WO2012026592A1 - 蛍光体、照明器具および画像表示装置 - Google Patents
蛍光体、照明器具および画像表示装置 Download PDFInfo
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- WO2012026592A1 WO2012026592A1 PCT/JP2011/069326 JP2011069326W WO2012026592A1 WO 2012026592 A1 WO2012026592 A1 WO 2012026592A1 JP 2011069326 W JP2011069326 W JP 2011069326W WO 2012026592 A1 WO2012026592 A1 WO 2012026592A1
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- 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
- C09K11/7784—Chalcogenides
- C09K11/7787—Oxides
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- 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
- C09K11/0883—Arsenides; Nitrides; Phosphides
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
- H01J1/00—Details of electrodes, of magnetic control means, of screens, or of the mounting or spacing thereof, common to two or more basic types of discharge tubes or lamps
- H01J1/54—Screens on or from which an image or pattern is formed, picked-up, converted, or stored; Luminescent coatings on vessels
- H01J1/62—Luminescent screens; Selection of materials for luminescent coatings on vessels
- H01J1/63—Luminescent screens; Selection of materials for luminescent coatings on vessels characterised by the luminescent material
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- the present invention relates to a phosphor composed of an inorganic crystal containing at least La, Si, Al, N (nitrogen), and an activating element, and uses thereof. More specifically, the present invention relates to a phosphor obtained by using a LaSi 9 Al 19 N 32 crystal or a solid solution crystal thereof as a base crystal and activating this with an activator element, and the use of the phosphor has the following properties: The present invention relates to a lighting apparatus and an image display device using a characteristic of emitting light having a peak at a wavelength of 410 nm or more and 550 nm or less.
- Phosphors are fluorescent display tubes (VFD (Vacuum-Fluorescent Display)), field emission displays (FED (Field Emission Display) or SED (Surface-Conduction Electron Display) (Plasma Display) (PDP). ), Cathode ray tube (CRT (Cathode-Ray Tube)), white light emitting diode (LED (Light-Emitting Diode)), and the like.
- VFD Voluum-Fluorescent Display
- FED Field Emission Display
- SED Surface-Conduction Electron Display
- Cathode ray tube CRT (Cathode-Ray Tube)
- white light emitting diode LED (Light-Emitting Diode)
- the phosphor is not limited to vacuum ultraviolet rays, ultraviolet rays, electron beams, blue light, etc. When excited by a high energy excitation source, it emits visible light.
- sialon phosphors and oxynitride phosphors are used as phosphors with little reduction in luminance instead of phosphors such as conventional silicate phosphors, phosphate phosphors, aluminate phosphors, and sulfide phosphors.
- phosphors such as nitride phosphors, in which an inorganic crystal containing nitrogen in the crystal structure is a base crystal.
- sialon phosphor is manufactured by a manufacturing process generally described below. First, silicon nitride (Si 3 N 4 ), aluminum nitride (AlN), and europium oxide (Eu 2 O 3 ) are mixed at a predetermined molar ratio, and the temperature is 1700 ° C. in nitrogen at 1 atm (0.1 MPa). It is manufactured by holding for 1 hour and firing by a hot press method (see, for example, Patent Document 1). It has been reported that ⁇ -sialon activated by Eu 2+ ions obtained by this process becomes a phosphor that emits yellow light of 550 to 600 nm when excited by blue light of 450 to 500 nm.
- a phosphor obtained by adding a rare earth element to ⁇ -sialon (see Patent Document 2) is known.
- Tb, Yb, and Ag When activated by Tb, Yb, and Ag, a phosphor emitting green light of 525 to 545 nm is obtained. It is shown.
- a green phosphor obtained by activating ⁇ -sialon with Eu 2+ (see Patent Document 3) is known.
- An example of an oxynitride phosphor is a blue phosphor obtained by activating a JEM phase (LaAl (Si 6-z Al z ) N 10-z O z ) with Ce as a base crystal (see Patent Document 4), La 3 A blue phosphor obtained by activating Si 8 N 11 O 4 with Ce as a base crystal (see Patent Document 5) is known.
- a red phosphor in which CaAlSiN 3 is activated with Eu 2+ as a base crystal is known.
- Japanese Patent No. 3668770 JP 60-2068889 A Japanese Patent No. 3921545 International Publication No. 2005/019376 Pamphlet JP 2005-112922 A Japanese Patent No. 3837588 Japanese Patent Laid-Open No. 2003-55657 JP 2004-285363 A JP 2006-335832 A
- phosphors that emit purple, blue, or green light are required in addition to red and yellow as phosphors that have excellent durability and high luminance.
- a conventional phosphor using oxynitride as a base crystal is an insulating material, and has a low emission intensity even when irradiated with an electron beam. For this reason, a phosphor that emits light with high brightness by an electron beam is required for use in an image display device excited by an electron beam such as an FED.
