149results about How to "Low phonon energy" patented technology

The invention relates to synthesis of germanium sulphide glasses and optical devices formed therefrom. In a chemical vapour deposition process, germanium tetrachloride is reacted with hydrogen sulphide at temperatures in the range 450-700° C. to form germanium sulphide. Lower temperatures within this range of 450-550° C. directly produce a glass, whereas higher temperatures within the range of 600-700° C. produce a crystalline powder which can then be reduced to a glass by subsequent melting and annealing. The reaction is preferably carried out at atmospheric pressure or slightly higher. Thin films and bulk glasses suitable for optical waveguides can be formed directly in one processing step as can powders and microspheres. The materials synthesised are of a high purity with low oxide impurities and only trace levels of transition metal ions.

The invention discloses a lead-free ferroelectric upconversion fluorescent ceramic material which is prepared by doping a rare-earth element with an oxide matrix with a perovskite structure. The material is characterized in that a chemical formula of the material is Bi0.5-x-yNa0.5YbxPryTiO3, wherein x is not less than 0.005 and not more than 0.04 and y is not less than 0.0003 and not more than 0.0015. The invention further discloses a preparation method and an application of the material. Compared with the prior art, the material has the advantages that the upconversion fluorescent radiation property in a ferroelectric substance can be realized by adding the trivalent rare-earth element Pr<3+> into (Bi0.5Na0.5)TiO3, so that the material becomes a multifunctional material with a controllable fluorescent electric field, and electricity leakage of the (Bi0.5Na0.5)TiO3 ceramic also can be improved.

The invention discloses an Er<3+>/Yb<3+> co-doped yttrium lithium fluoride monocrystal and a preparation method thereof. The yttrium lithium fluoride monocrystal is a rare earth ion Er<3+>/Yb<3+> co-doped monocrystal; the molecular formula is LiY(1-x-y)ErxYbyF4, wherein x is greater than or equal to 0.008 and less than or equal to 0.085, and y is greater than or equal to 0.002 and less than or equal to 0.170; the segregation coefficients of Yb<3+> and Er<3+> in the yttrium lithium fluoride are about 1, and efficient intermediate infrared laser of 2.7 microns can be output; and the yttrium lithium fluoride monocrystal has high transmittance of intermediate infrared laser, has better thermal, mechanical and chemical stabilities than those of glass state materials and has the characteristics of low phonon energy, high optical transmittance of wavebands with width of 300-5500nm, less color center forming amount, low thermal lens effect and the like, thereby being more easily processed and more suitably used in laser devices. In the preparation method disclosed by the invention, a sealing crucible falling technology is used, so that the operation is simple; the raw material is fluorated at high temperature in a sealed water-free and oxygen-free environment, so that the crystal is isolated from air and water vapor during the growth; and therefore, the high-quality Er<3+>/Yb<3+> co-doped LiYF4 monocrystal containing little OH<-> ion and oxide is obtained.

The invention provides a method for preparing an upconversion nanometer material taking NaLuF4 as a base material, which includes the following steps: Step I, adding rare-earth chloride solution into ethylene diamine tetraacetic acid solution, uniformly stirring, and adding the solution into sodium fluoride water solution, stirring to obtain a solution A; Step II, adding the solution A to a reaction still for hydrothermal reaction, and cooling to obtain a solution B; and Step III, heating the solution B, and obtaining the end product, the upconversion nanometer material taking the NaLuF4 as the base material, after precipitation separation, washing and stoving. According to the invention, hydrochloric acid serves as solvent of rare earth oxide, ethylene diamine tetraacetic acid serves as surface appearance control agent, and the upconversion nanometer material taking the NaLuF4 as the base material can be prepared after the hydrothermal reaction; the prepared upconversion nanometer material taking the NaLuF4 as the base material has the characteristics of controllable surface appearance, excellent dispersity, excellent up-conversion luminescence performance, and the like; and the method has simple equipment, is easy to operate, facilitates mass production and popularization, and has better application prospects.

