38 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.

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.

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.

The present invention provides an oxide glass capable of exhibiting a long lasting afterglow and photostimulated phosphorescence, whereby energy can be accumulated by radiation excitation, for example, by gamma -rays, X-rays, UV-rays, etc., light emission can be continued for a long time even after stopping the excitation. Furthermore, the long lasting afterglow and photostimulated luminescence oxide glass can be used not only as a phosphorescent material for night illumination or night signal, but also as a material for confirming an infrared laser or controlling an optical axis because of exhibiting photostimulated luminescence by irradiation of infrared rays or visible rays. In addition, this glass is useful for recording or reproducing of gamma -rays, X-rays or UV-rays images. This glass material is represented, in term of atoms for making up the glass, by the following chemical composition (mol %): - SiO2 1 to 55% - B2O3 1 to 50% (SiO2 + B2O3 = 20 to 60%) - ZnO 30 to 75% - Tb2O3 0 to 7% - MnO 0 to 2% (Tb2O3 + MnO = 0.01 to 7%) - R2O 0 to 25% (R: at least one atom selected from Li, Na, K and - Cs) - R'O 0 to 25% (R': at least one atom selected from Mg, Ca, Sr - and Ba) - Al2O3 0 to 15% - Ga2O3 0 to 15% - GeO2 0 to 20% - ZrO2 0 to 5% - Ln2O3 0 to 8% (Ln: at least one atom selected from Y, La, Gd, - Yb, Lu, Sm, Dy, Tm and Pr) and - Sb2O3 0 to 0.5%. -

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.

The object of the present invention is to provide an oxide glass capable of exhibiting a long lasting afterglow and photostimulated phosphorescence, whereby energy can be accumulated by radiation excitation, for example, by gamma-rays, X-rays, UV-rays, etc. and light emission can be continued for a long time even after stopping the excitation. That is, the present invention relates to an oxide glass capable of exhibiting a long lasting afterglow and photostimulated luminescence, characterized by a constitutional composition comprising, at least, terbium oxide (Tb2O3) or manganese oxide (MnO), gallium oxide (Ga2O3) or aluminum oxide (Al2O3), alkali metal oxide or alkaline earth metal oxide and boron oxide (B2O3) or silicon oxide (SiO2) or zinc oxide (ZnO).

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.

This invention relates to a white light emitting device which utilizes a blue or blue-green LED to excite two types of phosphors with the emitted wavelength sphere of 450 to 500nm to let them emit a yellow fluorescent light with the main wavelength sphere of 520 to 580nm and a red fluorescent light of 580 to 640nm. After matching the mixed proportion of the phosphor and the package material and packaging it, a white light emitting device with good emitting property is got. The blue light needed for matching in the phosphor used in a white light emitting device can be regulated to rather long wavelength and the light output is higher than the blue light with short wavelength, when excited by blue or blue-green light.

Described is a method comprising the following steps: (a) moving a selected optically stimulated luminescence (OSL) sensor of two or OSL sensors mounted on a dosimeter sled to a reading position for an OSL reader; (b) reading the selected OSL sensor at the reading position using the OSL reader to measure a radiation dosage to which a dosimeter in which the dosimeter sled has been mounted has been exposed; and (c) repeating steps (a) and (b) for each of the two or more OSL sensors, wherein each OSL sensor comprises an optically stimulated luminescent material (OSLM) mounted in one or more cylindrical cup-shaped energy compensating filters, and wherein the dosimeter sled is part of a dosimeter.

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 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 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 composite comprises a polymer matrix and a luminophore dispersed therein. The composite is useful as a sensing film that is used as an optical sensor for oxygen measurement comprising the composite sensing film; a source of photons for photo-exciting the luminophores and a waveguide, transparent in the frequency range of the excitation photons, for guiding the excitation photons from the source to the composite sensing film; a detector for measuring properties of photons emitted from the luminophores. A system including a computer may be useful for coordinating the activities of the sensor.

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.

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.