- the oxide phosphor disclosed in Patent Document 7 used for electron beam excitation may deteriorate during use, resulting in a decrease in emission intensity, and there is a possibility that the color balance may change in the image display device.
- the sulfide phosphor disclosed in Patent Document 8 may be decomposed during use, and sulfur may be scattered to contaminate the device.
- An object of the present invention is to meet such a demand, and is a phosphor that replaces a conventional rare earth activated sialon phosphor or oxide phosphor, and in particular, a phosphor that emits purple, blue, and green light. Is to provide. Furthermore, the present invention is to provide a phosphor that emits purple, blue, and green light efficiently by using an electron beam. In addition, the present invention intends to provide a phosphor powder with little decrease in emission intensity at high temperature.
- the inorganic crystal having a specific composition region range, a specific solid solution state, and a specific crystal phase becomes a purple, blue, or green phosphor having an emission peak at a wavelength in the range of 410 nm or more and 550 nm or less. Or, it has been found to be suitable for an image display device excited by an electron beam.
- Non-Patent Document 1 the crystal structure and composition of SrSi 9 Al 19 ON 31 crystal by electron microscope observation are clarified.
- Patent Document 9 there is described as a blue phosphor is added to Eu ion in the crystal, for LaSi 9 Al 19 N 32 crystal is present inventor has first found crystals.
- the phosphor according to the present invention includes at least La, Si, Al, N (nitrogen), and M element (where M is Ce, Pr, Nd, Sm, Eu, Gd, Tb, Dy, Ho, An inorganic crystal containing at least one element selected from the group consisting of Er, Tm, and Yb) and, if necessary, O (oxygen), the inorganic crystal is a LaSi 9 Al 19 N 32 crystal or the LaSi A solid solution crystal of 9 Al 19 N 32 crystal is used as a base crystal, and the base crystal is activated by the M element, thereby achieving the above object.
- the base crystal may be a LaSi 9 Al 19 N 32 crystal.
- the inorganic crystal is a La 1-x M x Si 9 Al 19 O y N 32-y crystal (where x is 0.001 ⁇ x ⁇ 0.99, and y is 0.001 ⁇ y ⁇ 0.99. ).
- the inorganic crystal may be a La 1-x Ce x Si 9 Al 19 N 32 crystal (where x is 0.001 ⁇ x ⁇ 0.99).
- the atomic fraction a of La, the atomic fraction b of Si, the atomic fraction c of Al, and the The atomic fraction d of O, the atomic fraction e of N, and the atomic fraction f of the M element are: 0.0001 ⁇ a ⁇ 0.03 (i) 0.1 ⁇ b ⁇ 0.2 (ii) 0.25 ⁇ c ⁇ 0.4 (iii) 0 ⁇ d ⁇ 0.1 (iv) 0.4 ⁇ e ⁇ 0.55 (v) 0.0001 ⁇ f ⁇ 0.02 (vi) May be satisfied.
- the fraction f is 0.015 ⁇ a ⁇ 0.018 (vii) 0.13 ⁇ b ⁇ 0.16 (viii) 0.29 ⁇ c ⁇ 0.33 (ix) 0 ⁇ d ⁇ 0.03 ... (x) 0.48 ⁇ e ⁇ 0.52 (xi) 0.0005 ⁇ f ⁇ 0.01 (xii) May be satisfied.
- the phosphor according to the present invention may have a peak emission wavelength at a wavelength between 410 nm and 550 nm by irradiation with an excitation source that is any one of ultraviolet rays, visible rays, electron beams, or X-rays.
- a lighting fixture comprising a light emitting source that emits light having a wavelength of 250 to 440 nm and a phosphor that converts light from the light emitting light source into a different wavelength.
- the phosphor includes the above-described phosphor. The above-described problem is achieved.
- the phosphor includes the above-described phosphor.
- the phosphor according to the present invention includes at least La, Si, Al, N (nitrogen), and M element (where M is Ce, Pr, Nd, Sm, Eu, Gd, Tb, Dy, Ho, An inorganic crystal containing at least one element selected from the group consisting of Er, Tm and Yb) and, if necessary, O (oxygen).
- This inorganic crystal is a LaSi 9 Al 19 N 32 crystal or a solid solution thereof.
- the crystal is a base crystal, and the base crystal is activated with an M element.
- the phosphor according to the present invention emits purple, blue or green light, and the emission intensity and emission wavelength can be controlled by adjusting the activation amount of the M element. In addition, since concentration quenching does not occur, the phosphor is extremely advantageous for material design.
- FIG. 6 is a diagram showing an X-ray diffraction profile of Example 2.
- FIG. 6 is a diagram showing an X-ray diffraction profile of Example 7.
- FIG. 2 It is a figure which shows the emission spectrum by the fluorescence measurement of Examples 2-7.