The invention discloses a temperature sensor device based on a chalcogenide glass material and a construction method thereof. The temperature sensor device includes a broadband light source, a first spectrum analyzer and a long-period fiber grating made of a chalcogenide glass material. The two ends of the long-period fiber grating are respectively connected with the broadband light source and thefirst spectrum analyzer. The long-period fiber grating is obtained in a way that a single-mode chalcogenide glass fiber is subjected to fused tapering to form a tapered chalcogenide fiber and the tapered chalcogenide fiber is written in the long-period fiber grating via femtosecond laser pulses. The temperature sense device based on the chalcogenide glass material has a temperature sensitivity of2.97186 nm/DEG C, which is significantly higher than the temperature sensitivity of 0.04-0.1 nm/DEG C of the traditional quartz long-period fiber grating sensor, is more suitable for high-sensitivitytemperature transmission, and has a wider application prospect in the field of high sensitivity sensing.

A Tm3+/Yb3+ codoped oxyfluorotellurate glass with high up-conversion power to strong blue light is prepared by fusion method. It contains TeO2, B2O3, PbF2, WO3, ZnF2, Tm2O3 and Yb2O3 proportionally. Its advantages are high transparency, excellent physical and chemical properties, and strong blue light converting power.

High-efficiency mid-infrared laser crystal is used for outputting mid-infrared laser with the wave band ranging from 2.7 micrometers to 3 micrometers. The molecular formula of the crystal is Cr2xEr3yRe3zY3(1-y-z)Sc2(1-x)Ga3O12, wherein the Er is the abbreviation for Er3+, the Re is the abbreviation for Re3+, the Y is the abbreviation of Y3+, the Cr is the abbreviation for Cr3+, the Re3+ is Eu3+ or Tb3+, both the Re3+ and the Er3+ substitute Y3+ ions in 3Sc2Ga3O12 host crystal, the substitution concentration of the Er3+ ranges from 5at% to 30at%, namely the y ranges from 0.05 to 0.3, the substitution concentration of the Re3+ ranges from 0.1at% to 5at%, namely, the z ranges from 0.001 to 0.05, and the substitution concentration of the Cr3+ ranges from 0.1at% to 5at%, namely, the x ranges from 0.001 to 0.05. ions of the Re3+(Re=Eu, Tb) have an energy level structure close to ions of the Er3+, the evaporation rate of particles with the energy level of 4I13/2 can be increased by the aid of resonance energy transfer among the ions of the Re3+ and the ions of the Er3+, the life time of the energy level of laser with the wave band ranging from 2.7 micrometers to 3 micrometers can be shortened to a certain degree, accordingly, output efficiency and power of laser of the crystal can be effectively enhanced, and the high-efficiency mid-infrared laser crystal has important application in the fields of bio-medical treatment, optical parameter oscillation, electro-optical countermeasure and the like.

The invention discloses chalcohalide glass and a preparation method thereof. The chemical formula of the chalcohalide glass is (1-x-y)Ga2S(3-x)Sb2S(3-y)CsA, wherein A is Cl, Br or I, x is not less than 0.1 and not greater than 0.5, and y is not less than 0.20 and not greater than 0.60. The preparation method comprises the following steps: (1) preparing a glass mixture by taking elemental gallium, elemental stibonium, elemental sulfur and a compound CsA as raw materials; (2) placing the glass mixture in a quartz ampoule, keeping the temperature of 850-900 DEG C for 12-24 hours, smelting, taking out and quenching the glass mixture to form glass; (3) controlling the formed glass at 220-250 DEG C for 4-6 hours for annealing, and finally cooling the glass to room temperature at the velocity of 0.1-0.4 DEG C per minute. The chalcohalide glass has excellent light transmission in a range of 0.6-12 [mu]m, low cost and environmental-friendliness, and is hopeful of having the application in the field of transmitting lights from the wave band of visible light to long wave infrared light band of 12 [mu]m.

