Organic electroluminescent element and electronic device

An organic electroluminescence device, comprising:

• a first emitting layer and a second emitting layer provided between an anode and a cathode, wherein
• the first emitting layer comprises a first host material,
• the second emitting layer comprises a second host material,
• the first host material and the second host material are mutually different,
• the first emitting layer at least comprises a first emitting compound that emits light having a maximum peak wavelength of 500 nm or less,
• the second emitting layer at least comprises a second emitting compound that emits light having a maximum peak wavelength of 500 nm or less,
• a ratio of a total of film thicknesses of the first and second emitting layers to a distance from the cathode to the second emitting layer, the total of film thicknesses of the first and second emitting layers/the distance from the cathode to the second emitting layer, is 0.8 or less,
• the first emitting compound and the second emitting compound are mutually the same or different, and
• a triplet energy of the first host material T1(H1) and a triplet energy of the second host material T1(H2) satisfy a relationship of a numerical formula (Numerical Formula 1) below,
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An organic electroluminescence device, comprising:

• an anode;
• a cathode;
• one or more first emitting layers provided between the anode and the cathode;
• one or more second emitting layers provided between the one or more first emitting layers and the cathode;
• and
• an intermediate layer provided between a pair of emitting layers selected from a plurality of emitting layers consisting of the one of more first emitting layers and the one or more second emitting layers, wherein
• the first emitting layer comprises a first host material,
• the second emitting layer comprises a second host material,
• the first host material and the second host material are mutually different,
• the first emitting layer at least comprises a first emitting compound that emits light having a maximum peak wavelength of 500 nm or less,
• the second emitting layer at least comprises a second emitting compound that emits light having a maximum peak wavelength of 500 nm or less,
• the first emitting compound and the second emitting compound are mutually the same or different,
• the intermediate layer comprises no metal atom,
• materials forming the intermediate layer are each comprised in the intermediate layer at a content ratio of 10 mass % or more, and
• a triplet energy of the first host material T1(H1) and a triplet energy of the second host material T1(H2) satisfy a relationship of a numerical formula (Numerical Formula 1) below,
• T
• 1
• (
• H
• ⁢
• 1
• )
• >
• T
• 1
• (
• H
• ⁢
• 2
• )
• .
• (
• Numerical
• ⁢
• Formula
• ⁢
• 1
• )