Abstract: An organic electroluminescence device comprising: a cathode, an anode, and an organic layer disposed between the cathode and the anode, wherein the organic layer comprises an emitting layer and a first layer, the first layer is disposed between the cathode and the emitting layer, the emitting layer comprises a compound represented by the following formula (1), and the first layer comprises a compound represented by the following formula (BE1):

Abstract: An organic EL device includes an emitting region and a first anode side organic layer. The first anode side organic layer contains a first material. The emitting region includes a first emitting layer containing first and second host materials and a second emitting layer containing a third host material.

Abstract: An organic electroluminescence device including: a cathode, an anode, and an organic layer disposed between the cathode and the anode, wherein the organic layer comprises an emitting layer and a first layer, the first layer is disposed between the cathode and the emitting layer, the emitting layer comprises one or both of a compound represented by the following formula (1A) and a compound represented by the following formula (1B), and the first layer comprises a compound represented by the following formula (BE1):

Abstract: An organic EL device includes an emitting region provided between a cathode and an anode, a first anode-side-organic layer, a second anode-side-organic layer, and a third anode-side-organic layer, a first emitting layer of the emitting region contains a first host material, a first additional host material, and a first luminescent compound, the first anode-side-organic layer is in direct contact with the second one, the second anode-side-organic layer is in direct contact with the third one, the third anode-side-organic layer has a film thickness of 20 nm or more, the second anode-side-organic layer contains at least one compound different from a compound contained in the third one, the first emitting layer is a fluorescent emitting layer, and a refractive index NM2 of a constituent material contained in the second anode-side-organic layer and a refractive index NM3 in the third one satisfy a relationship below, NM 2 > NM 3 .

Abstract: An organic EL device includes an emitting region between a cathode and an anode, a first anode side organic layer, and a second anode side organic layer, in which the emitting region includes at least a first emitting layer, the first emitting layer contains a first host material, a first additional host material, and a first luminescent compound, the first anode side organic layer contains first and second organic materials, a content of the first organic material is less than 50 mass %, the second anode side organic layer contains a second hole transporting zone material, the first emitting layer is an emitting layer that emits fluorescence, and a refractive index NM1 of constituent materials in the first anode side organic layer and a refractive index NM2 of a constituent material in the second anode side organic layer satisfy a relationship of Numerical Formula NM, NM 1 > NM 2 .

Abstract: An organic EL device includes a first emitting layer and a second emitting layer, in which the first emitting layer contains a first host material, the second emitting layer contains a second host material, the first emitting layer at least contains a first emitting compound that emits light having a maximum peak wavelength of 500 nm or less, the second emitting layer at least contains a second emitting compound that emits light having a maximum peak wavelength of 500 nm or less, a total of a film thickness of the first emitting layer and a film thickness of the second emitting layer is 20 nm or less, 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 (Numerical Formula 1): T1(H1) greater than T1(H2).

Abstract: A mixed powder for an organic electroluminescence device, including a first organic compound and a second organic compound, and being solid at ordinary temperatures and pressures, wherein the organic electroluminescence device includes a cathode, an anode, and an emitting layer arranged between the cathode and the anode, and the emitting layer includes a compound C2 having delayed fluorescence, and each of the first organic compound and the second organic compound is a compound selected from the group consisting of a fluorescent emitting compound C1, the compound C2, and a compound C3 different from both the compound C1 and the compound C2, and they have the specific combination, wherein when MOL1 [mol %] is used as the molar concentration of the first organic compound in the mixed powder and MOL2 [mol %] is used as the molar concentration of the second organic compound in the mixed powder, MOL1 [mol %] and MOL2 [mol %] satisfy the following formula (1), wherein when M1 [kg/mol] is used as the molecular weigh

Abstract: An organic electroluminescence device including: a cathode, an anode, and an organic layer disposed between the cathode and the anode, wherein the organic layer comprises an emitting layer and a first layer, the first layer is disposed between the cathode and the emitting layer, the emitting layer comprises one or both of a compound represented by the following formula (1A) and a compound represented by the following formula (1B), and the first layer comprises a compound represented by the following formula (BE1):

Abstract: An organic electroluminescence device includes an emitting region provided between a cathode and an anode, a first anode side organic layer, a second anode side organic layer, and a third anode side organic layer, in which the emitting region includes at least one emitting layer, the second anode side organic layer contains at least one compound different from the compound contained in the third anode side organic layer, the third anode side organic layer has a film thickness of 20 nm or more, and a difference NM2?NM3 between a refractive index NM2 of a constituent material contained in the second anode side organic layer and a refractive index NM3 of a constituent material contained in the third anode side organic layer satisfies a relationship of a numerical formula (Numerical Formula N1) below, N ? M 2 - N ? M 3 ? 0 . 0 ? 5 .