The invention discloses luminescent glass and microcrystalline glass which are used for a white light-emitting diode (LED) and a preparation method for the luminescent glass and the microcrystalline glass. The luminous efficiency of rear earth ions can be improved by doping a certain amount of fluoride AF2 (A is Mg, Ca, Sr or Ba) into rear earth-doped strontium oxide-titanium oxide-silicon oxide (SrO-TiO2-SiO2) system glass, wherein the rare earth ions can be introduced in the form of oxide or fluoride. The luminescent glass is prepared by a high-temperature melting method, and is crystallized by a proper hot treating system to obtain the system microcrystalline glass. The luminescent glass and the microcrystalline glass are high in luminescent performance and stable in physical and chemical performance, can be mainly used in white LED devices for solving the problems of low color stability, high aging possibility of fluorescent powder and packing resin and the like of the conventional white LED, and can also be used in other related fields of lighting, displaying, light sources, detection and the like.

The invention discloses a thulium-doped sodium yttrium fluoride laser crystal and a preparation method thereof. Tm<3+> rare earth ions are doped into a NaYF4 crystal to generate a monocrystal of which the chemical formula is NaY(1-alpha)TmalphaF4. The lithium yttrium fluoride monocrystal has the advantages of high solubility for Tm<3+> ions and favorable thermal, mechanical and chemical stability. The rare earth ions doped in the monocrystal have high luminescence efficiency; and by adopting a water-free oxygen-free sealed crucible descending process and carrying out high-temperature fluoridation treatment on the raw material, the preparation method can be used for preparing the high-quality crystal which is almost free of hydroxide ions and oxides. Under the excitation of an 800nm-wavelength LD, the crystal has strong 1.8 mu m fluorescence emission; and the obtained crystal has long fluorescence lifetime in the 1.8 mu m wave range, and thus, can be used as a middle-infrared laser crystal in a laser unit.

The invention relates to transparent glass with the characteristic of emitting intermediate infrared light with a wavelength of 3.5 [mu]m and a preparation method thereof. A glass substrate of the transparent glass comprise the following chemical components: 25.5InF<3>-15ZnF<2>-18BaF<2>-11.5GaF<3>-8SrF<2>-12PbF<2>-5LiF-2LaF<3>-2YF<3>-1ErF<3> and 25.5InF<3>-15ZnF<2>-18BaF<2>-11.5GaF<3>-8SrF<2>-12PbF<2>-5LiF-5ErF<3>, wherein the sum of the molar percentages of all the compounds is 100%. The prepared glass has the characteristics of high transmittance, good thermal stability, low phonon energy and high fluorescence quenching concentration. Compared with the prior art, strong fluorescence with a wavelength of 3.5 [mu]m can be obtained under 635-nm laser diode pumping, and the transparent glasshas the potential of serving as a gain medium of a 3.5-micron fiber laser; and due to the fact that the preparation process of the transparent glass is simple, batch production can be achieved, and the transparent glass can be widely applied to the field of mid-infrared laser.

The invention discloses a crystal material, which is characterized in that the chemical formula of the crystal material is CaNdxEryLa(1-x-y)Ga3O7, wherein x is greater than or equal to 0.01 and less than or equal to 0.05, and y is greater than or equal to 0.1 and less than or equal to 0.3; the crystal material belongs to a tetragonal system and a space group shown in the description; the crystal material is formed into a laminated electronegative skeleton structure formed by a GaO4 tetrahedron, and Nd<3+>, Er<3+>, Ca2<+> and La<3+> are distributed among layers and have an unordered crystal structure. An Nd<+> ion is doped in Er<+3> activated CaLaGa3O7 crystal to greatly enhance the adsorption efficiency of the crystal for pump light, the efficient laser output of the -2.7mu m waveband of LD pumping is realized, the fluorescence emission of the crystal in an intermediate infrared waveband is enhanced, the service life and the particle number of 4I13/2 are greatly decreased, a self-final state bottleneck effect is inhibited, high gain is kept by laser media in an oscillation process, and the slope efficiency of the laser output is improved.

