WO2009119668A1 - 透明蛍光体及びその製造方法 - Google Patents
透明蛍光体及びその製造方法 Download PDFInfo
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- WO2009119668A1 WO2009119668A1 PCT/JP2009/055957 JP2009055957W WO2009119668A1 WO 2009119668 A1 WO2009119668 A1 WO 2009119668A1 JP 2009055957 W JP2009055957 W JP 2009055957W WO 2009119668 A1 WO2009119668 A1 WO 2009119668A1
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- C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
- C09K11/00—Luminescent, e.g. electroluminescent, chemiluminescent materials
- C09K11/08—Luminescent, e.g. electroluminescent, chemiluminescent materials containing inorganic luminescent materials
- C09K11/77—Luminescent, e.g. electroluminescent, chemiluminescent materials containing inorganic luminescent materials containing rare earth metals
- C09K11/7706—Aluminates
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- C—CHEMISTRY; METALLURGY
- C03—GLASS; MINERAL OR SLAG WOOL
- C03B—MANUFACTURE, SHAPING, OR SUPPLEMENTARY PROCESSES
- C03B19/00—Other methods of shaping glass
- C03B19/06—Other methods of shaping glass by sintering, e.g. by cold isostatic pressing of powders and subsequent sintering, by hot pressing of powders, by sintering slurries or dispersions not undergoing a liquid phase reaction
- C03B19/063—Other methods of shaping glass by sintering, e.g. by cold isostatic pressing of powders and subsequent sintering, by hot pressing of powders, by sintering slurries or dispersions not undergoing a liquid phase reaction by hot-pressing powders
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- C—CHEMISTRY; METALLURGY
- C03—GLASS; MINERAL OR SLAG WOOL
- C03B—MANUFACTURE, SHAPING, OR SUPPLEMENTARY PROCESSES
- C03B19/00—Other methods of shaping glass
- C03B19/10—Forming beads
- C03B19/1005—Forming solid beads
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- C—CHEMISTRY; METALLURGY
- C03—GLASS; MINERAL OR SLAG WOOL
- C03C—CHEMICAL COMPOSITION OF GLASSES, GLAZES OR VITREOUS ENAMELS; SURFACE TREATMENT OF GLASS; SURFACE TREATMENT OF FIBRES OR FILAMENTS MADE FROM GLASS, MINERALS OR SLAGS; JOINING GLASS TO GLASS OR OTHER MATERIALS
- C03C12/00—Powdered glass; Bead compositions
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- C—CHEMISTRY; METALLURGY
- C03—GLASS; MINERAL OR SLAG WOOL
- C03C—CHEMICAL COMPOSITION OF GLASSES, GLAZES OR VITREOUS ENAMELS; SURFACE TREATMENT OF GLASS; SURFACE TREATMENT OF FIBRES OR FILAMENTS MADE FROM GLASS, MINERALS OR SLAGS; JOINING GLASS TO GLASS OR OTHER MATERIALS
- C03C3/00—Glass compositions
- C03C3/12—Silica-free oxide glass compositions
- C03C3/125—Silica-free oxide glass compositions containing aluminium as glass former
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- C—CHEMISTRY; METALLURGY
- C03—GLASS; MINERAL OR SLAG WOOL
- C03C—CHEMICAL COMPOSITION OF GLASSES, GLAZES OR VITREOUS ENAMELS; SURFACE TREATMENT OF GLASS; SURFACE TREATMENT OF FIBRES OR FILAMENTS MADE FROM GLASS, MINERALS OR SLAGS; JOINING GLASS TO GLASS OR OTHER MATERIALS
- C03C4/00—Compositions for glass with special properties
- C03C4/12—Compositions for glass with special properties for luminescent glass; for fluorescent glass
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- C09K11/00—Luminescent, e.g. electroluminescent, chemiluminescent materials
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- C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
- C09K11/00—Luminescent, e.g. electroluminescent, chemiluminescent materials
- C09K11/08—Luminescent, e.g. electroluminescent, chemiluminescent materials containing inorganic luminescent materials
- C09K11/77—Luminescent, e.g. electroluminescent, chemiluminescent materials containing inorganic luminescent materials containing rare earth metals
- C09K11/7766—Luminescent, e.g. electroluminescent, chemiluminescent materials containing inorganic luminescent materials containing rare earth metals containing two or more rare earth metals
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- C—CHEMISTRY; METALLURGY
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- C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
- C09K11/00—Luminescent, e.g. electroluminescent, chemiluminescent materials
- C09K11/08—Luminescent, e.g. electroluminescent, chemiluminescent materials containing inorganic luminescent materials
- C09K11/77—Luminescent, e.g. electroluminescent, chemiluminescent materials containing inorganic luminescent materials containing rare earth metals
- C09K11/7783—Luminescent, e.g. electroluminescent, chemiluminescent materials containing inorganic luminescent materials containing rare earth metals containing two or more rare earth metals one of which being europium
- C09K11/7792—Aluminates
Definitions
- the present invention relates to a transparent phosphor exhibiting white fluorescence and a method for producing the same.
