34 results about "Near ultraviolet" patented technology

LED devices and methods of operating them are described. An LED lighting device includes a substrate (702), a white LED (402) on the substrate at a location configured for alignment with an optical axis of an automotive lamp when installed, and a near ultraviolet LED (404) on the substrate at a location spaced apart from the white LED by an amount such that the near ultraviolet LED is defocused from the optical axis of the automotive lamp when installed such that the near ultraviolet LED emits energy in the near ultraviolet band in a larger area than the white LED when powered on.

The invention relates to the technical field of luminescent materials, in particular to a red fluorescent material, a preparation method and application thereof, a lower transfer layer and preparation of the lower transfer layer, the red fluorescent material has a chemical formula of K < 0.5 > La < 0.5 > Sr Mg < 1-x > (W < 1-y > Tey) < 1-z > O6: zMn < 4 + >, xLu < 3 + >, wherein 0 lt; x is less than or equal to 0.1, 0lt; y is less than or equal to 0.5, 0lt; and z < = 0.05. The material can be excited by visible light and near ultraviolet in sunlight and can emit red light at the same time, namely sunlight in the wavelength range of 300-600 nm is converted into dark red light in the wavelength range of 600-800 nm, the problem that a silicon-based solar cell is poor in short-wavelength photoelectric conversion efficiency is solved, and the photoelectric conversion efficiency of the silicon-based solar cell is improved.

The purpose of the present invention is to provide an optical glass which is suitable for molding by reheating treatment and has excellent internal transmittance in a near ultraviolet region, i.e., a wavelength of 320-400 nm. The technical problem is solved by an optical glass which contains, in terms of cation% (mol%), 40.0-70.0% of Si < 4 + >, more than 0% and 20.0% or less of B < 3 + >, more than 0% and 20.0% or less of Pb < 2 + >, and 5.0-20.0% of K < + >, the total content of R < n + > being 15.0-35.0% (R < n + >: one or more elements selected from the group consisting of Li < + >, Na < + >, and K < + >), and in terms of anion% (mol%), the total content of R < n + > is 5.0-35.0% (R < n + >: one or more elements selected from the group consisting of Li < + >, Na < + >, and K < + >). F-is contained in an amount of more than 0% but not more than 20.0%.

The invention relates to an ultraviolet-blue light filtering type conjugated organic chromophore as well as a preparation method and application thereof, the ultraviolet-blue light filtering type conjugated organic chromophore provided by the invention is prepared by taking benzothiadiazole as a core, fusing heterocyclic ring units on two sides and introducing an aldehyde group (CHO) substituent, can be dissolved in organic solvents such as chloroform and chlorobenzene, and has excellent film-forming property. The material has strong absorption in the wave band of 350-550 nm, the maximum absorption peak is at the position of 460 nm, and the blue light hazard wave band can be accurately covered. When the material is applied to a semitransparent organic solar cell, the color rendering index (CRI) reaches 92 or above, and the material is responsive to 300-400 nm near ultraviolet light. The material can be widely applied to photoelectron protection materials, display device coatings and eye protection products, and the problems that an existing material excessively absorbs red light and is low in CRI are solved.

The invention belongs to the technical field of luminescent materials and solid-state lighting, and particularly discloses Ba2AlLaO5: Eu < 3 + > red-light fluorescent powder and a preparation method thereof. The fluorescent powder can be effectively excited in a near ultraviolet / purple light wave band to generate red light for emission, and belongs to transition from 5D0 to 7FJ (J = 0-4) of Eu < 3 + >; gd < 3 + > does not directly emit light, but can sensitize Eu < 3 + > through non-radiative energy transfer, so that the emission intensity of red light (702 nm) is enhanced. The fluorescent powder has the advantages of being stable in structure, capable of being matched with a near ultraviolet / purple light LED chip, strong in dark red emission and the like, and is suitable for the fields of solid-state illumination, display and the like.

