163 results about "Phonon energy" patented technology

The invention discloses Li3YCl6 glass ceramics doped with rare earth ions. The Li3YCl6 glass ceramics is prepared from 87.8-94 mol% of SiO2, 5.5-10 mol% of Li3YCl6 and 0.5-3 mol% of LnCl3, wherein LnCl3 is at least one of YbCl3, ErCl3, TmCl3 and HoCl3. The Li3YCl6 glass ceramics has the advantages of being transparent, resistant to air slake, good in mechanical performance, high in blue and purple light transmittance, low in phonon energy, high in up-conversion efficiency, capable of greatly improving efficiency of an up-conversion laser device, simple in preparation method and low in production cost.

A tellurite-based glass composition for use in EDFAs exhibits higher phonon energy without sacrificing optical, thermal or chemical durability properties. The introduction of boron oxide (B2O3) into the Er3+-doped tellurite glasses increases the phonon energy from typically 785 cm−1 up to 1335 cm−1. The inclusion of additional glass components such as Al2O3 has been shown to enhance the thermal stability and particularly the chemical durability of the boro-tellurite glasses. Er:Yb codoping of the glass does further enhance its gain characteristics.

The invention discloses a rare earth doped glass frequency conversion luminous material and a preparation method thereof. The luminous material is formed by fluoride glass ceramics containing rare earth ions and silver nanoparticles. The preparation method comprises the steps of firstly preparing glass containing rare earth ions, secondly preparing the glass into the glass ceramics containing fluoride crystals through the heat treatment technology, and thirdly soaking the glass ceramics in a mixed salt melt containing silver nitrate to undergo ion exchange, thus obtaining the rare earth doped frequency conversion luminous material jointly enhanced by the silver nanoparticles and fluoride microcrystals. The obtained luminous material has the beneficial effects that the luminous material has good optical property and thermal stability; through irradiation of exciting light, by utilizing the local field enhancement effect of the silver nanoparticles, the rare earth ions in a low phonon energy environment created by the fluoride microcrystals achieve high frequency conversion luminous efficiency which can be maximally enhanced by 30 times, thus effectively making up for the problem of low rare earth ion doped glass frequency conversion luminous efficiency.

The invention discloses a rare earth ion doped down-conversion luminescence transparent microcrystalline glass, which is obtained by doping rare earth ion in an oxyfluoride microcrystalline glass substrate with the molar concentration of the rare earth ion to be 1-40% and the volume percent of the fluoride microcrystal in the glass matrix to be 1-50%. The down-conversion luminescence transparent microcrystalline glass of the invention has the advantages of low phonon energy of the fluoride, excellent machining characteristic and chemical stability of the oxide glass and quantum efficiency which is more than one; the glass slowly ages under the condition of outdoor long-term illumination and can also be machined into transparent plate shape or even ultrathin plate shape, therefore, the glass is one of the best selections which can be used in solar cells, and has wide application prospect.

A practical technique for inducing and controlling the fusion of nuclei within a solid lattice. A reactor includes a loading source to provide the light nuclei which are to be fused, a lattice which can absorb the light nuclei, a source of phonon energy, and a control mechanism to start and stop stimulation of phonon energy and / or the loading of reactants. The lattice transmits phonon energy sufficient to affect electron-nucleus collapse. By controlling the stimulation of phonon energy and controlling the loading of light nuclei into the lattice, energy released by the fusion reactions is allowed to dissipate before it builds to the point that it causes destruction of the reaction lattice.

A system and method for permanently writing diffraction gratings in low phonon energy glass waveguides are shown. Ultrashort light pulses are generated and made to form two beams synchronously superimposed in the waveguide, therefore forming an interference pattern corresponding to the desired grating. The light pulses are focussed so that the light intensity in the waveguide exceeds a filamentation threshold. The exposure of the waveguide to these light pulses is controlled temporally and spatially in order to limit detrimental thermal effects induced by the high-intensity pulses in the glass medium of the waveguide.

