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.

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 greatly improves 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 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 ion doped oxyhalogen silicate glass and a preparation method thereof. The glass is characterized by comprising the following ingredients by mol percentage: 10-70 percent of SiO2, 20-55 percent of PbF, 20-50 percent of PbCl, 0-20 percent of AlF3, 0-30 percent of Al2O3, 0-10 percent of ZnF2, 1-20 percent of Gd2O3 and 0.1-10 percent of rare earth compound. The preparation method comprises the following steps of: evenly mixing the ingredients according to the proportion thereof, pouring the mixture in a crucible, melting for 0.5-2h at 1,100-1,200 DEG C, then casting the melt on an iron casting die with the temperature of 200-300 DEG C to form glass, then putting the glass in a muffle furnace for 1-3h at 400-500 DEG C, cooling to 45-55 DEG C at a speed of 8-10 DEG C / h, and finally cooling to the room temperature. The invention has the advantages of high density, high light output, high light yield, excellent physical and chemical characteristics, simple preparation method and low production cost.

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 high-brightness pulse white-light source exciting system. A focusing lens assembly and an air chamber are sequentially arranged on a light path of laser pulses output by a nanosecond-pulse laser. The laser pulses are focused into the air chamber through the focusing lens assembly, light emitted by generated plasma flame is collected by an optical collecting device, and a high-brightness pulse white-light source is obtained. The collected white light of the high-brightness pulse white-light source exciting system can be used for spectral analysis, imaging, illumination, photoetching, transfer printing and other fields. The high-brightness pulse white-light source exciting system achieves white light output which is short in pulse time, high in instantaneous strength, stable in time and spectral property, and wide in spectral region.

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.

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 belongs to the technical field of biological examination of pathogenic bacteria in medical clinical examination, and particularly relates to a fungus fluorescent staining solution and apreparation method thereof. The fungus fluorescent staining solution is prepared from the following components in parts by weight: 0.5 to 1.5 parts of a fluorescent whitening agent, 0.07 to 0.15 partof a background pressure preparation, 10 to 15 parts of a dissolution promoter, 1 to 2.5 parts of an anti-fluorescence decay agent, 0.3 to 0.8 part of a surfactant and 0.5 to 1.5 parts of sodium chloride. The fluorescent whitening agent and the background dye are mixed and prepared; according to the staining solution, the anti-fluorescence decay agent, the surfactant, the dissolution promoter andthe sodium chloride are added, so that the staining effect and the staining durability of the staining solution are remarkably improved, the staining solution can be stably placed for a long time, specimen staining steps are simplified, and the staining solution has the advantages of high staining speed and good effects.

The invention provides a fluorescent probe with functions of detecting hydrogen peroxide and performing photodynamic killing on cancer cell activity as well as a preparation method and application thereof, and belongs to the technical field of a biochemical material. The fluorescent probe with the functions of detecting hydrogen peroxide and performing photodynamic killing on cancer cell activityhas aggregation induced luminescence characteristic, can specifically respond to the hydrogen peroxide, generates a substance with stronger fluorescence, can be applied to detection on the hydrogen peroxide in cells, and can selectively position subcellular organelle lipid droplets in the cells; the product obtained through action between the fluorescent probe and the hydrogen peroxide has large stokes displacement, so self-absorption can be avoided and background interference can be reduced; the fluorescent probe as well as the product obtained through the action between the fluorescent probeand the hydrogen peroxide have high light stability and photobleaching resistance, and are suitable for long-time tracing of the hydrogen peroxide in living cells or living bodies; meanwhile, the product obtained through the action between the fluorescent probe and the hydrogen peroxide has active oxygen generation capacity, can be applied to photodynamic killing of the cancer cells and can construct a diagnosis and treatment reagent integrating diagnosis and treatment functions.

The invention discloses an azine hydrazine compound containing phenol, an N=N bond, a diphenyl group, and a morpholine ring, and also discloses a preparation method of the azine hydrazine compound. The method includes the steps of: heating a diphenyl hydrazine derivative and arylsalicylaldehyde in a solvent at 20-150 DEG C to carry out a reaction for 1-24 h, and separating and purifying a reactionproduct to obtain the azine hydrazine compound. The invention also discloses an application of the compound for specific identification and tracking of gram-positive bacteria. The azine hydrazine compound has a significant property of aggregation-induced emission (AIE) and great solubility, has significant fluorescent staining capability on cells or bacteria, and has great application prospect.