The application discloses a kind of by multi-phase Eu 2+ And charge compensation agent doped blue cyan fluorescent powder and its preparation method, belong to fluorescent powder technical field, by multi-phase Eu 2+ And charge compensation agent doped blue cyan fluorescent powder molar ratio general formula is: KAlSi3O8:3mol%Eu 2+ :Xmol%M + , and 1.0≤x≤11.0, wherein M + It is selected from Li + , Na + , Rb + , Cs + Four charge compensation ions, and the ionic radius of M + With K + There is controllable difference.Benefiting from the unique structural design, the prepared fluorescent powder can emit adjustable strong blue cyan light under near ultraviolet-blue light excitation, and the luminescence thermal quenching performance, quantum efficiency and spectral stability are all significantly improved.The fluorescent powder is applied to white light LED device packaging, and the efficient and wide-spectrum blue cyan emission and cyan spectral component can be used.Only by matching with a blue light chip and a single yellow / red fluorescent powder, high-quality full-spectrum white light with high color rendering index can be realized under the conditions of simplifying packaging process and reducing cost, and the fluorescent powder shows important application prospects in the fields of healthy lighting, high-end display and precise spectral design.

The invention discloses an ultraviolet laser generating device which comprises an intermediate infrared laser generating system, a near ultraviolet laser generating system and a sum frequency crystal. The mid-infrared laser generating system comprises a first pumping source, a first focusing coupling system and a first laser resonant cavity; the near ultraviolet laser generation system comprises a second pumping source, a second focusing coupling system and a second laser resonant cavity; the mid-infrared and near-ultraviolet dual-wavelength laser is adopted to perform sum frequency in the sum frequency crystal, so that the deep ultraviolet laser can be efficiently obtained.

Illustrative embodiments of the invention generally relate to photovoltaics and solar energy harvesting devices and, particularly, to those that are transparent or semi-transparent, allowing sufficient visible light through them to allow visualization of objects through them, and more particularly, to those that supplement their primary near ultraviolet light absorption with secondary and / or tertiary absorptions of narrow bands of visible light while maintaining their transparency. Various embodiments of the invention relate to single solar materials with both primary ultraviolet absorption and secondary, narrow-band visible absorption, while some embodiments of the invention utilize mixtures of one or more materials to realize a primary ultraviolet absorption of light with secondary, or even tertiary, narrow bands of visible light absorption. Means of manufacturing such photovoltaics and solar energy harvesting devices will also be disclosed as well as the applications and uses thereof.

The invention discloses yttrium-magnesium-gallium-aluminum-germanium garnet-based red-light fluorescent powder and a preparation method thereof. The chemical composition expression formula of the yttrium magnesium gallium aluminum germanium garnet-based red light fluorescent powder is Y (3-x) MgGa2AlGeO12: xEu < 3 + >, and x is more than or equal to 0.01 and less than or equal to 0.667. The yttrium magnesium gallium aluminum germanium garnet-based red light fluorescent powder provided by the invention can be excited by 225-300nm ultraviolet light and 375-400nm near ultraviolet light, multimodal narrow-band fluorescence emission covering a 585-600nm orange red light region, a 605-630nm positive red light region and a 690-715nm deep red light region is obtained, and the chromaticity coordinate is positioned at (0.6326, 0.3669). Due to the fact that balanced fluorescence emission of a plurality of narrow-band peaks can be achieved in a 585-600 nm orange red light area, a 605-630 nm positive red light area and a 690-715 nm dark red light area, the fluorescent powder is suitable for being applied to optical light source devices such as healthy lighting, plant lighting and temperature detection.

The invention discloses a diazo naphthoquinone type photoinitiator with a polypyrrole unit, and belongs to the field of near ultraviolet photoinitiators. According to the present invention, the polypyrrole unit-diazo naphthoquinone type photoinitiator is synthesized through the simple and efficient method, the ultraviolet visible absorption peak value of the photoinitiator is 355-450 nm, the half peak width is about 50-58 nm, the near ultraviolet absorption requirement is completely met, and the near ultraviolet light initiator can initiate the monomer polymerization under the near ultraviolet light irradiation so as to be used as the photocuring material.

The invention provides near-infrared fluorescent powder, a preparation method thereof and a luminescent material. The chemical formula of the near-infrared fluorescent powder is Bi < 3-x > Ln < x > B < 1-y > Sb < 2 > CryO < 11 >, wherein 0 lt; x is less than or equal to 1, 0lt; y is less than or equal to 0.10, Ln comprises any one or a combination of at least two of Nd, Er or Yb, and B is a trivalent doped metal element. Yb < 3 + >, Nd < 3 + > and Er < 3 + > with efficient near-infrared light-emitting energy levels in trivalent rare earth ions Ln < 3 + > are utilized, energy transfer from Cr < 3 + > to Ln < 3 + > is designed, the near-infrared fluorescent powder capable of emitting in multiple wavebands in a near-infrared region is obtained in a garnet type matrix, the emission range is expanded, the emission band is widened, and the emission efficiency is improved. The near-infrared fluorescent powder realizes broadband absorption in near ultraviolet light and blue light ranges and multiband emission in a near-infrared light region, and has high luminous efficiency and good thermal stability.