The invention provides an upconversion NaYF4:Yb3+/Er3+@YOF core shell micrometer crystal material and a preparation method of the same, and relates to a method of heterogeneous core shell compositionmicrometer crystal, for solving the technical problem that a dye sensitization solar cell prepared by the prior art is low in the photoelectric conversion efficiency. The upconversion NaYF4:Yb3+/Er3+@YOF core shell micrometer crystal material is particles taking double doped Beta-NaYF4 of Yb3+ and Er3+ as the core, and taking fluorine yttrium oxide as the shell. The preparation method of the upconversion NaYF4:Yb3+/Er3+@YOF core shell micrometer crystal material includes the steps: preparing Beta-NaYF4:Yb3+/Er3 by means of a hydrothermal method, and drying the Beta-NaYF4:Yb3+/Er3 to obtain powder; and putting the powder into an alumina crucible for sintering to obtain the upconversion NaYF4:Yb3+/Er3+@YOF core shell micrometer crystal material. The photoelectric conversion efficiency of thedye sensitization cell prepared by means of the upconversion NaYF4:Yb3+/Er3+@YOF core shell micrometer crystal material is 8.39%. The upconversion NaYF4:Yb3+/Er3+@YOF core shell micrometer crystal material can be applied to the solar cell field.

The invention discloses a rare earth doped nanoprobe, preparation and a new coronavirus detection probe. The rare earth doped nanoprobe is a praseodymium doped sodium lutetium fluoride coated sodium yttrium fluoride with a core-shell structure, wherein the formula of the rare earth doped nanoprobe is NaLu1-xF4:Prx@NaYF4, wherein the NaLu1-xF4 is a matrix, and the doping ion is praseodymium; the colon refers to praseodymium doping, wherein x is the doping molar ratio of rare earth ions, and the range of x is 0.0005-0.05; the NaYF4 is a shell layer, and the symbol @ refers to that NaYF4 coats the surface of NaLu1-xF4:Prx. According to the invention, rare earth fluoride is used as a matrix and different rare earth ions are doped, so that the praseodymium-doped lutetium sodium fluoride nanometer probe with high performance is synthesized; the doping of lutetium and the doping proportion further reduce phonon energy of the matrix and improve the efficiency of energy conversion, and the doping of praseodymium can utilize the luminescence of praseodymium at about 610 nm to facilitate the detection, so that the rare earth nanoprobe with strong photochemical property stability and long luminescence service life is prepared.

The invention discloses a barium fluoride up-conversion transparent ceramic and a preparation method thereof, and belongs to the technical field of optically functional materials. The existing alumina up-conversion transparent ceramic has low up-conversion luminous efficiency and is prepared difficultly. The barium fluoride up-conversion transparent ceramic utilizes barium fluoride transparent ceramic as a matrix and comprises: by mole, 60 to 89% of barium fluoride, 10 to 25% of ytterbium fluoride, and 1 to 15% of one or more of fluorides of erbium, holmium, neodymium, thulium and promethium. The preparation method comprises the following steps of blending raw material nanometer powder according to the mole percentage, wherein barium fluoride powder has particle sizes of 20 to 80nm and rare earth fluoride powder has particle sizes of 10 to 90nm, pressing the blended raw material nanometer powder into a biscuit, pre-sintering the biscuit at a temperature of 500 to 800 DEG C for 0.5 to 5 hours, carrying out vacuum sintering of the pre-sintered biscuit under the conditions of pressure of 50 to 500MPa, a vacuum degree of 10<-2> to 10<-3>Pa, a heating rate of 1 to 20 DEG C/min, a sintering temperature of 600 to 1200 DEG C and sintering time of 0.5 to 5 hours, and cooling to a room temperature at a rate of 1 to 20 DEG C/min to obtain the barium fluoride up-conversion transparent ceramic.

