45 results about "Thermal quenching" patented technology

This application discloses a high quantum efficiency near-zero thermal quenching far-red light-emitting plant supplement phosphor and its application. It is prepared by a high-temperature solid-state method and has the composition A2CaBi. 2‑x La x (PO4)2(P2O7):20%Eu 3+ , 0≤ x ≤20%, A = Cs, Li, Na, K, or Rb. This series of phosphors uses Eu as the base. 3+ As the light-emitting center, through La 3+ Effective control of the matrix crystal field to optimize Cs2CaBi 2‑x La x (PO4)2(P2O7) crystal structure, enhancing Eu 3+ Far-red light emission performance.

This invention discloses a microcrystalline composite glass fiber with zero thermal quenching of yellow light and its preparation method; the cladding of the microcrystalline composite glass fiber is quartz glass, and the core is SiO2 composite Dy 3+ Doped Gd3ScGa4O 12 Microcrystalline glass. The fabrication process of this optical fiber includes: first, acid washing and drying of a quartz glass tube, followed by sealing one end with a tapered end; then, adding Gd... 3‑x ScGa4O 12 : x Dy 3+ A ceramic core rod is placed inside a quartz glass tube to form an optical fiber preform. Finally, the preform is drawn into fibers at high temperature to obtain the microcrystalline composite glass fiber with zero thermal quenching of yellow light. The microcrystalline composite glass fiber prepared by this invention can maintain stable yellow light emission under high-temperature conditions, with no thermal attenuation in intensity and no significant shift in the emission center, and can be used for Dy... 3+ Doped yellow fiber lasers provide an efficient and stable gain medium, which is conducive to the miniaturization of devices and is expected to enable direct output of high-power yellow lasers.

The invention relates to the technical field of fire extinguishing control, in particular to a perfluorohexanone and hot aerosol composite synergistic fire extinguishing method and system.The method comprises the steps that in the initial response stage of a fire, fire scene multi-dimensional data in a protection area are collected in real time; wherein the fire scene multi-dimensional data comprises flame optical radiation multi-dimensional spectrum data, heat flow field vector distribution data, oxygen concentration attenuation gradient data and environment pressure pulsation data; based on the transition intensity of a free radical characteristic peak in a flame optical radiation multi-dimensional spectrum, the turbulence characteristic of vector distribution of a heat flow field is combined. According to the method, the boundary of the Stefan flow rejection effect and the Arrhenius thermal quenching effect is quantified by calculating the confrontation loss value and the synergistic interaction compensation window, and the specific interval of which the transmission gain is greater than the confrontation loss is searched on the time axis, so that the cooling capacity of the perfluorohexanone is utilized, and the transmission gain of the perfluorohexanone is improved. The inhibition peak value on the chemical activity of the aerosol is avoided, and the synergistic fire extinguishing of the two medicaments is ensured.

The invention relates to the technical field of high-flux photonics materials, in particular to a Sb < 3 + >-doped Cs3LnCl6 zero-dimensional nanocrystal as well as a preparation method and application thereof. The chemical formula of the Sb < 3 + >-doped Cs3LnCl6 zero-dimensional nanocrystal is Cs3Ln1-xSbxCl6, x ranges from 0.005 to 0.1, Ln is selected from at least one of Y, Nd, Sm, Eu, Gd, Tb, Dy, Ho, Er, Tm, Yb and Lu, and the Sb < 3 + >-doped Cs3LnCl6 zero-dimensional nanocrystal has the chemical formula of Cs3Ln1-xSbxCl6. The material has a zero-dimensional structure of a C2 / c space group, and is composed of an isolated [BCl6] 3-octahedron and a gap Cs < + >, the zero-dimensional nanocrystal has a deep trap state of 0.6 eV to 1.2 eV. Through zero-dimensional [BCl6] 3-octahedron lattice rigidity and deep trap carrier recovery, high-temperature anti-thermal quenching can be realized without external coating, and the problem of external passivation-performance side effects of the existing material is solved.