The invention provides a nano glass ceramic up-conversion luminescent material and a preparation method thereof. The up-conversion luminescent material is a nano glass ceramic material which takes TiO2, La2O3 and ZrO2 as base components. The nano glass ceramic up-conversion luminescent material is heavy-metal oxide microcrystalline glass which has high mechanical strength, good temperature stability and good anti-corrosion performance; the nano glass ceramic up-conversion luminescent material has the advantages of low phonon energy, combination of high luminous efficiency of a crystal, easiness for glass preparation and the like, and is a novel up-conversion luminescent material. According to the preparation method of the nano glass ceramic up-conversion luminescent material, under the condition of no use of any glass forming agent, an air suspension container-free condensation technology is adopted to prepare novel heavy metal oxide block glass which cannot be easily obtained under normal conditions.

The invention provides an up-conversion light emitting material and a preparation method thereof, wherein the up-conversion light emitting material is composed of a kernel, an intermediate layer and a shell; the kernel is a gold nano-particle layer; the intermediate layer is a silicon dioxide layer; and the shell is an Yb<3+> and Re<3+> doped yttrium oxide layer. Compared with the up-conversion light emitting material with a kernel structure in the prior art, the up-conversion light emitting material disclosed by the invention is characterized in that a nano-gold kernel is used as a plasma element; the double-doped yttrium oxide layer is used as the up-conversion light emitting layer; firstly, the up-conversion light emitting efficiency is increased by utilizing the surface enhancement effect of gold nano-particles; secondly, a yttrium oxide substrate has better transmissivity at visible light and infrared bands; the phonon energy is lower and is 430-550 cm<-1>; high-concentration doping can be carried out; and the up-conversion light emitting efficiency is also favorably increased; finally, chemical property of yttrium oxide is steady; and the up-conversion light emitting material is simpler for preparation and lower in cost.

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 relates to the technical field of intermediate infrared rare earth doped luminescent glass application, and aims at solving the technical problem of providing a method for preparing oxygen fluorine chlorine tellurate glass with intermediate infrared fluorescence output at 4 mu m. The glass is good in glass forming property, high in infrared light transmission rate, good in luminescence property and beneficial to output of fluorescence and laser of 4 mu m. The oxygen fluorine chlorine tellurate glass prepared by using a fusion method is tellurate glass which contains zinc fluoride and zinc chloride, and due to the appropriate amount of contains zinc fluoride and zinc chloride, the hydroxyl content and the phonon energy in the system are greatly reduced, so that the forming capability of the glass is effectively improved, the doping amount of rare earth ions is increased, and the fluorescence service lives of the rare earth ions are prolonged. By adopting the doping amount of the external doping rare earth ions, namely, Ho<3+> and Yb<3+>, the pumping efficiency of 980nm is greatly improved, and tests show that the oxygen fluorine chlorine tellurate glass has remarkable fluorescence output at 4 mu m.

This inventive infrared ray transmitting glass (gallate glass) is composed of (by mol percentages): Ga2O3:5-40, MO / MCO3:30-70,MF2 / MCl2:0.1-25,Me2O3:0-24. During the smelting, introduced are: dry air, CC14, GeC14, C12, SOC12, one or more of these kinds, to effectively lower the harmful content of hydroxyl. The glass has its cut-off wavelength longer than 6um, and has advantages of: low glass phonon energy, better glass formation property, excellent mechanical property, high optical quality, low hydroxyl content, suitable for making plane sensor window, scout plane window, automobile window, head cover of missile, optical fiber of infrared ray laser, substrate glass of optical fiber amplifier.