The invention belongs to the field of crystal growth, particularly relates to a preparation method for holmium-doped yttrium barium fluoride crystals, and aims at solving the problem that existing holmium-doped yttrium barium fluoride crystals are difficult to grow. The preparation method comprises the steps of 1 crystal growth raw material preparing; 2 crystal growing; 3 annealing; 4 postprocessing. According to the preparation method for the holmium-doped yttrium barium fluoride crystals, the holmium-doped yttrium barium fluoride crystals are prepared by adopting the mode of combining a slow cooling method with a Bridgman-Stockbarger method, therefore, the problem that in the crystal growing process, the crystals are cracked due to the fact that the temperature gradient is too large can be effectively avoided, and the large-size and high-quality complete crystals can be obtained; in addition, seed crystals are not needed, the equipment is simple, the whole growing process is performed under the high-vacuum condition, and the problems that the crystals are difficult to grow and bubbles are wrapped in the crystals due to the fact that the flowing property of yttrium barium fluoride melt is poor are solved.

The invention discloses a rare earth doped barium calcium fluoborate laser crystal, a preparation method, and a method for realizing laser. Barium calcium fluoborate BaCaBO3 F is used as a matrix to be doped with rare earth ions, and meanwhile, the rare earth doped barium calcium fluoborate laser crystal is prepared by doping an equal amount of Li<+> or Na<+>. The chemical formula of the laser crystal is BaCa<1-2x>RE<x>A<x>BO<3>F, RE=Pr or Dy or Sm, A=Li or Na, and x ranges from 0.001 to 0.05. Rare earth ions Pr<3+> or Dy<3+> or Sm<3+> are added to replace lattice sites occupied by Ca in the matrix, and the same amount of Li<+> or Na<+> is doped to meet charge balance, so that the laser crystal materials BaCa<1-2x>Pr<x>Li<x>BO<3>F, BaCa<1-2x>Pr<x>Na<x>BO<3>F,BaCa<1-2x>Dy<x>Li<x>BO<3>F, BaCa<1-2x>Dy<x>Na<x>BO<3>F, BaCa<1-2x>Sm<x>Li<x>BO<3>F and BaCa<1-2x>Sm<x>Na<x>BO<3>F are formed. The method has the beneficial effects that oxyfluoride BaCaBO3F is taken as a visible laser crystal matrix, the energy level of rare earth ions is utilized, a new transition channel is adopted, and GaN-based blue light LD pumping is adopted to obtain visible waveband laser; and the prepared rare earth doped barium calcium fluoborate laser crystal combines the advantages of fluoride and oxide, and has the advantages of low phonon energy and stable mechanical and chemical properties.

The invention belongs to the technical field of an optical material, and relates to an infrared optical transmission material, an infrared luminescent material and a preparation method thereof, in particular to novel dysprosium-containing chalcogenide glass and a preparation method thereof. The dysprosium-containing chalcogenide glass comprises the following components in mol content by the total weight of GeGaS-CdS glass: 20 to 24 mol percent of Ge, 10 to 12 mol percent of Ga, 52 to 67 mol percent of S, and 1 to 18 mol percent of CdS, wherein a range of doping amount of a rare-earth element dysprosium is between 1,000 and 50,000ppm. The preparation method mainly comprises the steps of pretreatment of a quartz tube, purification treatment of a glass batch, vacuum seal and glass melting. Compared with the prior chalcogenide glass, an initial reactant of the dysprosium-containing chalcogenide glass has no corrosion to quartz, introduction amount of rare-earth elements is quite high, glass forming property is excellent, and thermodynamic performance is good. The preparation method for the novel dysprosium-doped chalcogenide glass has the advantages of simple technology, no corrosion, easy operation, short processing period and high efficiency, and is suitable for large-scale production; and the dysprosium-containing chalcogenide glass can be used as an infrared laser material and applied to the high-tech fields such as national defense, communication and the like.

