158 results about "Germanate" patented technology

A light emitting device can include a substrate, electrodes provided on the substrate, a light emitting diode configured to emit light, the light emitting diode being provided on one of the electrodes, phosphors configured to change a wavelength of the light, and an electrically conductive device configured to connect the light emitting diode with another of the plurality of electrodes. The phosphors can substantially cove at least a portion of the light emitting diode. The phosphor may include aluminate type compounds, lead and/or copper doped silicates, lead and/or copper doped antimonates, lead and/or copper doped germanates, lead and/or copper doped germanate-silicates, lead and/or copper doped phosphates, or any combination thereof.

This invention relates to luminescent materials for ultraviolet light or visible light excitation containing lead and/or copper doped chemical compounds. The luminescent material is composed of one or more than one compounds of aluminate type, silicate type, antimonate type, germanate/or germanate-silicate type, and/or phosphate type. Accordingly, the present invention is a good possibility to substitute earth alkaline ions by lead and copper for a shifting of the emission bands to longer or shorter wave length, respectively. Luminescent compounds containing copper and/or lead with improved luminescent properties and also with improved stability against water, humidity as well as other polar solvents are provided. The present invention is to provide lead and/or copper doped luminescent compounds, which has high color temperature range about 2,000K to 8,000K or 10,000K and CRI over 90.

A phosphor for converting ultraviolet light or blue light emitted from a light emitting element into a visible white radiation having a high level of color rendering properties, containing a light emitting component prepared from a solid system of an alkaline earth metal antimonate and a system derived from the solid system and exhibiting intrinsic photoemission, such as a fluoroantimonate, a light emitting component prepared from a manganese(IV)-activated antimonate, a titanate, silicate-germanate, and an aluminate, a light emitting component prepared from a europium-activated silicate-germanate or from a system containing a sensitizer selected from a group consisting of europium (II) and manganese (II) as a secondary activator and having an orange color or a dark red color in the spectrum range over 600 nm, or a light emitting component composed of a mixture of eight or less light emitting components having different emission bands and brought to a state of continuous emission of about 380 to 780 nm exhibiting a color temperature of about 10,000 to 6,500 K and a color temperature of about 3,000 to 2,000 K by virtue of the superposition of the light emitting bands.

A heavy metal oxide glass selected from germanate, tellurite and bismuth oxide glasses provides a host for highly efficient Thulium doped 2 μm oxide glass and fiber lasers. The concentration of Thulium ions is high enough that energy transferred by the phenomenon of cross-relaxation will enhance laser emission at 2 μm and suppress emission at 1.5 μm so that 2 μm emission is dominant.

The invention discloses an alkaline earth metal germanate nanomaterial and a preparation method thereof and use of the nanomaterial as a cathode material of lithium ion batteries. The method comprises the following steps of: (1) mixing an aqueous solution of alkaline earth metal salt and germanium source compound GeO2 to obtain a liquid mixture; (2) allowing reaction of the liquid mixture obtained in the step (1) to take place in a polytetrafluoroethylene-lined high-pressure reaction kettle after heating, and cooling after the reaction is completed to obtain the alkaline earth metal germanate nanomaterial. The method is simple, has abundant and easily-available raw materials, is suitable for large-scale production and has a high level of practicability. The obtained alkaline earth metal germanate is a nanomaterial, has a high actual capacity, can be directly used as a cathode material of lithium ion batteries, solves the problem that the germanium-based material as lithium ion battery cathode material has a poor cycling property and takes a violent change of volume during charging/discharging process, and can be directly used as the cathode material of lithium ion batteries.

This invention pertains to a composite of AlON and a germanate glass, and to a process for bonding AlON to the glass. The composite includes AlON and glass bonded together and having transmission in the visible and mid-infrared wavelength region. The process includes the step of heating them together above the softening temperature of the glass, the composite having excellent, i.e., typically in excess of about 60%, transmission in the 0.4-5 wavelength region.

