2
一种有机电致发光装置依次包括阳极、发光层和阴极。发射层包含延迟荧光化合物 M2 和具有至少一个
氘原子的化合物 M3,而化合物 M3 并非具有式(1C)或(2C)所代表的部分结构的化合物。化合物 M2 的 S1(M2)和化合物 M3 的 S1(M3)满足数值式(数值式 1)的关系。在式 (1C) 和 (2C) 中,Y41 至 Y48 在化合物 M3 中各自独立地为 N 原子、CR 或与另一个原子或类似原子键合的 C 原子,其中每个 R 独立地为 H 原子或取代基,Y41 至 Y48 中至少有一个为 N 原子,Y41 至 Y48 中至少有一个为与另一个原子或类似原子键合的 C 原子。S1M3>S1M2