- a white LED is prepared by sealing a powder phosphor that emits yellow fluorescence with blue excitation light with a transparent resin or low-melting glass and placing it on the excitation light source, and transmits yellow fluorescence and the transparent resin in the phosphor layer.
- White color is obtained by mixing blue light.
- the transparent resin or low-melting glass deteriorates or changes color or deforms due to heat and excitation light generated from the LED chip. There is a problem that the lifetime of the white LED is reduced.
- Patent Document 1 From such a current situation, it has been proposed to configure a white LED without using a resin and low melting point glass that are easily deteriorated (see Patent Document 1).
- the one described in Patent Document 1 obtains white light by causing the precipitated crystal constituting the crystallized glass to exhibit yellow fluorescence by excitation of blue light and transmitting blue light through the glass constituting the crystallized glass. It is what.
- the device described in Patent Document 1 has a problem that color rendering is poor because white light is composed of blue light and yellow light.
- a method for improving the poor color rendering a method of using two or more kinds of powder phosphors emitting red fluorescence, blue fluorescence and green fluorescence by ultraviolet excitation light in combination with an ultraviolet LED has been studied. Yes. JP 2007-31196 A
- an object of the present invention is to provide a transparent phosphor having a good color rendering property, which is configured without using a resin and a low melting point glass which are easily deteriorated, and a method for producing the same.
- A is Al, Ga, Ge, W, P, V, Zn, Si, B, Mg, Ca, Ba, Sr. And one or more elements of Sc and Sc), Ln (Ln is one or more elements of Y, Gd, La, Sm, Dy, Ho, Er, Yb and Lu), O and R as an activator
- R is one or more elements of Eu, Tb, Ce, Sm, Tm, Pr, Nd, Dy, Ho, Er, Yb, Mn, Ti, Fe, Cr and Pb, and is selected as Ln A resin that is easily deteriorated by being formed from two or more types of fluorescent phases having an amorphous phase mainly composed of an element other than (2) as a main phase and at least the type of R or the average valence of R being different.
- the present invention provides a transparent phosphor that exhibits white fluorescence upon incidence of excitation light, and has an amorphous phase mainly composed of A, Ln, O and R as an activator as a main phase, at least R It is characterized by being formed from two or more types of fluorescent phases having different types or different average valences of R.
- the present invention also includes a step of mixing two or more types of phosphor particles having the amorphous phase as a main phase, and 30% by volume or more of the constituent components of the two or more types of phosphor particles is a supercooled liquid. Pressing the mixture of the phosphor particles with the mixture of the phosphor particles at a temperature in a region, and further comprising the amorphous phase, And a step of mixing phosphor particles in which supercooled liquid regions overlap each other, and a step of pressurizing the mixture of phosphor particles at a temperature at which the supercooled liquid regions overlap each other. And a method for producing a transparent phosphor.
- a transparent phosphor that is configured without using a resin and low-melting glass that are easily deteriorated and has good color rendering properties and a method for producing the same.
- the transparent phosphor according to the present invention is formed from a fluorescent phase having an amorphous phase as a main phase, it is configured without using a resin and a low-melting glass, and is formed from two or more types of fluorescent phases. Therefore, the color rendering is good.
- the transparent phosphor according to the present invention is formed from a phosphor phase having an amorphous phase as a main phase, it is transparent and has good light transmittance, and is suitable as a phosphor used for a white LED. .
- a transparent phosphor is formed by pressurizing two or more kinds of phosphor particles having an amorphous phase as a main phase.