Abstract: A mixed powder comprising a first compound and a second compound, wherein the first compound has the fused ring structure having the most rings and having three or more rings, in fused ring structures included therein, and the second compound has the fused ring structure having the most rings and having 5 or more rings, in fused ring structures included therein, and the fused ring structure having the most rings thereof has more rings than that of the first compound.

Abstract: Compounds of formulae (2-7) or (2-9) are provided: Also provided are organic electroluminescence (EL) devices containing the compounds having a high emission efficiency when operated at low voltage and a long lifetime and electronic devices including such organic EL devices.

Abstract: A compound represented by the following formula (A1) (X1 is O or S; two or more of Y1, Y2, and Y3 are N; and Ar1 is an aryl group including 6 to 50 ring carbon atoms, comprising a benzene ring having at least substituent Ar2 at the ortho-position; Ar2 is an aryl group; and Ar3 is a predetermined group).

Abstract: An organic electroluminescence device includes an emitting layer, in which the emitting layer includes at least one single layer containing a first host material, a second host material, and an emitting compound; the first host material and the second host material are mutually different; and a triplet energy of the first host material T1(H1), a triplet energy of the second host material T1(H2), and a triplet energy of the emitting compound T1(D) satisfy at least one of a relationship of a numerical formula (Numerical Formula 1) or a relationship of a numerical formula (Numerical Formula 2) below, T1(D)>T1(H1)??(Numerical Formula 1) T1(D2)>T1(H2)??(Numerical Formula 2).

Abstract: An organic electroluminescence device, comprising: an anode, an emitting layer, a first electron-transporting layer, a second electron-transporting layer and a cathode in this order, wherein the second electron-transporting layer comprises a compound represented by the following formula (1), and the emitting layer comprises a compound represented by the following formula (10).

Abstract: An organic EL device includes: an anode; a cathode; an emitting region; and a hole transporting zone, in which the emitting region includes a first emitting layer containing a first host material and a second emitting layer containing a second host material, at least one organic layer in the hole transporting zone is a first organic layer, the first organic layer contains a hole transporting zone material, the first emitting layer is disposed close to the anode, and a triplet energy of the first host material T1(H1) and a triplet energy of the second host material T1(H2) satisfy Numerical Formula 1, and a dipole of the first host material is 0.4 D or more, T1(H1)>T1(H2)??(Numerical Formula 1).

Abstract: The compound represented by formula (1): wherein A, B, R1, and R2 are as defined in the description, provides organic electroluminescence (EL) devices having a high emission efficiency when operated at low voltage and a long lifetime and electronic devices including such organic EL devices.

Abstract: An organic electroluminescence device may have good organic electroluminescence device performance by including a light emitting layer, a first electron transporting layer, and a second electron transporting layer from an anode toward a cathode. The first electron transporting layer may include a first compound of formula (1): A-(L)n-Ar—CN??(1).

Abstract: An organic EL device includes an emitting region provided between a cathode and an anode, a first anode-side-organic layer, a second anode-side-organic layer, and a third anode-side-organic layer, in which the emitting region includes at least a first emitting layer, the first anode-side-organic layer is in direct contact with the second anode-side-organic layer, the second anode-side-organic layer is in direct contact with the third anode-side-organic layer, the third anode-side-organic layer has a film thickness of 20 nm or more, the second anode-side-organic layer contains at least one compound different from a compound contained in the third anode-side-organic layer, the first emitting layer is a fluorescent emitting layer, and a refractive index NM2 of a constituent material contained in the second anode-side-organic layer and a refractive index NM3 of a constituent material contained in the third anode-side-organic layer satisfy a relationship of Numerical Formula NM, NM2>NM3??(Numerical Formula NM

Abstract: An organic EL device includes: an emitting layer including a first emitting layer and a second emitting layer; and a hole transporting zone including at least two organic compound layers, in which a first organic compound layer of the hole transporting zone includes a first organic material and a second organic material that are mutually different, a content of the first organic material in the first organic compound layer is less than 10 mass %, the first emitting layer includes a first host material and a first emitting compound, the second emitting layer includes a second host material and a second emitting compound, 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 Numerical Formula 1, T1(H1)>T1(H2)??(Numerical Formula 1).

Abstract: An organic electroluminescence device includes an emitting region between a cathode and an anode, a first anode side organic layer, and a second anode side organic layer. The emitting region includes at least a first emitting layer, the first anode side organic layer is in direct contact with the second anode side organic layer, the first anode side organic layer contains first and second organic materials, a content of the first organic material in the first anode side organic layer is less than 50 mass %, the second anode side organic layer contains a second hole transporting zone material, the first emitting layer is an emitting layer that emits fluorescence, and a refractive index NM1 of the constituent materials contained in the first anode side organic layer and a refractive index NM2 of the constituent material contained in the second anode side organic layer satisfy a relationship of NM1>NM2.