Abstract: An organic light-emitting device having a layer 10 containing a delayed blue fluorescent material, a layer 11 containing separately or together a green fluorescent material and a red fluorescent material, and a spacer layer 12 arranged between the layer 10 and the layer 11 can efficiently emit white color.

Abstract: A compound represented by D-A-D is useful as a light emitter for an organic electroluminescent device:

Abstract: A delayed fluorescence material containing a mixture of an acceptor compound and a donor compound that satisfies the following formulae (1) to (4): T1A?S1>0.2 eV??(1) T1D?S1?0.2 eV??(2) |LUMOA|>2.0 eV??(3) |HOMOD|?5.3 eV??(4) wherein T1A represents the excited triplet energy of the acceptor compound; T1D represents the excited triplet energy defined of the donor compound; S1 represents the excited singlet energy of the exciplex; LUMOA represents the energy level of LUMO of the acceptor compound; and HOMOD represents the energy level of HOMO of the donor compound.

Abstract: A compound represented by (Tr)n-Z is useful as a host material for delayed fluorescent materials. Tr represents a substituted or unsubstituted triphenylenyl group, and plural Tr's existing in the general formula (1) may be the same as or different from each other. Z represents a carbonyl group or a substituted or unsubstituted, n-valent aromatic hydrocarbon group. n represents an integer of 2 to 6, but when Z is a carbonyl group, n is 2.

Abstract: A compound represented by the general formula (1) is useful as a light-emitting material. In the general formula (1), Ar1 to Ar3 each represent a substituted or unsubstituted aryl group, provided that at least one of Ar1 to Ar3 each represent a carbazolyl group having an N-position substituted with a group containing an electron withdrawing group.

Abstract: An organic compound having an excellent electron injection and transport performance is provided as a material for a low-power-consumption organic electroluminescent device. A low-power-consumption organic electroluminescent device is also provided by using the compound. The compound is a compound of general formula (1) or (2) having a substituted bipyridyl and triphenylene ring structure. The organic electroluminescent device includes a pair of electrodes, and one or more organic layers sandwiched between the pair of electrodes, and uses the compound as constituent material of at least one of the organic layers.

Abstract: An organic light-emitting device having a light-emitting layer containing a compound represented by the general formula below has a high light emission efficiency. In the general formula, at least one of R1 to R5 represents a cyano group, at least one of R1 to R5 represents a 9-carbazolyl group, a 1,2,3,4-tetrahydro-9-carbazolyl group, a 1-indolyl group or a diarylamino group, and the balance of R1 to R5 represents a hydrogen atom or a substituent.

Abstract: An organic light-emitting device containing a compound having a lone electron pair and a ? electron orbital, the compound emitting fluorescent light by such a mechanism that when at least apart of electrons constituting the lone electron pair is excited to an excited triplet state 3n?* through n?* transition, the part of electrons undergoes inverse intersystem crossing from the excited triplet state 3n?* to an excited singlet state 1n?*, and returns from the excited singlet state 1n?* to the ground state, at which the fluorescent light is emitted. The organic light-emitting device has a high light emission efficiency.

Abstract: A high light emission efficiency can be achieved by the use of a compound represented by the general formula (1) as a host material or a light-emitting material of a light-emitting layer of an organic light-emitting device. X1 to X12 each independently represent C or BH constituting carborane, provided that among X1 to X12, the bonding positions to A and D each represent C, and the other thereof each represent BH; A represents an acceptor bonded to the carborane through an aromatic ring or a heteroaromatic ring; and D represents a donor bonded to the carborane through an aromatic ring or a heteroaromatic ring.

Abstract: The present invention provides a thermoelectric conversion material having a low thermal conductivity and having an improved figure of merit, and a method for producing it. The thermoelectric conversion material has, as formed on a substrate having a nano-level microporous nanostructure, a thermoelectric semiconductor layer prepared by forming a thermoelectric semiconductor material into a film, wherein the substrate is a block copolymer substrate formed of a block copolymer that comprises a polymethyl methacrylate unit and a polyhedral oligomeric silsesquioxane-containing polymethacrylate unit, and the thermoelectric semiconductor material is a p-type bismuth telluride or an n-type bismuth telluride. The production method comprises a substrate formation step of forming the nanostructure-having block copolymer substrate, and a film formation step of forming a p-type bismuth telluride or an n-type bismuth telluride into a film to thereby provide a thermoelectric semiconductor layer.

