WO2007105598A1 - アルミン酸塩系蛍光体の製法およびアルミン酸塩系蛍光体 - Google Patents
アルミン酸塩系蛍光体の製法およびアルミン酸塩系蛍光体 Download PDFInfo
- Publication number
- WO2007105598A1 WO2007105598A1 PCT/JP2007/054558 JP2007054558W WO2007105598A1 WO 2007105598 A1 WO2007105598 A1 WO 2007105598A1 JP 2007054558 W JP2007054558 W JP 2007054558W WO 2007105598 A1 WO2007105598 A1 WO 2007105598A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- aluminate
- metal
- acid
- phosphor
- chelating agent
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Ceased
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Classifications
-
- 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 materials, e.g. electroluminescent or chemiluminescent
- C09K11/08—Luminescent materials, e.g. electroluminescent or chemiluminescent containing inorganic luminescent materials
- C09K11/77—Luminescent materials, e.g. electroluminescent or chemiluminescent containing inorganic luminescent materials containing rare earth metals
- C09K11/7728—Luminescent materials, e.g. electroluminescent or chemiluminescent containing inorganic luminescent materials containing rare earth metals containing europium
- C09K11/7734—Aluminates
-
- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01F—COMPOUNDS OF THE METALS BERYLLIUM, MAGNESIUM, ALUMINIUM, CALCIUM, STRONTIUM, BARIUM, RADIUM, THORIUM, OR OF THE RARE-EARTH METALS
- C01F17/00—Compounds of rare earth metals
- C01F17/30—Compounds containing rare earth metals and at least one element other than a rare earth metal, oxygen or hydrogen, e.g. La4S3Br6
- C01F17/32—Compounds containing rare earth metals and at least one element other than a rare earth metal, oxygen or hydrogen, e.g. La4S3Br6 oxide or hydroxide being the only anion, e.g. NaCeO2 or MgxCayEuO
- C01F17/34—Aluminates, e.g. YAlO3 or Y3-xGdxAl5O12
-
- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01P—INDEXING SCHEME RELATING TO STRUCTURAL AND PHYSICAL ASPECTS OF SOLID INORGANIC COMPOUNDS
- C01P2002/00—Crystal-structural characteristics
- C01P2002/50—Solid solutions
-
- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01P—INDEXING SCHEME RELATING TO STRUCTURAL AND PHYSICAL ASPECTS OF SOLID INORGANIC COMPOUNDS
- C01P2002/00—Crystal-structural characteristics
- C01P2002/80—Crystal-structural characteristics defined by measured data other than those specified in group C01P2002/70
- C01P2002/84—Crystal-structural characteristics defined by measured data other than those specified in group C01P2002/70 by UV- or VIS- data
Definitions
- the present invention relates to a method for producing an aluminate phosphor, and to the aluminate phosphor produced by the method.
- Phosphors having an aluminate as a mother structure are widely put into practical use as ultraviolet-excited phosphors that emit light mainly in a blue to green color tone region.
- PDPs plasma display panels
- development of vacuum ultraviolet ray excited light emitting devices having a mechanism for exciting a phosphor by the vacuum ultraviolet rays emitted by rare gas discharge to emit light has been actively conducted.
- several aluminate phosphors have been put to practical use for PDPs that emit blue to green light.
- the aluminate is represented by the composition formula: xMO. YAl 2 O (wherein, M is an alkaline earth metal)
- phosphors of various compositions are manufactured by introducing a plurality of divalent metals or doping an M site with a rare earth metal or Mn as an activator. For example, it has been confirmed that blue light is emitted by ultraviolet excitation when metal doped with Ba and Mg as metal M, and doped with Eu as an activator at the Ba site.
- representative ones are, for example, BaM g Al 2 O 3: Eu disclosed in JP-B-52-22836, or BaMgAl 2 O 3: Eu disclosed in Japanese Patent Application Laid-Open No. 08-115673.
- Mn is known as a green phosphor that emits green fluorescence upon ultraviolet excitation
- Ce and Tb activated lanthanum 'magnesium' to further enhance the light emission characteristics.
- a part of Ba in Zn-halide green phosphor (Japanese Unexamined Patent Publication No. H06-240252) or a manganese-substituted barium lumium aluminate phosphor is replaced with Zn, and the remaining Ba is replaced with Sr,
- a Ce--Mn co-activated green phosphor in which Ce is activated Japanese Patent Laid-Open No. 2000-290647
- europium activated strontium aluminate exhibiting a bluish green color with an emission peak wavelength of 493 nm is also known.
