Abstract: The present invention discloses an oligofluorene-based compound, wherein the general formula of the oligofluorene-based compound is as following: , wherein n is an integer of 0 to 3, A is polyaryl moiety or amino group, and B is amino group or hydrogen. Furthermore, the mentioned oligofluorene-based compound can be used as electro-luminescent materials or host-guest materials.

Abstract: A material for an organic electroluminescent device represented by the following formula (I): wherein X1 and X2 are independently one of specific divalent groups; Y1 to Y4 are independently a carbon atom or a nitrogen atom; R1 to R4 are independently a hydrogen atom, an alkyl group, an aryl group, a heterocyclic group, a halogen atom, a fluoroalkyl group, or a cyano group; and R1 and R2, and R3 and R4 may be bonded together to form a ring, respectively.

Abstract: It is an object to provide a novel material having a bipolar property, a light emitting element provided with the novel material, and a display device that includes the light emitting element. It is an object to provide a pyrazine derivative represented by the following general formula (g-1).

Abstract: A fluorene compound represented by the following general formula [I]: is used to provide an organic luminescent device. Such a device has an optical output exhibiting a high luminance with an extremely high efficiency, and has an extremely high durability.

Abstract: The present invention provides an organic electroluminescent device material composed of an aromatic amine derivative having a specific structure in which amine moieties are linked to a chrysene moiety; and an organic electroluminescent device having a cathode, an anode, and one or more organic thin-film layers interposed between the cathode and the anode, the organic thin-layers including at least a light-emitting layer, wherein at least one of the organic thin-film layers contains the organic electroluminescent device material in the form of single component material or a mixture of a plurality of components. The organic electroluminescent device material and the organic electroluminescent device containing the material attains a long service life and can emit blue light of high color purity at high emission efficiency.

Abstract: A novel pyrenylfluorenylene compound is provided which is represented by the general formula (1):

Abstract: Provided is an arylene derivative including a polar functional group represented by Formula 1: An arylene derivative including a polar functional group has excellent solubility in an organic solvent. A soluble compound of the arylene derivative can be used to form a thermally stable organic layer which can be used to form an organic light emitting device having low operating voltage, high efficiency, and excellent brightness.

Abstract: The present invention relates to a compound represented by formula (1), wherein each of R1 and R2, which may be identical or different, is selected from hydrogen, C1-C4 alkyl, C1-C4 alkoxy, C1-C4 alkylthio, unsubstituted C6-C12 aryl or C6-C12 aryl substituted by C1-C4 alkyl or C1-C4 alkoxy or C12-C20 diarylamino; and each of m and n is selected from an integer 0, 1, 2 or 3. The present invention also relates to an organic EL device using said compound as a dopant in at least one luminescent layer.

Abstract: The present invention provides a tetramine compound represented by the following general formula (1): wherein R1, R2 and R3, which may be the same or different, each represents a hydrogen atom, a tertiary alkyl group having 4 to 8 carbon atoms, an unsubstituted aryl group or an aryl group substituted with a tertiary alkyl group having 4 to 8 carbon atoms, and n represents 3 or 4. According to the invention, there can be provided a material suitable as a material for an organic EL element requiring luminous stability at the time of high temperature driving which has been the largest problem of the conventional organic EL element. Further, an organic EL element containing the above-mentioned tetramine compound and a method for producing the above-mentioned tetramine compound are also disclosed.

Abstract: An oxadiazole derivative represented by the following general formula (G1) is synthesized and applied to the light emitting element, wherein Am is a substituent represented by a general formula (Am1), (Am2), or (Am3); each of ?, ?1, and ?2 represents an arylene group having 6 to 25 carbon atoms; each of Ar1 to Ar6 represents an aryl group having 6 to 25 carbon atoms; each of R1 to R3 represents hydrogen, an alkyl group having 1 to 4 carbon atoms, or an aryl group having 6 to 25 carbon atoms; and R4 represents an alkyl group having 1 to 4 carbon atoms or an aryl group having 6 to 25 carbon atoms.

