83 results about "Thermal quenching" patented technology

The invention discloses a red up-conversion luminescent material, which belongs to the field of inorganic luminescent materials, the chemical formula of the material is NaEr < 0.65 > F4: Yb < 0.2 > / Gd < 0.1 > / Tm < 0.05 >, and up-conversion microparticles of the red up-conversion luminescent material are used as a bifunctional luminescent temperature sensor which can be used for a 293348 K low-temperature region sensitization sensor and a 348498 K high-temperature region thermal quenching sensor. After near-infrared light with the wavelength of 980 nm excites Yb < 3 + > ions, through efficient energy transfer between Er < 3 + > and Tm < 3 + >, different changes of near-infrared response type 654 nm and 808 nm red up-conversion luminescence characteristics can be used for non-contact optical temperature measurement under the extreme temperature condition. Temperature detection is realized based on thermal coupling energy levels of 4F9 / 2 to 4I15 / 2 and 3H4 to 3H6, and the distance between two emission peaks is large, so that the data processing error is greatly reduced; excitation light and emission light are located in an optical window of the biological tissue, and absorption and self-fluorescence of the biological tissue are greatly reduced. The preparation method is based on the green chemistry concept, takes water as a solvent and adopts a one-step hydrothermal method for synthesis, the preparation method is simple, the required temperature is low, the preparation process is easy to control, the material crystal phase is good, the phase is uniform, the yield is high, the material performance is stable, and the good temperature response effect is achieved.

The invention discloses a heat treatment process of a gear, which relates to the technical field of automobile gear heat treatment, and comprises the following steps: S1, blanking, S2, forging, S3, normalizing: preheating the gear in a preheating furnace by adopting a heating mode of combining infrared radiation and hot air circulation, S4, rough machining, S5, carburizing and quenching: carburizing and quenching, s6, induction heat quenching: performing induction heat quenching on an induction coil; S7, nitriding treatment; S8, low-temperature tempering; S9, finish machining; normalizing is combined with infrared radiation, hot air circulation preheating and induction heating, the effects of reducing energy consumption and machining cost and improving production efficiency are achieved, the forging force is reduced through isothermal forging, the energy consumption of equipment is greatly reduced, pulse type vacuum carburizing, high-pressure gas quenching and induction heat quenching are adopted to introduce a self-adaptive induction heating technology, and the energy consumption of equipment is greatly reduced. And a plasma nitriding technology and a composite nitriding technology are adopted, so that the surface hardness, wear resistance and fatigue strength are improved.

The invention provides a metal product quenching treatment process monitoring system and method, relates to the field of metal processing, and is characterized in that forged metal is obtained and subjected to preheating, quenching heating, quenching cooling, low-temperature tempering and cleaning rust-proof treatment to obtain finished metal. Wherein the quenching cooling needs to obtain a time queue of real-time metal temperature, real-time temperature of a cooling medium and real-time pressure of the cooling medium, and then input data is subjected to time sequence implicit coding, feature splicing and bidirectional interactive response representation so as to automatically recommend the flow velocity of the cooling medium, and the flow velocity is compared with the real-time flow velocity; therefore, a cooling medium flow rate adjusting instruction is generated. Therefore, the self-adaptability and the dynamic response capability of the system can be improved, the stability and consistency of the cooling effect are ensured, the cooling condition is timely responded and adjusted, and the problem of internal stress caused by inconsistent cooling speed is avoided.

