102 results about "Near ultraviolet" patented technology

The invention relates to a high-efficiency near-ultraviolet heat exciton compound with circular polarization property and application of the high-efficiency near-ultraviolet heat exciton compound in preparation of a circular polarization organic electroluminescent device, and belongs to the technical field of organic photoelectric materials. The organic electroluminescent material is a high-efficiency near-ultraviolet heat exciton compound with circular polarization property, nine pairs of near-ultraviolet enantiomers are successfully designed and synthesized by combining chiral group binaphthol with fluorene with high luminous efficiency, and the nine pairs of near-ultraviolet enantiomers all show obvious circular polarization luminous property and high fluorescence quantum yield. The electroluminescent devices prepared based on the nine pairs of near ultraviolet enantiomers all show near ultraviolet emission, and the external quantum efficiency is 3.9%, 3.1%, 4.5%, 7.5%, 6.3%, 5.0%, 10.3%, 9.2% and 11.6% respectively. A new visual angle is provided for developing a near ultraviolet heat exciton material with circular polarization luminescence and high efficiency at the same time, and 3D and wide color gamut display can be directly achieved in the future.

The present invention discloses a device for detecting the radiation intensity of an ultraviolet lamp, which relates to the technical field of ultraviolet lamp radiation detection. The key technical solutions include: a housing, characterized in that: a detection chamber is provided within the housing, and a rotating mechanism for fixing the ultraviolet lamp is provided within the detection chamber; a photometric measuring platform is further provided on the exterior of the housing, with the measuring end of the photometric measuring platform close to the ultraviolet lamp; the rotating mechanism includes two conductive slip rings, a rotating rod, multiple fixing plates, and multiple lamp fixing slots; the two conductive slip rings are fixedly connected to the top and bottom of the detection chamber, respectively; the top and bottom of the rotating rod are fixedly connected to the output ends of the two conductive slip rings, respectively; and the ends of the multiple fixing plates are fixedly connected to the side walls of the rotating rod. This detection device solves the problem of inspectors being directly exposed to the ultraviolet environment. At the same time, the detection mechanism can simultaneously detect multiple ultraviolet lamps, thereby improving detection efficiency.

The application discloses a chain-like core-shell structure crystal and a preparation method and application thereof, the crystal is chloroethyl HDABCO-sodium bromofluoroborate, a structural formula of the crystal is [CH2ClCH2N(CH2CH2)3NH]4·[(Na6Br)(BF4) 13 ], a molecular structure presents a one-dimensional chain framework with infinite extension, adjacent chains are connected through N-H...F linear hydrogen bonds and chloroethyl-HDABCO, so that the compound has polarity and has a mid-infrared second-order nonlinear effect. In addition, the ultraviolet band edge absorption of the material is close to the near ultraviolet region, so that the material is expected to be close to inorganic ultraviolet nonlinear optical materials. The crystal is obtained through room temperature volatilization crystallization, has good thermal stability, and has potential application values in the fields of laser frequency doubling conversion, electro-optic modulators, deep ultraviolet nonlinear optics and shutter used for high-speed photography.

The invention relates to scheelite matrix non-rare earth activated dark red fluorescent powder. The composition of the material is M3A2 (W, Mo) (1-x-y) O9: xMn < 4 + >, yBi < 3 + >, in the formula, M is any one of alkaline earth metals Ca, Sr and Ba; a is any one of Y, Gd and La; 0 lt; 0 < = y < = 1%. The dark red fluorescent powder provided by the invention is stable in matrix structure and performance, relatively good in physical and chemical stability, stable in luminescence performance, firm and uniform in particle, and relatively high in crystallinity and purity. A tungsten molybdate solid solution is used as a matrix, Mn < 4 + > is used as a luminescence center, Bi < 3 + > is used as a sensitizer, the raw materials are easy to obtain and non-toxic, and the prepared product can effectively absorb near ultraviolet light in the range of 300-400 nm and emit dark red light in the range of 650-700 nm, and has a certain beneficial effect of supplementing red light in the field of current white light LEDs and plant illumination LEDs.

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.