Abstract: An organic light-emitting material characterized in that it is used in a light emitting layer in a green light emitting element and represented by the following general formula (1): wherein: n1 is an integer of 0 to 3; R1 is an alkyl group having 10 carbon atoms or less; Ar1 is a monovalent group which is derived from monocyclic or fused-ring aromatic hydrocarbon having 20 carbon atoms or less, and which optionally has a substituent having 10 carbon atoms or less; and Ar2 is a divalent group which is derived from a ring assembly having 30 carbon atoms or less and being comprised of monocyclic or fused-ring aromatic hydrocarbon having 1 to 3 rings, and which optionally has a substituent having 4 carbon atoms or less. There can be provided an organic light-emitting material which has satisfactorily excellent light emission efficiency and high color purity as well as higher reliability and which is advantageously used to constitute a green light emitting layer, and a method for producing the same.

Abstract: An OLED device comprises a cathode, an anode and a light-emitting layer therebetween, wherein the light-emitting layer comprises a host containing an anthracene nucleus and a light-emitting material comprising a 1,3-butadiene nucleus, wherein the butadiene nucleus is substituted in the 1 and 4 positions with independently selected aromatic groups, and wherein at least one of said aromatic groups is further substituted with an amino group, and wherein said amino group is further substituted with two independently selected aryl or heteroaryl groups.

Abstract: Materials for organic electroluminescence devices are represented by following general formula [1]: wherein A represents a chrysene group, X1 to X4 each independently represent a substituted or unsubstituted arylene group having 6 to 30 carbon atoms, X1 and X2 may be bonded to each other, X3 and X4 may be bonded to each other, Y1 to Y4 each independently represent an organic group represented by general formula [2], a to d each represent an integer of 0 to 2 and, a+b+c+d?0; general formula [2] being: wherein R1 to R4 each independently represent hydrogen atom, a substituted or unsubstituted alkyl group having 1 to 20 carbon atoms, a substituted or unsubstituted aryl group having 6 to 20 carbon atoms, cyano group or form a triple bond by a linkage of R1 and R2 or R3 and R4, Z represents a substituted or unsubstituted aryl group having 6 to 20 carbon atoms and n represents 0 or 1.

Abstract: An OLED device comprises a cathode, an anode, and having therebetween a light emitting layer, the device further comprising a layer on the cathode side of the emitting layer containing an anthracene compound bearing a diarylamine group; provided either (1) there is present an organic layer contiguous to the cathode that is substantially free of an anthracene compound bearing a diarylamine group, or (2) there are present independently selected diarylamine groups in both the 9- and 10-positions of the anthracene. The invention provides an improved combination of efficiency, operational lifetime, and lower operational voltage.

Abstract: An OLED device comprises a cathode, an anode, and located therebetween a light emitting layer, the device comprising a further layer between the light-emitting layer and the anode but not contiguous to the light-emitting layer, the further layer containing a 2,6-diamino-substituted anthracene compound and containing a larger volume percentage of the 2,6-diamino-substituted anthracene compound than the layer contiguous to the light-emitting layer on the anode side.

Abstract: An organic electroluminescent device including a pair of electrodes and an emitting layer provided between the pair of electrodes, the emitting layer comprising a derivative having an unsymmetrically substituted anthracene as a partial structure and an amine derivative represented by Formula (1), wherein Ar1 to Ar4 are independently a substituted or unsubstituted aromatic ring having 6 to 50 nucleus carbon atoms, R1 and R2 may be the same or different substituents and linked to each other to form a saturated or unsaturated ring, and p is an integer of 1 to 6.

Abstract: An organic electroluminescence device emitting white light which emits white light and exhibits properties sufficient for practical applications, i.e., a high efficiency of light emission and a long life, is provided. The organic electroluminescence device emitting white light comprises a pair of electrodes and a layer of a light emitting medium disposed between the pair of electrodes, wherein the layer of a light emitting medium comprises a light emitting material emitting blue light and a fluorescent compound having at least one structure selected from a fluoranthene skeleton structure, a pentacene skeleton structure and a perylene skeleton structure.

Abstract: The present invention provides an oligofluorenylene compound represented by the general formula below, which enables production of an organic light-emitting device that exhibits an extremely pure luminescent hue and has a light emission of high efficiency, high brightness, and long lifetime.

Abstract: An organic light-emitting device, comprising a substrate; an anode and a cathode; a first hole-transport layer provided over the anode and having at least a first material; a second hole-transport layer provided over the first hole-transport layer, and having at least a second material; at least one light-emitting layer disposed over the second hole-transport layer wherein the light-emitting layer(s) includes a host, a dopant, and a hole-trapping material; an improved electron-transport layer disposed between the light-emitting layer(s) and the cathode.