The present invention discloses an abnormal thermal quenching near-infrared fluorescent ceramic and its preparation method and application. The chemical formula of the fluorescent ceramic is: (Lu 0.34+z Y 0.66‑y‑z Sc y )3(Sc 0.85‑x Al 0.15 Cr x )2Al3O 12 , 0.0005≤ x ≤0.02, x : y =1:(5‑10), x : z =1:(10‑20). y Sc 3+ The mole percentage of dodecahedral sites occupied, x Cr ions occupy the octahedron Sc 3+ The molar percentage of the lattice site. z is the Lu in the dodecahedron 3+ The molar percentage of the metering control. The ceramic green body is formed and sintered by using the acrylamide gel injection molding method combined with high temperature solid phase reaction. The luminescent center ion in the ceramic of the present invention presents a +3 valence state under the influence of the matrix microenvironment regulator (calcium carbonate, magnesium oxide and zirconium oxide, silicon dioxide, hafnium dioxide). The excitation peak of the ceramic is between 430nm-460nm, the half-height width is between 90nm-130nm, and the half-height width is between 150nm-160nm. o The luminous intensity at 200°C is 105%-165% of the room temperature. o The luminescence intensity at 400°C is 130%-200% of that at room temperature. When excited by a 430-460 nm excitation source, the emission wavelength ranges from 650 nm to 900 nm. The ceramic preparation process is simple, and the resulting anomalous thermally quenched near-infrared fluorescent ceramic is suitable for high-power near-infrared imaging and detection.

The present application discloses a white phosphorescent perovskite green fluorescent powder with high quantum efficiency and anti-thermal quenching of luminescence and a preparation method thereof. The chemical general formula is: M9Tb(PO4)7, where M is any one of Ca, Sr, Ba, and Mg; the fluorescent powder is synthesized by a high-temperature solid-phase method. The M9Tb(PO4)7 fluorescent powder exhibits the characteristics of anti-thermal quenching and high luminescence efficiency. At 200 °C, it can still maintain 125% of the emission intensity at room temperature (25 °C), effectively solving the problem of poor thermal stability existing in the prior art, and at the same time solving the problem of low luminescence efficiency caused by low doping concentration of Tb 3+ ​

The invention discloses high-thermal-conductivity fiber toughened fluorescent ceramic as well as a preparation method and application thereof, and aims to solve the problems of brittle fracture and thermal quenching of traditional fluorescent ceramic. According to the method, a pre-strain programmable 4D printing technology is adopted, and aluminum nitride (AlN) short fibers and carboxymethyl cellulose are self-assembled to form a natural concentric cylinder microstructure, so that the toughness and the mechanical property of the ceramic are enhanced. The strain distribution of the rubber film in a tensile state is simulated through finite element analysis, and the stress direction and the deformation control of a key area are optimized. Pre-strain is applied to the rubber film, and a fluorescent ceramic biscuit is printed on the surface of the rubber film; after the stress is released, the ceramic body spontaneously deforms into a hollow hemispherical structure. A rubber substrate is removed through high-temperature sintering, and the fluorescent ceramic with high mechanical strength and high thermal conductivity is obtained. The bending strength of the fiber-toughened fluorescent ceramic reaches 500-600 MPa, and the fracture toughness is improved to 9-11 MPa.m / , so that the fiber-toughened fluorescent ceramic is obviously superior to the traditional fluorescent ceramic.

The invention discloses an upconversion luminescent material with inverse thermal quenching and thermal quenching functions, and belongs to the field of rare earth luminescent materials, the chemical formula of the material is NaEr0. 695F4: Yb0.2 / Gd0.1 / Eu0.005, the material morphology is in a micron-scale hexagonal disc shape, and NaEr0. 695F4: Yb0.2 / Gd0.1 / Eu0.005 upconversion microparticles are used as a bifunctional upconversion luminescent temperature sensor, a sensitization sensor and a thermal quenching sensor, and can be used for detecting the temperature of a luminescent device. And the method can also be used for non-contact optical temperature measurement or high-sensitivity optical temperature measurement under an extreme temperature condition. The temperature detection is realized based on the thermal coupling energy level, the distance between two emission peaks is large, and the data processing error is greatly reduced; the up-conversion luminescence intensity of the energy level can be enhanced along with the rise of the temperature and is called inverse heat quenching, and the temperature sensing performance is better. The invention also discloses a preparation method of the material, the operation is simple, the material crystal phase is good, the phase is uniform, the yield is high, the material performance is stable, and the material has a good bifunctional temperature response effect.