According to the near-ultraviolet excited red fluorescent powder for the LED and the preparation method, the precursor is obtained through coprecipitation, then the solid-phase reaction is carried out, and the near-ultraviolet excited red fluorescent powder for the LED is obtained, and the fluorescent powder prepared through the method is uniform in component and high in crystalline phase purity, luminescence quenching concentration and luminescence efficiency. The method is simple in process, conditions are easy to control, and special and expensive equipment is not needed; the preparation method has the advantages that the preparation process is simple, the yield is high, the repeatability is good, the pure-phase Zr < 1-2x > Nb < x > Eu < x > TiO4 micron-sized powder with higher luminance can be obtained, and the obtained Zr < 1-2x > Nb < x > Eu < x > TiO4 fluorescent powder can meet various application requirements, so that the Zr < 1-2x > Nb < x > Eu < x > TiO4 fluorescent powder can be widely applied to the fields of illumination, display, biomedicine and the like.

The invention discloses a spiral chiral gold nanorod as well as a preparation method and application thereof, and the method comprises the following steps: (1) sequentially adding hexadecyl trimethyl ammonium bromide, cysteine and p-aminothiophenol into an anisotropic gold nanorod solution, uniformly mixing, and adsorbing; and (2) silver nitrate, chloroauric acid and ascorbic acid are added for a reaction, centrifugal dispersion is performed after the reaction is finished, and the spiral chiral gold nanorod is obtained. Dispersing the spiral chiral gold nanorod in an aqueous solution, adding phenylalanine enantiomer, dropwise adding on a clean glass slide after incubation is finished, and performing surface enhanced Raman spectroscopy test by using a Raman microscope after air drying. According to the invention, the broadband coverage of chiral response from visible light to near ultraviolet region is realized by accurately regulating and controlling the arrangement of interface molecules and the morphology of the nano structure.

The reaction of sodium hypochlorite with sodium bromide is slow, and commonly only part of the bromide is converted to hypobromite. Methods to accelerate the reaction by adding a regulated amount of acid to a solution comprising bleach and bromide are provided, whereby the yield of hypobromite can be increased. The amount of acid added can be predetermined based on the content of a base in the bleach, and acid can be added to neutralize the base. The amount of acid added can be based on a measured parameter of the reaction that is indicative of reaction kinetics. For example, the amount of acid can be actively controlled by measuring pH, absorbance of visible or near Ultraviolet light, or temperature of the reacting solution and adjusting acid.

The invention provides a yellow fluorescent material capable of being excited by near ultraviolet light and visible light and a preparation method of the yellow fluorescent material, the method comprises the following steps: providing raw materials which comprise the following components in parts by weight: 0.3524 to 0.3564 part of K2CO3, 0.7012 to 0.7386 part of SrCO3, 0.5250 to 0.5368 part of Y2O3, 2.1586 to 2.1596 part of MoO3 and 0.0466 to 0.0839 part of Dy2O3, and uniformly mixing the components; heating the raw materials to a preset temperature, and keeping the temperature; and cooling to obtain the yellow fluorescent material capable of being excited by near ultraviolet light and visible light. The method is simple to operate, a fluxing agent does not need to be additionally added, the excitation wavelength required by the prepared fluorescent powder is located in the near ultraviolet-visible light wave band, the half-peak width of emitted light is narrow, and the color purity is high.

The invention provides an Eu < 3 + >-doped orange red luminescent material as well as a preparation method and application thereof, and belongs to the technical field of inorganic luminescent materials. The chemical formula of the orange red luminescent material is Ba4Sr0. 5Ca0. 5MgAl2W2O15: xEu < 3 + >, x is the mole number of barium ions Ba < 2 + > replaced by europium ions Eu < 3 + >, and x is larger than or equal to 0.04 and smaller than or equal to 0.32. The orange red luminescent material belongs to a typical cubic perovskite structure, can be excited by ultraviolet-near ultraviolet with a wavelength interval of 240-430 nanometers, and correspondingly emits a sharp linear spectrum with a wavelength peak value at 587 nanometers. The orange red luminescent color is pure in chromaticity, and can be packaged with ultraviolet and near ultraviolet semiconductor chips to prepare orange red or polychromatic light LED lighting devices. The fluorescent powder is synthesized by using a sol-gel method, a single cubic perovskite structure can be ensured, and the preparation method has the advantages of easily available raw materials, good repeatability, low cost and no pollution.