Abstract: The present invention relates to an organic electroluminescent device consisting of a substrate, an anode, a hole-injecting layer, a hole-transporting layer, at least one light-emitting layer, an electron-transporting layer, an electron-injecting layer and a cathode. Said at least one light-emitting layer contains a compound of formula (1) represented by: wherein R1, R2 and R3 are an alkyl group containing 1 to 4 carbon atoms; a, b and c are integers ranging from 0 to 3.

Abstract: An OLED device comprises a cathode, an anode, and located therebetween a light-emitting layer containing a host material and a tris-CˆN-cyclometallated complex of Ir or Rh wherein at least one of the ligands comprises a substituted quinazoline moiety. The device provides useful emission and stability attributes.

Abstract: The organic light-emitting device capable of emitting light with remarkably high efficiency and luminance by using a fluorene compound having substituents is provided, and at least one layer among the organic compound layers in the device contains a first compound and a second compound, and the first compound is a fluorene compound represented by the following general formula (III) and the second compound is a compound represented by the following general formula (IV).

Abstract: A novel aromatic amine derivative having an asymmetric and specific structure, and in an organic electroluminescence device which comprises at least one organic thin film layer comprising a light emitting layer sandwiched between a pair of electrode consisting of an anode and a cathode, at least one of the organic thin film layer comprises the aromatic amine derivative singly or as its mixture component, the organic electroluminescence device having an improved success ratio on its production due to difficult crystallization of the amine derivative and exhibiting a long lifetime, and also to the aromatic amine derivative for realizing the organic EL device is provided.

Abstract: The present invention relates to compounds represented by formula (1) wherein Ar1 is a substituted or unsubstituted C6-C18 aryl group, and Ar2 is hydrogen or a substituted or unsubstituted C6-C12 aryl group; and by formula (2) wherein L is a substituted or unsubstituted C6-C14 aryl group. The present invention also relates to an organic electroluminescent device comprising said compounds. The organic electroluminescent device according to the invention has advantages of high luminous efficiency, high color purity, high thermal stability and a long operational life.

Abstract: An OLED device comprises a cathode, a light emitting layer and an anode, in that order, and comprising; (i) in the light-emitting layer at least one light emitting compound selected from amine containing monostyryl, amine containing distyryl, amine containing tristyryl and amine containing tetrastyryl compounds, and (ii) a further layer located between the cathode and the light emitting layer, containing (a) 10-volume % or more of a carbocyclic fused ring aromatic compound, and (b) at least one salt or complex of a Group IA, IIA, IIIA or IIB element of the Periodic Table. Such devices exhibit reduce drive voltage while maintaining good luminance.

Abstract: Dibenzoanthracene derivatives are each substituted by an amino compound group at at least one of 9-position and 14-position of a dibenzo[a,c]anthracene skeleton and represented by the following formula (1) or (2): wherein X1, X2 and X each independently represents a substituted or unsubstituted arylene or divalent heterocyclic group; A, B, C and D each independently represents a substituted or unsubstituted alkyl, aryl or heterocyclic group, and between the adjacent groups, may be fused together to form rings; and Y1 to Y12 and R1 each independently represents a hydrogen or halogen atom, an alkoxy group, or a substituted or unsubstituted alkyl, aryl or heterocyclic group, and, when Y1 to U12 and R1 are other than a hydrogen or halogen atom, Y1 to Y12 and R1 may be fused together between the adjacent groups to form rings.

Abstract: Disclosed is an organic electroluminescent device comprising a structure having an anode, an emitting layer, and a cathode stacked therein, wherein a fluorescent compound represented by Formula 1 is used as a emitting material of the emitting layer or used as a dopant of the emitting layer: wherein A1 and A2 are independently selected from a substituted or unsubstituted C1-C6 aliphatic group, a C6-C20 aromatic group and a C5-C19 heterocyclic group containing N, S or O, A3 is selected from a substituted or unsubstituted C1-C6 aliphatic group, a C6-C20 aromatic group, a C5-C19 heterocyclic group containing N, S or O, and a hydrogen atom, and substituents of A1, A2 and A3 are respectively one or more and the substituent is selected from the group consisting of C1-C10 alkyl, C1-C1 alkoxy, C1-C10 alkylamino, C1-C10 alkylsilyl, a halogen atom, C6-C10 aryl, C6-C10 aryloxy, C6-C10 arylamino, C6-C10 arylsilyl and a hydrogen atom.