The present invention relates to the field of nanomaterial synthesis, and discloses an upconversion luminescent material, a preparation method thereof, and an application thereof. The preparation method of the upconversion luminescent material comprises: (1) first stirring an ytterbium salt solution, an ammonium molybdate tetrahydrate solution, and a rare earth metal salt solution to obtain an intermediate I; the rare earth metal salt in the rare earth metal salt solution is selected from at least one of an erbium salt, a holmium salt, a praseodymium salt, and a europium salt; (2) subjecting the intermediate I to a hydrothermal reaction in a hydrothermal reactor to obtain an intermediate II; and (3) sequentially subjecting the intermediate II to a drying treatment and a calcination treatment to obtain the upconversion luminescent material. The upconversion luminescent material particles prepared by the method of the present invention have an average particle size of nanometer level, a good degree of crystallinity, and good reverse thermal quenching performance.

The present invention belongs to the technical field of synthesis of special functional inorganic fluorescent materials, and relates to a zero / negative thermal quenching near-infrared photoluminescent material, a preparation method thereof and an application. The material is obtained by a solvothermal reaction of 1,2-bis((2-methyl-1H-imidazol-1-yl)methyl)benzene obtained by reacting imidazole with α,α'-dichloro-o-xylene with cuprous iodide. The luminescence of this material is composed of metal-to-ligand charge transfer (MLCT) and cluster center triplet excited state ( 3 CC). This material (λ ex = 400 nm) exhibits a fluorescence thermal quenching effect at 295K - 385K and a fluorescence negative thermal quenching effect at 385K - 475K, and the fluorescence intensity is very stable in the high-temperature region. Its external quantum efficiency is as high as 22.07%, and it is a rare copper cluster that can emit light in the near-infrared region. It is a new type of high-efficiency OLED photoluminescent material with broad application prospects.

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.

The present invention belongs to the technical field of thermal expansion materials and discloses a high entropy negative thermal expansion luminescent material and a preparation method thereof. 0.196 Sc 0.196 In 0.196 Yb 0.196 Y 0.196 Er 0.02 )2Mo3O 12 Preparation method: Select Al source, Sc source, In source, Yb source, Y source, Er source and Mo source as raw materials, and prepare the target product (Al 0.196 Sc 0.196 In 0.196 Yb 0.196 Y 0.196 Er 0.02 )2Mo3O 12 The stoichiometric molar ratio of Al: Sc: In: Yb: Y: Er: Mo is 0.392: 0.392: 0.392: 0.392: 0.392: 0.04: 3, and the mixture is weighed and ground to mix evenly. The obtained mixed powder is directly sintered or sintered after tableting at a temperature of 1000-1100 ° C for 5-10 h, and then cooled to room temperature to obtain the target product (Al 0.196 Sc 0.196 In 0.196 Yb 0.196 Y 0.196 Er 0.02 )2Mo3O 12 The present invention proposes a molecular formula (Al 0.196 Sc 0.196 In 0.196 Yb 0.196 Y 0.196 Er 0.02 )2Mo3O 12 The high entropy negative thermal expansion luminescent material overcomes the thermal quenching characteristics of the luminescent material within a certain temperature range.

The present invention discloses the preparation and application of a cheap metal-organic fluorescent material for high-power LED lighting. The chemical formula of the complex is: [Cu₄I₄(bbimb)₂]ₙ, where the ligand bbimb is 1,2-bis((1H-benzoimidazol-1-yl)methyl)benzene, and its chemical formula is: C₂₂H₁₈N₄; the complex crystal belongs to the monoclinic system, the space group of the complex is P21 / c, and the crystal parameters of the complex are a = 11.3850(3) Å, b = 16.1962(3) Å, c = 26.8795(6) Å, α = 90°, β = 98.879(2)°, γ = 90°, Z = 4, V = 4897.02(19) ų. The present invention also provides a preparation method of the complex, which is simple, has good stability and high yield. The obtained complex shows orange fluorescence emission under the irradiation of a 365 nm ultraviolet lamp. And a large temperature range of zero thermal quenching occurs in the temperature range from 80 K to 500 K, and its fluorescence intensity hardly quenches with the increase of temperature, having broad application prospects in the field of ZTQ materials. Moreover, the optical properties of the LED assembled with the complex as the material are studied, and the LED shows good white light emission performance under high-throughput current.

