| abstract |
An organic electroluminescent element (1) provided with a light-emitting layer (5), in which the light-emitting layer (5) contains at least one single-layer containing a first host material, a second host material and a luminescent compound, the first host material and the second host material are different from each other, and the triplet energy T 1 (H1) of the first host material, the triplet energy T 1 (H2) of the second host material and the triplet energy T 1 (D) of the luminescent compound satisfy at least one of the relationships respectively represented by a mathematical formula (mathematical formula 1) and a mathematical formula (mathematical formula 2). (Mathematical formula 1) T 1 (D) > T 1 (H1)n(Mathematical formula 2) T 1 (D) > T 1 (H2) |