- This phosphorescent phosphor is MAIO (wherein, M is selected from Ca, Sr and Ba)
- At least one kind of metal element is a parent structure.
- a luminescent phosphor one in which Eu as an activator and another rare earth element as a coactivator are known (Japanese Patent Application Laid-Open No. 07-11250).
- a part of aluminum of the matrix aluminate is replaced with boron and contained to stabilize the crystal to improve the afterglow property (Japanese Patent Laid-Open No. 08-73845), the matrix is Sr Al O And you
- Examples thereof include those obtained by adding 2 ⁇ 11> ⁇ 1> ⁇ 1> ⁇ 1> ⁇ 1> ⁇ 1> ⁇ 212 ⁇ H ⁇ H 2000) to addition of dysprosium as a co- activation agent.
- the conventional aluminate phosphor is composed of an oxide containing three or more metals, and in the production of these phosphors, the respective metal components are mixed uniformly. It becomes important whether they match.
- phosphors are manufactured by a method of obtaining a composite metal oxide by mixing and calcining a solid phase raw material so as to obtain a desired metal composition ratio, that is, by the classical method of solid phase method. It is done.
- this solid phase method a plurality of metal oxides are mixed in the solid phase state, so even if they are uniformly mixed, they are clearly heterogeneous phases when viewed microscopically. Also, no matter how carefully the metal composition ratio and the doping amount of the metal element are controlled, and even if the composition ratio of the metal component contained in each individual particle is controlled as desired, within the particle It is impossible in principle to produce phosphors in which the metal distribution is completely uniform.
- a precursor having a uniform composite metal composition as a precursor immediately before that is used.
- sol-gel method and coprecipitation
- a liquid phase method which emphasizes a chemical method represented by the law.
- the metal composition ratio of the obtained powder must be nonuniform.
- the hydrolysis rate and solubility product of the metal compound differ depending on the type of metal, and the metal composition ratio of the precipitate formed in the subsequent process such as hydrolysis, neutralization or precipitation becomes uneven. It is considered that such nonuniformity of the metal composition also has a considerable adverse effect on the fluorescence characteristics of the complex oxide-based or aluminate-based phosphors.
- the present inventors have developed a technology described in WO 2005/090513 as a result of repeated research aiming at development of a novel aluminate blue phosphor.
- the present invention relates to a novel blue phosphor represented by Sr Al 2 O 3: Eu, which has various uses.
- this phosphor has a light emission peak wavelength of 41 Onm, which is somewhat close to ultraviolet light, there is still room for improvement in its application to displays and three-wavelength fluorescent lamps. That is, if it is possible to give such a characteristic that it is desirable to bring the emission peak wavelength closer to the vicinity of 45 Onm, which is better in color purity, to be applied to these applications, the applications will be dramatically increased. Is a must.
- the present invention has been made under such circumstances, and is a further development of the technology described in the above-mentioned WO 2005/090513 publication.
- the object of the present invention is to focus on an aluminate-based phosphor which has been confirmed to emit fluorescence by ultraviolet excitation and electron beam excitation, and to emit ultraviolet light which has a uniform composition and a higher degree of blueness, and emits fluorescence.
- the aim is to develop a new electron beam excited type aluminate phosphor.
- Another object of the present invention is to provide a method capable of efficiently producing such a phosphor.
- the method for producing an aluminate phosphor according to the present invention is a composition formula: 7 (Sr Eu) 0-yAl O (
- x, y is 0 ⁇ x ⁇ 0.5, l ⁇ y ⁇ 36), and the reducing atmosphere in the state in which an anolamine salt is in contact with an acid manganate. It is characterized in that it includes the step of heating inside.
- the aluminate phosphor of the present invention is produced by the above method, and is an ultraviolet ray. It is characterized by emitting light at an emission peak wavelength of 450 to 470 nm by excitation and electron beam excitation.
- FIG. 1 is an emission spectrum diagram when the aluminate-based phosphor obtained in the example is irradiated with ultraviolet light with an excitation wavelength of 325 nm.
- composition formula used in the method of the present invention 7 (Sr Eu) ⁇ 'yAl ⁇
- the range of (y) is the range of “1 ⁇ y ⁇ 36”.
