8 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.

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.

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

The 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.

This invention discloses a high-temperature resistant rare-earth luminescent material and its preparation method, belonging to the technical field of rare-earth luminescent materials. Its general chemical formula is: Sr 1‑a‑b‑0.5x Mg a Al 2‑(x+y) Si x B y O4:Eu 2+ b Where 0.03≤a≤0.12, 0.02≤b≤0.08, 0.002≤x≤0.01, 0.002≤y≤0.008; its preparation adopts a sol-gel method combined with a segmented high-temperature calcination process, finally obtaining a high-temperature resistant rare-earth luminescent material. This invention utilizes Si 4+ and B 3+ Collaborative replacement of AI 3+ Lattice sites were introduced, and Sr vacancies were used for charge compensation in Eu. 2+ The surrounding structure is a high-rigidity, low-defect local structure, which solves the technical problem that existing rare earth luminescent materials are prone to thermal quenching and significant decrease in luminescence intensity at high temperatures, and significantly improves the thermal stability and high-temperature luminescence performance of the material.