- the phosphor of the present invention includes at least La, Si, Al, N (nitrogen), and M element (where M is Ce, Pr, Nd, Sm, Eu, Gd, Tb, Dy, Ho, Er). , At least one element selected from the group consisting of Tm and Yb).
- the inorganic crystal may contain O (oxygen) as necessary.
- a LaSi 9 Al 19 N 32 crystal or a solid solution crystal of LaSi 9 Al 19 N 32 crystal is used as a base crystal, and this base crystal is activated by the above M element (M ions are the base material). Dissolved in the crystal).
- the phosphor of the present invention is called La sialon polytypoid. A model diagram of this crystal structure is shown in FIG.
- the LaSi 9 Al 19 N 31 crystal is a sialon crystal having a structure similar to that of the SrSi 9 Al 19 ON 31 crystal (see Non-Patent Document 1).
- a LaSi 9 Al 19 N 32 crystal or a solid solution crystal thereof can be identified by X-ray diffraction or neutron diffraction. Details of the crystal structure of the SrSi 9 Al 19 ON 31 crystal are described in Non-Patent Document 1 (the contents of Non-Patent Document 1 are referred to and incorporated herein), and the space group described in Non-Patent Document 1
- the X-ray diffraction pattern of the LaSi 9 Al 19 N 32 crystal or its solid solution crystal is uniquely determined using a model in which the Sr site in the atomic position data is replaced with La. The structural parameters of this crystal are shown in FIG.
- LaSi 9 Al 19 N 32 crystal By comparing the X-ray diffraction result of the product of the present invention with the calculated value using this model, it can be confirmed that it is a LaSi 9 Al 19 N 32 crystal.
- those whose lattice constants are changed by replacing constituent elements with other elements are also included as part of the present invention, and solid solutions of LaSi 9 Al 19 N 32 crystals It is called a crystal or a crystal having the same crystal structure as a LaSi 9 Al 19 N 32 crystal.
- the inorganic crystals constituting the phosphor of the present invention there is a La 1-x M x Si 9 Al 19 O y N 32-y crystal.
- x is 0.001 ⁇ x ⁇ 0.99
- y is 0.001 ⁇ y ⁇ 0.99.
- a phosphor having this composition is a phosphor with high luminous efficiency and high brightness. If M is Eu or Ce, the emission intensity is preferably high.
- x y may be sufficient.
- a La 1-x Eu x Si 9 Al 19 O y N 32-y crystal in which the M element is Eu (where x is 0.001 ⁇ x ⁇ 0.99 and y are preferably 0.001 ⁇ y ⁇ 0.99) because they have high emission intensity.
- the atomic fraction a of La, the atomic fraction b of Si, the atomic fraction c of Al, the atomic fraction d of O, the atomic fraction e of N, and the M element Atomic fraction f is 0.0001 ⁇ a ⁇ 0.03 (i) 0.1 ⁇ b ⁇ 0.2 (ii) 0.25 ⁇ c ⁇ 0.4 (iii) 0 ⁇ d ⁇ 0.1 (iv) 0.4 ⁇ e ⁇ 0.55 (v) 0.0001 ⁇ f ⁇ 0.02 (vi)
- a phosphor satisfying the above condition is preferable because of high emission intensity.
- the atomic fraction a of La, the atomic fraction b of Si, the atomic fraction c of Al, the atomic fraction d of O, the atomic fraction e of N, and the atomic fraction f of the M element are: 0.015 ⁇ a ⁇ 0.018 (vii) 0.13 ⁇ b ⁇ 0.16 (viii) 0.29 ⁇ c ⁇ 0.33 (ix) 0 ⁇ d ⁇ 0.03 ... (x) 0.48 ⁇ e ⁇ 0.52 (xi) 0.0005 ⁇ f ⁇ 0.01 (xii)
- a phosphor satisfying the above condition is particularly preferable because of high emission intensity.
- the phosphor of the present invention has an emission peak wavelength at a wavelength between 410 nm and 550 nm by irradiation of an excitation source which is any one of ultraviolet rays, visible rays, electron beams or X-rays. It can be used as a violet, blue, or green phosphor excited by rays or X-rays.
- an excitation source which is any one of ultraviolet rays, visible rays, electron beams or X-rays. It can be used as a violet, blue, or green phosphor excited by rays or X-rays.
- a luminaire comprising a light emitting light source that emits light having a wavelength of 250 to 440 nm and a phosphor that converts light of the light emitting light source into a different wavelength.
- the phosphor of the present invention has an emission peak wavelength at a wavelength between 410 nm and 550 nm by irradiation of an excitation source that is one of ultraviolet rays, visible light, electron beams, or X-rays.
- an excitation source that is one of ultraviolet rays, visible light, electron beams, or X-rays.