Abstract: A hole injection layer, a hole transport layer, a mixture luminescent layer, a hole blocking layer, an electron injection layer and a cathode are formed on an anode. The mixture luminescent layer includes TCTA as a luminescent substance, Ir(ppy) as a substance emitting light through a triplet excited state, and DCJTB as a luminescent substance emitting the light of a spectral component in the wavelength range of red.

Abstract: An organic electroluminescence material of the present invention includes, in order to provide an durable organic EL device emitting light of high brightness, a compound shown by the general formula (A-I) or (B-I) (as explained in the specification) wherein, A1 to A3 which may be the same or different, are independently each a substituent shown by the general formula (A-II) (as explained in the specification): and a1, b1, and b2 are independently each an aryl group which may be substituted, a1 having at least one substituent shown by the general formula (B-II) (as explained in the specification), and b1 and b2 each having at least one substituent shown by the general formula (B-III) (as explained in the specification), and b1 and b2 may be the same of different.

Abstract: An organic electroluminescent device (1) comprising, a cathode (80), an anode (20), an emitting layer (50) provided between the cathode and the anode, and at least a first layer (30) and a second layer (40) stacked between the anode (20) and the emitting layer (50) in this order from the anode (20) side, the first layer (30) having a hole mobility of 7.0×10?4 (cm2/Vs, electric field intensity: 2.5×104 (V/cm)) or more, the second layer (40) having a hole mobility of 7.0×10?4 (cm2/Vs, electric field intensity: 2.5×104 (V/cm)) or more, and a main compound which forms the first layer (30) differing from a main compound which forms the second layer (40).

Abstract: The present invention discloses conjugated compounds containing triarylamine structural elements with a general formula ABm, wherein A is aryl moiety with or without hetero atom(s), m is integers from 2 to 4, and B is as following: wherein Ar is aryl moiety. Moreover, the conjugated compounds of the invention are used as hole transport material, hole injection material and/or as host material in organic electroluminescence devices and/or phosphorescence devices, and as hole transport material in solar cells.

Abstract: The invention provides an organo-electronic functional material comprising a tris(arylamino)benzene represented by the general formula (I) wherein A and B are each a group represented by the general formula (II) in which R is an alkyl group of 1-6 carbons or a cycloalkyl group of 5 or 6 carbon atoms and n is 0, 1, 2 or 3, and A and B may be the same or different from each other, and exhibiting a cyclic voltamogram in which a deviation of peak current of cyclic curves as measured 50 times at a sweep rate of 20 mV/s falls within ±10% of the average of peak current. The organo-electronic functional material has an opto-electronic exchanging function, a reversible oxidation-reduction property and a high glass transition temperature, and can form amorphous film in itself.

Abstract: A quinoxaline derivative expressed by the general formula (1) is provided. (Each of R1 to R12 represents one of a hydrogen atom, a halogen atom, an alkyl group, an alkoxyl group, an acyl group, a dialkyl amino group, a diarylamino group, a substituted or unsubstituted vinyl group, a substituted or unsubstituted aryl group, and a substituted or unsubstituted heterocycle group. Ar1 represents one of a substituted or unsubstituted biphenyl group and a substituted or unsubstituted terphenyl group, and Ar2 represents one of a substituted or unsubstituted phenyl group, a substituted or unsubstituted biphenyl group, a substituted or unsubstituted terphenyl group, and a substituted or unsubstituted monocyclic heterocycle group.

Abstract: This present invention provides a light emitting element comprising at least one organic layer containing a light emitting layer provided between a pair of electrodes, and in this structure, at least one layer of the at least one organic layer contains at least one compound consisting essentially of carbon, fluorine and nitrogen.

Abstract: An object of the present invention is to provide a carbazole derivative which is useful in manufacturing a substance having resistance to oxidation. Another object is to provide a carbazole derivative which is useful in manufacturing a novel material with high reliability. Still another object is to provide a material for a light emitting element with high reliability. The present invention is a carbazole derivative represented by the following general formula (1) (where each of Ar1 and Ar2 represents an aryl group having 6 to 14 carbon atoms which may include a substitute, Ar1 and Ar2 may be either the same or different, and R in the formula represents hydrogen or an alkyl group having 1 to 4 carbon atoms). In addition, the present invention is a material for a light emitting element which includes a carbazole derivative represented by the following general formula (1) as a substituent.