The invention discloses 2-micron luminous rare-earth ion-doped germanate laser glass and a preparation method thereof. The mol percentage composition of the glass is as follows: 60 to 65 percent of GeO2, 15 to 20 percent of BaF2, 2 to 13 percent of Ga2O3, and 2 to 13 percent of Re2O3ReF3; wherein, Re is the rare-earth elements of La, Yb, Tm and Ho. The rare-earth ion doping mode of the glass is: single doping of Tm, double doping of Yb and Tm, double doping of Yb and Ho, double doping of Tm and Ho, or three doping of Yb, Tm and Ho. Rare-earth ions are introduced in the form of rare earth oxides or rare earth fluorides and can all obtain the glass with stability and excellent luminous performance. Test result shows that the germanate glass in the invention has higher transmission rate and wider transmission range. A fluorescence spectrum test shows that the germanate laser glass of the invention can obtain excellent fluorescence emitting approaching to 2-micron. The laser glass of the invention is also suitable for preparing 2-micron optical fiber perform cores.

The invention provides a germanate glass cladding/semiconductor fiber core composite material optical fiber. According to the germanate glass cladding/semiconductor fiber core composite material optical fiber, multi-component germanate glass is adopted as an optical fiber cladding material, and Ge, InSb, GaSb, SnTe or GeTe semiconductors are adopted as an optical fiber core material, so that a 2-to-5 micron-light band low-loss composite material optical fiber can be formed, and the transmittance of the composite material optical fiber is greater than 75%. Medium-infrared band has been widely applied to fields such as atmospheric monitoring, laser radar, laser medical treatment and spectroscopy, and has become a hot research topic in recent years. When light is transmitted in the optical fiber, a transmission light field is mainly distributed in the fiber core of the optical fiber, while, a part of the light field exists in the cladding of the optical fiber, and therefore, low-loss light transmission requires high transmittance of the fiber core and the cladding for transmitted light. According to the germanate glass cladding/semiconductor fiber core composite material optical fiber of the invention, the category of the germanate glass cladding/semiconductor fiber core composite material optical fiber can be greatly enriched, and the performance of the semiconductor material in the medium-infrared band can be given to full play, and a foundation can be provided for the application of the composite material optical fiber to the medium-infrared band.

The invention discloses a method for raising near infrared light emitting thermal stability of Bi-doped glass. A melting method is employed, and 1-20mol% of rare earth ionic compounds are added in Bi-doped glass ingredients. The rare earth ions in the rare earth ionic compounds are La<3+>, Pr<3+>, Sm<3+>, Gd<3+>, Yb<3+>, Ce<3+>, Eu<3+>, Tb<3+>, Ho<3+>, Er<3+>, Dy<3+>, Lu<3+>, Nd<3+> or Tm<3+>. Bi-doped glass is oxide glass, chalcogenide glass or halide glass. The oxide glass is borates, silicates, germanates or phosphates and the like. The chalcogenide glass is sulfides or oxysulfides. The halide glass is fluorides, oxyfluorides and the like. Rare earth ions are added in Bi-doped glass ingredients as "stabilizing agents" of glass strucutures directly, and the near infrared light emitting thermal stability is raised greatly. The operation is simple, change of preparation conditions is not needed, and the method can be achieved under existing technology conditions. The method also can be used for solving the problem of light-emitting quenching during Bi-doped glass fibre drawing process.

The invention discloses a bismuth silicate-germanate mixed crystal and a preparation method thereof, belonging to the single crystal field. The molecular formula of the bismuth silicate-germanate mixed crystal is Bi4Si3-xGexO12. The preparation method comprises the following steps: using high-purity Bi2O3, SiO2 and GeO2 as raw materials to fully grind, presinter and obtain a polycrystalline material; and placing seed crystal at the bottom of a crucible in advance, placing the synthesized polycrystalline material in the crucible, and transferring the crucible to a crystal growing furnace while controlling the temperature to 1050-1150 DEG C, the temperature gradient of the solid-liquid interface to 20-50 DEG C/cm and the growth velocity to 0.2-0.5mm/h. The raw material components of the bismuth silicate-germanate mixed crystal provided by the invention are adjustable and are distributed evenly; the mixed crystal has the scintillation property of bismuth silicate and the scintillation property of bismuth germanate, the mixed crystal has large size; the preparation method adopts stable temperature field and simple processing equipment; and multicrystal can grow at the same time, the growth efficiency of the mixed crystal is high, the production cost is low and the mixed crystal is suitable for industrial production.

