Abstract: A light-emitting element having excellent light-emitting properties and with which it is possible to emit blue light at a high luminance for a long period of time, and an iridium complex for realizing the same. The light-emitting element has an external quantum efficiency of at least 5% and a light emission maximum wavelength &lgr;max of no more than 500 nm. Further, there is provided a light-emitting element including a light-emitting layer or a plurality of organic compound layers having the light-emitting layer, with at least one of the compound layers including at least one kind of a compound having a partial structure represented by the general formula K-0. In the general formula K-0, R1 to R7 each independently represents a hydrogen atom or a substituent, provided that if R2 is a fluorine atom, R3 is not a hydrogen atom.

Abstract: A concentrated fixing solution which includes at least a thiosulfate, a water-soluble aluminum salt, and a compound having an absorbance of from 0.25 to 1.15 by a prescribed colorimetric method, and does not substantially contain a boron compound is disclosed. A method for processing a silver halide photographic material by using the concentrated fixing solution is also described.

Abstract: A concentrated fixing solution which includes at least a thiosulfate, a water-soluble aluminum salt, and a compound having an absorbance of from 0.25 to 1.15 by a prescribed colorimetric method, and does not substantially contain a boron compound is disclosed. A method for processing a silver halide photographic material by using the concentrated fixing solution is also described.

Abstract: An organic electroluminescence device material and an organic electroluminescence device containing the material. The organic electroluminescence device material is a metal complex of a compound represented by formula (I) and a metal ion: wherein R1 represents a hydrogen atom or a substituent; R2 represents a hydrogen atom, an aliphatic hydrocarbon group, an aryl group or a heterocyclic group; Z represents an atomic group necessary for forming a 5- or 6-membered ring; and M represents a hydrogen atom or a cation.

Abstract: An organic electroluminescent element material, which is a compound represented by the following formula (I): ##STR1## wherein R.sub.1, R.sub.2, R.sub.3, R.sub.4, R.sub.5, and R.sub.6 each represents a hydrogen atom or a substituent; Z represents a group of atoms necessary for forming a five- or six-membered ring; R.sub.0 represents an aliphatic hydrocarbon group, an aryl group, or a heterocyclic group; n represents 0 or 1; L.sub.1 and L.sub.2 each represents a methine group or a substituted methine group, provided that plural L.sub.1 's, plural L.sub.2 's, or L.sub.1 and L.sub.2 as a whole may form a four- to six-membered ring formed through substituents thereof; m represents 0, 1, 2, or 3; Q represents a hydrogen atom, an aliphatic hydrocarbon group, an aryl group, or a heterocyclic group, provided that Q may be bonded to R.sub.0 to form a ring; X.sup.- represents an anion; and r represents an integer of 0 or larger, provided that r is 0 when the compound forms an intramolecular salt.

Abstract: The invention provides a photothermographic material comprising a photosensitive silver halide, an organic silver salt, a reducing agent, and a binder on a support. A layer containing the organic silver salt has been formed by using a solid particle dispersion of the organic silver salt and a polymer latex as a main binder, preparing a coating solution of the salt and the binder in an aqueous solvent, and coating the solution, followed by drying. Coating operation is easy, and coating surface quality and photographic properties are improved.

Abstract: A photothermographic material contains an organic silver salt, a photosensitive silver halide, a reducing agent, a binder, and a compound of the formula: X--L.sub.1 --D wherein D is an electron donative group of atoms, X is an adsorption promoting group to silver halide, and L.sub.1 is a valence bond or a linking group. It has high sensitivity in the red to infrared region and experiences a minimal change of photographic properties under different developing conditions.

Abstract: A polyhalomethane compound represented by the following formula and a silver halide photosensitive material containing the same are disclosed. ##STR1## (Q.sub.1 represents a 1,2,4-triazole ring, etc., Z.sub.1 and Z.sub.2 each represents a halogen atom, Y represents --SO.sub.2 --, etc., and A represents a halogen atom, etc.)The polyhalomethane compound is useful as a highly active antifoggant which enables photosensitive materials, especially of the heat development type, to have excellent raw-stock storage stability and image storage stability when stored in a stacked state, without reducing sensitivity nor impairing color tone.