- the value of (X) is determined as described above.
- a more preferable range of (X) is the range of “0. 001 ⁇ x ⁇ 0.3”, and the highest light emission characteristic is exhibited in this range.
- the value of (y) is set in the above range.
- the more preferable range of (y) is the range of “3 ⁇ y ⁇ 27”, and the highest light emission characteristic is exhibited in this range
- the aluminate represented by the compositional formula: 7 (Sr Eu) 0 -yAl 2 O has the following properties: (1) Sr, Eu and Al
- the organic metal chelate powder to be a precursor is each metal compound and an organic chelating agent.
- the aqueous solution can be easily obtained, for example, by spray-drying after being mixed so as to obtain a predetermined metal composition ratio to obtain a clear organic metal chelate aqueous solution.
- a powder containing organometallic chelates of Sr, Eu and A1 is produced.
- This manufacture is performed, for example, as follows.
- Sr and Eu are precisely weighed so as to obtain a predetermined metal composition, and these are reacted with an organic chelating agent to prepare a clear organic metal chelate aqueous solution.
- This reaction is carried out in an aqueous medium, for example, at a temperature of 20 ° C to boiling point, preferably 50 to 70 ° C.
- the preferred aqueous solution concentration is 5% by mass or more and 30% by mass or less, more preferably 10% by mass or more and 20% by mass or less in terms of solid content conversion, but of course it is not limited to this temperature range.
- the amount of the organic chelating agent used is preferably at least 1.0 times mol and not more than 1.5 times mol based on the metal ion so that all the metals can be completely dissolved. .
- the metal chelate or the organic chelating agent is not completely dissolved, in the case where ammonia or an amine is added, it is preferable to completely dissolve it.
- the organic metal chelates of the above-mentioned respective metals may be prepared separately, and they may be precisely weighed and mixed so as to obtain a predetermined metal ratio.
- the present invention which uses carbonates, nitrates, hydroxides, oxides, etc., as metal raw materials, in the present invention using strontium and europium, has good reactivity and excess ions after the reaction. It is an oxide or carbonate in which etc. do not remain.
- aluminum considering the reactivity with organic chelating agents, usable raw materials are substantially limited to salts, sulfates and nitrates, and nitrate is preferred. Among them, it is particularly preferable to first produce an aluminum chelate solution using chloride, sulfate or nitrate, pre-produce high purity aluminum chelate crystals by crystallization, and use this as an aluminum source. .
- organic metal chelates sodium salts and potassium salts remain in the fluorescent body even after thermal decomposition, and they should not be used because they cause the composition of the fluorescent body to be upset.
- organic acids such as hydrochloric acid, sulfuric acid, phosphoric acid or their salts, etc. and inorganic acids and inorganic acid salts containing chlorine, sulfur or phosphorus, etc .; and thiol compounds are preferably not used as much as possible. These are almost completely pyrolyzed in the firing process, but complex metal chelates of uniform composition Because there is a risk of adversely affecting the generation of
- organic chelating agent used in the present invention examples include ethylenediamine tetraacetic acid, 1,2-cyclohexanediamine tetraacetic acid, dihydroxyglycine, diamineopropanoltetraacetic acid, diethylenetriaminepentaacetic acid, ethylenediamine diacetic acid and ethylenediamine Dipropionic acid, Hydroxyethylenediamine triacetic acid, Glycoletherdiamine triacetic acid, Hexamethylendiaminetetraacetic acid, Ethylenediamine di (o-hydroxyphenyl) acetic acid, Hydroxye noreimino diacetic acid, Iminoniacetic acid, 1,3-Diaminopropane Tetraacetic acid, 1,2-Diaminopropane tetraacetic acid, 2-tri-portal triacetic acid, 2-tri-portal 3-propionic acid, triethylenetetramine hexaacetic acid, ethylenediamine dibasic acid, 1,3-dimine
- organometallic chelate a complex composed of an aminocarboxylic acid chelating agent and a metal ion, and / or a salt thereof is used.
- aminocarboxylic acid chelating agent more preferably, at least one selected from the group consisting of ditritrichloroacetic acid, ethylenediamine tetraacetic acid, diethylenetriaminepentaacetic acid, and triethylenetetramine hexaacetic acid is used.