- the pressure process it has high fluidity in a temperature range far below the melting point, so it can be molded densely in that temperature range, and the transparent phosphor obtained thereby has the composition of the phosphor before molding. And the structure is maintained and the fluorescence characteristic before shaping
- the fluorescent phase has an amorphous phase mainly containing A, Ln, O, and R as a main phase. It may exist in the mass phase, and the major axis of this crystalline phase is preferably 200 nm or less. If the major axis of the crystalline phase present in the amorphous phase is 200 nm or less, the backscattering of light is suppressed, and transparency is not impaired.
- the major axis of the crystalline phase means the longest diameter when the crystalline phase is not a true sphere.
- the excitation light preferably has a wavelength of 490 nm or less.
- the transparent phosphor according to the present invention is formed into an arbitrary shape.
- A, Ln, O, and R are the main components, and other components other than A, Ln, O, and R are contained in a trace amount within a range that does not prevent non-crystallization of A, Ln, O, and R.
- A, Ln, O and R are 95% by weight or more.
- an amorphous phase as a main phase means that a small amount of a crystalline phase may be included.
- the amorphous phase is 70% by volume or more. The case where it consists only of a phase and the case where a crystalline phase exists in an amorphous phase are included.
- A may be any element selected from Al, Ga, Ge, W, P, V, Zn, Si, B, Mg, Ca, Ba, Sr and Sc.
- P, Si, Ga and Sr are preferably one or more elements.
- Ln may be any one or more of Y, Gd, La, Sm, Dy, Ho, Er, Yb, and Lu, but any one or more of Y, Gd, La, and Lu. It is preferable.
- R may be any element selected from Eu, Tb, Ce, Sm, Tm, Pr, Nd, Dy, Ho, Er, Yb, Mn, Ti, Fe, Cr, and Pb.
- Tb, Ce, Sm, Tm and Pr are preferred.
- the same combination is selected as A, Ln, and O, and even if the constituent ratios are the same, they are different. It is also possible to select a combination of different ones and make the composition ratios the same or different.
- A, Ln, and O are preferably selected so that the supercooled liquid regions overlap, but it is sufficient that 30% by volume or more overlap as described later.
- the method for producing a transparent phosphor according to the present invention includes a step of mixing two or more types of phosphor particles as described above, and a step of pressurizing the mixture of phosphor particles at a temperature in the supercooled liquid region.
- the molten particles are thus cooled and solidified to obtain spherical phosphor particles because the composition containing the main component is a composition outside the general vitrification range and easily crystallizes during solidification.
- the solid sample is melted by laser heating while rotating and floating in various ways without using a container such as a crucible that is likely to become the core of crystal crystallization, which is called the “no-vessel method”. This is because a bulk amorphous coagulum cannot be obtained unless a special production method for obtaining a small amorphous coagulum is obtained.
- the molten particles are spheroidized, the shape of the phosphor particles having the amorphous phase as a main phase is also spheroidized, the filling property of the phosphor particles during molding is improved, and the surface area is increased. Becomes smaller. Thereby, the denseness and transparency of the obtained transparent phosphor are improved, the shape imparting property is improved, and it is possible to emit light with high luminance.
- the molten particles composed of the constituent components of the phosphor particles are spheroidized in a state where the constituent components are kept in a molten state.
- Such molten particles can be obtained, for example, by a flame method, an atomizing method, and a spin disk method, and particularly preferably by a flame method.
- the flame method is a method in which particles each consisting of a constituent component are passed through a high temperature region having a temperature equal to or higher than the melting point.
- the prepared particles are put into a chemical flame or thermal plasma to be melted and melted. It is the method of obtaining the spherical particle of this.
- the atomization method is a method in which a raw material composed of constituent components is melted in a crucible or the like, and a melt is ejected from a discharge port opened in the crucible.
- the spin disk method is a method in which a melt is applied to a disk that rotates at high speed. It is the method of making it collide in the state which maintained the molten state.
- particles prepared by granulating powdery raw materials with a spray dryer, etc., and bulk materials obtained by sintering or melting and solidifying the raw materials are pulverized to use particles adjusted so as to obtain a desired particle size distribution. It is performed by putting the particles into a chemical flame or thermal plasma while suppressing the aggregation and melting them in the chemical flame or thermal plasma.