The utility model belongs to the technical field of metal quenching, in particular to metal quenching equipment for metal heat treatment, which is characterized in that one side of a connecting box is fixedly connected with a first motor, the output end of the first motor is fixedly connected with a threaded rod, the surface of the threaded rod is movably connected with a running component, and the bottom end of the connecting box is fixedly connected with a heating box. The electric push rod pushes the movable plate to drive the connecting rod and the clamping pincers to rotate synchronously, the clamping pincers clamp the placing frame, and meanwhile the first motor drives the threaded rod to move the movable block to achieve the effect of adjusting the horizontal position of the placing frame. Meanwhile, the vertical position of a placing frame can be adjusted through an electric telescopic rod, so that the metal part in the placing frame is automatically heated and quenched, then a second motor drives fan blades to rotate to absorb oil fume in a connecting box, and meanwhile, the oil fume is purified through an activated carbon frame and then is exhausted out of the device through an exhaust pipe; the purification and emission effects on the oil smoke are achieved.

This invention relates to a novel CdS quantum dot glass, its preparation method, and its application in a light source. The basic glass raw materials are composed of the following mass percentages: black talc powder: 55–70 wt.%; K₂CO₃: 5–15 wt.%; Li₂CO₃: 5–15 wt.%; SrCO₃: 5–10 wt.%; H₃BO₃: 5–20 wt.%; CdS: 1–15 wt.%; the content of the external rare earth compound is 0–2 wt.% of the total mass of the other raw materials (black talc powder + K₂CO₃ + Li₂CO₃ + SrCO₃ + H₃BO₃ + CdS); the content of the external clarifying agent is 0.2–2 wt.% of the total mass of the other raw materials (black talc powder + K₂CO₃ + Li₂CO₃ + SrCO₃ + H₃BO₃ + CdS). This invention relates to the field of glass materials technology. The raw materials used in its preparation are readily available, the process is simple, and it is easy to industrialize. The resulting CdS quantum dot glass can be effectively excited by 395nm violet light and has the characteristics of high luminous efficiency, excellent resistance to thermal quenching, and adjustable light color. The encapsulated white light source has the characteristics of warm white light output, high color rendering index, and high lumen efficiency.

The application provides a near-infrared luminescent material with ultrahigh temperature, zero loss and quantum yield close to 100%, and a preparation method and application thereof, and belongs to the technical field of luminescence, lighting and analysis and detection. The application takes a compound with a garnet structure as a substrate of the near-infrared luminescent material, the substrate compound has the advantages of a wide band gap, high structural rigidity and adjustable composition, and is easy to induce Cr 3+ to generate high-efficiency near-infrared emission; by introducing Si or Ge, the near-infrared luminescent material with high structural rigidity and high Debye temperature can be obtained, so that the luminescence thermal stability is improved. The results of the examples show that the near-infrared luminescent materials obtained by doping different proportions of Cr 3+ have anti-thermal quenching (about 187% at 150 DEG C) and high quantum yield (about 99%); and the output power of a near-infrared pc-LED light source prepared by using the near-infrared luminescent material and a blue light LED chip is up to 250 mW under a driving current of 100 mA.

This application provides an integrated temperature-sensitive thermal barrier protection A2B2O7 ceramic material, its preparation method, and its application, which possesses A... 2‑ a The B2O7:aX material has a general structural formula and a crystal structure that is defective fluorite, pyrochlore, or a mixed two-phase structure. Doping with two or more types of luminescent ions allows for temperature measurement based on the fluorescence intensity ratio of non-thermally coupled energy levels, overcoming the limitations of relative sensitivity in traditional thermally coupled energy level temperature measurement. It utilizes the anti-thermal quenching or low-thermal quenching effects of the luminescent ions to extend the upper limit of temperature measurement, and the different temperature response characteristics of different luminescent ions enhance relative sensitivity. This material can be directly used to prepare a dual-function integrated coating for temperature sensing and thermal barrier protection, eliminating the difficulties of externally mounted sensors, avoiding damage to the coating integrity, and simplifying the complex layout of functional layers. It achieves the integration of thermal barrier protection and high-temperature sensing functions, providing a forward-looking solution for the safety assurance and condition monitoring of components operating in extreme high-temperature environments such as aero-engines and gas turbines.

