Abstract: A method of producing inorganic semiconductor- and phosphor-primary particles, which each comprises forming the particles by reacting at least one kind of precursor solution of the inorganic primary particle in a solvent, of which major component is water of a reacting vessel, under the conditions that the pressure is 0.2 to 20 MPa and the temperature is 120° C. to 370° C.; and inorganic semiconductor- and phosphor-primary particles produced by the method.

Abstract: Disclosed is EL phosphor powder which contains phosphor particles that comprise zinc sulfide as the matrix thereof and contain an activator and a co-activator, wherein at least 30% of the projected area of the phosphor particles contained in the EL phosphor powder are those having an aspect ratio (length of major axis/length of minor axis) of at least 1.5. The EL phosphor powder emits light of higher brightness.

Abstract: Disclosed is EL phosphor powder which contains phosphor particles that comprise zinc sulfide as the matrix thereof and contain an activator and a co-activator, wherein at least 30% of the number of the phosphor particles contained in the EL phosphor powder are those having an aspect ratio (length of major axis/length of minor axis) of at least 3. EL devices comprising the EL phosphor powder enable bright light emission.

Abstract: A method of producing inorganic semiconductor- and phosphor-primary particles, which each comprises forming the particles by reacting at least one kind of precursor solution of the inorganic primary particle in a solvent, of which major component is water of a reacting vessel, under the conditions that the pressure is 0.2 to 20 MPa and the temperature is 120° C. to 370° C.; and inorganic semiconductor- and phosphor-primary particles produced by the method.

Abstract: The mixing state of static mixing is optimized, so that it is possible to form silver halide emulsion particles in small sizes with an excellent mono-dispersion characteristic. An aqueous solution of haloid salt is blown out from a first nozzle into a mixing chamber as a rectilinear flow of turbulent flow, and before eddy viscosity formed when the rectilinear flow is blown out from the first nozzle of a small diameter to the mixing chamber of a greater diameter reaches a maximum, or before a maximum flow speed of the rectilinear flow is reduced to {fraction (1/10)} or below, an aqueous solution of silver nitrate is blown out from a second nozzle as a crossflow of turbulent flow which crosses the rectilinear flow at a substantially right angle and is entrained by the rectilinear flow, so that the two solutions are allowed to mix and react with each other instantaneously, and a liquid resulting from the mixing and reaction is discharged from a discharge duct.

Abstract: An electroluminescence phosphor, containing zinc sulfide particles that have an average particle size of 20 &mgr;m or less, of which a distribution of particle size is a monodispersion, and which have a multi-twin crystal structure therein.

Abstract: Disclosed is EL phosphor powder which contains phosphor particles that comprise zinc sulfide as the matrix thereof and contain an activator and a co-activator, wherein at least 30% of the projected area of the phosphor particles contained in the EL phosphor powder are those having an aspect ratio (length of major axis/length of minor axis) of at least 1.5. The EL phosphor powder emits light of higher brightness.

Abstract: A silver halide emulsion comprising tabular grains having a very small thickness with the main surfaces thereof having a very large surface area and being (111) face, is disclosed. More specifically, a silver halide emulsion is disclosed, comprising light-sensitive silver halide grains having a silver bromide content of 70 mol % or more, with 60 % or more of the entire projected area of said silver halide grains being occupied by tabular grains having an average grain thickness of less than 0.04 &mgr;m, an average equivalent-circle diameter of 4 &mgr;m or more, and (111) face as main surfaces.

Abstract: Disclosed is EL phosphor powder which contains phosphor particles that comprise zinc sulfide as the matrix thereof and contain an activator and a co-activator, wherein at least 30% of the number of the phosphor particles contained in the EL phosphor powder are those having an aspect ratio (length of maj or axis/length of minor axis) of at least 3. EL devices comprising the EL phosphor powder enable bright light emission.

Abstract: The mixing state of static mixing is optimized, so that it is possible to form silver halide emulsion particles in small sizes with an excellent mono-dispersion characteristic. An aqueous solution of haloid salt is blown out from a first nozzle into a mixing chamber as a rectilinear flow of turbulent flow, and before eddy viscosity formed when the rectilinear flow is blown out from the first nozzle of a small diameter to the mixing chamber of a greater diameter reaches a maximum, or before a maximum flow speed of the rectilinear flow is reduced to {fraction (1/10)} or below, an aqueous solution of silver nitrate is blown out from a second nozzle as a crossflow of turbulent flow which crosses the rectilinear flow at a substantially right angle and is entrained by the rectilinear flow, so that the two solutions are allowed to mix and react with each other instantaneously, and a liquid resulting from the mixing and reaction is discharged from a discharge duct.

Abstract: A process for producing a silver halide emulsion is disclosed, which comprises disposing a mixer equipped with a first channel and a second channel brought into partial contact therewith; and allowing a silver salt solution (Fluid 1) and a halide solution (Fluid 2) to pass through said first channel and said second channel, respectively, to thin said two fluids into lamellae having an open interface therebetween and having a thickness of 1 to 500 &mgr;m in a normal line direction on the contact interface, thereby inducing diffusion, transfer and reaction of silver ions and halogen ions between said two thin layers, and thus forming silver halide grains continuously.