- a liquid precursor containing an element having a desired composition ratio such as a raw material colloidal liquid or an organometallic polymer can be used. It is performed by spraying in plasma and evaporating the solvent or dispersion medium in a chemical flame or thermal plasma and then melting it. It is also possible to provide a low-temperature heating zone between the nozzle and the chemical flame or thermal plasma, evaporate the solvent or dispersion medium in the liquid raw material, and then put it into the chemical flame or thermal plasma.
- a high temperature of 2400 ° C. or higher is obtained as a generation source of the chemical flame.
- a mixed gas of oxygen-acetylene or a mixed gas in which hydrogen is added to the chemical flame is easily obtained.
- oxygen, nitrogen, argon, carbon dioxide gas and mixed gas thereof, and water are used as a source of thermal plasma.
- an inductively coupled plasma apparatus is used, but water is used. It is preferred that
- the raw material may be any of powder, molded body, sintered body, and solidified body, or a combination of two or more of these. These raw materials are accommodated in a crucible having a melting point higher than the melting point thereof, for example, a crucible made of Mo, W, Ta, Ir, Pt or the like, or a Cu crucible cooled by water or the like and then melted.
- the melting method may be any method as long as the raw material can be heated to a temperature equal to or higher than its melting point, and for example, high frequency, plasma, laser, electron beam, light, or infrared can be used.
- the raw material is preferably melted in an atmosphere in which the raw material is not evaporated or decomposed and the crucible is not significantly consumed.
- An optimum atmosphere is selected depending on the raw material and the material of the crucible used, such as in the air, in an inert gas, or in a vacuum.
- spherical molten particles can be formed by ejecting the melt from the pores opened at the bottom of the crucible using gas pressure or the like.
- the spin disk method tilts the crucible, and in the same way as in the atomizing method, the melt collides with the rotating disk by, for example, jetting the melt from the pores opened at the bottom of the crucible using gas pressure etc. And spherical molten particles can be formed.
- These oxides are used as raw materials for the molten particles composed of the constituents of the phosphor particles, but any oxide may be used as long as it melts, and hydroxides, carbonates, etc. may be used. .
- the composition ratio of these raw materials is preferably in the range of forming a eutectic composition and in the range of ⁇ 10% by weight of the ratio.
- the composition of the spherical phosphor particles composed of Al, Y, O and Eu as an activator is within such a range, it is likely to become amorphous due to its relatively low melting point. This is because it becomes easy to obtain spherical phosphor particles having a good spherical shape.
- the spherical molten particles are cooled to form an amorphous phase.
- This cooling step can be performed, for example, by putting the spherical molten particles into a refrigerant and rapidly solidifying them.
- the molten particles containing the main component can be solidified in a non-equilibrium state by rapid cooling with a liquid refrigerant, and the spherical particles are solidified in a state where the atomic structure at the time of melting is substantially maintained.
- a refrigerant for example, helium gas, water, liquid nitrogen, liquid argon, or the like can be used.
- the spherical phosphor particles are solidified in a state in which the atomic structure at the time of melting is substantially maintained by rapid cooling with a liquid refrigerant, and spherical phosphor particles having a very small solidification shrinkage and a good spherical shape can be obtained.
- the phosphor particles are washed or heat-treated as necessary to remove impurities on the surface of the phosphor particles.
- the transparency of the transparent phosphor obtained by mixing and molding two or more kinds of the phosphor particles is further improved.
- the cleaning is performed according to the purpose with an organic solvent such as acetone or isopropyl alcohol, or various acids.
- phosphor particles having a composition that can be easily reduced may exhibit better fluorescence when heated in the presence of oxygen. Therefore, heat treatment in air or oxygen is performed at a temperature of 400 ° C. or higher. As a result, desired phosphor particles are produced.
- the mixing of two or more kinds of the phosphor particles whose main phase is an amorphous phase containing the main component can be performed by wet mixing using a ball mill, dry mixing using a V-type mixer or the like.
- the transparent phosphor is composed of two or more kinds of fluorescent phases having fluorescence spectra of different wavelengths, that is, two or more kinds of fluorescent phases having at least different R, and the phosphor particles to be mixed are: Depending on the fluorescence spectrum, it is appropriately selected so as to obtain a white color according to the purpose.