An amine compound according to the present invention has a benzazole ring structure represented by general formula (a). The amine compound exhibits excellent stability and durability in thin films, and can provide, through optimization of the molecular design, a material in which the refractive index of visible light is high and the extinction coefficient of light near ultraviolet light is high. By using the compound in a material constituting a capping layer, an organic EL element that has excellent luminous efficiency can be obtained. R1-R4 each represent H, an aryl group, or a heteroaryl group, where at least one of these represents an aryl group or a heteroaryl group. L1-L3 each represent a divalent group such as a phenylene group, X1-X3 each represent O or S, and Y1 and Y2 each represent N or a methine group.

The invention relates to the field of optical elements, and discloses a high-reflectivity optical element based on a magnesium-based reflecting layer, which comprises a substrate layer serving as a support body, a magnesium reflecting layer and a protective layer are sequentially attached to the surface of the substrate layer, and the magnesium reflecting layer is formed by depositing metal magnesium under a vacuum plating process. And the protective layer is deposited on the surface of the magnesium reflecting layer and protects the magnesium reflecting layer. According to the scheme, the ultrahigh reflecting mirror with high reflectivity on the ultraviolet light band and the near ultraviolet light band is obtained by utilizing the high reflectivity of the magnesium metal on the ultraviolet light band and the near ultraviolet light band, meanwhile, oxygen and water vapor are effectively blocked through the protective layer, so that the durability of the reflecting mirror is greatly improved, the durability is verified through a salt spray test and a damp heat test, and the service life of the reflecting mirror is prolonged. After 500 hours, the reflectivity is attenuated by lt; 5%.

The invention provides Ce < 3 + > activated nitrogen oxide cyan fluorescent powder as well as a preparation method and application thereof. The cyan fluorescent powder material can be effectively excited by near ultraviolet light, is high in color purity, can emit bright cyan light under excitation of an n-UV LED chip, shows excellent thermal stability and long afterglow characteristics, and can keep 97% of initial emission intensity at 150 DEG C. Meanwhile, the luminescent temperature measurement material is simple in preparation process operation, low in raw material and equipment cost, environment-friendly, stable in product chemical property and suitable for being widely popularized and used.

The invention discloses a stationary orbit hyper-spectrum detection system applied to high-aging dirt and carbon collaborative observation. According to the method, the problem of performance optimization caused by insufficient observation gas component elements, low spatial resolution, low observation timeliness and system integration of an existing remote sensor is solved. The invention provides a stationary orbit hyper-spectrum detection system for cooperative observation of pollution and carbon, which integrates pollution gas and greenhouse gas detection spectrum sections while exerting the advantage of high-time-efficiency observation of a stationary orbit, and realizes large dynamic range, ultra-high spectral resolution and high-sensitivity detection capability of near ultraviolet to short wave infrared atmospheric absorption spectrum.

The invention provides aluminate near-infrared fluorescent powder as well as a preparation method and application thereof, and belongs to the technical field of inorganic luminescent materials. The chemical formula of the aluminate near-infrared fluorescent powder is CeMgAl11-xO19: xCr < 3 + >, x is more than or equal to 0.02 and less than or equal to 0.2, and the fluorescent powder is the aluminate near-infrared fluorescent powder which is activated by Cr < 3 + > and has a magnetoplumbite structure. The near-infrared fluorescent powder disclosed by the invention is high in quantum efficiency and excellent in thermal stability, can realize efficient luminescence under excitation from near ultraviolet to blue light, and is suitable for the fields of night vision illumination, vein imaging, plant growth light supplement, full-spectrum illumination and the like. The external quantum efficiency of the aluminate near-infrared fluorescent powder can reach 54.7%, the luminous intensity of the aluminate near-infrared fluorescent powder at 225 DEG C can be kept at 82.2% at room temperature, and the aluminate near-infrared fluorescent powder has excellent thermal stability.