The invention discloses a preparation method of rare earth ion doped tungsten oxygen fluoride silicate up-converted luminescent glass. The preparation method comprises the steps of: firstly, uniformly mixing silicon dioxide, germanium dioxide, aluminum oxide, tungsten oxide, calcium fluoride, titanium dioxide and rare earth oxide in a mortar; and then preparing the Er<3+>-Yb<3+> rare earth ions doped tungsten oxygen fluoride silicate up-converted luminescent glass by adopting a high-temperature melting annealing method. The method disclosed by the invention is simple in preparation method, low in raw material cost and simple in required device without a special device; and the overall preparation process is carried out in air atmosphere. According to the invention, tungsten oxide is introduced into an oxygen fluoride silicate glass substrate for the first time, and the further solution of the problems that the oxygen fluoride silicate glass is poor in chemical stability and mechanical strength after tungsten oxide is introduced is facilitated, so that the glass product has the advantages of low phonon energy of fluoride and good crystallization stability of oxide, thereby obtaining strong up-converted red and green light output visible to naked eyes.

The invention discloses a glass ceramics whispering gallery mode resonant cavity capable of outputting single mode high-performance laser and a preparation method thereof, and belongs to the field ofoptical devices. The method comprises the following steps: firstly mixing raw materials for preparing the glass resonant cavity with rear earth active ion raw materials sufficiently, then carrying outmelting and rod winding to obtain active fiberglass; drawing the active fiberglass to tapered fiber by melt extraction, and truncating the tapered fiber in the middle to obtain single taper fibers; melting the thin ends of the single taper fibers through a heating source, and forming a microsphere cavity by utilizing the action of surface tension; carrying out heat treatment or laser-induced treatment on the microsphere cavity to obtain a glass ceramics microsphere cavity, and carrying out coupling with the tapered fiber and packaging to obtain the glass ceramics whispering gallery mode resonant cavity. According to the invention, the preparation process is simple, the prepared glass ceramics microsphere cavity has relatively high quality factor, the influence on active ion gain propertyof amorphous state and relatively high phonon energy of glass is improved by the separation of microcrystal, and laser output with lower threshold value and higher slope efficiency can be realized.

The invention discloses an Er<3+> / Pr<3+> co-doped yttrium lithium fluoride monocrystal and a preparation method thereof. The yttrium lithium fluoride monocrystal is a rare earth ion Er<3+> / Pr<3+> co-doped monocrystal; and the molecular formula is LiY(1-x-y)ErxPryF4, wherein x is greater than or equal to 0.010 and less than or equal to 0.085, and y is greater than or equal to 0.0001 and less than or equal to 0.008. The yttrium lithium fluoride monocrystal has the advantages of high emission efficiency of fluorescence of 2.7 microns and high transmittance in intermediate infrared ray, 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+> / Pr<3+> co-doped LiYF4 monocrystal containing little OH<-> ion and oxide is obtained.

The invention belongs to the technical field of luminescence and display, relating to a red luminous material in a novel rare earth phosphor luminous material for converting a purple light emitting diode (LED) to a white LED. The structure formula of the red luminous material is M[3-a-b-c]NSi2O8:Ra.Sb.Tc, when M is metal element Ba, N is metal element Mg, R is transition metal element Mn, S is rare earth element Eu and T is rare earth element Tb, MnCl2.4H2O is an activating agent and a fluxing agent in the reaction, thus reducing the reaction temperature, shortening the reaction time, lowering phonon energy in substrate lattice and improving the luminous efficiency. The preparation method comprises the following steps: weighting the materials with the structure formula by weight percent, evenly grinding, placing and calcining the ground material in a high-temperature furnace, cooling, porphyrizing, calcining at high temperature again, and porphyrizing again after cooling, thus obtaining the product. The red luminous material is mixed with a silicate rare earth luminous material capable of emitting blue light and green light in proportion to be coated on the core of the purple LED so as to emit white light.