The invention discloses an Ho<3+>/Yb<3+> double doped Alpha-NaYF4 laser crystal and a preparation method thereof. The preparation method is characterized in that KF is taken as a fluxing agent, and is added in the raw materials of NaF, YF3, HoF3 and YbF3 to generate the Ho<3+>/Yb<3+> double doped Alpha-NaYF4 laser crystal. The preparation method has the advantages that because a certain quantity of KF (of which the melting point is 858 DEG C) is added in the initial raw materials as the fluxing agent, the fluxing agent KF reduces the melting point of the Alpha-NaYF4 laser crystal, and changes the phase equilibrium relation in the melt; when primary crystallization is begun in the melt, only solid phase of the Alpha-NaYF4 and other liquid phase are separated; the Alpha-NaYF4 laser crystal with a relatively large size is obtained eventually along with nucleus formation and growth of the Alpha-NaYF4 crystal; the NaYF4 monocrystal is high in solvability to rare earth, and has good thermal, mechanical and chemical stability; rare earth ions doped in the monocrystal are high in luminous efficiency.

The invention relates to a rare-earth-doped chalcogenide (halogen) thin film material. Two types of rare earth ions, namely trivalent rare earth ion thulium Tm 3 plus and dysprosium Dy 3 plus, are co-doped in a germanium-gallium-based chalcogenide (halogen) thin film; the thin film material is amorphous; the optical active thin film material with near-infrared multi-band emission characteristic is formed; the chemical compositin of the thin film material is basically kept consistent with a glass block body target material, and a glass base target material comprises 72mol% of GeS2, 18mol% of Ga2S3 and 10mol% of CdI2, and the doping concentration of each of the Tm 3 plus and the Dy 3 plus is 1.0 plus or minus 0.2% by weight and 0.4 plus or minus 0.1% by weight of the weight of the glass base target material respectively. High-bandwidth emission of a thin film sample can be realized under pumping of a laser diode in the wavelength of 808nm. The amorphous chalcogenide (halogen) thin film material obtained by the preparation method disclosed by the invention has the advantages of uniform components and easiness in control; and the preparation parameters of the material are easy to adjust.

The invention belongs to the technical field of conversion luminescence materials and relates to a silver-containing nanocrystal blue light enhanced tellurite glass and a preparation method of the tellurite glass. The glass comprises glass phase components, externally doped rear earth oxides and silver salts and is prepared by virtue of melting and thermal treatment, wherein the glass phase components include the following substances in percentages by mol: 60-80% of TeO2, 5-10% of WO3, 0-5% of La2O3, 0-5% of GeO2, 5-10% of ZnO, and 5-20% of ZnF2+ZnCl2; the externally doped rear earth oxides include the following ingredients in percentages by mol based on the molar contents of the above glass phase components: 0.02-0.1% of Tm2O3 and 0.1-1% of Yb2O3; and the silver salts include the following ingredients in percentages by mass based on the mass contents of the above glass phase components: 0.3-0.7% of AgCl+AgF. The silver-containing nanocrystal blue light enhanced tellurite glass disclosed by the invention can be widely applied to the manufacturing of a blue light emission laser device.

Methods for synthesizing a phosphor which is capable of upconversion fluorescence. One exemplary method includes forming a rare earth hydroxide and exposing the rare earth hydroxide to a fluorine source to produce a rare earth fluoride. Another exemplary method includes fluorinating a rare earth hydroxide without use of F₂ or HF to produce a rare earth fluoride and purifying the rare earth fluoride.

The invention relates to a green-light upconversion lanthanium titanate-based paramagnetic glass material and a preparation method thereof. The green-light upconversion lanthanium titanate-based paramagnetic glass material is prepared from the following compositions through the following method: (1) introducing a magnetic composition Gd2O3 into a lanthanium titanate-base material; and (2) mixing powders of various oxides forming the green-light upconversion lanthanium titanate-based paramagnetic glass material, performing melting and solidification in an air-suspending container-free furnace, so as to prepare the green-light upconversion lanthanium titanate-based paramagnetic glass material. The green-light upconversion lanthanium titanate-based paramagnetic glass material also possesses good mechanical strength, thermal performance and relatively low phonon energy, and possesses wide application prospect in fields of short-wavelength laser devices, optical waveguide, information storage and the like.