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 invention belongs to an organic field effect transistor, and particularly relates to an organic semiconductor heterojunction photon synapse transistor and a preparation method thereof. The organic semiconductor heterojunction photon synapse transistor comprises a source electrode, a drain electrode, an organic active layer, a gate insulating layer and a gate electrode, the organic active layer is composed of an N, N '-disalicylidene group-1, 3-diaminopropane layer and a pentacene layer. The transistor provided by the invention has good transistor field effect and photon flash memory performance, has good light control synapse performance, and can realize various types of light synapse functions. And the device is mainly dominated by NSP, the photoresponse rate and the photoresponse dynamic range at 435 nm are maximum, and the near ultraviolet light can be well identified. Due to the relative stability of the small molecule material, the performance of the device does not decline within the temperature range of 120 DEG C, and meanwhile self-adaptive learning can be achieved at different temperatures.

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 the technical field of luminescent materials, and particularly discloses a red luminescent material as well as a preparation method and application thereof. The red luminescent material takes titanate as a matrix and Eu as a doping element, the chemical general formula of the red luminescent material is Na2TiO3: xEu < 3 + >, and x is more than or equal to 0.0125 and less than or equal to 0.05. The red luminescent material is a near ultraviolet excited europium-doped titanate material and has the advantages of high luminous intensity, stable luminous efficiency and low preparation cost, the wavelength range of the red luminescent material is wide, and the LED lamp prepared from the red luminescent material can meet the requirements of plant growth. The invention effectively solves the problems of high preparation cost, low luminous intensity and unstable luminous efficiency of the red light material used by the existing plant growth LED lamp.

A dual game dice game system includes a dual game dice game table having a layout configured to enable a player to personally become a thrower of a game dice on the dual game dice game table. The dual game dice game system further includes one or more player consoles, each player console configured to accommodate a player, each player controller configured to enable a player to select a dual game dice game played on a layout of the dual game dice game table; one or more near ultraviolet cameras positioned to view the game dice above the layout; one or more near ultraviolet lamps that irradiate the game dice on the layout and output optical data; and a computing device that receives and analyzes the optical data and determines the outcome of the game dice.

The utility model relates to a photocatalytic ozone catalytic oxidation device which comprises a gas dissolver for mixing water and ozone into a mixed solution; the photo-catalytic oxidation reaction unit comprises a plurality of photo-catalytic tubes, the photo-catalytic tubes are used for carrying out turbulent flow on the mixed liquid, and first reaction liquid is formed after photo-catalytic oxidation; and the ozone catalytic oxidation reaction unit is used for performing ozone catalytic oxidation on the first reaction liquid. The photocatalytic tube is arranged, so that the turbulent flow effect on liquid is enhanced, ultraviolet penetration is facilitated, a photocatalyst on each surface of the catalyst sleeve is irradiated by adjacent ultraviolet rays in the photocatalytic oxidation reactor, the utilization area of the photocatalyst is increased, and the ozone utilization rate and the COD removal efficiency are further improved; further, the usage amount of the catalyst in the catalytic ozonation reactor is reduced, and the problem of deposition caused by excessive catalyst is avoided.

The invention discloses a preparation method and application of amide-silanized fluorescent nano-clusters (SiANs), and belongs to the crossing field of nano functional materials and agricultural technologies. The silicon-based nano-cluster with the fluorescence characteristic is assembled through double-interface engineering of ammonium carboxylate and an amino functional group silane derivative, and the material is synthesized by adopting a hydrothermal method. The method has the advantages of mild reaction conditions, simplified process steps and low energy consumption, the average particle size of the prepared nano-cluster material is 2.29 nm, and the nano-cluster material has near ultraviolet region fluorescence emission characteristics, good carbon dioxide adsorbability and good biocompatibility. Compared with a blank group, the plant height and the root length of wheat seedlings in a 5mg / L SiANs treatment group are increased by 20% and 80% respectively, and the dry weight and the fresh weight of the plants are increased by 25% and 15% respectively.

