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 EL device having high efficiency and extended lifetime while having a low driving voltage, and a compound suitable therefor. A material for an organic electroluminescent device of the present invention is comprised of an indolocarbazole compound represented by the following general formula (1): wherein a ring A is a heterocycle represented by formula (1a); Ar1 and Ar2 each represent an aromatic hydrocarbon group, an aromatic heterocyclic group, or a linked aromatic group in which two to five of these aromatic rings are linked to each other; L1 represents an aromatic hydrocarbon group or an aromatic heterocyclic group; L2 represents an aromatic heterocyclic group; Ar3 represents a carbazolyl group; and a+b+c?1.

Abstract: To provide a practically useful organic electroluminescent device which is improved in luminous efficiency and at the same time, sufficiently secures the stability during driving. An organic electroluminescent device, wherein a light-emitting layer includes two host materials different from each other, and a dopant material, one of the host materials is a compound represented by general formula (1) and the other of the host materials is a compound represented by general formula (2). A ring A is a heterocycle represented by formula (1a), X represents N or C—Ar?, Y represents O, S, N—Ar3, or C—Ar4Ar5, and any one of Z1 to Z4 represents a carbon atom binding to a 6-membered ring containing X and the others and Z5 to Z8 each represent C—Ar? or N. Ar, Ar? and Ar1 to Ar5 each represent, for example, hydrogen, or an alkyl group having 1 to 20 carbon atoms. A ring B is a heterocycle represented by formula (2a), and Ar6 and Ar7 each represent, for example, hydrogen, or an alkyl group having 1 to 20 carbon atoms.

Abstract: To provide an organic EL device having high efficiency and extended lifetime while having a low driving voltage, and a material for an organic electroluminescent device suitable therefor. This material for an organic electroluminescent device is comprised of an indolocarbazole compound represented by the following general formula (1): [C1] wherein a ring A is a heterocycle represented by formula (1a); Ar1 and Ar2 each represent an aromatic hydrocarbon group, an aromatic heterocyclic group, or a linked aromatic group; L2 represents an aromatic heterocyclic group; Ar3 represents an aromatic hydrocarbon group or a linked aromatic group in which a plurality of these aromatic hydrocarbon groups are linked to each other; and a+b+c?1.

Abstract: Provided is an organic EL device having high efficiency and high driving stability while being driven at a low voltage. The organic electroluminescent device includes one or more light-emitting layers between an anode and a cathode opposite to each other. At least one of the light-emitting layers contains a host material and a light-emitting dopant, and (i) a first host formed of an indolocarbazole compound having one or two indolocarbazole rings, and (ii) a second host formed of a carbazole compound having a plurality of carbazole rings and having a bond structure represented by the following general formula (3) are used as the host material.

Abstract: To provide an organic electroluminescent device realizing high efficiency and low voltage characteristics. A light-emitting layer including compounds of (1) and (2) and a dopant is included. X represents N or CR3, wherein at least one X represents N. R1 represents (1b), R2 represents (1c), and R3 represents an alkyl group or the like. Y represents O, S, NR4, or CR5R6, R4 to R6 each represent an alkyl group or the like, and one of R7 to R14 binds to a ring in (1). * represents a binding position to a ring in (1), and rings C and D are each an aromatic ring fused to an adjacent ring. R15, R16 and R17 have the same meaning as R3 (a and b represent the number of substitutions). R19 has the same meaning as R4, and R20 to R27 each represent CR3, CR28 or N and at least one thereof represents CR28, and R28 represents formula (2b). Z represents O, S, NR37, or CR38R39, R37 to R39 each has the same meaning as R4, and one of R29 to R36 binds to a ring in (2) and the others represent CR3 or N.

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 high efficiency and high driving stability despite having a low driving voltage. The organic EL device has at least one light-emitting layer that is composed of a vapor deposition layer containing a first host selected from among indolocarbazole compounds represented by General Formula (1), a second host selected from among biscarbazole compounds represented by the following General Formula (2), and a light-emitting dopant material: wherein m and n represent the number of repetitions and are an integer of 0 to 4, and m+n?2 is satisfied; Ar2 and Ar3 represent an aromatic hydrocarbon group or a group in which two or three of the aromatic hydrocarbon groups are linked, and at least one is a fused aromatic hydrocarbon group.

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 is an organic electroluminescent (organic EL) element that exhibits a high efficiency while having a low drive voltage, and that exhibits a high stability while being driven. The organic electroluminescent element contains, in a light-emitting layer formed between an anode and a cathode opposing each other, a first host selected from indolocarbazole compounds represented by general formula (1), a second host selected from carbazole compounds represented by general formula (2), and a light-emitting dopant material. Here, Ar2 and Ar3 are aromatic hydrocarbon groups, L1 is a direct bond or a phenylene group, and L2 is an o-phenylene group.