The invention discloses a copper-based luminescent material with a negative thermal quenching characteristic and a preparation method thereof, and belongs to the technical field of photoluminescent materials. The copper-based luminescent material is a complex, the chemical formula of the copper-based luminescent material is [(bma) (POPY) CuI] n, n is larger than or equal to 1, a ligand bma is 1, 1 '-[[1, 1'-biphenyl]-4, 4 '-diyl bis (methylene)] bis [2-methyl-1H-imidazole], the copper-based luminescent material belongs to a triclinic system, the space group is P-1, crystal parameters are that alpha is 79.684 (2) degrees, beta is 83.443 (2) degrees, gamma is 69.954 (2) degrees, and Z is 2, raw materials are easy to obtain, the synthesis method is simple, and the yield is high; the material can efficiently emit light at room temperature, and the luminous intensity is continuously increased within the temperature range of 100K-400K along with the rise of the temperature; the preparation of the Cu (I)-organic framework with high emissivity is promoted, the research on functional metal complexes is inspired, and the Cu (I)-organic framework is expected to become a reform material in the fields of illumination, biomedical treatment and information safety.

The invention discloses yellow fluorescent powder with high thermal quenching performance and belongs to the field of fluorescent materials. The fluorescent powder is prepared by adopting a Ce permeation process and can be represented by a chemical formula of 3Y2O3. 5Al2O3. 0.02 CeO2. Under the excitation of 450 nm blue light, the main peak of the emission spectrum of the fluorescent powder is 545 nm, the luminous intensity at 150 DEG C is 92.5% of that at room temperature and is increased by about 4% compared with that of the conventional Y3Al5O12: Ce < 3 + > fluorescent powder, and meanwhile, the use amount of rare earth Ce is reduced; and the external quantum efficiency is about 82.6%, so that the fluorescent powder can be applied to packaging of white light LEDs.

This invention discloses a substitutional nanocrystalline reinforced quench-resistant scintillation glass and its preparation method. This scintillation glass consists of a glass phase and (Sr) 1‑x‑2y‑2z M x Ln y Tb z Na y+z It is composed of AlF5 nanocrystalline phase; among which, (Sr 1‑x‑2y‑2z M x Ln y Tb z Na y+z The volume fraction of the AlF5 nanocrystalline phase is 15-35%, and the volume fraction of the glass phase is 65-85%. This invention uses perfluoride as the glass matrix and employs a two-step heat treatment process involving high-temperature melting and nucleation / crystallization to prepare a substitution-type nanocrystalline reinforced quenching-resistant scintillation glass. The prepared scintillation glass exhibits photoluminescence and radiative emission with quenching-resistant properties, high quantum efficiency and light yield, and stable imaging capability under high-temperature X-ray irradiation, making it suitable for the field of high-temperature scintillators.

The application relates to the fields of optics and fire rescue, and discloses a fluorescent conversion sheet with wavelength conversion function and a handheld smoke penetration imaging device. The fluorescent conversion sheet comprises, in sequence, a heat dissipation substrate layer, a mirror layer, a photonic crystal layer and a core-shell structure fluorescent layer. After short-wave near-infrared laser is incident, the core-shell structure fluorescent layer performs wavelength conversion; the mirror layer and the photonic crystal layer form an optical micro resonant cavity, and the unconverted laser is reflected back to the fluorescent layer for secondary conversion; and the heat dissipation substrate layer effectively suppresses the thermal quenching effect. The imaging device utilizes the fluorescent conversion sheet to efficiently convert the easily obtained short-wave near-infrared laser into middle-wave near-infrared laser with strong smoke penetration capability and safety to human eyes and emits the middle-wave near-infrared laser, and a receiving device containing a polarizer is used to image the target echo. Through systematic and synergistic optimization design, the conversion efficiency and thermal stability are greatly improved, excellent smoke penetration imaging effect is realized, and the safety and efficiency of fire rescue are improved.

