摘要:
The present invention relates to a zinc sulphide phosphor and to a process for producing same. The invention further relates to a security document or document of value, to a security feature and to a method for detecting same. The phosphor according to the invention can act as electroluminescent phosphor and thus be excited by an electrical field, and this can result in emission of electroluminescent light in the blue and/or green colour region of the visible spectrum. The phosphor can moreover be excited by UV radiation in the wavelength range from 345 nm to 370 nm, and can thus emit photoluminescent light in the blue colour region of the visible spectrum. The phosphor can moreover be excited by UV radiation in the wavelength range from 310 nm to 335 nm, and can thus emit photoluminescent light in the green colour region of the visible spectrum.
摘要:
The present invention provides new compositions containing nearly monodisperse colloidal core/shell semiconductor nanocrystals with high photoluminescence quantum yields (PL QY), as well as other complex structured semiconductor nanocrystals. This invention also provides new synthetic methods for preparing these nanocrystals, and new devices comprising these compositions. In addition to core/shell semiconductor nanocrystals, this patent application also provides complex semiconductor nanostructures, quantum shells, quantum wells, doped nanocrystals, and other multiple-shelled semiconductor nanocrystals.
摘要:
The present invention provides new compositions containing nearly monodisperse colloidal core/shell semiconductor nanocrystals with high photoluminescence quantum yields (PL QY), as well as other complex structured semiconductor nanocrystals. This invention also provides new synthetic methods for preparing these nanocrystals, and new devices comprising these compositions. In addition to core/shell semiconductor nanocrystals, this patent application also provides complex semiconductor nanostructures, quantum shells, quantum wells, doped nanocrystals, and other multiple-shelled semiconductor nanocrystals.
摘要:
The present invention provides new compositions containing nearly monodisperse colloidal core/shell semiconductor nanocrystals with high photoluminescence quantum yields (PL QY), as well as other complex structured semiconductor nanocrystals. This invention also provides new synthetic methods for preparing these nanocrystals, and new devices comprising these compositions. In addition to core/shell semiconductor nanocrystals, this patent application also provides complex semiconductor nanostructures, quantum shells, quantum wells, doped nanocrystals, and other multiple-shelled semiconductor nanocrystals.
摘要:
An electroluminescent phosphor containing an effective amount of bismuth to increase the half-life of the phosphor compared to the half-life of the phosphor without the bismuth. The phosphor is produced by the method comprising the steps of preparing the electroluminescent phosphor; adding granular, elemental bismuth to the bottom of a quartz reaction vessel; covering the bismuth with a layer of quartz wool; placing the phosphor on top of the quartz wool; evacuating the reaction vessel to about 750 - 760 mm Hg and sealing the vessel; and heating the vessel to between about 500 t0 700°C for about 24 to 72 hours.
摘要:
A method for preparing a sulfide phosphor where a raw material mixture for a sulfide phosphor is placed in an almost closed first heat-resistant container and fired therein, the method being characterized in that an auxiliary material composed of carbon and/or a carbon-forming compound capable of being pyrolyzed at a temperature not higher than the firing temperature to form carbon, and a metal sulfide capable of reacting with the carbon and/or said carbon-forming compound at a temperature not lower than 600°C but not higher than the firing temperature to form a carbon sulfide is placed in the portion as physically separated from the raw material mixture for the sulfide phosphor in the said first heat-resistant container and the firing is conducted under such condition so that said first heat-resistant container may have a carbon sulfide atmosphere by the thermal reaction of the thus fired auxiliary materials.
摘要:
An electroluminescent fluorescent substance, which is composed of electroluminescent fluorescent particles having an average particle diameter of 0.5 µm to 20 µm and a variation coefficient of particle diameter of 35 % or less, and having at least 50 % have stacking faults arranged in 10 layers or more at intervals of 5 nm or less, the particles containing copper 1 x 10 -4 to I x 10 -2 mol/mol and gold I x 10 -6 to 5 x 10 -4 mol/mol, to the particles; a sheet-shaped electroluminescence device, which has the electroluminescent fluorescent substance; and an electroluminescence device system, which utilizes the sheet-shaped electroluminescence device.
摘要:
An electroluminescent fluorescent substance, which is composed of electroluminescent fluorescent particles having an average particle diameter of 0.5 µm to 20 µm and a variation coefficient of particle diameter of 35 % or less, and having at least 50 % have stacking faults arranged in 10 layers or more at intervals of 5 nm or less, the particles containing copper 1 x 10 -4 to I x 10 -2 mol/mol and gold I x 10 -6 to 5 x 10 -4 mol/mol, to the particles; a sheet-shaped electroluminescence device, which has the electroluminescent fluorescent substance; and an electroluminescence device system, which utilizes the sheet-shaped electroluminescence device.