Abstract: A process for producing a silver halide emulsion is disclosed, which comprises disposing a mixer equipped with a first channel and a second channel brought into partial contact therewith; and allowing a silver salt solution (Fluid 1) and a halide solution (Fluid 2) to pass through said first channel and said second channel, respectively, to thin said two fluids into lamellae having an open interface therebetween and having a thickness of 1 to 500 &mgr;m in a normal line direction on the contact interface, thereby inducing diffusion, transfer and reaction of silver ions and halogen ions between said two thin layers, and thus forming silver halide grains continuously.

Abstract: A silver halide emulsion comprising tabular grains having a very small thickness with the main surfaces thereof having a very large surface area and being (111) face, is disclosed.

Abstract: The present invention provides a silver halide emulsion comprising triangular tabular grains having an extremely small thickness, an extremely high aspect ratio and (111) face as a main plane. A novel silver halide photographic emulsion is provided comprising triangular tabular grains having (111) face as a main plane and a silver bromide content of 70 mol-% or more incorporated therein in a proportion of 60% or more of all silver halide grains contained therein as calculated in terms of projected area, the triangular tabular grains each having a thickness of less than 0.05 &mgr;m and an equivalent circle diameter of 0.6 &mgr;m or more as calculated in terms of circle.

Abstract: Disclosed is a silver halide photographic material having at least one silver halide emulsion layer containing a silver halide photographic emulsion, wherein the silver halide photographic emulsion comprises spectrally sensitized tabular silver halide grains having an average aspect ratio of from 8 to 100, and having light absorption strength by a sensitizing dye per unit surface area of the grain surface of 100 or more.

Abstract: A method for producing a light-sensitive silver halide photographic emulsion is disclosed, comprising (a) a step of forming silver halide grain nuclei containing twin grain nuclei in a dispersion medium solution, (b) a step of ripening said grain nuclei to preferentially remain tabular grain nuclei, and (c) a step of growing said tabular grain nuclei into tabular grains to form a tabular silver halide grain, wherein in step (a), a silver halide nucleus having a chloride content of 10 mol % or more based on the amount of silver contained in the nucleus is formed, and the tabular silver halide grain obtained through steps (a), (b) and (c) has a Br content of 50 mol % or more based on the total silver amount.

Abstract: A method for producing a silver halide emulsion is disclosed, which comprises:supplying a water-soluble silver salt aqueous solution and a water-soluble halide aqueous solution from solution-feeling ports provided in a closed type stirring tank of a mixing vessel,controlling the stirring condition of the mixture of aqueous solutions supplied by rotation-driving at least one pair of stirring blades having no rotary shaft protruding the wall of the stirring tank, which are disposed in said stirring tank;discharging silver halide fine grains which are formed with the completion of the stirring process from a solution-discharging port provided in a closed type stirring tank; andsupplying said silver halide fine grains to a reaction vessel where nucleation and/or grain growth of silver halide grains are conducted, and further a silver halide photographic emulsion comprising a dispersion medium and silver halide grains produced by the above method is disclosed.

Abstract: A silver halide photographic emulsion is disclosed, which comprises core/shell type tabular silver halide grains having a diameter/thickness ratio of at least 2 and (111) faces as parallel main planes; wherein at least 30%, on a projected area basis, of the total silver halide grains are tabular grains which contain in their individual shells at least 15 dislocation lines reaching to the grain edges from the interface of the core and the shell and have the ratio of the shell part containing dislocation lines to the core, on a projected area basis, in the range shown as the shaded part in FIG. 1, thereby ensuring high sensitivity and high sharpness.

Abstract: Disclosed is a silver halide photographic material comprising a support having thereon at least one light-sensitive silver halide emulsion layer, wherein the silver halide emulsion is produced in the presence of a polyalkylene oxide group-containing organopolysiloxane. The emulsion being produced in the presence of the defoaming agent is prevented from being foamed in a stirrer rotating at an elevated rotation speed. The stirring performance of the stirrer is enlarged, and the conditions for forming the silver halide grains can be controlled more uniformly. The photographic properties of the emulsion are improved and it is easy to scale up the production of the emulsion.

Abstract: A silver halide photographic material comprises a support and a light-sensitive layer provided thereon. The light-sensitive layer contains silver halide grains dispersed in gelatin. A hexa-coordinated cyano-complex is doped in the silver halide grains. The amount of the complex is in the range of 1.times.10.sup.-7 to 5.times.10.sup.-3 mol based on 1 mol of silver halide. A localized phase of the complex is present on the surface of the grains. The localized phase contains the complex in an amount of 1.times.10.sup.-5 to 1.times.10.sup.-1 mol based on 1 mol of silver halide. According to the present invention, the silver halide grains are doped in the presence of a compound having a function of inhibiting a reaction of the cyano-complex with gelatin, or the compound having the function is added to the grains after the grains are doped.