Abstract: To provide a practically useful organic EL device having a low voltage, high efficiency and lifetime characteristics. An organic EL device including a light-emitting layer between an anode and a cathode opposite to each other, in which the light-emitting layer contains a first host selected from a compound represented by the following general formula (1), a second host selected from a compound represented by the following general formula (2), and a light-emitting dopant material. In the general formula (1), a ring A is an aromatic ring represented by formula (Ia), a ring B is a heterocycle represented by formula (Ib), Tp represents a triphenylene group, L represents an aromatic hydrocarbon group having 6 to 18 carbon atoms, and X represents N or C—H. In the general formula (2), a ring C represents an aromatic ring represented by formula (2a) and a ring D represents a heterocycle represented by formula (2b).

Abstract: To provide an organic electroluminescent device (organic EL device) that is driven at a low voltage and that has high efficiency and lifetime characteristics. The organic EL device includes a light-emitting layer between an anode and a cathode opposed to each other, in which the light-emitting layer contains a first host selected from an indolocarbazole compound having a triphenylene ring-containing group with which an N-position of an indolocarbazole ring is directly or indirectly substituted, a second host selected from a biscarbazole compound having a structure in which two carbazole rings are linked at a carbon position, and a light-emitting dopant material.

Abstract: To provide a compound for an organic EL device which provides an organic EL device having a low driving voltage and also high efficiency and extended lifetime characteristics, and an organic EL device using the compound. The compound for an organic EL device is a compound having an indolocarbazole skeleton represented by the following general formula (1): wherein a ring A is a benzene ring, a ring B is represented by formula (1b), Tp represents a triphenylene group, L represents an aromatic hydrocarbon group having 6 to 18 carbon atoms, X represents N or C—H and at least one thereof represents N, and n represents an integer of 1 to 3.

Abstract: Provided are a donor-acceptor type compound having a novel structure and its use.

Abstract: To provide an organic electroluminescent device having long lifetime characteristics while having a low driving voltage and high power efficiency. The organic electroluminescent device includes one or more light-emitting layers between an anode and a cathode opposed to each other, wherein at least one of the light-emitting layers contains a host material including a first host material, a second host material and a third host material, and a light-emitting dopant material. A LUMO energy of the first host material is ?1.95 eV or less, and LM2?LM3?LM1 is satisfied under the assumption that LUMO energies of the first host material, the second host material and the third host material are LM1, LM2 and LM3, respectively.

Abstract: To provide an organic electroluminescent device having high efficiency while having a driving voltage. This organic electroluminescent device includes an anode, an organic layer and a cathode stacked on a substrate, at least one layer of the organic layer is a light-emitting layer containing a first host, a second host and a light-emitting dopant material, the first host is selected from a compound represented by the following general formula (1), and the second host is selected from a biscarbazole compound binding at a position other than the N-position, an indolocarbazole compound, or a carbazole compound in which a plurality of carbazole rings bind at the N-position. In the formula, a ring A is represented by formula (1b) or (1c), X represents NR, S, O, or CR2, and at least one Y represents N.

Abstract: An organic electroluminescent device having high efficiency and high driving stability, and a material suitable for the organic electroluminescent device are provided. The material for organic electroluminescent devices comprises an indolocarbazole compound represented by a general formula (1). In the formula, the ring a is represented by a formula (1a), X is NR, S, O or CR2, and Ar1 and Ar2 are an aromatic heterocyclic group represented by a formula (1b). Y is N or CR, and at least one is N. L1 is an aromatic hydrocarbon group. The material for the organic electroluminescent devices is suitable as material for the host of the light emitting layer or the hole blocking layer of organic EL devices.

Abstract: An organic electroluminescent device having high efficiency and high driving stability, and a material suitable for the organic electroluminescent device are provided. The material for organic electroluminescent devices of the present invention is an oligopyridine compound represented by the following general formula (1), and the organic electroluminescent device of the present invention includes the oligopyridine compound advantageously in a light emitting layer or a hole blocking layer. In the formula, R and R? each are hydrogen, an aliphatic hydrocarbon group, an aromatic hydrocarbon group, or an aromatic heterocyclic group; at least one of X is N; and a+b+c?3.

Abstract: Provided is an organic EL device including: a light emitting layer between an anode and a cathode facing each other, in which the light emitting layer contains a first host, a second host, and a luminescent dopant, an indolocarbazole compound represented by General Formula (1) is contained as the first host, and a biscarbazole compound or a dibenzofuran compound having a dibenzofuran or dibenzothiophene ring is contained as the second host. This organic EL device has a low drive voltage, high efficiency, and high drive stability.

Abstract: Provided is an organic EL device having a low drive voltage, high efficiency, and high drive stability, and a material for an organic electroluminescent device suitable for the organic EL device. This material for an organic EL device includes: an indolocarbazole compound represented by General Formula (1). In addition, provided is an organic electroluminescent device in which this material for an organic electroluminescent device is used as a first host and carbazole compounds are used as second hosts. Here, a ring A is a heterocyclic ring represented by Formula (Ia), L1 to L3 are a direct bond, an aromatic hydrocarbon group or an aromatic heterocyclic group, B1 to B3 represent a direct bond or a biphenyldiyl group represented by Formula (1b), and at least one of B1 to B3 is a biphenyldiyl group.

Abstract: Provided are a donor-acceptor type compound having a novel structure and its use.