- the phosphor of the present invention may contain elements other than La, Si, Al, N, M elements, and O.
- boron and carbon may be taken in from a furnace body or a crucible during synthesis at a high temperature, but if it is 500 ppm or less, the light emission performance is less affected.
- the average particle size is preferably in the range of 0.1 ⁇ m or more and 20 ⁇ m or less from the viewpoint of dispersibility in the resin and fluidity of the powder. Further, by making the powder into single crystal particles in this range, the emission luminance is further improved.
- the phosphor of the present invention is preferable for white LED applications because it emits light having a peak in a wavelength range of 410 nm to 550 nm when excited with ultraviolet light or visible light having a wavelength of 250 nm to 440 nm.
- the emitted color varies depending on the composition. Since the phosphor of the present invention emits light at a wavelength of 253.7 nm emitted from vacuum ultraviolet rays or mercury atoms, it is suitable for use in plasma displays, fluorescent lamps, and mercury lamps.
- the phosphor of the present invention can be excited by an electron beam or X-ray.
- electron beam excitation emits light more efficiently than other nitride phosphors, and therefore is preferable for use in electron beam excitation image display devices.
- the phosphor of the present invention may be composed of a mixture of another crystal phase different from the inorganic crystal or an amorphous phase in addition to the above-described inorganic crystal.
- the other crystalline phase or amorphous phase can be, for example, a conductive inorganic material.
- the inorganic substance having conductivity is an oxide, an oxynitride, a nitride, or a mixture thereof containing at least one element selected from Zn, Ga, In, and Sn. Of these, indium oxide and indium-tin oxide (ITO) are preferable because of little decrease in emission intensity and high conductivity.
- the phosphor of the present invention develops in purple, blue, or green, but if it is necessary to mix with other colors such as yellow and red, an inorganic phosphor that develops these colors as necessary Can be mixed.
- examples of other inorganic phosphors that can be used include oxides, sulfides, oxysulfides, oxynitrides, and crystals having a nitride crystal as a base crystal. When durability of the mixed phosphor is required, it is preferable to use oxynitride or nitride crystal as a base crystal.
- Phosphors having an oxynitride or nitride crystal as a base crystal are: ⁇ -sialon: a yellow phosphor of Eu, ⁇ -sialon: a green phosphor of Eu, ⁇ -sialon: a blue phosphor of Ce, CaAlSiN 3 : Eu (Ca, Sr) AlSiN 3 : Eu red phosphor (a part of CaAlSiN 3 crystal Ca is replaced by Sr), blue phosphor (LaAl (Si 6-z Al z ) hosted by JEM phase) N 10-z O z ): Ce), La 3 Si 8 N 11 O 4 : Ce blue phosphor, AlN: Eu blue phosphor, and the like.
- the phosphor of the present invention has an excitation spectrum and a fluorescence spectrum that differ depending on the composition, and can be set to have various emission spectra by appropriately selecting and combining them. What is necessary is just to set the aspect so that it may have the emission spectrum required based on a use.
- the method for producing the phosphor of the present invention is not particularly limited, but the following method can be given as an example.
- the raw material mixture includes a metal containing La, an oxide, a carbonate, a nitride, a fluoride, a chloride, an oxynitride, or a combination thereof, a raw material containing silicon, a raw material containing aluminum, and the above-mentioned elements such as M element.
- the raw material mixture is filled in a container in a state where the relative bulk density is maintained at a filling rate of 40% or less. Then, it is fired in a temperature range of 1500 ° C. or more and 2200 ° C.
- the phosphor of the present invention in which at least M element is dissolved in LaSi 9 Al 19 N 32 crystal or its solid solution crystal can be manufactured.
- the optimum firing temperature may vary depending on the composition, and can be optimized as appropriate. In general, it is preferable to fire in a temperature range of 1700 ° C. or higher and 2000 ° C. or lower. In this way, a high-luminance phosphor can be obtained. When the firing temperature is lower than 1500 ° C., the formation rate of solid solution crystals may be low. On the other hand, if the firing temperature exceeds 2200 ° C., a special apparatus is required, which is not industrially preferable.
- raw materials containing silicon include metal silicon, silicon oxide, silicon nitride, organic precursors containing silicon, silicon diimide, and amorphous bodies obtained by heat treatment of silicon diimide. possible.
- silicon nitride has an advantage of being easily produced because it is produced as an industrial raw material. Silicon nitride is ⁇ -type, ⁇ -type, amorphous, and mixtures thereof.
- the raw material containing aluminum is metal aluminum, aluminum oxide, aluminum nitride, an organic precursor containing aluminum, or the like, but generally a mixture of aluminum nitride and aluminum oxide is preferably used.
- aluminum nitride and aluminum oxide are preferably designed from the ratio of oxygen and nitrogen in the target base crystal of the present invention.
