Abstract: A method for producing a contrast agent includes the reaction step of allowing a cyanine dye containing a naphthyl group and a carboxyl or carboxylate group to react with a polyethylene glycol containing an amino group in an organic solvent to form a conjugate, and the purification step of purifying the conjugate using an organic solvent.

Abstract: To provide a particle promoting hydrophobic metal phthalocyanine aggregation, having absorption in a wavelength region suitable for a photoacoustic imaging method and having a high molar absorbance coefficient per particle by increasing the weight percentage of the dye in the particle. The particle of the present invention is a particle having a hydrophobic metal phthalocyanine and a surfactant, wherein the weight percentage of the hydrophobic metal phthalocyanine is 6% or more.

Abstract: Provided is a particle having a large photoacoustic signal per unit dye, the particle including: one of a hydrophobic metal naphthalocyanine dye and a hydrophobic metal phthalocyanine dye; one of an oil, a fatty acid, and a fatty acid ester as a matrix material; and a surfactant, in which a ratio of the weight of the matrix material to the weight of the particle is 50% or more.

Abstract: A conventional silicon naphthalocyanine-containing liposome is required to incorporate a dye dispersed therein for use in photodynamic therapy, and is thus low in dye content and also low in photoacoustic signal. According to a lipid particle containing a silicon naphthalocyanine analog, in which the ratio A/B of an absorption coefficient A at a first absorption local maximum to an absorption coefficient B at a second absorption local maximum in a range from 700 nm to 800 nm is 5.0 or less, the dye content in the lipid particle can be increased and the photoacoustic signal intensity can be improved.

Abstract: Provided is the following indocyanine green (ICG)-containing particle to be used as, for example, a contrast agent for fluorescent imaging or photoacoustic imaging. The leakage of ICG from the particle in a serum is prevented and hence the particle can stably retain ICG. According to a particle characterized by having an aggregate of indocyanine green and a phospholipid, the leakage of ICG from the particle in a serum or the like is prevented and hence ICG can be stably retained in the particle.

Abstract: An object of the present invention is to increase the dye content in nanoparticles and to improve the signal intensity per particle.

Abstract: There is provided an ICG-loaded polymer nanoparticle that is dynamically stable, prevents the leakage of contained ICG and the resulting discoloration, and has a high molar absorbance coefficient. The particle contains a hydrophilic dye having a sulfonate group and a hydrophobic polymer, and the particle further contains at least one of a lipid having a positively charged region, a nicotinic acid derivative and a thiamine derivative.

Abstract: An image display apparatus includes a rear plate provided with a plurality of electron-emitting devices, each electron-emitting device emitting electron; a face plate disposed opposite the plurality of electron-emitting devices and provided with a plurality of pixels of phosphor, each pixel of phosphor being irradiated with electrons emitted from corresponding ones of the electron-emitting devices to generate light; and a driver for scanning the plurality of electron-emitting devices for emitting electron from the plurality of electron-emitting devices. The phosphor has luminescence center of allowed transition type material, and the driver scans the plurality of electron-emitting devices so that maximum of charge density dosed in one pixel phosphor, during one scanning period, is equal to or larger than 3×10?8 C/cm2.

Abstract: The present invention, which aims to obtain, in a Ga2S4:Eu phosphor, high luminance even when a particle size is set to 1000 nm or less, is characterized by a step of forming a raw material particle including a constituent component of a host material except a sulfur component and a constituent component of an activator in a composition ratio in the phosphor; a step of forming an amorphous precursor particle by heating and cooling the raw material particle by thermal plasma; and a step of baking the precursor particle in a sulfurization atmosphere to set the particle size to 1000 nm or less and a crystallite size to 60% or more of the particle size.

Abstract: A phosphor having the lowest E/L ratio of the luminance (L) to the luminous efficiency (E) of each phosphor for obtaining a target chromaticity of white using a plurality of phosphors which emit different colors on a light-emitting substrate is selected, and the light reflectance of the portion of the metal back layer formed on this phosphor is set to be higher than the portion formed on the other phosphors.

Abstract: An image display apparatus includes: a rear plate provided with a plurality of electron-emitting devices; a face plate having a plurality of pixels in each of which there is arranged a phosphor that emits light by being irradiated with electrons emitted by the electron-emitting devices; and a drive circuit that receives an image signal and drives the electron-emitting devices. The phosphor is a phosphor represented by general formula (I): MBO3:Eu (wherein M denotes at least one of Y and Gd). The drive circuit drives the electron-emitting devices in such a manner that an upper limit of charge density injected to the pixels is equal to or greater than 5×10?8 (C/cm2) per one scan.