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 discloses aluminosilicate green fluorescent powder with an abnormal thermal quenching effect, the chemical formula is Mg2-x-yMxAl4Si5O18: Tby, Tb < 3 + > is taken as a luminescence center, M is Ca < 2 + > or Sr < 2 + >, x / y is molar fraction, x is more than or equal to 0 and less than or equal to 0.5, and y is more than or equal to 0.045 and less than or equal to 0.135. The fluorescent powder emits green fluorescence with a peak value of 543 nm under the excitation of ultraviolet light. When the temperature rises, the luminescent property of the fluorescent powder shows an abnormal thermal quenching phenomenon, and when the temperature is 503K, the emission peak intensity at 543nm is 116% of that at 303K, and the fluorescent powder has excellent thermal stability.

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 invention discloses a preparation method and application of an up-conversion luminescent eutectic material, and belongs to the technical field of luminescent materials, the eutectic material is formed by mixing a matrix crystal phase and an up-conversion luminescent crystal phase, the matrix crystal phase is Al2O3, and the up-conversion luminescent crystal phase is gadolinium aluminate crystal Gd1-x-yAlO3: xYb < 3 + >, yRE < 3 + >, the two crystal phases have a synergistic effect, so that the thermal quenching phenomenon of the luminescent crystal phase is reduced, and high-sensitivity fluorescence temperature measurement is realized.

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 application discloses a highly efficient Eu anti-thermal quenching 3+ -doped borotellurite red phosphor and its preparation method. The Eu 3+ -doped borotellurite red phosphor has a chemical general formula of Ln 1‑x TeBO5: xEu 3+ , where the doping amount of Eu 3+ is 0 < x ≤ 0.9; Ln is Gd 3+ , La 3+ or Y 3+ ; any one of them; the Eu 3+ -doped borotellurite red phosphor emits red light with a wavelength of 550 - 750 nm under an excitation wavelength of 394 nm. The internal quantum efficiency of this phosphor reaches 95%, the external quantum efficiency reaches 40%, and the absorption efficiency is 34%; at 150 °C and 200 °C, the integrated emission intensity can maintain 99% and 98% of that at room temperature respectively, with almost no loss of emission intensity, approaching near-zero thermal quenching.

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 invention discloses a thermal barrier and temperature sensing dual-function integrated garnet ceramic material as well as a preparation method and application thereof. The material is composed of a high-entropy matrix of a garnet structure and luminescent ions, and the crystal structure is the same as that of Y3Al5O12. The thermal barrier properties such as thermal conductivity, sintering resistance, corrosion resistance and mechanical properties of the material are improved through the high-entropy design. And meanwhile, temperature sensing is realized by utilizing the change of different emission peaks generated by luminous ions along with the temperature, a non-thermal coupling energy level fluorescence intensity ratio technology of different luminous centers breaks through the limitation of the traditional thermal coupling energy level, the difference of thermal quenching behaviors is enhanced through energy transfer, and the temperature measurement upper limit and the sensitivity are cooperatively improved. In addition, the preparation method has the advantages of high sintering speed, controllable grain growth and the like, and is beneficial to low thermal conductivity and excellent mechanical properties. The material is of an integrated structure, the problems of interface stress concentration and the like are solved, the reliability and the service life of the hot end component are remarkably improved, and the material has wide application prospects in turbine blades and other hot end components.

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.