The application provides a method for regulating the length of gold nanorods, which adopts light intensity of wavelength of 300 nm or above, including 320-340 nm and / or 530-700 nm, of 50 μw / cm 2 The light source is used to irradiate the gold nanorod dispersion liquid. The method for regulating the length of gold nanorods is performed after the preparation of gold nanorods is completed, mainly utilizes the metal SPR effect and the hot electron effect to realize the oxidation of gold nanorods, controls the light intensity, irradiation time and other parameters of near ultraviolet and / or visible light to realize the control of the length of gold nanorods, meanwhile, the diameter of gold nanorods is basically unchanged, the operation is simple, and no external additives are introduced.

The invention discloses fabric fuzzing and pilling testing equipment based on an image and a testing method thereof, and belongs to the technical field of textile detection. The equipment comprises a rack, a rolling box with a cork lining, an environment regulation and control module and an image acquisition and processing system. The environment regulation and control module forms micro-positive pressure and directional airflow in the rolling box through an ion fan and an exhaust fan, so that friction static electricity is neutralized in real time, fiber chippings are removed, and the test environment is purified from the source. The image acquisition and processing system adopts D65, near ultraviolet and near infrared multispectral light sources for time-sharing illumination, and combines an unsupervised differential segmentation algorithm and a machine learning model to realize accurate segmentation, feature extraction and intelligent rating of a pilling area. According to the method, active environment regulation and control and objective quantitative analysis of results in the testing process are achieved, the accuracy, consistency and efficiency of rating are remarkably improved, and the defects that traditional manual visual evaluation is high in subjectivity and poor in repeatability are overcome.

This invention discloses a Sham lens and electronic device for near-ultraviolet point light source detection. The lens comprises twelve lenses arranged sequentially along an optical axis from the object side to the image side, all of which are spherical lenses. Specifically, the first lens has positive refractive index, with a planar object side and a convex image side; the second lens has positive refractive index, with a convex object side and a concave image side; the third lens has positive refractive index, with a convex object side and a concave image side; the fourth lens has positive refractive index, with a convex object side and a concave image side, and so on. This optical system, through a series of targeted designs including a global surface design, high relative illumination, optimized structural compactness and back focal space, precise matching of the Sham angle, fixed magnification, and compatibility with large-area sensors, achieves significant improvements in imaging performance, system stability, integration convenience, and operational efficiency, meeting the needs of modern high-precision machine vision applications.

The invention provides an aldehyde hydrazone light cage compound which can absorb near ultraviolet light to visible light, and can be subjected to light degradation in a specific wavelength range to release corresponding aldehyde and phenyl compounds. The structure of the aldehyde hydrazone compound can be used as a universal strategy for designing a light release prodrug with high space-time controllability; the material can be degraded by receiving light in vivo and in vitro; and the medicine can also be used as an auxiliary medicine for photodynamic therapy.

This invention relates to the field of empty can sterilization technology and discloses an empty can sterilization device for milk powder production. The device includes a main frame, a protective cover fixedly connected to the end face of the main frame, a conveyor belt rotatably connected to the inner wall of the main frame, an ultraviolet lamp installed on the inner wall of the protective cover away from the conveyor belt, a front frame snapped onto the surface of the main frame near the ultraviolet lamp, and a rear frame inserted into the surface of the main frame away from the front frame. A conveyor control plate is fixedly connected to the inner wall of the front frame. In use, the empty can to be ultraviolet sterilized is placed on the conveyor rod. At this time, the conveyor control plate in the alignment component controls the rotation of the conveyor rod, starting to move the empty can. Simultaneously, the conveyor control plate controls the output pin to rotate along the inner wall of the conical plate seat. When the output pin rotates, it drives the alignment hammer to rotate, which adjusts the empty can on the surface of the conveyor rod, allowing the empty can to stand upright with its opening facing upwards.

The invention relates to near ultraviolet excited silicate matrix blue fluorescent powder for plant illumination and a preparation method of the near ultraviolet excited silicate matrix blue fluorescent powder. The chemical formula of the blue fluorescent powder is Ba < 1.3-x > Ca < 0.7 > SiO4: xEu < 2 + >, the preparation method comprises the following steps: adding Ba (NO3) 2, Ca (NO3) 2.4 H2O and Eu (NO3) 3.6 H2O into deionized water to prepare a solution A; adding an ethyl silicate solution mixed with ethanol into a mixed solution of deionized water, ethanol and ammonia water to obtain a suspension B; adding ammonium bicarbonate into the suspension B, and then adding the solution A to obtain a suspension C; and carrying out a reaction on the suspension C at 200-250 DEG C for 4-16 h, carrying out suction filtration, drying to obtain a precursor, adding a fluxing agent, uniformly mixing, carrying out heat treatment at 1100-1300 DEG C in a reducing atmosphere for 2-10 h, cooling and grinding to obtain a final product. The fluorescent powder is the fluorescent powder with the shortest emission wavelength of a silicate matrix at present, and can reach a 450nm blue light wave band.