The invention belongs to the technical field of luminescent materials, and discloses a red germanate long-afterglow luminescent material and a preparation method thereof. The method comprises the steps: according to the stoichiometric ratio of the chemical composition of Mg[2-y-z]Ge[1-x]O[4]:xMn<4+>,yYb<3+>,zLn<3+>, (x=0.001-0.20, y=0.005-0.10, and z=0-0.10), weighing MgO, GeO2, MnO2, Yb2O3 and Ln2O3, grinding uniformly, then in an oxidizing or inert atmosphere, sintering at high temperature, and cooling to obtain the red germanate long-afterglow luminescent material. The long-afterglow luminescent material does not contain sulfur, and has the advantages of good physical and chemical stability, cheap and easily obtained raw materials, and low cost; at the same time, compared with an Eu<2+> activated broadband-emission red long-afterglow luminescent material, the long-afterglow luminescent material provided by the invention has purer luminescent color, and has the emitted light closer to standard red light.

The invention discloses a preparation method of germanium dioxide, and relates to the field of rare metal metallurgy. The preparation method sequentially includes the steps of chlorinating and distilling germanium ore, re-steaming the germanium ore, rectifying and purifying the germanium ore to obtain germanium tetrachloride, hydrolyzing the germanium tetrachloride to prepare germanium dioxide andhydrolysis supernatant, precipitating the hydrolysis supernatant to prepare magnesium germanate filter residues, and distilling the magnesium germanate filter residues to obtain the germanium tetrachloride for reutilization. The preparation method has the advantages of high recovery rate, low use cost, less residual liquid, energy conservation and environment protection.

The invention discloses orange red fluorescent powder for an LED (Light Emitting Diode), which is germanate fluorescent powder activated by trivalent samarium. The chemical expression of the fluorescent powder is (Ma-xSmx) GebOc, wherein the M is at least one of Li, Na, K, Mg, Ca, Sr, Ba and Zn; the a is more than 0 and less than or equal to 6; the b is more than or equal to 1 and less than or equal to 11; the c is more than or equal to 3 and less than or equal to 25; and the x is more than 0 and less than 0.3. The preparation method comprises the following steps of: uniformly grinding and mixing simple substances and compounds of M, Ge and Sm or the corresponding salts, then roasting at high temperature, and preparing the fluorescent powder after crushing, cleaning to eliminate impurities and baking. The fluorescent powder has the characteristics of wide excitation wavelength range, high efficiency, stability and the like, and has the advantages of simple preparation method, no pollution and low cost. The fluorescent powder can be used for a purple light or ultraviolet light LED chip to manufacture a white light LED.

The invention discloses red fluorescent powder used for an LED (light-emitting diode). The red fluorescent powder is europium activated germanate fluorescent powder, and the chemical formula thereof is (Ma-2xAxEux)GebOc, wherein, M is at least one of Sr, Ba and Zn; A is at least one of Li, Na, K and Rb; a is less than or equal to 3 and more than 0; b is less than or equal to 4 and more than or equal to 1; c is more than or equal to 3 and less than or equal to 9; and x is less than 0.5 and more than 0. The preparation method comprises the steps of sintering at high temperature, smashing, cleaning for removing impurities and drying after uniformly mixing and grinding simple substances, compounds or corresponding salts of M, Ge and Eu and compounds or corresponding salts of A. The fluorescent powder has the characteristics of wide excitation wavelength range, high efficiency and high stability, the preparation method is simple, no pollution is produced, and the cost is low. The fluorescent powder can be widely applied to purple, ultraviolet or blue LED chips for fabricating a white LED.

