37results about How to "Avoid self-absorption" patented technology

A light emitting device includes a board, a semiconductor light emitting element formed on the board optionally via a submount, a cap sealing the semiconductor light emitting element and a reflector provided surrounding the cap. The cap has top and bottom surfaces that are parallel to the top surface of the semiconductor light emitting element, and the spacing between the top and bottom surfaces is 1-3 times the longest diagonal or the diameter of the semiconductor light emitting element. Also disclosed is a process for producing the device.

A light emitting device includes a board, a semiconductor light emitting element formed on the board optionally via a submount, a cap sealing the semiconductor light emitting element and a reflector provided surrounding the cap. The cap has top and bottom surfaces that are parallel to the top surface of the semiconductor light emitting element, and the spacing between the top and bottom surfaces is 1-3 times the longest diagonal or the diameter of the semiconductor light emitting element. Also disclosed is a process for producing the device.

A display device capable of realizing a desired color temperature is provided. Phosphor layers 5a, 5b and 5c, which are excited by ultraviolet radiation produced by discharge and emit red, green and blue visible light, are formed inside a red, green and blue gas discharge tube 1a, 1b, and 1c, respectively. The height Yc of the phosphor layer 5c with respect to a rear support body 20 is higher than the heights Ya and Yb of the phosphor layers 5a and 5b with respect to the rear support member 20, and establishes the relationship Yc>Ya=Yb. Therefore, the distance from the phosphor layer 5c to the opposite discharge surface on a front support body is shorter than those from the phosphor layers 5a and 5b, the visible light emitted from the display device 10 is shifted toward blue, that is, the color temperature increases.

The invention relates to a fluoride red fluorescent powder and a luminescent device based on the fluorescent powder. According to the fluoride red fluorescent powder, tetravalent manganese ions Mn < 4+ > are doped into K2MF6 matrix particles to serve as light-emitting ions; wherein from the radial direction from the centers of the K2MF6 matrix particles to the surfaces of the K2MF6 matrix particles, the doping concentration of Mn < 4 + > is controlled to continuously increase from zero to the maximum value, and then reduce from the maximum value to zero; the K2MF6 matrix particles are matrixparticles with continuous lattice structures; no layered crystallization interface exists in the radial direction from the centers of the K2MF6 matrix particles to the surfaces of the K2MF6 matrix particles. In the luminescent device, the K2MF6: Mn < 4 + > red fluorescent powder is arranged on a light emitting path of an LED chip, and the K2MF6: Mn < 4 + > red fluorescent powder is arranged between an upper layer transparent optical medium and a lower layer transparent optical medium.

The invention discloses terbium-ion-doped gadolinium lutetium oxyfluoride scintillation glass and a preparation method thereof. The terbium-ion-doped gadolinium lutetium oxyfluoride scintillation glass is prepared by mixing raw material components, melting, casting a mould and annealing; and the terbium-ion-doped gadolinium lutetium oxyfluoride scintillation glass disclosed by the invention is prepared from the following raw material components in percentage by mole: 25-30mol% of SiO2, 10-15mol% of B2O3, 15mol% of BaF2, 25-30mol% of Lu2O3, 10mol% of Gd2O3 and 5mol% of Tb2O3. The terbium-ion-doped gadolinium lutetium oxyfluoride scintillation glass disclosed by the invention has the advantages of higher density and higher luminous intensity as Lu2O3 and Gd2O3 components coexist, self absorption of optical scintillation glass can be avoided, the density of Lu2O3 is higher than that of Gd2O3, the heavy metal content is more than or equal to 35mol%, the density is more than 6.0g / cm<3> or above and the luminous integral intensity is higher and is more than 2700. A preparation method is simple, the production cost is lower, and industrial production is easy to realize.