The application discloses a temperature sensing material based on double-mode thermal response up-conversion luminescence and a preparation method and application thereof, and belongs to the technical field of optical temperature sensing. 4‑y Ti 0.5 M 0.5 O8X:REy; wherein, M is W or Mo, X is Cl or Br, RE is Er or Yb / Er, and a hydrothermal-molten salt method is adopted to prepare the material by using a string joint strategy. Different from traditional thermal quenching materials, the double-mode thermal response up-conversion luminescence temperature sensing material Bi4Ti 0.5 M 0.5 O8X can weaken visible light and enhance 800nm near-infrared light at the same time as temperature rises. By utilizing the characteristics that the up-conversion luminescence intensity has opposite responses to temperature changes, the up-conversion temperature sensing material has high optical temperature sensitivity in a fluorescence intensity mode and a fluorescence lifetime mode, is a wide temperature measurement range optical temperature sensing material that can be used for high-temperature environment detection, and has great application potential in the field of optical temperature sensing.

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.

This invention discloses a thermochromic luminescent material, its preparation method, and its applications. The general chemical formula of the thermochromic luminescent material is RbCd. (1‑x) Mn x Cl3; x is the mole fraction, with a value ranging from 0 < x ≤ 15%. The thermochromic luminescent material provided by this invention exhibits significant thermochromic luminescence characteristics. At room temperature, RbCd... (1‑x) Mn x Cl3 belongs to the orthorhombic crystal system with space group Pnma. Under ultraviolet light irradiation, it exhibits red light emission. When RbCd... (1‑x) Mn x When Cl3 is heated to above 420K, its crystal structure changes to a tetragonal system with a space group of P4 / mbm, exhibiting yellow light emission. Furthermore, the fluorescence intensity of this thermochromic luminescent material increases with increasing temperature during the temperature variation process from 160K to 420K, demonstrating a significant resistance to thermal quenching. In addition, this invention provides a simple synthesis process with mild reaction conditions, abundant and inexpensive raw materials, solving the problems of lead toxicity and instability in lead-based halide crystals, and is expected to be widely used in intelligent responsive luminescence, anti-counterfeiting, and temperature measurement fields.

The application provides a white light phosphor powder based on copper-iodine organic hybrid clusters and a preparation method thereof, and has a structure shown in formula I. The structure of the white light phosphor powder in the application is that Cu4I4 is used as an inorganic core, and copper atoms are coordinated with nitrogen and phosphorus atoms on ligands to form a stable and unique cluster structure. The light emitting mechanism of the cluster is charge transfer from the inorganic core to the ligand, and the simple core and the ligand cooperate with each other to form degenerate emission energy levels, so that white light emission with double wide peaks from 400 to 800 nm is realized. The light emitting quantum yield reaches 97.8%. The material also exhibits excellent stability, and the thermal decomposition temperature is as high as 265 DEG C. The material also has low thermal quenching, and still maintains more than 80% of the original light emitting quantum yield under the condition of 240 DEG C. The application also provides an application of the white light phosphor powder based on copper-iodine organic hybrid clusters. The white light phosphor powder is applied to the field of solid state lighting, and has significant advantages and application prospects.

The application discloses a kind of anti-thermal quenching fluorescent powder and its preparation method and application, belong to thermal imaging field.The application is with ZrMgMo3O 12 As matrix, by doping rare earth element Dy to obtain general formula ZrMgMo3O 12 :Dy yellow light fluorescent powder, realize anti-luminescence thermal quenching by energy transfer between rare earth element Dy and matrix and defect effect, using 292nm, 360nm, 393nm, 471nm light source excitation, by detecting the intensity and wavelength of fluorescence, to obtain temperature distribution image.Fluorescent powder preparation method is as follows: Dy2O3 is added in the mixture of ZrO2, MgO, MoO3 respectively, grinding is obtained after adding ethanol mixture A;Then calcine mixture A obtains ZrMgMo3O 12 :Dy fluorescent powder.