- an inorganic compound that generates a liquid phase at a temperature lower than the firing temperature can be added to the raw material mixture as necessary.
- the inorganic compound those that generate a stable liquid phase at the reaction temperature are preferable, and fluoride, chloride, iodide, bromide, or phosphorus of Li, Na, K, Mg, Ca, Sr, Ba, and Al elements. Acid salts are suitable.
- these inorganic compounds may be added alone or in combination of two or more. Of these, calcium fluoride and aluminum fluoride are preferable because of their high ability to improve the reactivity of synthesis.
- the amount of the inorganic compound added is not particularly limited, but the effect is particularly great when it is 0.1 parts by weight or more and 10 parts by weight or less with respect to 100 parts by weight of the mixture of the metal compounds as the raw material mixture.
- the amount is less than 0.1 parts by weight, the reactivity is not improved, and when the amount exceeds 10 parts by weight, the luminance of the phosphor may be lowered.
- these inorganic compounds are added and baked, the reactivity is improved, grain growth is promoted in a relatively short time, and a single crystal having a large grain size grows, thereby improving the luminance of the phosphor.
- the nitrogen atmosphere is preferably a gas atmosphere in the pressure range of 0.1 MPa to 100 MPa. More preferably, it is 0.5 MPa or more and 10 MPa or less.
- silicon nitride is used as a raw material, heating to a temperature of 1820 ° C. or higher in a nitrogen gas atmosphere lower than 0.1 MPa is not preferable because the raw material is likely to be thermally decomposed. If it is 0.5 MPa or more, thermal decomposition of the raw material can be suppressed. If it is 10 MPa, the thermal decomposition of the raw material can be reliably suppressed, and if it is 100 MPa or more, a special apparatus is required, which is not suitable for industrial production.
- the raw material mixture after the mixing step has a form in which the fine powder having a particle size of several ⁇ m is aggregated to a size of several hundred ⁇ m to several mm (hereinafter referred to as “powder”). Called aggregates).
- the powder aggregate is fired in a state where the bulk density is maintained at a filling rate of 40% or less. More preferably, the bulk density is 20% or less.
- the relative bulk density is a ratio of a value (bulk density) obtained by dividing the mass of the powder filled in the container by the volume of the container and the true density of the substance of the powder.
- the powder powder aggregates having the same particle size without being mechanically applied to the powder or previously molded using a mold or the like are used as they are. Are filled at a filling rate of 40% or less in bulk density. If necessary, the powder aggregate can be granulated to an average particle size of 500 ⁇ m or less using a sieve or air classification, and the particle size can be controlled. Moreover, you may granulate directly in the shape of 500 micrometers or less using a spray dryer etc. Further, when the container is made of boron nitride, there is an advantage that there is little reaction with the phosphor.
- the reason why firing is performed while maintaining the bulk density at 40% or less is because firing is performed in a state where there is a free space around the raw material powder.
- the optimum bulk density varies depending on the shape and surface state of the granular particles, but is preferably 20% or less. In this way, the reaction product grows in a free space, so that the contact between the crystals is reduced and a crystal with few surface defects can be synthesized. Thereby, a fluorescent substance with high brightness is obtained. If the bulk density exceeds 40%, partial densification occurs during firing, resulting in a dense sintered body, which may hinder crystal growth and reduce the brightness of the phosphor. Moreover, it is difficult to obtain a fine powder. Further, the size of the powder aggregate is particularly preferably 500 ⁇ m or less because of excellent grindability after firing.
- the furnace used for firing may be a metal resistance heating method or a graphite resistance heating method because the firing temperature is high and the firing atmosphere is nitrogen.
- An electric furnace using carbon as the material for the high temperature part of the furnace is preferred.
- the firing is preferably performed by a firing method in which no mechanical pressure is applied from the outside, such as an atmospheric pressure sintering method or a gas pressure sintering method, in order to perform the firing while maintaining a bulk density in a predetermined range.
- the powder aggregate obtained by firing is agglomerated tightly, it is pulverized by a pulverizer generally used in industry such as a ball mill and a jet mill.
- a pulverizer generally used in industry such as a ball mill and a jet mill.
- ball milling makes it easy to control the particle size.
- the balls and pots used at this time are preferably made of a silicon nitride sintered body or a sialon sintered body. Grinding is performed until the average particle size becomes 20 ⁇ m or less.
- the average particle size is particularly preferably 20 nm or more and 10 ⁇ m or less.
- the average particle diameter exceeds 20 ⁇ m, the fluidity of the powder and the dispersibility in the resin are deteriorated, and the light emission intensity becomes uneven depending on the part when the light emitting device is formed in combination with the light emitting element.
- the thickness is 20 nm or less, the operability for handling the powder is deteriorated. If the desired particle size cannot be obtained only by grinding, classification can be combined. As a classification method, sieving, air classification, precipitation in a liquid, or the like can be used.
