35 results about "Photostimulated luminescence" patented technology

The present invention relates in general to nanoparticles exhibiting luminescence such as photostimulated luminescence or photoluminescence and optical switching processes based upon such properties, in more particular, the use of such photostimulated luminescence exhibiting nanoparticles and switching nanoparticle for optical storage apparatuses and sensors as well as methods of making and using same.

A light emitting device includes a die and a photostimulable luminescent substance. The die has a first semiconductor light-emitting layer emitting a first color light having a first wavelength range, and a second semiconductor light-emitting layer emitting a second color light having a second wavelength range different from the first wavelength range. The photostimulable luminescent substance is excitable by at least one of the first and second color lights to emit a third color light having a third wavelength range. The third color light is mixed with the first and second color lights to emit a light blend having a wavelength range covering the first, second, and third wavelength ranges.

The invention relates to secondary excitation type orange-red fluorescent powder and a preparation method thereof, belonging to the technical field of luminescent materials. The fluorescent powder is Sr1-a-bCa1-x-cAl2-yMexREyO4S:aEu<2+>,bDy<3+> and cTm<3+>, where Me is at least one of Zn, Cd, Mg, RE is at least one of Ga, Zn, Ge, and Si, 0<x<0.1,0<y<0.2, 0<a<0.12, 0<b<0.1, and 0<c<0.1. The design idea is that: Eu<2+> and Tm<3+> are taken as a luminescent center and Dy<3+> and the like are added to be taken as an auxiliary excitant; the light of the Eu<2+> and Tm<3+> interacts; incident light from outside excitates Eu<2+> to emit light which excitates Tm<3+> to emit light again to form a secondary excitation type light emission; the relative ratio of Eu<2+> to Tm<3+> determines the color of the emitted light; and the concentration of Dy<3+> determines the afterglow time of the secondary excitation long-afterglow fluorescent powder. The preparation method comprises the following steps: weighing each oxide raw material according to the ratio of each element in the structural formula, adding a fluxing agent into the raw materials and uniformly mixing the mixture by ball milling, placing the obtained product in a reducing atmosphere for calcinations, and crushing and screening the obtained product to obtain the required fluorescent powder. The secondary excitation type orange-red fluorescent powder can emit orange-red fluorescent light, and the afterglow time can reach 8 to 12 h.

A white-light emitting semiconductor device includes a first light-emitting die, a second light-emitting die, a photostimulable luminescent substance, and a holding assembly. The first light-emitting die emits a first radiation having a first wavelength range. The second light-emitting die emits a second radiation having a second wavelength range, and a third radiation having a third wavelength range different from the second wavelength range. The photostimulable luminescent substance is excitable to emit a fourth radiation having a fourth wavelength range. The fourth radiation is mixed with the first, second, and third radiations to result in white light. The holding assembly holds the first and second light-emitting dies, and the photostimulable luminescent substance.

A computed radiography system including a stimulating light source such as a laser, a photostimulable glass imaging plate (PGIP) substantially transparent to the stimulating light positioned such that the stimulating light impinges the PGIP perpendicularly thereto producing photostimulated luminescence light (PLL), a light collector having a light reflecting inner surface proximate the PGIP for collecting PLL emitted from the PGIP and having a hole or slot therein for admitting stimulating light into the light collector and onto the PGIP. An optical filter in communication with the light collector for blocking stimulating light waves and passing PLL therethrough. A light detector receives PLL from the optical filter and the light collector, mechanism providing relative movement between the PGIP and the stimulating light source, and mechanism including an analog to digital converter for converting the collected and detected PLL to a diagnostic readout. The system is particularly useful in mammography.

An object is to improve accuracy of photon counting in an imaging apparatus.The imaging apparatus includes a light uniformizing unit. The light uniformizing unit included in the imaging apparatus substantially uniformizes distribution of photons in an orthogonal direction toward an optical axis of incident light, which is incident to an imaging element in the imaging apparatus and the number of photons of which is to be detected, a plurality of pixels being arranged to the imaging element. The light uniformizing unit supplies the uniformized light to the imaging element to which a plurality of pixels are arranged in the imaging apparatus.

A photostimulable plate reading device. The device includes: at least one photostimulable plate carrying image data and having two opposite surfaces; an illuminator for homogeneously illuminating a first one of the two opposite surfaces of the at least one photostimulable plate with light emitted in a first wavelength range, the illumination causing the at least one photostimulable plate both to emit light in a second wavelength range by photostimulated luminescence and to scatter light in the first wavelength range; a filter for preventing the light scattered in the first wavelength range from passing and for allowing the light emitted in the second wavelength range to pass, the filter facing a second one of the two opposite surfaces of the at least one photostimulable plate; and a detector composed of a two dimensional array of pixels for detecting the light allowed to pass and for obtaining image data therefrom.