The invention discloses a Pr / Yb doped yttrium lithium fluoride monocrystal used for modulation of a solar spectrum and a preparation method thereof. The LiYF4 monocrystal has the characteristics of low phonon energy, high broadband optical transmission, good physicochemical stability and the like. Pr<3+> and Yb<3+> ions are simultaneously doped into the LiYF4 monocrystal, and the concentration of the doped Yb<3+> ions is greater than the concentration of the doped Pr<3+> ions; under excitation of 480-nm light, energy of the Pr<3+> ions is transferred to the Yb<3+> ions so as to allow each Pr<3+> ion to absorb a photon with an ultraviolet wavelength of 480 nm and each Yb<3+> ion to release two near-infrared photons with a wavelength of 980 nm; and thus, modulation of a solar spectrum is effectively realized, high luminous efficiency is obtained, and the Pr / Yb doped yttrium lithium fluoride monocrystal has excellent resistance to light irradiation, mechanical properties, thermal properties, physicochemical performance and optical transmission. The preparation method for the monocrystal is simple, and the prepared monocrystal has high purity and good quality.

Methods for synthesizing fibers having nanoparticles therein are provided, as well as preforms and fibers incorporating nanoparticles. The nanoparticles may include one or more rare earth ions selected based on fluorescence at eye-safer wavelengths, surrounded by a low-phonon energy host. Nanoparticles that are not doped with rare earth ions may also be included as a co-dopant to help increase solubility of nanoparticles doped with rare earth ions in the silica matrix. The nanoparticles may be incorporated into a preform, which is then drawn to form fiber. The fibers may beneficially be incorporated into lasers and amplifiers that operate at eye safer wavelengths. Lasers and amplifiers incorporating the fibers may also beneficially exhibit reduced Stimulated Brillouin Scattering.

The invention discloses a zirconium-oxide-based rare earth up-conversion luminescent film material and a preparation method of the material. A zirconium oxide film prepared by a sol-gel method is taken as a host material, and a high-efficiency up-conversion luminescent film material is obtained due to the co-doping of sensitizing agent and up-conversion luminescent center. The used host material is high in chemical stability, heat stability and optical transparency, wider in forbidden band width, and lower in phonon energy. The proportion among rare earth ions can be easily regulated and controlled by doping the solution, so that the up-conversion luminescent waveband can be conveniently adjusted. A precursor body sol is good in stability, and can be stored for a long time and repeatedly used when the material is prepared. Meanwhile, the obtained film material is easy to prepare, is easy to be combined with a device, and is good for the device application.

The invention discloses tellurium-based sulfur series infrared glass. The glass comprises the following components: 10 to 20 mole percent of In2Te6, 45 to 80 mole percent of GeTe 4 and 5 to 40 mole percent of AgX, wherein the total mole percentage of all components is 100 percent; X is Cl or Br or I; the transition temperature (Tg) of the glass is between 170 and 200 DEG C; the thermal stability temperature (delta T) of the glass is between 100 and 120 DEG C; the thickness of the glass is no more than 1.4 millimeters; and a cut-off edge through which an infrared band can pass is up to 25 mu m. The glass has an appropriate transition temperature, and high thermal stability, reduces the base frequency molecular vibration of the glass due to the adoption of a heaviest element in a sulfur group, namely, tellurium and reduces the phonon energy of the glass. Simultaneously, the thickness of the glass is controlled to be no more than 1.4 millimeters so that the influence of multi-phonon absorption is reduced, the cut-off edge, through which the infrared band can pass, of the tellurium-based sulfur series infrared glass is enhanced and can reach 25 mu m, substances with long far infrared wavelengths can be absorbed and spectrum detection space is expanded. The glass preparation method has the advantages of simple process, high glass forming capability, no corrosion, easy operation, short processing period and high efficiency.

The present invention relates to a solid state laser device with a solid state gain medium between two resonator end mirrors (3, 5) and a GaN-based pump laser (1) arranged to optically pump the solid state gain medium. The solid state gain medium is a Pr3+-doped crystalline or polycrystalline host material (4) which has a cubic crystalline structure and highest phonon energies of ≦600 cm and provides a band gap of ≧5.5 eV. The proposed solid state laser can be designed to emit at several visible wavelengths with the emitted power showing a reduced dependence on the temperature of the GaN-based pump laser (1).