The invention relates to a preparation method of a porous fluorescent ceramic material. LuAG: Ce < 3 + > powder is used as a luminescent matrix, polymethyl methacrylate (PMMA) spherical particles are used as a pore forming agent, and the porous fluorescent ceramic is prepared through silane coupling agent modified PMMA, LuAG: Ce < 3 + > powder pretreatment and in-situ electrostatic adsorption compounding, dry pressing-cold isostatic pressing molding and two-step sintering. The material is uniform in pore structure and free of agglomeration, the light extraction efficiency is increased by more than 20% compared with that of traditional compact ceramic, light emission is uniform and free of yellow ring color spots, the material can be compatible with a high-power laser service environment, and the problems that existing fluorescent ceramic is poor in light emission uniformity, low in light extraction efficiency and the like are effectively solved. The porous fluorescent ceramic material has the characteristics of high quantum efficiency, low thermal quenching and excellent thermal stability, is suitable for high-end laser illumination scenes such as automobile headlamps, laser projection and long-distance illumination, and has wide practical application value.

The application provides a metal product quenching process monitoring system and method, relates to the field of metal processing, and obtains a finished metal by obtaining a forged metal and preheating, quenching heating, quenching cooling, low-temperature tempering and cleaning and rust-proof treatment of the metal. The quenching cooling needs to obtain a time queue of real-time metal temperature, real-time cooling medium temperature and real-time cooling medium pressure, then perform time sequence implicit coding, feature splicing and bidirectional interaction response representation on input data, automatically recommend a cooling medium flow rate for comparison with a real-time flow rate, and generate a cooling medium flow rate adjustment instruction. In this way, the adaptability and dynamic response capability of the system can be improved, the stability and consistency of the cooling effect can be ensured, the cooling conditions can be adjusted in a timely manner, and the internal stress problem caused by inconsistent cooling speeds can be avoided.

The invention discloses red light-emitting Sb < 3 + >-containing inorganic fluorescent powder with thermal quenching resistance and a preparation method of the red light-emitting Sb < 3 + >-containing inorganic fluorescent powder. The general chemical formula of the fluorescent powder is Ca < 14 > Zn < 6 > Ga < 10-x-y > O < 35 >: xMn, ySb, wherein 0 < = x < = 0.83, and 0 < = y < = 0.4. According to the invention, Sb < 3 + > is introduced into the Ca14Zn6Ga10O35: Mn inorganic fluorescent powder with red luminescence, so that a sample shows excellent thermal quenching resistance. The red luminescent Sb < 3 + >-containing inorganic fluorescent powder pure-phase sample with thermal quenching resistance is prepared by using a high-temperature solid-phase method, and the preparation method is simple and efficient, does not generate waste liquid and waste gas, and is suitable for mass production.

The invention relates to the technical field of quality management, and discloses an LED fluorescent material quality management system based on emission spectrum data, and the system comprises a trajectory analysis unit, a spectral analysis unit, a high temperature maintenance unit and a quality management unit. A spectral response track is generated through parameters such as a spectral intrinsic purity factor and a thermal evolution incidence matrix, the spectral drift and thermal quenching process is reduced, the spectral analysis unit carries out analysis based on the spectral response track to obtain a dynamic spectral response vector representing dynamic thermal stability, and meanwhile, the high-temperature performance maintenance index generated by the high-temperature maintenance unit is used for improving the dynamic thermal stability. The performance maintenance capability of the LED fluorescent material at a high temperature can be reflected, the instruction of the LED fluorescent material can be effectively judged through the quality management identifier generated by the quality management unit, the quality misjudgment is effectively avoided, and the quality management accuracy is improved.