[Object] An electric conductivity-measuring material which emits light according to electric conductivity of a measurement object; an electric conductivity-measuring film containing the material; and an electric conductivity-measuring device and an electric conductivity-measuring method using the electric conductivity-measuring film are provided. An electric resistivity-measuring material which emits light according to electric resistivity of a measurement object when electrons are made incident; an electric resistivity-measuring film containing the material; and an electric resistivity-measuring device and an electric resistivity-measuring method using the electric resistivity-measuring film are also provided.[Solution] An electric conductivity-measuring material is used, which contains at least one of a fluorescent substance, a luminescent substance, an electroluminescent substance, a fractoluminescent substance, a photochromic substance, an afterglow substance, a photostimulated luminescent substance and a mechanoluminescent substance.

Employing a LED which emits light via excitation with UV light, particularly the foregoing high-power LED, disclosed are a white LED exhibiting high reliability and longer operating life, and a method of manufacturing the white LED. Also disclosed are a white light emitting diode possessing a phosphor layer which emits light via excitation with UV light, wherein the phosphor layer consists of phosphor, or possesses phosphor and transparent inorganic oxide, and a method of manufacturing the white light emitting diode, possessing the step of making phosphor particles to collide with a light emitting diode at high speed to deposit the phosphor layer, employing an aerosol deposition process.

An organic electroluminescent device comprising a plurality of electrodes stacked on a substrate, at least one of the electrodes being transparent, an organic electroluminescent layer that is layered between the plurality of electrodes and emits light by an electric field generated between the plurality of electrodes by an applied voltage, and emission sealing layers that are members that seal the plurality of electrodes and the organic electroluminescent layer and emit light by light excitation, is provided.

The invention relates to a preparation method of a terbium-doped calcium sodium phosphate glass ceramic photostimulated luminescence material. The general formula of the material is 25Na2O-23CaO-6P2O5-44B2O3-2ZrO2-xTb4O7, wherein in the formula, x=0.1-1. The method comprises the following steps: sodium carbonate, calcium carbonate, ammonium dihydrogen phosphate, boron oxide, zirconium oxide and terbium oxide are taken as raw materials, mixed sufficiently and pre-sintered, obtained molten glass is quickly poured into a stainless steel mold, calcium sodium phosphate glass is prepared, ground into powder, annealed and pressed into round sheets, the round sheets are placed into a muffle furnace for heat treatment, NaCaPO4 crystals are separated out from the glass, and the terbium-doped calciumsodium phosphate glass ceramic photostimulated luminescence material is obtained. The material has good optical properties, high sensitivity and wide dose response range (0.01-1000 Gy), can be applied to personal dosimeters, environmental dosimeters, medical dosimeters and the like and is an ideal photostimulated luminescence material for detecting radiation dose.

The invention discloses a preparation method of Tb<3+>-activated micron-sized barium lutecium acid green fluorescent powder for potential fingerprint development and the fluorescent powder prepared by the preparation method. The general chemical formula of the micron-sized fluorescent powder is Ba3Lu4(1-x)Tb4xO9, and the adopted preparation method is a high-temperature solid-phase method and comprises the steps: uniformly mixing raw materials according to a stoichiometric ratio, carrying out heat preservation sintering for 6 hours at the temperature of 1500 DEG C in a normal-pressure carbon thermal reduction atmosphere, and finally crushing, grinding and screening the sintered product to obtain the fluorescent powder material. The preparation process is simple, and toxic and harmful substances are not generated in the preparation process; the particle size of the fluorescent powder is micron-sized, the fluorescent powder can be excited by ultraviolet light, the emitted light is green, and the fluorescent powder has good thermal stability. The fluorescent powder has good application potential in the aspect of potential fingerprint development.

An exemplary embodiment of the present invention provides a computed radiography system, comprising a stimulating light source, a imaging plate (IP) positioned such that the stimulating light impinges the IP perpendicularly thereto producing photostimulated luminescence light (PLL) having a wave length different from said stimulating light source, a light collector having a bundle of optical fibers for collecting and transferring PLL emitted from the IP, the bundle providing with a liner end proximate to the IP and a two-dimensional end far away from the IP in which a plurality of optical fibers are arranged according to a constant rule, an optical filter in communication with said light collector for blocking stimulating light waves and passing PLL therethrough, a light detector for receiving PLL from the two-dimensional end of the bundle of the light collector.

A radiographic image reading device includes a reading unit configured to photoelectrically read photostimulated luminescence light produced from a storage phosphor sheet illuminated with excitation light, the storage phosphor sheet, at which a radiographic image is stored, being scanned by a scanning unit using the excitation light; and a control unit configured to control the reading unit so as to cause the reading unit, in a case of reading at a first resolution, to read with excitation light at a first scanning speed and a first intensity and, in a case of reading at a second resolution that is a higher resolution than the first resolution, to read with excitation light at a second scanning speed that is slower than the first scanning speed and a second intensity that is smaller than the first intensity.