- the transparent phosphor having a desired shape can be obtained by the steps described below. Fill the molding raw material powder obtained by mixing two or more kinds of phosphor particles into a mold of the desired shape and heat it, raise the temperature to the supercooled liquid region of the phosphor particles, and maintain this temperature By pressurizing, it can be formed into a desired shape.
- the supercooled liquid region can be measured by analysis using a differential scanning calorimeter (DSC), and can be observed as a region showing endotherm.
- DSC differential scanning calorimeter
- the supercooled liquid region is a temperature region from the glass transition temperature to the crystallization temperature, and the solid having the supercooled liquid structure has before the start of crystallization. In this temperature range, the solid often exhibits viscous fluidity.
- the supercooled liquid region of the phosphor particles whose main phase is the amorphous phase containing the main component is in the temperature range of about 850 to 1050 ° C. with a width of about 50 to 100 ° C., and the supercooled liquid regions overlap each other.
- a molding raw material powder having particularly good moldability can be obtained.
- the two or more kinds of constituents of the phosphor particles are pressurized at a temperature at which 30% by volume or more is in the supercooled liquid region, the two or more kinds of phosphor particles mixed are sufficiently dense. Therefore, the denseness of the obtained transparent phosphor is not significantly deteriorated.
- the pressure at the time of molding depends on the desired shape and the pressure application speed, if it is 50 MPa or more, a dense transparent phosphor is easily obtained.
- Molding into a transparent phosphor can be performed in a vacuum, in a reducing gas or in an inert gas using a mold made of a high melting point metal such as graphite or Mo. It can also be carried out in the atmosphere using a good alloy mold.
- a transparent phosphor in which a crystalline phase is included in an amorphous phase of the phosphor phase is obtained by (a) melting or solidifying molten particles composed of the constituent components of the phosphor particles. The molten particles containing the main component are cooled and solidified to form the amorphous phase, and (b) a fluorescence having the amorphous phase as a main phase. After obtaining a transparent phosphor comprising a phase, it can be obtained by crystallizing at least a part of the amorphous phase by heating while adjusting the conditions.
- a transparent phosphor can be obtained by forming the mixture of phosphor particles into an arbitrary shape by pressurizing the mixture of phosphor particles at a temperature at which 30% by volume or more is in the supercooled liquid region.
- the proportion of the amorphous phase is 70% by volume or more, the viscous fluidity in the supercooled liquid region is not significantly impaired, and a dense transparent phosphor can be obtained.
- a transparent phosphor composed of a fluorescent phase having the amorphous phase as a main phase at least a part of the amorphous phase is crystallized by heating while adjusting the conditions.
- the spherical particles containing an amorphous phase are heated to precipitate a crystalline phase, or a part thereof is crystallized by improving crystallinity.
- the heating temperature at this time is 800 ° C. or more. It is preferable that the temperature is 1000 to 1700 ° C.
- the crystalline phase is In order to suppress coarsening and the inability to maintain a good spherical shape, a large heating rate and a short heating time are selected. Also, in the supercooled liquid region, crystal precipitation and growth may proceed slowly. Depending on the composition, the transparency of the transparent phosphor is not impaired by extending the holding time during molding. Crystals can be precipitated and grown to obtain a transparent phosphor having an amorphous phase including a crystalline phase as a main phase.
- the heating method of the transparent phosphor is not particularly limited as long as the transparent phosphor having an arbitrary shape can be heated at a temperature of 800 ° C. or higher and a melting point or lower, and resistance heating, high-frequency induction heating using a susceptor, Any method such as laser heating, electron beam heating, light heating, or infrared heating may be used.
- a transparent phosphor is accommodated in a crucible made of ceramics such as aluminum oxide or magnesium oxide, or a high melting point metal such as molybdenum, tantalum, platinum, or iridium, and the whole crucible is heated, transparent phosphor
- a method of heating while moving in a tubular furnace made of the same material as the crucible provided with a predetermined temperature gradient and a soaking area is adopted.
- the heat treatment of the spherical particles may be performed in any atmosphere, such as in the air, in an inert gas, in a reducing gas, in a hydrocarbon gas, or in a vacuum, but is limited by the crucible and heating method used. There is.
- Example 1 of the transparent phosphor according to the present invention will be described.
- phosphor particles 1 used as a raw material for forming raw material powder were obtained by the following method.