The invention discloses cerium-ion-doped gadolinium lutetium oxyfluoride scintillation glass and a preparation method thereof. The cerium-ion-doped gadolinium lutetium oxyfluoride scintillation glass is prepared by mixing raw material components, melting, casting a mould and annealing; and the cerium-ion-doped gadolinium lutetium oxyfluoride scintillation glass disclosed by the invention is prepared from the following raw material components in percentage by mole: 23-34mol% of SiO2, 15mol% of B2O3, 15mol% of BaF2, 20-30mol% of Lu2O3, 15mol% of Gd2O3 and 1-2mol% of Ce2O3. The cerium-ion-doped gadolinium lutetium oxyfluoride scintillation glass disclosed by the invention has the advantages of higher density and higher luminous intensity as Lu2O3 and Gd2O3 components coexist, self absorption of optical scintillation glass can be avoided, the density of Lu2O3 is higher than that of Gd2O3, the heavy metal content is more than or equal to 35mol%, the density is more than 6.0g / cm<3> or above and the luminous integral intensity is higher and is more than 7900. A preparation method is simple, the production cost is lower, and industrial production is easy to realize.

An object of the present invention is to provide a light emitting device with excellent light extraction efficiency due to reduced self-absorption of light from the light emitting element. The inventive light emitting device comprises a board, a semiconductor light emitting element formed on the board optionally via a submount, a cap sealing the semiconductor light emitting element and a reflector provided surrounding the cap, wherein the cap has top and bottom surfaces that are parallel to the top surface of the semiconductor light emitting element, and the spacing between the top and bottom surfaces is 1-3 times the longest diagonal or the diameter of the semiconductor light emitting element.

The invention provides a fluorescent probe capable of detecting hydrogen peroxide and photodynamically killing cancer cells, its preparation method and application, and belongs to the technical field of biochemical materials. The fluorescent probe provided by the present invention, which has the activity of hydrogen peroxide detection and photodynamic killing of cancer cells, has aggregation-induced luminescence characteristics, can specifically respond to hydrogen peroxide, and produces a substance with stronger fluorescence, which can be applied to the detection of intracellular hydrogen peroxide, and can selectively Locate the subcellular organelle lipid droplets in cells; the product of the fluorescent probe interacting with hydrogen peroxide has a large Stokes shift, which can avoid self-absorption and reduce background interference; the fluorescent probe and its product interacting with hydrogen peroxide have Strong photostability and anti-photobleaching ability, suitable for long-term tracer of hydrogen peroxide in living cells or in vivo; at the same time, the product of the interaction between the fluorescent probe and hydrogen peroxide also has the ability to generate active oxygen, which can be used for photodynamic killing of cancer cells , to construct a diagnostic and therapeutic reagent with both diagnostic and therapeutic functions.

The invention discloses rare-earth doped oxyfluoride tellurate scintillation glass and a preparation method thereof. Raw materials TeO2, PbF2, BaF2 and Gd2O3 of the scintillation glass are high-density compounds, so the obtained oxyfluoride tellurate glass has high density, and the density can reach over 6g / cm<3>. Compared with the traditional scintillation glass containing the raw materials PbO,Bi2O3 and the like according to the raw material formula, the scintillation glass of the invention has high short wavelength blue-violet light transmittance and avoids self absorption of the glass; wide wave band also can transmit visible light; the Gd2O3 raw material contained in the scintillation glass can sensitize the luminescence of rare-earth ions such as Tb3+, Ce3+ and the like and greatlyimproves the output of scintillation light; therefore, the scintillation glass has the advantages of high density, strong scintillation light emission and output, wide wave band and good short wavelength transmission performance. The preparation method for the scintillation glass is simple and has low production cost.

The invention provides a photovoltaic power generation system and a manufacture method. The photovoltaic power generation system comprises an array fluorescent optical waveguide and solar cells; the solar cells are arranged in the side surface of the array fluorescent optical waveguide; and the array fluorescent optical waveguide comprises a first substrate, a fluorescent layer and a second substrate which are arranged successively from top to bottom. The system and method are convenient in manufacture technology and easy to realize.