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 an azine hydrazine compound containing diethylamine as well as a preparation method and application thereof. The method comprises the following steps: carrying out a heating reaction on a diphenyl hydrazine derivative and diethylamine-containing aryl in a solvent, and separating and purifying the reaction product to obtain the diethylamine-containing azine hydrazine compound. The invention further discloses application of the compound, the fluorescence intensity of the azine hydrazine compound is adjusted by adjusting the strength of interaction between the azine hydrazine compound and microorganisms, and fungus recognition and selective antibiosis are achieved. The azine hydrazine compound containing diethylamine has remarkable capability of generating active oxygen due to aggregation-induced emission (AIE) property, shows selective bacterial fluorescence staining capability and antibacterial activity, and has a good application prospect.

The invention relates to halide nanocrystalline dispersion glass and application thereof. The surface layer of the dispersion glass is a Cs ion exchange layer, the halide nanocrystals are distributed in the Cs ion exchange layer, the halide nanocrystals comprise one or a combination of more than two of CsPbX3, Cs4PbX6, CsX and KX, and X is one or a combination of more than two of Cl, Br and I. The invention further discloses a preparation method of the dispersion glass. According to the invention, controllable preparation of halide nanocrystals and cesium-lead halide perovskite nanocrystals is realized in a certain depth range of the surface layer of the glass by adopting cation exchange, and controllable preparation of various cesium-lead halide perovskite nanocrystals and halide nanocrystals in the surface layer of the glass can be realized by combining glass composition design and cation exchange process adjustment. The cesium-lead halide perovskite nanocrystalline dispersion glass provided by the invention can be used for preparing cesium-lead halide perovskite nanocrystalline with controllable depth range, controllable crystal types and adjustable absorption and light-emitting wave bands in the surface layer of the glass, and has application value in the fields of illumination, backlight sources, information display and the like.

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 a novel AIE (Aggregation Induced Emission) red fluorescent dye, and the molecular structural formula of the novel AIE red fluorescent dye is as shown in the description. The fluorescent dye emits red fluorescence at the solid state and the aggregative state, and the emission peak is located at 617 nm. In addition, the fluorescent dye can be used in the lipidosome imaging ofa cell, and is relatively high in selectivity.

The invention provides application of a compound with a structure as shown in a formula (I) as a fluorescent probe and a photodynamic bactericide and in preparation of a kit for detecting pathogenic microorganisms or a kit for detecting whether escherichia coli survives or not. Experimental results show that the compound with the structure as shown in the formula (I) has excellent capability of sensitizing oxygen to generate ROS; the antibacterial film can be successfully attached to or inserted into an escherichia coli film, provides the possibility of killing pathogenic microorganisms while serving as an imaging material, and has the capacity of distinguishing viable bacteria from dead bacteria; the fluorescent probe can interact with staphylococcus aureus or candida albicans to achieve a marking effect, and is used as a fluorescent probe for detecting pathogenic microorganisms; the compound has broad-spectrum antibacterial activity and efficient photodynamic antibacterial ability.

The invention relates to preparation and application of an alkaline phosphatase activated photosensitizer. The alkaline phosphatase activated photosensitizer is capable of completely inhibiting photosensitivity by ensuring no absorption in visible light spectrum in virtue of ICT effect blockage; and then, when alkaline phosphatase is specifically identified, the ICT effect resumes, so that the photosensitivity is completely released along with recovery of absorption in the visible light spectrum. The strategy facilitates accumulation of the photosensitizer in tumor cells with alkaline phosphatase overexpression; and therefor, curative effects of photodynamics therapy are improved.

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 provides a fluorescent light-emitting material which has the atomic ratio shown in a formula (I): CdxInS[1.5+x] (I). The invention also provides the preparation method of the fluorescent light-emitting material. The preparation method comprises the steps of reacting a compound containing Cd, a compound containing In and sulfur powder with an organic cladding agent in liquid olefin at the inert gas atmosphere so as to obtain the fluorescent light-emitting material with the atomic ratio shown in the formula (I). The fluorescent light-emitting material provided by the invention is excited by ultraviolet light to emit white light; because the fluorescent light-emitting material has a single component and can effectively prevent self-absorption, scattering and energy transfer, the fluorescent light-emitting material provided by the invention is high in light-emitting efficiency after being excited by ultraviolet light; an experiment result shows that after the fluorescent light-emitting material provided by the invention is excited by ultraviolet light, the color coordinate of the material is positioned in a white light region of a chromaticity diagram; and additionally, the preparation method of the fluorescent light-emitting material provided by the invention is simple, and the obtained fluorescent light-emitting material has good scattering property and stability.