Abstract: It is an object of the present invention to provide an arylamine compound which has resistance to repeated oxidation reactions. The present invention provides a secondary arylamine compound represented by General Formula 1. (In the formula, Ar11 is an aryl group having 7 to 25 carbon atoms or a heteroaryl group having 7 to 25 carbon atoms. Ar12 and Ar13 may be identical or different, and are individually either an aryl group having 6 to 25 carbon atoms or a heteroaryl group having 5 to 9 carbon atoms. X is either a bivalent aromatic hydrocarbon group having 6 to 25 carbon atoms or a bivalent heterocyclic group having 5 to 10 carbon atoms.

Abstract: It is an object to provide a carbazole derivative which is useful as a raw material for forming a light-emitting element material which has resistance to repeated oxidation reactions. It is an object to provide a carbazole derivative represented by a general formula (G-1). In the general formula (G-1), each of Ar1 and Ar2 represents an aryl group having 1 to 12 carbon atoms such as phenyl, biphenyl, or naphthyl. Also, R1 represents any one of hydrogen, an alkyl group having 1 to 4 carbon atoms such as methyl, ethyl, or tert-butyl, and an aryl group having 6 to 12 carbon atoms such as phenyl, biphenyl, or naphthyl. Further, the aryl group may have a substituent, or is not required to have a substituent.

Abstract: The present invention relates to aromatic amine derivatives having a specific structure in which a substituted diphenylamino group is bonded to a pyrene structure; and organic electroluminescent devices comprising a cathode, an anode and one or plural organic thin film layers having at least a light emitting layer which are sandwiched between the cathode and the anode wherein at least one of the organic thin film layers contains the above material for organic electroluminescent devices in the form of a single substance or a component of a mixture. There are provided the material for organic electroluminescent devices exhibiting a long lifetime and a high efficiency of blue light emission, as well as the aromatic amine derivatives capable of realizing such organic electroluminescent devices.

Abstract: An organic light-emitting diode device (OLED) comprises a cathode, a light-emitting layer, and an anode in that order, in which there is located a first layer (L1) adjacent to the light-emitting layer on the anode side and a second layer (L2) adjacent to L1 on the anode side, in which: (a) layer L1 comprises a benzidine derivative (B1) having an oxidation potential of 0.8-0.9 V; and (b) layer L2 comprises a benzidine derivative (B2) having an oxidation potential greater than 0.7 V and exhibiting a glass transition temperature, Tg, of greater than 125° C.

Abstract: Diarylamino substituted compounds have the following representative formula (1): wherein Ar1 is an aromatic group containing 6-30 carbon atoms; R1, R2 R3 and R4 are identical or different substituents selected from the group consisting of alkyl containing 1-4 carbon atoms, alkoxyl containing 1-4 carbon atoms, sulfoalkyl containing 1-4 carbon atoms, dialkylamine containing 1-4 carbon atoms and halogen atom; m, n, p and q are integers ranging from 0-2. The diarylamino substituted compounds can be sublimated at a temperature more than 200° C. in vacuum environment. Without forming a liquid phase, the diarylamino substituted compounds can be cleaned out conveniently. Moreover, by using the diarylamino substituted compounds as organic material in the layers, the organic electroluminescent device has high luminescent efficiency and excellent thermal resistance so that the life-time and quality of the organic electroluminescent device are greatly improved.

Abstract: An organic electroluminescence material of the present invention includes, in order to provide an durable organic EL device emitting light of high brightness, a compound shown by the general formula (A-I) or (B-I) (as explained in the specification) wherein, A1 to A3 which may be the same or different, are independently each a substituent shown by the general formula (A-II) (as explained in the specification): and a1, b1, and b2 are independently each an aryl group which may be substituted, a1 having at least one substituent shown by the general formula (B-II) (as explained in the specification), and b1 and b2 each having at least one substituent shown by the general formula (B-III) (as explained in the specification), and b1 and b2 may be the same of different.

Abstract: To provide an organic electroluminescence device having high emission luminance, high heat resistance, excellent high-temperature storage stability, and a long lifetime, and an aromatic amine derivative for realizing the device. Provided are a novel aromatic amine derivative having a specific structure and an organic electroluminescence device including: a cathode; an anode; and one or multiple organic thin film layers including at least a light-emitting layer, the one or multiple organic thin film layers being interposed between the cathode and the anode, in which at least one layer of the one or multiple organic thin film layers contains the aromatic amine compound alone or as a component of a mixture.