The invention discloses rare earth doped oxyfluoride tellurite scintillation glass and a preparation method thereof. The scintillation glass and the preparation method have the following advantages: the raw materials of the scintillation glass, such as TeO2, PbF2, BaF2 and Gd2O3, are all high-density compounds, so the obtained oxyfluoride tellurite glass has density higher than 6g / cm<3>; compared with the traditional scintillation glass containing such raw materials as PbO and Bi2O3, the scintillation glass containing the above raw materials has higher short wavelength blue and violet light transmittance, so self-absorption of the scintillation glass is avoided and visible light can transmit the glass even the wave band is wider; and the scintillation glass contains Gd2O3, and luminescence of sensitized Tb3<+>, Ce3<+> and other rare earth ions greatly improves flare light output. Therefore, the scintillation glass has the advantages of high density, strong flare light luminescence output, wider wave band and good short wavelength transmittance; and the preparation method of the scintillation glass is simple and is lower in production cost.

The invention discloses a device and a method for restraining a self-absorption effect of a laser induced breakdown spectrometry by utilizing microwave-assisted stimulation. The device comprises a pulse laser, a convergent lens, a spectrograph, a photoelectric detector, a computer, a three-dimensional displacement platform, a microwave probe and a microwave generator. The invention utilizes the excellent penetrability of the microwave-assisted stimulation to simultaneously stimulate the base particles of almost all the elements in plasma, avoid the self-absorption for central similar emission spectra, restrain and eliminate the self-absorption effect of the plasma from the source, so as to promote the accuracy and precision of laser induced breakdown spectrometry quantitative analysis. According to the invention, microwave is adopted for assisting the laser induced breakdown spectrometry, the microwave energy is radiated to laser plasma through a probe near field, no sealing chamber is required, a sample loading process is simple and the advantages of quick, in situ, real-time, multi-element and remote analysis of the laser induced breakdown spectrometry under atmospheric environment are remained.

The invention discloses rare earth doped oxyfluoride tellurite scintillation glass and a preparation method thereof. The scintillation glass and the preparation method have the following advantages: the raw materials of the scintillation glass, such as TeO2, PbF2, BaF2 and Gd2O3, are all high-density compounds, so the obtained oxyfluoride tellurite glass has density higher than 6g / cm<3>; compared with the traditional scintillation glass containing such raw materials as PbO and Bi2O3, the scintillation glass containing the above raw materials has higher short wavelength blue and violet light transmittance, so self-absorption of the scintillation glass is avoided and visible light can transmit the glass even the wave band is wider; and the scintillation glass contains Gd2O3, and luminescence of sensitized Tb3<+>, Ce3<+> and other rare earth ions greatly improves flare light output. Therefore, the scintillation glass has the advantages of high density, strong flare light luminescence output, wider wave band and good short wavelength transmittance; and the preparation method of the scintillation glass is simple and is lower in production cost.

The invention discloses europium-ion-doped gadolinium lutetium oxyfluoride scintillation glass and a preparation method thereof. The europium-ion-doped gadolinium lutetium oxyfluoride scintillation glass is prepared by mixing raw material components, melting, casting a mould and annealing; and the europium-ion-doped gadolinium lutetium oxyfluoride scintillation glass disclosed by the invention is prepared from the following raw material components in percentage by mole: 20-35mol% of SiO2, 13-20mol% of B2O3, 15mol% of BaF2, 25-35mol% of Lu2O3, 10mol% of Gd2O3 and 2-5mol% of Eu2O3. The europium-ion-doped gadolinium lutetium oxyfluoride scintillation glass disclosed by the invention has the advantages of higher density and higher luminous intensity as Lu2O3 and Gd2O3 components coexist, self absorption of optical scintillation glass can be avoided, the density of Lu2O3 is higher than that of Gd2O3, the heavy metal content is more than or equal to 35mol%, the density is more than 6.0g / cm<3> or above and the luminous integral intensity is higher. A preparation method is simple, the production cost is lower, and industrial production is easy to realize.