Abstract: An organic compound having an excellent electron injection and transport performance is provided as a material for a low-power-consumption organic electroluminescent device. A low-power-consumption organic electroluminescent device is also provided by using the compound. The compound is a compound of general formula (1) or (2) having a substituted bipyridyl and triphenylene ring structure. The organic electroluminescent device includes a pair of electrodes, and one or more organic layers sandwiched between the pair of electrodes, and uses the compound as constituent material of at least one of the organic layers.

Abstract: A compound represented by the following general formula is useful as a light emitting material. X represents an oxygen atom or a sulfur atom. R1 to R8 represent a hydrogen atom or a substituent, provided that at least one of R1 to R8 is a carbazolyl group, etc.

Abstract: An organic light-emitting device containing a host material, a delayed fluorescent material and a light-emitting material satisfying ES1(H)>ES1(F)>ES1(D) has a high light emission efficiency. ES1(H) represents a lowest excited singlet energy level of the host material, ES1(F) represents a lowest excited singlet energy level of the delayed fluorescent material, and ES1(D) represents a lowest excited singlet energy level of the light-emitting material.

Abstract: A compound represented by the general formula (1) is useful as a light-emitting material. In the general formula (1), Ar1 to Ar3 represent an aryl group, provided that at least one thereof represents an aryl group substituted by a group represented by the general formula (2). In the general formula (2), R1 to R8 represent a hydrogen atom or a substituent; Z represents O, S, O?C or Ar4—N; and Ar4 represents an aryl group.

Abstract: An organic electroluminescence element in which a compound represented by the general formula below is used in a light-emitting layer exhibits a high emission efficiency and is inexpensive to provide. At least one of R1 to R8 and R17 represent an electron-donating group and the others represent a hydrogen atom; at least one of R9 to R16 represent an electron-withdrawing group that does not have an unshared electron pair at the ?-position thereof and the others represent a hydrogen atom; Z represents a single bond or >C?Y; Y represents O, S, C(CN)2 or C(COOH)2; provided that when Z is a single bond, then at least one of R9 to R16 is an electron-withdrawing group that does not have an unshared electron pair at the ?-position thereof.

Abstract: A compound that emits fluorescence and delayed fluorescence is provided as a material for an organic electroluminescent device of high efficiency, and an organic photoluminescent device and an organic electroluminescent device of high efficiency and high luminance are provided using this compound. The compound of general formula (1) having a tetraazatriphenylene ring structure is used as a constituent material of at least one organic layer in an organic electroluminescent device that includes a pair of electrodes, and one or more organic layers sandwiched between the pair of electrodes.

Abstract: A compound represented by the following formula (1) is useful as a charge transporting material. R1 to R6 represent a group represented by the formula (2), R7 represents an aryl group or an aralkyl group, and R11 to R15 represent a hydrogen atom or a substituent.

Abstract: An organic light-emitting device having a compound represented by the following general formula in a light-emitting layer thereof has a high light emission efficiency. R1 to R5 each independently represent a hydrogen atom or a substituent having a Hammett ?p value of 0 or more. R6 to R20 each independently represent a hydrogen atom or a substituent, provided that at least one of R6 to R20 represents a substituted or unsubstituted N,N-diarylamino group. m represents 1 or 2.

Abstract: A compound represented by the general formula (1) is useful as a light-emitting material. In the general formula (1), Ar1 to Ar3 each represent a substituted or unsubstituted aryl group, provided that at least one of Ar1 to Ar3 each represent a carbazolyl group having an N-position substituted with a group containing an electron withdrawing group.

Abstract: A compound that emits fluorescence and delayed fluorescence is provided as a material for an organic electroluminescent device of high efficiency, and an organic photoluminescent device and an organic electroluminescent device of high efficiency and high luminance are provided using this compound. The spiro compound of a general formula (1) having an azafluorene ring structure is used as a constituent material of at least one organic layer in an organic electroluminescent device that includes a pair of electrodes, and one or more organic layers sandwiched between the pair of electrodes.