- the content of inorganic compounds other than phosphors such as glass phase, second phase, or impurity phase contained in the reaction product obtained by firing is reduced.
- a solvent water and an aqueous solution of an acid can be used.
- the acid aqueous solution sulfuric acid, hydrochloric acid, nitric acid, hydrofluoric acid, a mixture of organic acid and hydrofluoric acid, or the like can be used. Of these, a mixture of sulfuric acid and hydrofluoric acid is highly effective. This treatment is particularly effective for a reaction product obtained by adding an inorganic compound that generates a liquid phase at a temperature lower than the firing temperature and firing at a high temperature.
- the powder after firing or the powder whose particle size has been adjusted by pulverization or classification can be heat-treated at a temperature of 1000 ° C. or higher and lower than the firing temperature. At a temperature lower than 1000 ° C., the effect of removing surface defects is small. Above the firing temperature, the pulverized powders are fixed again, which is not preferable.
- the atmosphere suitable for the heat treatment varies depending on the composition of the phosphor, one or two or more mixed atmospheres selected from nitrogen, air, ammonia, and hydrogen can be used. Particularly, the nitrogen atmosphere is effective for defect removal. It is preferable because it is excellent.
- the phosphor of the present invention obtained as described above is characterized by having high luminance visible light emission.
- a specific composition is characterized by emitting purple, blue, or green light, and is suitable for lighting equipment and image display devices.
- it since it does not deteriorate even when exposed to high temperatures, it has excellent heat resistance, and excellent long-term stability in an oxidizing atmosphere and moisture environment.
- the lighting fixture of the present invention is configured using at least a light emitting source and the phosphor of the present invention.
- lighting fixtures include LED lighting fixtures and fluorescent lamps.
- An LED lighting apparatus is manufactured by using the phosphor of the present invention by a known method as described in JP-A-5-152609, JP-A-7-99345, JP-A-2927279, and the like. Can do.
- the light source emits light having a wavelength of 330 to 420 nm, and among these, an ultraviolet (or purple) LED light emitting element or LD light emitting element having a wavelength of 330 to 420 nm is preferable.
- These light emitting elements include those made of nitride semiconductors such as GaN and InGaN, and can be light emitting light sources that emit light of a predetermined wavelength by adjusting the composition.
- a lighting fixture emitting a desired color can be configured by using it together with a phosphor having other light emission characteristics.
- an ultraviolet LED or LD light emitting device of 330 to 400 nm, a yellow phosphor excited at this wavelength and having an emission peak at a wavelength of 550 nm to 600 nm, and the phosphor of the present invention (for example, blue light emission) There are combinations.
- Ce can be mentioned. In this configuration, when the phosphors are irradiated with ultraviolet rays emitted from the LED or LD, light of two colors, blue and yellow, is emitted, and a white luminaire is obtained by mixing them.
- a green phosphor include ⁇ -sialon: Eu 2+ described in JP-A-2005-255895
- examples of a red phosphor include CaSiAlN 3 : Eu 2+ described in International Publication No. 2005/052087. be able to.
- the phosphors are irradiated with ultraviolet rays emitted from the LED or LD, light of three colors of red, green, and blue is emitted, and a white lighting device is obtained by mixing these.
- a yellow phosphor having a light emission peak a red phosphor having an emission peak at a wavelength of 600 nm to 700 nm when excited at this wavelength, and the phosphor of the present invention (for example, blue light emission).
- ⁇ -sialon: Eu 2+ described in JP-A-2005-255895 is used.
- ⁇ -sialon: Eu 2+ described in JP-A-2002-363554 is used.
- 3 : Eu can be mentioned.
- ultraviolet light emitted from an LED or LD is irradiated onto a phosphor, light of four colors of blue, green, yellow, and red is emitted, and the light is mixed to produce a white or reddish light bulb-colored luminaire. It becomes.
- the image display device of the present invention is composed of at least an excitation source and the phosphor of the present invention, such as a fluorescent display tube (VFD), a field emission display (FED or SED), a plasma display panel (PDP), a cathode ray tube (CRT), etc.
- a fluorescent display tube VFD
- FED or SED field emission display
- PDP plasma display panel
- CRT cathode ray tube
- the phosphor of the present invention has been confirmed to emit light by excitation of vacuum ultraviolet rays of 100 to 190 nm, ultraviolet rays of 190 to 380 nm, electron beams, etc., and in combination of these excitation sources and the phosphor of the present invention, An image display apparatus as described above can be configured.
- the phosphor of the present invention is suitable for VFD, FED, SED, and CRT applications that are used at an acceleration voltage of 10 V or higher and 30 kV or lower because of its excellent electron beam excitation efficiency.