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 near ultraviolet alpha radiation detection objective lens comprises an aberration correction lens group, an aperture diaphragm, a field diaphragm and an optical filter group, wherein the lens group is composed of two aspherical lenses and two spherical lenses, the optical filter group is composed of three narrow-band optical filters, and the field diaphragm comprises four levels of light blocking rings. A radiation light beam of an imaging target enters the optical system through the lens, the aperture diaphragm limits the aperture of the light beam, the field diaphragm limits the light beam imaging field and inhibits stray light at the same time, and finally light with detection wavelength is converged to an image plane through the optical filter set for imaging. The invention has the advantages of large relative aperture, large field of view, good imaging quality, high energy collection rate and the like. The stray light is suppressed through the combined effect of the field diaphragm and the optical filter group, and long-distance non-contact detection of alpha radiation in a bright background scene can be realized.

The invention discloses a polypeptide nanoring material and a preparation method thereof, and belongs to the technical field of high polymer materials. The preparation method comprises the following steps: co-assembling poly (gamma-benzyl ester-L-glutamic acid) (PBLG) and achiral triphenylamine derivatives {N, N-bis (2-methylphenyl) aniline (MTPA), 4-(5-aldehyde-2, 2 ': 5', 2 ''-terthienyl)-N, N-bis (2-methylphenyl) aniline (MTTH) or 4-[5-(2, 2-dicyanovinyl) thiophene-2-yl]-N, N-bis (2-methylphenyl) aniline (MTTV)} to obtain the poly (gamma-benzyl ester-L-glutamic acid)-N, N-bis (2-methylphenyl) aniline derivative. According to the present invention, the emission of multi-color circularly polarized light (CPL) (near ultraviolet to deep red light, 370-660 nm) is achieved, and the maximum luminescence asymmetry factor (glum) is up to 1.1 * 10 <-2 >, and is improved by more than 30% compared with the prior art. Meanwhile, the generation inhibition rate of reactive oxygen species (ROS) is increased to 98% or above through a compact nanostructure of the material, the problem of phototoxicity of traditional triphenylamine derivatives is solved, and the material is suitable for high-resolution biological imaging and targeted diagnosis and treatment.

The invention relates to the technical field of optoelectronic materials, in particular to a single-matrix triple-doped white fluorescent material and a preparation method thereof, the chemical composition expression of the single-matrix triple-doped white fluorescent material is M1-x-y-zAl2O4: xCe < 3 + >, yTb < 3 + > and zMn < 2 + >, three ions of Mn < 2 + >, Ce < 3 + > and Tb < 3 + > are jointly doped into an MAl2O4 (M = Mg, Ca, Sr and Ba) aluminate matrix, the doping concentrations of Ce < 3 + >, Tb < 3 + > and Mn < 2 + > are accurately regulated and controlled (0.005-0.03, 0.02-0.1 and 0.01-0.1 respectively), and the single-matrix triple-doped white fluorescent material is obtained. According to the method, Mn < 2 + > occupies specific sites in a matrix crystal structure, the peak value of an emission spectrum of the Mn < 2 + > is accurately regulated and controlled at a red light wave band of 620-700nm, and meanwhile, a three-doped system capable of realizing efficient energy cascade transfer in a single matrix is successfully constructed by virtue of efficient absorption of Ce < 3 + > on 350-420nm near ultraviolet light, energy transfer from Ce < 3 + > to Tb < 3 + > and final energy transfer from Tb < 3 + > to Mn < 2 + >. Therefore, the fundamental technical obstacle that in the prior art, it is difficult to achieve efficient synergistic luminescence in a single matrix through multi-ion combination is solved.