Abstract: There is provided an electron-emitting device of a field emission type, with which the spot size of an electron beam is small, an electron emission area is large, highly efficient electron emission is possible with a low voltage, and the manufacturing process is easy. The electron-emitting device includes a layer 2 which is electrically connected to a cathode electrode 5, and a plurality of particles 3 which contains a material having a resistivity lower than that of a material constituting the layer 2, and is wherein a density of particles 3 in the layer 2 is 1×1014/cm3 or more and 5×1018/cm3 or less.

Abstract: There is provided an electron-emitting device of a field emission type, with which the spot size of an electron beam is small, an electron emission area is large, highly efficient electron emission is possible with a low voltage, and the manufacturing process is easy. The electron-emitting device includes a layer 2 which is electrically connected to a cathode electrode 5, and a plurality of particles 3 which contains a material having a resistivity lower than that of a material constituting the layer 2, and is wherein a density of particles 3 in the layer 2 is 1×1014/cm3 or more and 5×1018/cm3 or less.

Abstract: The method for manufacturing a fluorescent paste includes a process of applying a fluorescent paste including a sulfide fluorescent material and a binder resin onto a substrate, a first baking process of baking the substrate for a predetermined time at a first temperature that is equal to or lower than a temperature at which a generated amount of water has a maximum in a case where the fluorescent paste is measured by a TDP-MS method, and a second baking process of baking the substrate for a predetermined time at a second temperature that is equal to or higher than a temperature at which a generated amount of carbon dioxide has a minimum in a case where the fluorescent paste is measured by a TDP-MS method after the first baking process.

Abstract: A phosphor of the present invention includes BaxSr1-xGa2S4:Eu, where 0<X<0.5. Preferably, 0.03?X?0.4. A light-emitting member of the present invention includes a base member; and a phosphor arranged on the base member. An image display apparatus of the present invention includes the light-emitting member and an excitation source for light emitting the light-emitting member.

Abstract: A flat panel image display device includes a rear plate including plural electron emission elements, a face plate disposed opposed to the rear plate, fluorescent members being disposed on a surface of the face plate opposed to the rear plate, and the fluorescent members being covered with a metal back film, and a voltage applying unit to apply an acceleration voltage of 8 kV to 15 kV between the rear plate and the face plate. In addition, the metal back film has a getter material, and a current luminance characteristic of the fluorescent member satisfies ??0.9 if L=kl? , wherein L is luminance, l is an irradiation current, and k is a constant.

Abstract: There is provided an electron-emitting device of a field emission type, with which the spot size of an electron beam is small, an electron emission area is large, highly efficient electron emission is possible with a low voltage, and the manufacturing process is easy. The electron-emitting device includes a layer 2 which is electrically connected to a cathode electrode 5, and a plurality of particles 3 which contains a material having a resistivity lower than that of a material constituting the layer 2, and is wherein a density of particles 3 in the layer 2 is 1×1014/cm3 or more and 5×1018/cm3 or less.

Abstract: An object of the present invention is to enhance a converging property of an electron beam in an electron-emitting device in which a cathode electrode, an insulating layer, and a gate electrode are laminated and a through hole is formed by partially removing the gate electrode so as to obtain an exposed portion of the cathode electrode. In such an electron-emitting device in which the cathode electrode, the insulating layer, and the gate electrode are laminated and the through hole is formed by partially removing the gate electrode so as to obtain the exposed portion of the cathode electrode, only a central region of the electron-emitting layer on the cathode electrode is connected to the cathode electrode. With this structure, it becomes possible to generate an electron beam only from the central region of the electron-emitting layer connected to the cathode electrode and to realize an electron-emitting device having a small beam diameter and a high-definition image-forming apparatus.

Abstract: An image display apparatus includes a rear plate provided with a plurality of electron-emitting devices, each electron-emitting devices emitting electron; a face plate disposed opposite the plurality of electron-emitting devices and provided with a plurality of pixels of phosphor, each pixel of phosphor being irradiated with electrons emitted from corresponding one of the electron-emitting devices to generate a light; a driver for scanning the plurality of electron-emitting devices for emitting electron from the plurality of electron-emitting devices, wherein the phosphor has luminescence center of allowed transition type material, and said driver scans the plurality of electron-emitting device so that maximum of charge density dosed in one pixel phosphor, during one scanning period, is equal to or lager than 3×10?8 C/cm2.

Abstract: A display displays a color image by using a light source of at least four or more primary colors, and at least one color of the light source is yellow. Thus, it is possible to provide a flat panel display that can acquire a wider color reproduction range without sacrificing luminance.