The invention provides a rare earth metal halide glass scintillator material with thermal quenching resistance and a preparation method and application thereof, and belongs to the technical field of glass scintillator materials. The preparation method comprises the following steps: uniformly mixing boron oxide, aluminum oxide, lithium carbonate, terbium fluoride, sodium fluoride and gadolinium fluoride, carrying out high-temperature melting, cooling, and finally carrying out annealing, polishing and heat treatment to obtain the rare earth metal halide glass scintillator material with thermal quenching resistance. According to the preparation method disclosed by the invention, the defect structure of the glass is regulated and controlled by separating out the nanocrystalline, and the glass scintillator material which is resistant to thermal quenching, large in area, super-stable and excellent in performance is prepared, so that the glass scintillator material can serve for a long time in a high-temperature environment, and the application range of the glass scintillator material is expanded.

The invention belongs to the field of solid luminescent materials, and discloses a multifunctional composite luminescent material capable of realizing bimodal fluorescence temperature sensing and multicolor anti-counterfeiting and a preparation method thereof, the chemical formula of the multifunctional composite luminescent material is Ln < 3 + >: A2M3O12 / g-C3N4, the combination of Ln and A is one of the following two: (1) Ln = Er, and A = Yb; (2) Ln = Er / Yb, and A = Sc; and M is one of W or Mo. Under the excitation of 980 nm, green up-conversion luminescence of transition emission from 2H11 / 2 to 4I15 / 2 and from 4S3 / 2 to 4I15 / 2 shows a thermal enhancement phenomenon, and the composite luminescent material can be applied to ratio type temperature sensing; under 365 nm excitation, 465 nm blue down-conversion luminescence shows a thermal quenching phenomenon, and the material is suitable for fluorescence intensity type temperature sensing; in addition, by means of switching of a 980 nm excitation light source and a 365 nm excitation light source, the light emitting color can be reversibly converted between green and blue, and therefore dynamic fluorescent anti-counterfeiting is achieved.

The application discloses an up-conversion luminescent material with reverse thermal quenching and thermal quenching, belongs to the field of rare earth luminescent materials, and has a chemical formula of NaEr 0.695 F4:Yb 0.2 / Gd 0.1 / Eu 0.005 The material morphology is a micron-level hexagonal disc, and the NaEr 0.695 F4:Yb 0.2 / Gd 0.1 / Eu 0.005 The up-conversion micro-particle is used as a dual-function up-conversion luminescent temperature sensor, and can be used for a sensitized sensor and a thermal quenching sensor, and can also be used for non-contact optical temperature measurement or high-sensitivity optical temperature measurement under extreme temperature conditions. Temperature detection is realized based on thermal coupling energy levels, the distance between two emission peaks is large, and data processing errors are greatly reduced; the up-conversion luminescent intensity of the energy level is enhanced with the increase of temperature, which is called reverse thermal quenching, and the temperature sensing performance is better. The application further discloses a preparation method of the material, and the method is simple to operate, the material has good crystal phase, uniform phase, high yield and stable performance, and has good dual-function temperature response effect.

The invention provides a Mn < 4 + >-Tb < 3 + > co-doped KZn (PO3) 3 luminescent material and a preparation method and application thereof, and belongs to the technical field of luminescent materials. KZn (PO3) 3 is used as a matrix, Mn < 4 + > and Tb < 3 + > are co-doped, an efficient energy transfer channel is established between the Mn < 4 + > and the Tb < 3 + >, in the ultraviolet excitation process, energy absorbed by the Mn < 4 + > can be partially transferred to the Tb < 3 + >, and therefore characteristic red light of the Mn < 4 + > and characteristic green light of the Tb < 3 + > are excited at the same time. In the stress action process, carriers released by a matrix are captured by Mn < 4 + > and Tb < 3 + > under the assistance of a piezoelectric field and compositely emit light, and composite light emitting has strain discoloration performance. Meanwhile, co-doping effectively stabilizes a luminescence center and significantly inhibits a thermal quenching effect. The material integrates multiple modes of multi-color luminescence under ultraviolet excitation, long afterglow, dynamic luminescence under stress triggering and the like, and a brand new material is provided for developing a new generation of optical sensing and multi-dimensional dynamic anti-counterfeiting technology.