The purpose of the present invention is to provide an optical glass which is suitable for molding by reheating treatment and has excellent internal transmittance in a near ultraviolet region, i.e., a wavelength of 320-400 nm. The technical problem is solved by a glass which contains 35.0-70.0% of Si < 4 + >, 10.0-30.0% of B < 3 + >, and 10.0-30.0% of K < + > in terms of cation% (mol%), in which the ratio of the content of Si < 4 + > to the content of B < 3 + > (Si < 4 + > / B < 3 + >) is 2.85 or less, does not substantially contain As < 3 + >, Pb < 2 + >, and R < 2 + > (R < 2 + >: Mg < 2 + >, Ca < 2 + >, Sr < 2 + >, and Ba < 2 + >), and in terms of anion% (mol%), does not substantially contain S < 3 + >, Pb < 2 + >, and R < 2 + >). F-is contained in an amount of more than 0% and 30.0% or less.

The invention discloses a trifluoro-bridged binuclear rare earth complex luminescent material and a preparation method and application thereof, the structural formula of the binuclear rare earth complex luminescent material is [Ln (III) 2L2 (mu2-F) 3] (BPh4) 3, and the chemical structural formula of L is shown in the specification; and the Ln is Eu or Tb. Compared with the prior art, the binuclear rare earth complex has the following advantages: (1) the binuclear rare earth complex can be synthesized through a simple solution method, the preparation process is simple and easy to operate, the energy consumption is low during synthesis, the yield is high, and a pure phase is easy to obtain; and (2) the binuclear rare earth complex respectively emits stronger blue and red fluorescence under the irradiation of an ultraviolet lamp, can be effectively excited in a near ultraviolet region and a purple light region, and respectively has strong emission of 616 nm and 548 nm under 395 nm and 354 nm, the fluorescence quantum yields are respectively 8.99% and 7.40%, and the luminescence lives are respectively 1.46 milliseconds and 1.31 milliseconds.

This invention discloses a method and apparatus for fabricating deep ultraviolet optical thin films based on a stress-compensating superlattice structure, comprising: (1) Stress-compensating superlattice unit (SSC-Unit) design: periodically inserting SSC-Units into deep ultraviolet high-reflectivity or anti-reflectivity film systems, each SSC-Unit consisting of compressive stress material and tensile stress material; (2) Dynamic ion energy modulation deposition: using ion beam sputtering (IBS) deposition technology, the change in substrate curvature radius is measured in real time through a multi-beam laser curvature monitoring system, and the instantaneous stress is calculated based on the Stoney formula. When the stress deviates from the ±20MPa threshold, the ion energy or SSC-Unit insertion frequency is automatically adjusted. This invention has significant stress self-compensation effect, excellent optical performance, and enhanced process robustness. It is not only applicable to the 193nm band, but can also be extended to other deep ultraviolet and near ultraviolet bands such as 248nm and 266nm.

The application provides a kind of Mn 4+ Activated halogen oxide deep red phosphor and preparation method and application, its chemical general formula is: Cs 0.8 K 0.2 Ti 2‑2x Mn 2x O3F2Cl;Wherein, x is Mn 4+ Substituted Ti 4+ Mole ratio, 0.003≤x≤0.02.A kind of oxide precursor including Cs + , K + , Ti 4+ And Mn 4+ Ion is synthesized using wet chemistry, then ammonium fluoride and ammonium chloride are added and combined with solid phase reaction to obtain the final product.The phosphor prepared by the application has effective excitation in the ultraviolet-near ultraviolet-blue light band, and the phosphor can emit red fluorescence with a wavelength range of 600-700nm and a main peak at 630nm.The phosphor is simple to prepare, and has the advantages of raw material economy and environmental friendliness, and can be applied to the preparation of warm white LED lighting or display devices with ultraviolet, near ultraviolet and blue light as excitation light source.