Abstract: Provided is a polymer for an organic electroluminescent device, which has high luminous efficiency and high durability, and is applicable to a wet process. In an organic electroluminescent device having laminated, on a substrate, an anode, organic layers, and a cathode, a material containing the polymer for an organic electroluminescent device, which includes a polyphenylene main chain having a pentacyclic fused heterocyclic structure in a side chain thereof, is used in at least one layer of the organic layers.

Abstract: Provided is an organic electroluminescent (organic EL) element that exhibits a high efficiency while having a low drive voltage, and that exhibits a high stability while being driven. The organic electroluminescent element contains, in a light-emitting layer formed between an anode and a cathode opposing each other, a first host selected from indolocarbazole compounds represented by general formula (1), a second host selected from carbazole compounds represented by general formula (2), and a light-emitting dopant material. Here, Ar2 and Ar3 are aromatic hydrocarbon groups, L1 is a direct bond or a phenylene group, and L2 is an o-phenylene group.

Abstract: Provided is a polymer for an organic electroluminescent device, which has high luminous efficiency and high durability, and is applicable to a wet process. In an organic electroluminescent device having laminated, on a substrate, an anode, organic layers, and a cathode, a material containing the polymer for an organic electroluminescent device, which includes a polyphenylene main chain having a tricyclic fused heterocyclic structure in a side chain thereof, is used in at least one layer of the organic layers.

Abstract: The purpose of the present invention is to provide an organic EL element which exhibits high driving stability and high luminous efficiency at a low voltage. Provided is an organic electroluminescent element in which an anode, organic layers and a cathode are laminated on a substrate, wherein a biscarbazole compound (i) represented by general formula (1) and a carborane compound (ii) having one or more carborane rings and an aromatic group bonded to the carborane ring(s) are contained in at least one of the organic layers. Here, R and R? each denote a hydrogen atom, an aromatic hydrocarbon group, a heterocyclic group, an alkyl group, or the like, m is a number between 1 and 6, and X1 to X3 are each N, C—R? or C—.

Abstract: Provided is an organic electroluminescent device having high efficiency and high driving stability while being driven at a low voltage. The organic electroluminescent device is an organic electroluminescent device including a light-emitting layer between an anode and a cathode opposite to each other, in which: the light-emitting layer contains two kinds of host materials and a light-emitting dopant; and a first host material (H1) out of the two kinds of host materials is an indolocarbazole-based compound having one or two indolocarbazole rings, and a second host material (H2) out of the materials is a host material selected from carbazole-based compounds each represented by the general formula (3), the compounds each having a structure in which two carbazole rings are bonded through a six-membered aromatic ring.

Abstract: Provided is an organic EL device having high efficiency and high driving stability while being driven at a low voltage. The organic electroluminescent device includes one or more light-emitting layers between an anode and a cathode opposite to each other. At least one of the light-emitting layers contains a host material and a light-emitting dopant, and (i) a first host formed of an indolocarbazole compound having one or two indolocarbazole rings, and (ii) a second host formed of a carbazole compound having a plurality of carbazole rings and having a bond structure represented by the following general formula (3) are used as the host material.

Abstract: Provided is a homogeneous organic EL device having a low driving voltage, high luminous efficiency, and a long lifetime. The device is an organic electroluminescent device including a light-emitting layer between an anode and a cathode opposite to each other, in which: the light-emitting layer contains a host material and a light-emitting dopant material; the host material is a material obtained by preliminarily mixing two or more kinds of compounds selected from compounds each having a structure in which two nitrogen atoms of an indolocarbazole ring are each substituted with an aromatic hydrocarbon group or an aromatic heterocyclic group; and the light-emitting layer is formed by co-depositing the preliminarily mixed host material and the light-emitting dopant material in a vacuum.

Abstract: The present invention provides a method of controlling a component concentration of a plating solution in continuously electroplating a metallic strip while controlling a metal ion concentration of the plating solution. In the control method, when a total amount of the plating solution flowing in the series of devices varies from a preselected target value of the total bath amount, a feedback control target value of the metal ion concentration is controlled by changing it to a corrected target value of the metal ion concentration computed on the basis of a preselected target value of the metal ion concentration and said variation in the total amount of the plating solution so that the acid concentration or pH of the plating solution is kept constant. This method is capable of continuously electroplating a metallic strip with high efficiency and high precision.