- the FED is an image display device that emits light by accelerating electrons emitted from a field emission cathode and colliding with a phosphor applied to the anode, and is required to emit light at a low acceleration voltage of 5 kV or less. By combining these phosphors, the light emission performance of the display device is improved.
- Si 3 N 4 , AlN, Eu 2 O 3 and LaN were used as the raw material mixture.
- a nitride was used as a La-substituted raw material for charge compensation.
- the raw material mixture was baked in a gas pressure furnace at 2000 ° C. for 4 hours under a nitrogen atmosphere and 10 atm.
- the raw material powder used for mixing was silicon nitride powder having a specific surface area of 11.2 m 2 / g, an oxygen content of 1.29 wt%, and an ⁇ -type content of 95% (Ube Industries, Ltd.) SN-E10 grade), aluminum nitride powder with a specific surface area of 3.3 m 2 / g and oxygen content of 0.85 wt% (F grade made by Tokuyama Corp.), purity 99.9% Lanthanum nitride powder (manufactured by Wako Pure Chemical Industries, Ltd.) and europium oxide powder (manufactured by Shin-Etsu Chemical) having a purity of 99.9% were used.
- La 1-x Eu x Si 9 Al 19 O y N 32-y , x 0, 0.01, 0.1, 0.3, They were weighed and mixed so as to be 0.5, 0.7, and 0.9 (in order, Examples 1, 2, 3, 4, 5, 6, and 7). More specifically, these powders are weighed so as to have a predetermined mixed composition in a glove box adjusted to a nitrogen gas atmosphere with oxygen and water contents of 1 ppm or less, and a pestle and a mortar made of boron nitride are measured. After 10 minutes of mixing, the resulting mixture was allowed to drop spontaneously through a 500 ⁇ m sieve into a boron nitride crucible, and the crucible was filled with powder. The bulk density of the powder was about 25% to 30%.
- Each crucible containing each mixed powder was set in a gas pressure furnace.
- the firing atmosphere is set to a vacuum of 10 ⁇ 3 Pa using a diffusion pump, heated from room temperature to 800 ° C. at a rate of 500 ° C. per hour, and nitrogen having a purity of 99.999% by volume is introduced at 800 ° C.
- the pressure was 10 MPa, the temperature was raised to 2000 ° C. at 500 ° C. per hour, and the temperature was maintained for 4 hours.
- FIG. 6 is a diagram showing an emission spectrum by fluorescence measurement of Examples 2 to 7.
- the products obtained in Examples 1 to 7 are phosphors composed of inorganic crystals of La 1-x Eu x Si 9 Al 19 O y N 32-y , and examples 2 to 2 activated with Eu.
- the product of No. 7 was confirmed to emit blue-green light. Further, according to FIG. 6, it was found that the emission intensity monotonously increases with the increase in the amount of Eu activation, and the emission wavelength becomes longer. Further, it was found that concentration quenching did not occur, and that it was a stoichiometric phosphor similar to Sr sialon polytypoid (see Patent Document 9). The emission wavelength was not significantly different from that of Sr sialon polytypoid. It was suggested that the substitution of the sialon polytypoid with the parent element has little effect on the luminescence properties.
- Si 3 N 4 , AlN, Eu 2 O 3 and CaCO 3 were used as the raw material powder. Specifically, the same silicon nitride powder, aluminum nitride powder, europium oxide powder, and calcium carbonate powder with a purity of 99.99% (high purity chemical reagent grade) were used.
- the X-ray diffraction profile was measured using the X-ray powder diffractometer, and the crystal structure was identified. The presence of ⁇ -sialon phase was confirmed from the X-ray diffraction profile (not shown), and the presence of Ca sialon polytypoid was not confirmed.
- the phosphor of the present invention emits purple, blue, or green light, and further, since the luminance of the phosphor is less decreased when exposed to an excitation source, it is suitable for VFD, FED, PDP, CRT, white LED, etc.
- the phosphor used In the future, it is expected to contribute greatly to industrial development by being widely used in various electron beam excitation display devices.