- raw materials ⁇ -Al 2 O 3 powder, Y 2 O 3 powder and Tb 4 O 7 powder were used.
- ⁇ -Al 2 O 3 powder, Y 2 O 3 powder and Tb 4 O 7 powder are mixed by a wet ball mill using water at a ratio of 65.3: 29.3: 5.4 from the former in a weight ratio and sprayed.
- the slurry obtained using a drier was granulated and dried to obtain granular particles having an average particle diameter of 11 ⁇ m.
- Granular particles obtained in parallel to the jet direction of the mixed gas are supplied into the flame formed by the combustion of the mixed gas of oxygen and acetylene, and melted and spheroidized in the flame.
- Phosphor particles 1 were obtained by allowing the molten particles to enter into flowing water and solidify.
- the obtained phosphor particles 1 had an average particle diameter of 8 ⁇ m.
- the spherical phosphor particles according to Example 1 were obtained by analyzing X-ray diffraction using Cu—K ⁇ rays, observation with a transmission electron microscope, and analysis of characteristic X-rays using a semiconductor X-ray detector installed in the transmission electron microscope. , O and Tb were found to be composed of an amorphous phase. Further, by analyzing the phosphor particles with a differential scanning calorimeter (DSC), endotherm is observed at 870 ° C. to 930 ° C., and this temperature region is a supercooled liquid region, that is, the phosphor in this temperature region. It was found that the particles have viscous flow processability.
- the phosphor particles 1 were washed with acetone and dried.
- the phosphor particles 2 used as the raw material of the forming raw material powder were obtained by the following method.
- phosphor particles 2 were obtained.
- the phosphor particles 2 had an average particle size of 8 ⁇ m.
- the phosphor particles 2 are obtained from Al, Y, O, and Eu by X-ray diffraction using Cu—K ⁇ rays, observation with a transmission electron microscope, and analysis of characteristic X-rays using a semiconductor X-ray detector installed in the transmission electron microscope.
- the phosphor particles were observed to absorb heat at 870 ° C. to 930 ° C., similarly to the phosphor particles 1, and this temperature region is the supercooled liquid region. That is, it was found that the phosphor particles have viscous flow processability in this temperature region.
- the phosphor particles 2 were washed with acetone, dried and heated in air at 800 ° C.
- phosphor particles 1 and 2 were dry-mixed by a V-type mixer so that the weight ratio of the former and the latter was 30:70.
- a forming raw material obtained by mixing phosphor particles 1 and 2 was filled into a cylindrical graphite mold having a circular cavity of ⁇ 12 mm in the longitudinal direction, and a graphite punch rod was inserted from above.
- Mo sheets having good surface smoothness were inserted into the upper and lower surfaces of the forming raw material.
- each graphite mold was installed in a hot press apparatus having a vacuum chamber in which a resistance heating type graphite heater was installed, and heated in vacuum.
- the temperature is once maintained at 800 ° C., the temperature in the mold is kept constant, and the temperature is raised again while applying a pressure of 100 MPa in a direction perpendicular to the circular surface. Molded by holding at 900 ° C. for 5 minutes in the cooling liquid region. Then, it cooled and took out the transparent fluorescent substance based on Example 1 shape
- the transparent phosphor according to Example 1 successfully transferred the surface of the inserted Mo sheet with good smoothness, and the surface had good smoothness and transparency.
- the fluorescence spectrum of the transparent phosphor according to Example 1 was measured. The fluorescence spectrum when excited at an excitation wavelength of 380 nm is shown in FIG.
- the transparent phosphor according to Example 1 was confirmed to have a plurality of fluorescence spectra in the visible region, and it was also confirmed to exhibit good white fluorescence when irradiated with black light having a peak wavelength of 370 nm.
- FIG. 1 It is a figure which shows the fluorescence spectrum by the excitation wavelength of 380 nm of the transparent fluorescent substance which concerns on Example 1.
- FIG. 1 shows the fluorescence spectrum by the excitation wavelength of 380 nm of the transparent fluorescent substance which concerns on Example 1.