The invention belongs to the rare earth luminescent material field, particularly relating to a method for making novel red magnesium barium germanate fluorescent powder used for display. The composition of the obtained magnesium barium germanate fluorescent powder is Ba(2-x)MgGe2O7:Eu<3+>x, wherein x is more than 0 and less than 1. The method comprises the following steps that: analytically pure reaction raw materials of barium salt, magnesium salt, GeO2, activator and corresponding molten slat are weighed up according to stoichiometric ratio and are put into an agate mortar to carry out grinding; thus, the reaction raw materials are evenly mixed and reach to certain fineness; the ground raw materials are put into a corundum crucible to carry out molten salt reaction at the temperature of between 650 and 1,200 DEG C for 3 to 10 hours, thereby obtaining a melted product; and the product is dried after the molten slat are washed away through deionized water so as to obtain a needed product. The method is simple and easily realized and has excellent reproducibility.

The invention discloses Ce < 3 + > doped silicate scintillation glass as well as a preparation method and application thereof. The Ce < 3 + >-doped silicate scintillation glass comprises the followingcomponents: Li2O, MgO, Al2O3, SiO2 and Ce2O3, and the fluorescence emission efficiency of the Ce < 3 + >-doped silicate scintillation glass under the excitation of cathode rays is 4.65 times that ofbismuth germanate crystals. The main process of the preparation method is as follows: calcining precursor powder to generate a microcrystalline phase component in the precursor powder, melting, casting and annealing the powder to form amorphous glass, and carrying out crystallization heat treatment to precipitate the microcrystalline phase again and enhance the precipitation ratio, thereby greatlywidening the fluorescence emission spectrum of the scintillation glass and enhancing the fluorescence emission efficiency of the scintillation glass. The invention can be used for manufacturing a scintillation detector, and can also be used for thermal neutron detection when 6Li nuclide is introduced.

The invention provides a breathing ammonia gas sensor based on a polyaniline/semiconductor metal oxide nano composite film. The breathing ammonia gas sensor based on the polyaniline/semiconductor metal oxide nano composite film comprises a polyaniline/metal germanate nanocomposite film, wherein the polyaniline/metal germanate nanocomposite film is a film formed by doping polyaniline with metal germanate, or the polyaniline/metal germanate nanocomposite film comprises a metal germanate film and a polyaniline film attached to the metal germanate film. The breathing ammonia gas sensor based on the polyaniline/semiconductor metal oxide nano composite film has excellent performances such as selectivity, sensitivity, repeatability, stability and response recovery time, and shows good discrimination in actual measurement of human breathing ammonia gas concentration. The breathing ammonia gas sensor based on the polyaniline/semiconductor metal oxide nano composite film has simple preparation process, low cost and suitability for mass production.

The invention discloses nano-diamond/tellurium germanate glass microspheres with NV (Nitrogen Vacancy) center light emitting effect. A preparation method of the nano-diamond/tellurium germanate glassmicrospheres comprises steps as follows: (1), nano-diamond is subjected to high-temperature annealing treatment, and the NV center is obtained; (2), nano-diamond/tellurium germanate compound glass with the NV center is prepared from glass raw materials with a segmented melting method; (3), the compound glass is subjected to drawing, and glass fibers are obtained through drawing; (4), the glass fibers are subjected to thermal-insulation treatment, and the microspheres are obtained. The compound glass microspheres have quite small photo-induced refraction change and good optical stability, degree of eccentricity is smaller than 1%, and surface smoothness is smaller than 1 nm. The tellurium germinate glass doped with a denitration catalyst has low melting temperature and is high in transmittance when the light emitting range of the NV center is 500-800 nm, NV light intensity is high, the preparation method is simple, the cycle is short, besides, concentration of the doped nano-diamond ishigh, the glass microspheres are expected to be applied to NV center based quantum communication devices and various high-sensitivity physical quantity detectors, and integrated application of the glass microspheres can be possible.