The invention relates to high-luminous-intensity terbium-activated silicate glass and a preparation method thereof. The invention belongs to the field of luminescent materials. According to the invention, B2O3 with high phonon energy is added into a terbium-activated silicate glass formula; the mixture is well mixed; and preparation is carried out through high-temperature fusing and an annealing treatment. B2O3 takes 2-20% of a total weight of the glass formula. The glass and the method are advantaged in that: with he prepared terbium-activated silicate glass, the luminous intensity of Tb<3+> is effectively improved. The luminescent glass can be used in fields such as displaying, illumination and photoelectric devices.

The invention provides a transparent rare earth ion-doped hexagonal sodium yttrium fluoride oxyfluoride glass-ceramics and a preparation method thereof. The glass is prepared from the following compositions: 50-70mol% of SiO2, 3-12mol% of Al2O3, 15-20mol% of Na2O, 5-12mol% of NaF and 5-12mol% of YF3, and a sum of the compositions is 100 percent; and the glass also is prepared from ErF3 which accounts for 0.1-1mol% of the sum of the compositions, wherein the molar content ratio of SiO2 to Al2O3 is larger than 6.5. Compared with silicate glass, the hexagonal sodium yttrium fluoride oxyfluoride glass-ceramics has lower phonon energy (as low as 230cm<-1>), lowers the multi-phonon nonradiative relaxation rate of rare earth ions, and thus enabling the up-conversion luminescence efficiency of the rare earth ions in the glass-ceramics to be obviously improved.

The invention discloses a Ho<3+> / Pr<3+> codoping lithium yttrium fluoride monocrystal and a preparation method thereof. The lithium yttrium fluoride monocrystal is a rare-earth iron Ho<3+> / Pr<3+> codoping monocrystal; the molecular formula of the lithium yttrium fluoride monocrystal is LiY(1-x-y)HoxPryF4, wherein x is more than and equal to 0.004 or less than and equal to 0.08, and y is more than and equal to 0.0002 or less than and equal to 0.01. The lithium yttrium fluoride monocrystal disclosed by the invention has the characteristics of high efficiency of 2.9 mu m fluorescence emission, high intermediate-infrared transmittance, more excellent thermotic, mechanical and chemical stability compared with those of a glass-state material, low phonon energy, high optical transmissibility at a 300-5500 nanometer broadband, small color center forming amount, low thermal lens effect, and the like, and is easier to process and more suitable for a laser device. The preparation method disclosed by the invention adopts a sealing crucible descent method technology, is easy to operate, carries out high-temperature fluorination treatment on a raw material and obtains the high-quality Ho<3+> / Pr<3+> codoping LiYF4 monocrystal almost without -OH ions or oxides by insulating the monocrystal from air and vapors in the growing process by adopting a water-insulated oxygen-insulated sealing environment.

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 novel garnet-structure multiphase fluorescent material and a preparation method thereof. The novel garnet-structure multiphase fluorescent material has a chemical formula of AaM1bM2cM3dO12-delta N delta: xRe, yR. zT. The novel garnet-structure multiphase fluorescent material has a multiphase structure comprising a rare earth ion-activated garnet structure fluorescent solid solution phase and inert metal particles such as one or more of Au, Ag, Pt and Pd, and the fluorescent phase contains nitrogen replacing a part of oxygen and halogen ions replacing a part of oxygen Through low-phonon energy inert metal particles in the multiphase structure, luminescence performances of the garnet-structure fluorescent solid solution phase are obviously improved. The multiphase fluorescent material can produce a luminescence spectrum with one or more peaks after UV-blue and green light excitation, can emit lights from blue lights to orange red lights and can be used in LED device manufacture.

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.