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Abstract
Description
Claims (12)
- 励起光の入射によって白色蛍光を呈する透明蛍光体において、
A(AはAl、Ga、Ge、W、P、V、Zn、Si、B、Mg、Ca、Ba、Sr及びScのいずれか一以上の元素)、Ln(LnはY、Gd、La、Sm、Dy、Ho、Er、Yb及びLuのいずれか一以上の元素)、O及び付活剤としてのR(RはEu、Tb、Ce、Sm、Tm、Pr、Nd、Dy、Ho、Er、Yb、Mn、Ti、Fe、Cr及びPbのいずれか一以上の元素であって、Lnとして選択される元素以外の元素)を主成分とする非晶質相を主相とする、少なくともRの種類又はRの平均価数を異にする二種類以上の蛍光相から形成されていることを特徴とする透明蛍光体。 - 前記非晶質相を主相とする二種類以上の蛍光体粒子が混合され、該二種類以上の蛍光体粒子のうち30体積%以上が過冷却液体領域にある温度にて、前記蛍光体粒子の混合物が加圧されることにより得られることを特徴とする請求項1記載の透明蛍光体。
- 前記非晶質相を主相とし、過冷却液体領域が互いに重なり合う蛍光体粒子が混合され、前記過冷却液体領域が重なる温度にて、加圧されることにより得られることを特徴とする請求項1記載の透明蛍光体。
- 前記蛍光体粒子は、その構成成分からなる溶融粒子を冷却凝固して前記非晶質相を形成させたことを特徴とする請求項2又は3記載の透明蛍光体。
- 前記蛍光体粒子が球状蛍光体粒子であることを特徴とする請求項2乃至4いずれか記載の透明蛍光体。
- 前記非晶質相には、結晶質相が含有されていることを特徴とする請求項1乃至5いずれか記載の透明蛍光体。
- 前記結晶質相の長径は、200nm以下であることを特徴とする請求項6記載の透明蛍光体。
- AがAl、Si及びPのいずれか一以上の元素であり、LnがY、Gd、La、Dy及びLuのいずれか一以上の元素であり、RがEu、Tb、Ce、Sm、Tm及びPrのいずれか一以上の元素である請求項1乃至7いずれか記載の透明蛍光体。
- 前記非晶質相を主相とする二種類以上の蛍光体粒子を混合する工程と、
前記二種以上の蛍光体粒子の構成成分うち、30体積%以上が過冷却液体領域にある温度にて、前記蛍光体粒子の混合物を上記蛍光体粒子の混合物を加圧する工程と、
を備えたことを特徴とする請求項1又は2記載の透明蛍光体の製造方法。 - 前記非晶質相を主相とし、過冷却液体領域が互いに重なり合う蛍光体粒子を混合する工程と、
前記過冷却液体領域が重なる温度にて、前記蛍光体粒子の混合物を上記蛍光体粒子の混合物を加圧する工程と、
を備えたことを特徴とする請求項3記載の透明蛍光体の製造方法。 - 前記蛍光体粒子の構成成分からなる溶融粒子を冷却凝固して前記非晶質相を形成させることによって前記蛍光体粒子を得る工程をさらに備えたことを特徴とする請求項9又は10記載の透明蛍光体の製造方法。
- 前記蛍光体粒子が球状蛍光体粒子であることを特徴とする請求項9乃至11いずれか記載の透明蛍光体の製造方法。
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CN102031114A (zh) * | 2010-11-26 | 2011-04-27 | 中国科学院理化技术研究所 | 一种纳米结构球形荧光粉的制备方法 |
JP2011246662A (ja) * | 2010-05-28 | 2011-12-08 | Nippon Chem Ind Co Ltd | アルミン酸塩蛍光体、その製造方法及び発光素子 |
CN106336115A (zh) * | 2016-08-22 | 2017-01-18 | 温州大学 | 一种Mn2+掺杂的锗酸盐红光玻璃及其制备方法 |
WO2018225424A1 (ja) * | 2017-06-06 | 2018-12-13 | パナソニックIpマネジメント株式会社 | 波長変換体及びその製造方法、並びに波長変換体を用いた発光装置 |
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US9243777B2 (en) * | 2013-03-15 | 2016-01-26 | Cree, Inc. | Rare earth optical elements for LED lamp |
RU2549406C1 (ru) * | 2013-09-26 | 2015-04-27 | Открытое акционерное общество "Институт пластмасс имени Г.С. Петрова" | Полимерная люминесцентная композиция для получения белого света, возбуждаемая синим светодиодом |
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