The invention discloses a near ultraviolet excited cyan fluorescent material as well as a preparation method and application thereof, and belongs to the technical field of luminescent materials. The general chemical formula of the fluorescent material is CaLu2-xScZrAl3O12: xCe < 3 + >, x is the doping molar concentration of Ce < 3 + >, and x is larger than or equal to 0.005 and smaller than or equal to 0.12. The material is prepared by adopting a high-temperature solid-phase method, the process is simple, and the cost is low. The material has a wide excitation band in a near ultraviolet to blue light region of 320-475 nm, the peak value is 420 nm, and the wide excitation band is highly matched with the emission spectrum of a commercial near ultraviolet LED chip; under the excitation of 420 nm light, strong broadband cyan light with the central wavelength of 500 nm and the full width at half maximum of about 100 nm is emitted. When x is equal to 0.01, the luminous intensity is the maximum, and the CIE color coordinate is (0.195, 0.358), which is close to ideal cyan. The material has excellent thermal stability, the luminous intensity at 225 DEG C can still be kept at 50% at room temperature, and the thermal quenching activation energy is high. The fluorescent powder is suitable for being combined with red and green fluorescent powder and a near ultraviolet chip to construct a full-spectrum white light emitting diode with a high color rendering index, and has a wide application prospect in the field of high-end illumination and display.

The invention discloses a divalent europium doped phosphorus oxide tetrahedron modified fluorine-chlorine-aluminum ion type scintillation glass ceramic and a preparation method thereof, the chemical formula of the crystal phase of the scintillation glass ceramic is CsAEC13: Eu < 2 + >, AE represents any one element of Mg, Ca and Sr, and blue light emission excited by near ultraviolet light and blue light emission excited by X-ray can be realized by the divalent europium doped phosphorus oxide tetrahedron modified fluorine-chlorine-aluminum ion type scintillation glass ceramic. The crystallization degree of the glass ceramic containing the crystal phase CsAEC13: Eu < 2 + > is 1%-30%, the optical band gap is-5 eV, under excitation of 370 nm ultraviolet light, the internal quantum efficiency and the external quantum efficiency respectively reach 95.2% / 70%, and the emission intensity under excitation of X rays reaches 3.98 times that of commercial bismuth germanate single crystals. The glass ceramic disclosed by the invention has the characteristics of high light-emitting quantum efficiency, high stability and high color purity, and can be applied to the fields of X-ray detection, imaging and the like.

The application discloses a middle-near ultraviolet-to-visible light wide-waveband anti-reflection film layer and a lens, the film layer is arranged on a concave surface of the lens, the film layer comprises a multilayer structure which is stacked in sequence from the concave surface of the lens outwards, and the first layer to the fifth layer of the multilayer structure are a first low-refractive silicon material layer, a second middle-refractive zirconium-titanium material mixed material layer, a third low-refractive silicon material layer, a fourth middle-refractive zirconium material layer and a fifth low-refractive silicon material layer in sequence. Benefited from the second middle-refractive zirconium-titanium material mixed material layer, the film layer can reduce the reflectivity of visible light while reducing the reflectivity of ultraviolet light, and truly realizes the middle-near ultraviolet-to-visible light wide-waveband anti-reflection. The lens covered with the film layer can prevent the secondary reflection of ultraviolet light from entering the eyes, avoid damaging the eyes, improve visual comfort and reduce glare at the same time, and plays an effective role in protecting the eyes.

The application relates to a kind of ultraviolet / violet excitation blue fluorescent material and its preparation method and application.It is Eu 2+ Doped oxide-based blue fluorescent material, chemical formula is BaHfSi2O7:xEu 2+ Wherein, 0.003<=x<=0.02.Compared with the prior art, the violet excitation blue fluorescent material provided by the application is a kind of new, never reported ultraviolet excitation Eu 2+ Doped oxide-based 472nm blue light emitting fluorescent powder, the fluorescent powder has a wide excitation band, the excitation spectrum range covers 200-450nm, the emission spectrum range covers 390-680nm, the fluorescent material emits blue light with the center wavelength located at 472nm under the excitation of 304nm near ultraviolet light, and simultaneously has excellent stability and luminous efficiency.The fluorescent powder can be prepared by conventional solid-phase reaction method, has the characteristics of simple preparation process and easy industrial production, can be combined with near-ultraviolet chip to produce white light, can be widely used as a good candidate material for white LED, and can meet the urgent needs of current healthy lighting LED light source.