The invention belongs to the technical field of semiconductor material detection, and particularly discloses a method and system for representing nitrogen doping concentration uniformity of a silicon carbide wafer, and the method comprises the steps: carrying out the polishing and surface cleaning treatment of the silicon carbide wafer to be detected, and enabling the surface roughness and thickness change of the silicon carbide wafer to meet the set requirements; and acquiring a near ultraviolet photoluminescence channel image on the surface of the silicon carbide wafer to be detected, and judging whether the nitrogen doping concentration of the silicon carbide wafer is uniform or not according to the mapping intensity of the near ultraviolet photoluminescence channel image. The method has high sensitivity in the aspect of non-uniformity detection of the nitrogen doping concentration in the local tiny area of the silicon carbide wafer.

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 invention provides a preparation method of an epoxy mercaptan polymer dispersed liquid crystal film with low volume shrinkage, and belongs to the technical field of liquid crystal products, and the preparation method comprises the following steps: S1, uniformly mixing liquid crystal, a monomer component and a photo-alkali generator in a dark environment to obtain a mixture; wherein the monomer component comprises an epoxy monomer and a thiol monomer, and the ratio of epoxy to thiol functional groups is 1: 1; s2, the mixture obtained in S1 is poured into a liquid crystal box and then placed in the environment at 90 DEG C for 2 h, ultraviolet light or near ultraviolet blue light is used for illumination in the first 20 min, and the low-volume-shrinkage epoxy thiol polymer dispersed liquid crystal film is obtained. According to the invention, the photo-generated alkali agent generates strong alkali under illumination to initiate the click reaction of epoxy and mercaptan, so that the contrast ratio and the adhesion property are greatly improved, and the volume shrinkage rate of a polymerization system can be reduced. By introducing a rigid structure, the volume shrinkage of a polymerization system is further reduced.

The invention discloses near ultraviolet excited niobium-based garnet broadband near-infrared fluorescent powder, which is characterized in that the chemical composition expression formula of the fluorescent powder is LuCa2Ga4-xNbO12: xCr < 3 + >, x is the substitution amount of Cr, and x is more than or equal to 0 and less than 1. The fluorescent powder can be excited by 250-700nm near ultraviolet-visible light, the emission peak covers 600nm-850nm, the near infrared luminous intensity of the fluorescent powder under the excitation of near ultraviolet light is far higher than the luminous intensity of the fluorescent powder under the excitation of blue light, the near ultraviolet excitation peak intensity is far higher than the blue light excitation peak intensity, and the fluorescent powder can be used for preparing the fluorescent powder. The fluorescence lifetime under near ultraviolet excitation is longer than the fluorescence lifetime under blue light excitation, and the material can be used in the fields of medical imaging, key information identification, plant growth illumination and the like, and can be used as a near-infrared light conversion material excited by near ultraviolet and blue light LED chips.

The invention provides an Eu < 3 + > / Mn < 4 + > co-doped luminescent material as well as a preparation method and application thereof, and relates to the technical field of luminescent materials. The chemical general formula of the Eu < 3 + > / Mn < 4 + > co-doped luminescent material is Mg2La1-xSb0. 998Mn0. 002O6: xEu < 3 + >, and x is more than or equal to 0.02 and less than or equal to 0.12. The luminescent material provided by the invention can be effectively excited by ultraviolet-near ultraviolet light (230-450 nm) and blue light (460 nm), has an ultra-wideband excitation spectrum (230-580 nm), and can be matched with a near ultraviolet LED chip or a blue light LED chip for use. The luminescent material prepared by the invention can be applied to the field of temperature measurement and control and can also be widely applied to the field of indoor illumination of plants.

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 a preparation method of a fluorescent temperature measurement material with high sensitivity, the fluorescent temperature measurement material has the following general formula: A4B2M1-xO6F: xMn < 4 + >, where A metal is one or more of elements Na, Li and K; the metal B is one or more of Mg, Zn and Ca; m metal is one or two of elements Nb and Sb; and the doping amount x of Mn < 4 + > is greater than or equal to 0.05 mol% and less than or equal to 1mol%. The material can be effectively excited by near ultraviolet or visible light, and is high in color purity, good in luminescence detectability, simple in preparation process operation, low in raw material and equipment cost, environment-friendly, stable in product chemical property and suitable for general popularization and application.

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.