Abstract: A recording medium comprising a support having thereon a recording layer comprising an organic silver salt, a developing agent for the organic silver salt, a water-soluble binder and an antifoggant in an amount of from 10 mol % to 40 mol % based on the organic silver salt. The recording material has a long shelf life and provides a high-density image.

Abstract: A photothermographic material comprising (a) a reducible silver source, (b) a photocatalyst, (c) a reducing agent, (d) a binder, and (e) a compound represented by the following formula (I): wherein Q represents an atomic group necessary to form a six-membered heterocycle containing two to four nitrogen atoms; Y represents --CO--, --SO--, or --SO.sub.2 --; X.sub.1 and X.sub.2 each represent a halogen atom; and A represents a hydrogen atom or an electron withdrawing group, the photothermographic material exhibiting low fogging without deterioration in image tone and sensitivity decrease.

Abstract: A photothermographic material has a photosensitive layer containing a binder, organic silver salt, reducing agent, and silver halide on one surface of a support. The photosensitive layer further contains a specific sulfur-containing compound and a merocyanine dye of specific structure and has an absorbance of 0.15-1.0 at an exposure wavelength. Sharpness, sensitivity, and aging stability are improved.

Abstract: A photothermographic material contains a compound of formula (I): ##STR1## wherein X represents --N.dbd., --N(R)--, --O--or --S--wherein R represents hydrogen, hydroxy, aliphatic hydrocarbon, aryl or heterocyclic group, Z represents a valence bond or a group of non-metallic atoms necessary to form a 5 to 7-membered ring with X, and each of Q.sub.1 and Q.sub.2 represents a group of non-metallic atoms necessary to form an aromatic hydrocarbon ring or aromatic heterocycle fused to the ring completed by Z. The material has high sensitivity in the infrared region and a minimal sensitivity change with varying storage conditions.

Abstract: A novel process and processing composition for processing a silver halide photographic material is disclosed. The processing composition is an aqueous solution of a ferric (III) complex salt of an ?S,S! optical isomer of a compound represented by formula (I): ##STR1## wherein R.sub.1, R.sub.2, R.sub.3, R.sub.4, R.sub.5 and R.sub.6 each represents a hydrogen atom, an aliphatic group, an aromatic group or a hydroxyl group; W represents a divalent linking group containing carbon atoms; and M.sub.1, M.sub.2, M.sub.3 and M.sub.4 each represents a hydrogen atom or a cation. The processing composition is useful for bleaching a silver halide color photographic material. A process for processing a silver halide color photographic material is further disclosed, employing the above described process composition containing a ferric (III) complex salt of the compound of formula (I) as a bleaching agent.

Abstract: The present invention provides a heat-developable photographic light-sensitive material which can give a high contrast image. A novel heat-developable photographic light-sensitive material is provided, comprising at least one compound represented by formula (I): ##STR1## wherein Z represents a non-metallic atom group necessary for the formation of a nitrogen-containing heterocyclic group.

Abstract: To achieve superior desilvering property and reduced stains even with the use of a biodegradable bleaching agent in a dilute concentration, the processing is conducted with a processing solution comprising a ferric complex salt of the compound of formula (I) or (II) and, for example, a 2-carboxypyridyl and having bleaching ability. (In the formulae, R.sub.1 to R.sub.5 represent, for example, a hydrogen atom or a carboxyl group, L.sub.1 to L.sub.5 represent, for example, an alkylene group, G.sub.1 and G.sub.2 represent, for example, a carboxyl group or an aryl group and X represents, for example, a hydrogen atom).