Abstract: A compound of formula (I), where x is 3, 2 or 1, y is 0 or 1, n1 and n2, which may be the same or different, are 0 or 1 to 3, X represents a divalent mono- or poly-aromatic and/or heteroaromatic moiety, the or each Y, which may be the same or different if x is 1, represents hydrogen or an optionally substituted hydrocarbon group, Z represents an aromatic group, or an inherently at least partly conjugated dendritic molecular structure comprising one or more aromatic and/or heteroaromatic groups and, optionally, alkenylene groups, connected to each other either directly or via a carbon atom of an alkenylene group, if present, to a ring carbon atom of an (hetero) aromatic group to which more than one at least partly conjugated dendritic chain is attached, said molecular structure being connected to the remainder of the molecule via a ring carbon atom, one or more of the (hetero) aromatic rings of the dendrimers optionally being substituted, Z and/or the remainder of the molecule, excluding any groups Y, bei

Abstract: An aminostyryl compound represented by Formula 1: The organic light emitting device using the aminostyryl compound exhibits low driving voltage and improved brightness, efficiency, and color purity.

Abstract: An electroluminescent device includes an anode, a cathode and at least one organic layer sandwiched between the anode and the cathode, the organic layer including a light-emitting layer which includes compound C1.

Abstract: Novel styryl compounds represented by the following general formulae (1) and (2): wherein R1 to R10 each independently represent hydrogen atom, an alkyl group, an alkoxyl group, an aryl group, an aryloxyl group, a condensed polycyclic group, a heterocyclic group, amino group, an alkylamino group, an arylamino group, cyano group, nitro group, hydroxyl group or a halogen atom, adjacent groups among groups represented by R1 to R10 may be bonded to each other and form a saturated or unsaturated carbon ring, and A, B, C, D, A?, B?, C? and D? each independently represent a substituted or unsubstituted alkyl group or aryl group having a specific structure; and an organic electroluminescence device comprising a film of organic compounds comprising at least a light emitting layer, wherein at least one of the layers of the film of organic compounds comprises the novel styryl compound.

Abstract: Provided are an organic light-emitting device that includes a light-emitting layer interposed between a first electrode and a second electrode and a method of manufacturing the same. The light-emitting layer includes a mixed host of a naphthyl anthracene-based compound and a bianthracene-based compound and a dopant. The use of the mixed host of a naphthyl anthracene-based compound and a bianthracene-based compound and a dopant to form the light-emitting layer results in trapping of charges in the light-emitting layer. As a result, the organic light-emitting device is more stabilized and thus has a longer lifetime, excellent color characteristics, and high efficiency.

Abstract: A aromatic amine derivative having an specific structure having a diphenyl amino group, and two or more of substituent bonding to benzene ring thereof, and in an organic electroluminescence device which comprises at least one organic thin film layer comprising a light emitting layer sandwiched between a pair of electrode consisting of an anode and a cathode, at least one of the organic thin film layer comprises the aromatic amine derivative singly or a component for a mixture thereof. The organic electroluminescence device exhibiting a long lifetime and high current efficiency as well as emitting blue light with high color purity, and also the aromatic amine derivative for realizing the organic EL device are provided.

Abstract: An organic electroluminescent element including one or more organic compound layers including at least one luminescent layer between an anode and a cathode, wherein the luminescent layer includes at least two host compounds and at least two phosphorescent materials, and the phosphorescent materials include a phosphorescent material (D1) that satisfies at least one of the following conditions: (a) when the ionization potential of the phosphorescent material (D1) is defined as Ip(D1) and the minimum value out of the ionization potentials of the at least two host compounds as Ip(H)min, ?Ip1 as defined by ?Ip1=Ip(D1)?Ip(H)min satisfies ?Ip1<0 eV, and (b) when the electron affinity of the phosphorescent material (D1) is defined as Ea(D1) and the maximum value out of the electron affinities of the at least two host compounds as Ea(H)max, ?Ea1 as defined by ?Ea1=Ea(H)max?Ea(D1) satisfies ?Ea1<0 eV.

Abstract: An aromatic amine derivative with a specified structure whose benzene ring is bonded with a cycloalkyl group. An organic electroluminescence device which comprises at least one organic thin film layer comprising a light emitting layer sandwiched between a pair of electrode consisting of an anode and a cathode, wherein at least one of the organic thin film layer comprises the aromatic amine derivative singly or in combination. The organic EL device employing the aromatic amine derivative reveals practically sufficient luminance even under low applied voltage, exhibits an enhanced efficiency of light emission, and is resistant to degrade even after a long time usage demonstrating a prolonged lifetime.