Abstract
Description
前記無機結晶は、La1-xMxSi9Al19OyN32-y結晶(ただし、xは、0.001≦ x ≦0.99、yは、0.001≦ y ≦0.99)であり得る。
0.0001≦ a ≦0.03 ・・・・・・・・・・・・・(i)
0.1≦ b ≦0.2 ・・・・・・・・・・・・・・・・(ii)
0.25≦ c ≦0.4 ・・・・・・・・・・・・・・(iii)
0≦ d ≦0.1 ・・・・・・・・・・・・・・・・・・(iv)
0.4≦ e ≦0.55 ・・・・・・・・・・・・・・・・(v)
0.0001≦ f ≦0.02 ・・・・・・・・・・・・(vi)
を満たしてもよい。
0.015≦ a ≦0.018 ・・・・・・・・・・・(vii)
0.13≦ b ≦0.16 ・・・・・・・・・・・・(viii)
0.29≦ c ≦0.33 ・・・・・・・・・・・・・・(ix)
0≦ d ≦0.03 ・・・・・・・・・・・・・・・・・・(x)
0.48≦ e ≦0.52 ・・・・・・・・・・・・・・(xi)
0.0005≦ f ≦0.01 ・・・・・・・・・・・(xii)
を満たしてもよい。
0.0001≦ a ≦0.03 ・・・・・・・・・・・・・(i)
0.1≦ b ≦0.2 ・・・・・・・・・・・・・・・・(ii)
0.25≦ c ≦0.4 ・・・・・・・・・・・・・・(iii)
0≦ d ≦0.1 ・・・・・・・・・・・・・・・・・・(iv)
0.4≦ e ≦0.55 ・・・・・・・・・・・・・・・・(v)
0.0001≦ f ≦0.02 ・・・・・・・・・・・・(vi)
を満たす蛍光体は、発光強度が高く、好ましい。
0.015≦ a ≦0.018 ・・・・・・・・・・・(vii)
0.13≦ b ≦0.16 ・・・・・・・・・・・・(viii)
0.29≦ c ≦0.33 ・・・・・・・・・・・・・・(ix)
0≦ d ≦0.03 ・・・・・・・・・・・・・・・・・・(x)
0.48≦ e ≦0.52 ・・・・・・・・・・・・・・(xi)
0.0005≦ f ≦0.01 ・・・・・・・・・・・(xii)
を満たす蛍光体は、特に発光強度が高く、好ましい。
Claims (10)
- 少なくとも、Laと、Siと、Alと、N(窒素)と、M元素(ただし、Mは、Ce、Pr、Nd、Sm、Eu、Gd、Tb、Dy、Ho、Er、TmおよびYbからなる群から選ばれる少なくとも1種の元素)と、必要に応じてO(酸素)とを含む無機結晶からなり、
前記無機結晶は、LaSi9Al19N32結晶または前記LaSi9Al19N32結晶の固溶体結晶を母体結晶とし、前記母体結晶を前記M元素で付活した結晶である、蛍光体。 - 前記母体結晶は、LaSi9Al19N32結晶である、請求項1に記載の蛍光体。
- 前記無機結晶は、La1-xMxSi9Al19OyN32-y結晶(ただし、xは、0.001≦ x ≦0.99、yは、0.001≦ y ≦0.99)である、請求項1に記載の蛍光体。
- 前記無機結晶は、La1-xEuxSi9Al19OyN32-y結晶(ただし、xは、0.001≦ x ≦0.99、x=y)である、請求項1に記載の蛍光体。
- 前記無機結晶は、La1-xCexSi9Al19N32結晶(ただし、xは、0.001≦ x ≦0.99)である、請求項1に記載の蛍光体。
- 前記無機結晶における前記Laの原子分率aと、前記Siの原子分率bと、前記Alの原子分率cと、前記Oの原子分率dと、前記Nの原子分率eと、前記M元素の原子分率fとは、
0.0001≦ a ≦0.03 ・・・・・・・・・・・(i)
0.1≦ b ≦0.2 ・・・・・・・・・・・・・・(ii)
0.25≦ c ≦0.4 ・・・・・・・・・・・・(iii)
0≦ d ≦0.1 ・・・・・・・・・・・・・・・・(iv)
0.4≦ e ≦0.55 ・・・・・・・・・・・・・・(v)
0.0001≦ f ≦0.02 ・・・・・・・・・・(vi)
を満たす、請求項1に記載の蛍光体。 - 前記Laの原子分率aと、前記Siの原子分率bと、前記Alの原子分率cと、前記Oの原子分率dと、前記Nの原子分率eと、前記M元素の原子分率fとは、
0.015≦ a ≦0.018 ・・・・・・・・・(vii)
0.13≦ b ≦0.16 ・・・・・・・・・・(viii)
0.29≦ c ≦0.33 ・・・・・・・・・・・・(ix)
0≦ d ≦0.03 ・・・・・・・・・・・・・・・・(x)
0.48≦ e ≦0.52 ・・・・・・・・・・・・(xi)
0.0005≦ f ≦0.01 ・・・・・・・・・(xii)
を満たす、請求項6に記載の蛍光体。 - 紫外線、可視光線、電子線またはX線の何れかである励起源の照射により、410nmから550nmの間の波長に発光のピーク波長を持つ、請求項1に記載の蛍光体。
- 250~440nmの波長の光を発する発光光源と、発光光源の光を異なる波長に変換する蛍光体とから構成される照明器具において、前記蛍光体は、請求項1に記載の蛍光体を含む、照明器具。
- 励起源と蛍光体とを含む画像表示装置であって、前記蛍光体は、請求項1に記載の蛍光体を含む、画像表示装置。
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