Abstract: An organic electroluminescence device includes two or more emitting units, where a first emitting unit includes a first emitting zone and a second emitting unit includes a second emitting zone, a high refractive index zone (HN1) and a low refractive index zone (LN1) are disposed between the first and second emitting zones, a total film thickness of one or more high refractive index layers included in the high refractive index zone (HN1) is 20 nm or more, the high refractive index zone (HN1) includes a first high refractive index layer, the low refractive index zone (LN1) includes a first low refractive index layer, the first low refractive index layer contains a first organic material having a refractive index NM1, the first high refractive index layer contains a second organic material having a refractive index NM2, and a relationship of Numerical Formula N1 is satisfied, NM2>NM1 (Numerical Formula N1).

Abstract: The present invention is to provide a compound and a material for an organic electroluminescent device that further improve the capability of the organic EL device, an organic electroluminescent device having a further improved device capability, and an electronic device including the organic electroluminescent device, and relates to a compound represented by the following formula (1) (wherein the symbols in the formula are defined in the description), a material for an organic electroluminescent device containing the compound, an organic electroluminescent device including the compound, and an electronic device including the organic electroluminescent device.

Abstract: A composition includes a first compound and a second compound. The first compound and the second compound are mutually different compounds and are each independently an amine compound having a refractive index of 1.80 or less.

Abstract: To provide a compound for further improving the performance of an organic EL device, a material for an organic electroluminescent device, an organic electroluminescent device having further improved device capability, and an electronic device including such an organic electroluminescent device, and the compound is represented by formula (1). (Each symbol in the formula is as defined in the description.) In addition, the organic electroluminescent device contains the compound or has a highest occupied molecular orbital energy level HOMO, a triplet energy T1, and an 80% attenuation time t of a photoluminescence intensity PL within a predetermined range.

Abstract: A compound represented by the following formula (1): where the symbols in the formula (1) are defined in the description, an organic electroluminescent device containing the compound, and an electronic device including the organic electroluminescent device.

Abstract: An organic electroluminescence device includes: an anode; a cathode; a first emitting layer, and a second emitting layer, in which the first emitting layer includes a first host material in a form of a first compound represented by a formula (1), the second emitting layer includes a second host material in a form of a second compound represented by a formula (2) and having at least one group represented by a formula (21), and the first emitting layer is in direct contact with the second emitting layer.

Abstract: An organic electroluminescence device comprising: an anode, a cathode, and an emitting region between the anode and the cathode, wherein the emitting region comprises a first emitting layer and a second emitting layer, the first emitting layer and the second emitting layer are directly adjacent to each other, the first emitting layer is between the anode and the second emitting layer, and one of the first emitting layer and the second emitting layer comprises a compound having at least one deuterium atom.

Abstract: An organic electroluminescence device including: a cathode; an anode; and at least one emitting layer disposed between the cathode and the anode, wherein the emitting layer contains a first host material, a second host material, and a dopant material, wherein the first host material is a compound represented by the following formula (1), the second host material is a compound represented by the following formula (2), and the first host material and the second host material are different compounds.

Abstract: An organic electroluminescence device, comprising a cathode, an anode, and at least one emitting layer disposed between the cathode and the anode, wherein the emitting layer contains a first host material, a second host material, and a dopant material, wherein the first host material is a compound represented by the following formula (1), the second host material is a compound represented by the following formula (2), and one or more selected from the group consisting of the compound represented by the formula (1) and the compound represented by the formula (2) have at least one deuterium atom.

Abstract: A composition comprising a compound represented by the following formula (1) and a compound represented by the following formula (2), provided that the compound represented by the formula (1) and the compound represented by the formula (2) are different compounds:

Abstract: An organic electroluminescence device comprising: an anode, a cathode, and an emitting region between the anode and the cathode, wherein the emitting region comprises a first emitting layer and a second emitting layer, the first emitting layer and the second emitting layer are directly adjacent to each other, the first emitting layer is between the anode and the second emitting layer, and one of the first emitting layer and the second emitting layer comprises a compound having at least one deuterium atom.

Abstract: An organic electroluminescence device comprising: an anode, a cathode, and an emitting region between the anode and the cathode, wherein the emitting region comprises a first emitting layer and a second emitting layer, the first emitting layer and the second emitting layer are directly adjacent to each other, the first emitting layer is between the anode and the second emitting layer, and one of the first emitting layer and the second emitting layer comprises a compound having at least one deuterium atom.

Abstract: An organic electroluminescence device includes: an anode; a cathode; a first emitting layer, and a second emitting layer, in which the first emitting layer includes a first host material in a form of a first compound represented by a formula (1), the second emitting layer includes a second host material in a form of a second compound represented by a formula (2) and having at least one group represented by a formula (21), and the first emitting layer is in direct contact with the second emtting layer.