Abstract: An image formation method by silver salt diffusion transfer is described, which comprises subjecting a photosensitive element containing at least one photosensitive silver halide emulsion layer to image exposure, then developing the photosensitive element by use of an alkali processing composition containing a solvent for a silver halide to turn at least a part of unexposed silver halide of the photosensitive silver halide emulsion layer into a transferable silver complex salt, transferring at least a part of the transferable complex salt to a silver precipitating nucleus-containing image receiving layer to form an image on the silver precipitating nucleus-containing image receiving layer, and separating the silver precipitating nucleus-containing image receiving layer from the photosensitive element after image formation to obtain the image, wherein the image is formed in the presence of at least one compound represented by the following formula (I) and at least one compound represented by the following form

Abstract: A silver halide photographic material is disclosed, which comprises a support and at least one light-sensitive silver halide emulsion layer formed thereon, said emulsion layer containing at least one nucleating agent represented by formula (I) ##STR1## wherein A.sub.1 and A.sub.2 both represent a hydrogen atom, or one of A.sub.1 and A.sub.2 represents a hydrogen atom and the other represents a sulfinic acid residue or an acyl group; R.sub.1 represents an aliphatic group, an aromatic group, or a heterocyclic group; R.sub.2 represents a hydrogen atom, an alkyl group, an aryl group, an alkoxy group, an aryloxy group, or an amino group; G represents a carbonyl group, a sulfonyl group, a sulfoxy group, a phosphoryl group, or an iminomethylene group; and Y represents a phenylene group or a naphthylene group; the sum of the total carbon atoms of said R.sub.1, R.sub.2, and Y being at least 13. The nucleating agent provides very high contrast images when used in a negative working silver halide emulsion.

Abstract: Photographic processing using an additive represented by formula (I): ##STR1## wherein R.sub.1 is an aliphatic hydrocarbon group, an aryl group, or a heterocyclic ring group; R.sub.2 is hydrogen, an aliphatic hydrocarbon group, an aryl group, or a heterocyclic ring group; L.sub.1, L.sub.2, L.sub.3, L.sub.4 and L.sub.5 are independently an alkylene group; m and n are independently 0 or 1; W.sup.1 and W.sup.2 are independently an alkylene group, an arylene group, aralkylene group or a divalent nitrogen-containing heterocyclic ring group; D is a single bond, --O--, --S-- or --N(R.sub.w), where R.sub.2 is hydrogen, an aliphatic hydrocarbon group or an aryl group; v is 0 or an integer or from 1 to 3; w is an integer of from 1 to 3; and M.sub.1, M.sub.2, M.sub.3 and M.sub.4 are independently hydrogen or a cation.

Abstract: A process for producing a graphite block from a plurality of graphitizable polymer films or a plurality of carbonaceous films separately obtained from graphitizable polymer films is described. The method comprises superposing the plurality of the graphitizable polymer films or the plurality of the carbonaceous films, and thermally treating the plurality of the graphitizable polymer films or the plurality of the carbonaceous films in a substantially compression pressure-free condition when the treating temperature is in the thermal carbonization temperature range and the graphitization temperature range and under compression pressures in temperature ranges between the thermal carbonization temperature and the graphitization temperature ranges and over the graphitization temperature range. The compression pressure over the graphitization temperature range should be higher than that in the range between the thermal carbonization and graphitization temperature ranges.

Abstract: A reducer containing a ferric chelate compound of an amino compound and further containing an reduction accelerator and/or a complex-forming agent and a dye. ##STR1## wherein A.sub.41, A.sub.42 and A.sub.43 each individually represents a carboxyl group, a phosphono group, a sulfo group or a hydroxyl group; L.sub.41 and L.sub.42 each individually represents a divalent coupling group containing an aliphatic group, an aromatic group, a heterocyclic group or combinations thereof; R.sub.41 represents a substituent; and a represents 0, 1, 2, 3 or 4. The reducer is superior in the rate of reduction, reducibility and reduction working properties and so stable that no precipitate will separate out with time. Also disclosed is a silver image reducing method wherein a silver image formed by exposing and developing a silver halide photosensitive material is reduced in the presence of the above-described reducer. The reducer and the reducing method are suitable for application to high-contrast photosensitive materials.