The invention provides a rare earth-doped metal halide photostimulated luminescence glass and a method for preparing the same characterized in that the mol percentage composition of the glass is as follows: AlF3 25-40%, BaF2 25-63%, BaCl2 1-15%, BaBr2 1-15%, YF3 10-20%, EuF3 0.1-1%, wherein X is one or two selected from one valence halide ions Cl<-> and Br<->. The rare earth-doped metal halide photostimulated luminescence glass is obtained by melting for 10-45 minutes in a high-frequency furnace under the chlorine or inert atmosphere protection at 800-1000 DEG C and cooling. The method of the invention not only simplifies the preparation steps of the radiation image storage materials of photostimulated liminescence glass, eliminates the external interference factors during the preparation process to work high efficiently, increases the luminous intensity of the rare earth ion in the glass, but also has advantage of rapid heating and cooling.

An image reading apparatus includes an optical unit for reading the image information by scanning and irradiating the photostimulable phosphor plate with the excitation light from a light source and converging photo-stimulated luminescence light emitted from the photostimulable phosphor plate to conduct photoelectric conversion, a base table, a linear motor for moving the optical unit with respect to the base table, a wire fixed on the base table at both ends of the wire, a pulley rotatably fixed on the optical unit for being rotated by relative movement between the pulley and the wire caused by the movement of the optical unit, a rotary encoder for detecting a rotational speed of the pulley; and a control section for controlling the linear motor based on a detection result of the rotary encoder, wherein the wire is wound not less than one turn around the pulley and inclined at a predetermined angle against a line crossing a rotational axis of the pulley at right angle.

The invention relates to a dust granule counter which comprises an operation table top, a mixer, a PSL (photostimulated luminescence) sprayer, a sprayer flow meter, an air flow meter, a prefilter, a high-efficiency filter, a flow dispensing grid plate, a fluorescent lamp, an air pressure regulating valve, a spray pressure regulating valve, a sampling buffer and a compressed air inlet, wherein the mixer, the sprayer flow meter and the air flow meter are arranged on the operation table top; the high-efficiency filter is positioned on the flow dispensing grid plate; the sampling buffer is also arranged on the operation table top; the prefilter is arranged on the mixer; and the flow dispensing grid plate is arranged on the fluorescent lamp.

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.

An image scanner which has an improved constant speed characteristic and provides an excellent diagnostic image having no image nonuniformity. The image scanner is provided with an optical unit (1), which irradiates a photostimulable phosphor plate (P) with exciting light (L1) from a light source while performing scanning, collects photostimulated luminescence light emitted from the photolstimulable phosphor plate (P), performs photoelectric conversion and reads image information; a linear motor (7) for moving the optical unit (1); a wire (6) which moves with the optical unit (1); a pulley (52) which rotates by transmission of movement of the optical unit (1) through the wire (6); a rotary encoder (51) for detecting the rotating speed of the pulley (52); and a control means (100) for controlling the linear motor (7) based on the detection results of the rotary encoder (51). The wire (6) is wound around the shaft of the pulley (52) one turn or more by being inclined to be at a prescribed angle from a line (A) orthogonally intersecting with a rotating axis of the pulley (52).

The invention provides a rare earth-doped metal halide photostimulated luminescence phase separation glass and a method for preparing the same characterized in that the mol percentage composition of the glass is as follows: AlF3 25-40%, BaF2 5-63%, BaCl2 1-15%, BaBr2 1-15%, YF3 10-20%, EuF3 0.1-1%. The rare earth-doped metal halide photostimulated luminescence phase separation glass is obtained by melting for 10-45 minutes in a high-frequency current furnace under the chlorine or inert atmosphere protection at 800-1000 DEG C and heat-treating for 0.5-4 hours around the phase separation temperature after cooling. The method of the invention solves the problem that the powder morphology is not easy to control during the agglomeration and milling processes of photostimulated luminescence powder synthesis using solid phase method and liquid phase method, simplifies the preparation steps of the radiation image storage materials of photostimulated liminescence glass, while eliminates the external interference factors during the preparation process, increases the luminous intensity of the rare earth ion in the glass, has advantage of rapid heating and cooling and reduces the volatilization of the halogen component.