The invention belongs to the technical field of inorganic halide materials, and particularly relates to Sb-doped CsCd5Cl11 all-inorganic halide as well as a preparation method and application thereof. The novel all-inorganic metal halide CsCd5Cl11 with a three-dimensional rigid structure is successfully synthesized, and the structure of the novel all-inorganic metal halide CsCd5Cl11 contains a distorted [CdCl6] < 4-> octahedron. In addition, by introducing Sb < 3 + > cations, the CsCd5Cl11: Sb < 3 + > shows a broadband orange photoluminescence characteristic in a temperature range of 260-440K, and has excellent thermal quenching resistance.

The invention relates to the technical field of atmospheric environment monitoring and analytical chemistry, and discloses an accurate measurement and conversion mechanism research method of an atmospheric active nitrogen oxide component, and the method comprises the following steps: constructing a pneumatic virtual wall suspension flow field through coaxial flow, focusing gas to be measured into filamentous flow which is not in contact with a pipe wall, and eliminating adsorption loss; non-contact transient temperature scanning is implemented by using focused infrared radiation, and different components are sequentially thermally dissociated at characteristic temperatures according to the activation energy difference; after the reaction, forcibly mixing high-temperature gas and low-temperature sheath gas by utilizing flow field driving to realize active thermal quenching, and freezing a chemical state; the total nitrogen dioxide concentration is detected by adopting a phase moving cavity enhanced absorption spectrum; and finally, establishing a concentration-temperature response relationship, and obtaining the independent concentration of each component through differential processing and inversion calculation. According to the invention, the problems of serious tube wall adsorption effect, thermal conversion retardation and multi-component spectrum overlapping interference in traditional measurement are solved, and high temporal-spatial resolution and high-sensitivity accurate measurement of atmospheric active nitrogen oxides is realized.

The invention relates to the technical field of luminescent materials, and particularly provides ultra-wide blue-violet light excited green fluorescent powder as well as a preparation method and application thereof. The general chemical formula of the fluorescent powder is Lu2SrHfAl4O12: xEu < 2 + >, wherein the value range of x is 0.01 to 0.05. The fluorescent powder is synthesized in a reducing atmosphere by adopting a high-temperature solid-phase reaction method, and has a garnet type cubic crystal structure. The material has strong excitation capability in the wave band of 345-365 nm, the emission peak is near 520 nm, the full width at half maximum is about 82 nm, the internal quantum efficiency reaches 30.18%, and the external quantum efficiency is 17.73%. Under the condition of high temperature of 423K, the fluorescent powder can still maintain the initial luminous intensity of 80% or above, and shows excellent thermal stability and thermal quenching resistance. The fluorescent powder is suitable for a white light LED device excited by a near ultraviolet LED chip, can effectively improve the color rendering index, and is suitable for the fields of full-spectrum illumination and high-end display.

The invention discloses a laser white light source module capable of improving light color consistency, which comprises a laser diode, a laser collimating lens, a reflecting prism, a micro lens array, a focusing lens, a fluorescent powder sheet, a radiator, a radiating copper pipe group and a reflector structure, and is characterized in that the laser diode is fixed in a radiating copper pipe, and the radiating copper pipe is fixed in the radiator; the micro lens array, the focusing lens and the fluorescent powder sheet are sequentially and oppositely arranged in the reflector structure. The collimating lens and the reflecting prism are adopted to collimate laser beams and reduce the distance between the laser beams, and meanwhile, the micro lens array and the focusing lens are utilized to enable the laser beams to uniformly irradiate the surface of the fluorescent powder sheet with the micro structure, so that fluorescent powder is excited to generate uniform yellow light, and the yellow light is mixed with blue light to form uniform white light. The light color consistency of the light source is improved, and the problem of fluorescent powder thermal quenching caused by overhigh local energy on the surface of the fluorescent powder sheet can be solved.