- the free acid type, ammonium salt or amine salt is used, and the chelate formation constant with each metal, the stability of the metal chelate, and the solubility of the metal chelate in water or alkaline aqueous solution are taken into consideration. It is desirable to select an appropriate one for each metal component to be used.
- the organic metal chelate aqueous solution prepared as described above is then powdered by spray drying.
- the conditions for spray drying may be appropriately set according to the concentration of the aqueous solution, the solution processing rate, the amount of air for spraying, the amount of air for hot air, etc.
- the drying temperature is preferably the temperature at which the organic substance is not decomposed. Also, a temperature sufficient to dry sufficiently may be employed. From this point of view, the drying temperature is generally in the range of 140 to 180 ° C., more preferably in the range of about 100 to 200 ° C. Considering such drying temperatures, the above amino acids used in the present invention are It is desirable to select the one that does not thermally decompose at a temperature of about 200 ° C. or less as the rubonic acid-based chelating agent.
- the organometallic chelate powder obtained as described above is then fired to form a metal oxide.
- the preferable conditions at this time are as follows.
- the organic metal chelate powder obtained as described above is fired as it is, the organic component is thermally decomposed to form a complex oxide powder.
- the organic components are completely decomposed, for example, at 500 ° C. or higher, all the organic components are decomposed and burned off to form a composite metal oxide.
- the crystallinity of the composite metal oxide is improved as the calcination temperature is raised, so that the calcination can be carried out at a temperature of up to 1600 ° C. if necessary.
- the atmosphere for firing and heating is not necessarily in the air, and may be performed in an oxygen-enriched atmosphere, a neutral atmosphere, or a reducing atmosphere, as necessary. Preferably, it is fired in an atmosphere containing at least one selected from the group consisting of air, oxygen and nitrogen.
- the aluminate powder obtained as described above is brought into contact with magnesium oxide and heated in a reducing atmosphere while maintaining the contact state, the aluminate phosphor according to the present invention is obtained.
- the shape of the magnesium oxide used herein is not particularly limited. For example, coarse particles, fine particles, thin films, substrates and the like can be used. Also, they may be single crystals or polycrystals.
- magnesium oxide of magnesium oxide becomes an aluminate powder at the contact interface between the aluminate powder and the magnesium oxide.
- Thermal diffusion The resulting phosphor has a crystal structure clearly different from that of the strontium aluminate phosphor disclosed in the above-mentioned WO 2005/090513. That is, according to the method of the present invention, a novel blue phosphor having a novel crystal structure and composition and emitting specific fluorescence at an emission peak wavelength of 450 to 470 nm is obtained.
- the heating conditions at this time may be heating the precursor powder in a contact state in a reducing atmosphere, and the preferable heating temperature is 500 ° C. or more and 1600 ° C. or less, more preferably 800 ° C. or more and 1500 ° C. C or less, more preferably in the range of 800 ° C. or more and 1500 ° C. or less.
- the reducing atmosphere is not particularly limited, it is preferable to use an argon / hydrogen mixed atmosphere or nitrogen / water. It is an elementary mixed atmosphere.
- the aluminate phosphor of the present invention is produced by the above-mentioned method of the present invention, but the composition formula after thermal reduction has not been clarified until now. Force This heat-reduced product exerts a specific fluorescence characteristic to generate blue emission of high color purity which emits light specifically at an emission peak wavelength of 450 to 470 nm by ultraviolet excitation and electron beam excitation as described above.
- the phosphor of the present invention produces blue light with a specific high color purity at an emission peak wavelength of 450 to 470 nm as described above, but its fluorescence lifetime is extremely short. This is in contrast to the very long or afterglow fluorescence lifetime of the strontium aluminate phosphor disclosed in the prior art cited above.
- This solution was powdered by a spray drying method at a drying temperature of 160 ° C. to obtain (Sr, Al, Eu) -EDTA complex powder.
- An X-ray diffraction chart of this powder was confirmed, and it showed a halo figure due to scattering of incident X-rays, and the crystal structure was amorphous.
- the complex powder was calcined at 800 ° C. for 3 hours in an open-air electric furnace to thermally decompose and remove the organic matter, to obtain an aluminate powder.
- Olg is dispersed in ethanol, dropped onto a (100) oriented magnesium oxide substrate (10 mm x 10 mm) and dried, and then in a stream of Ar + H (3%) By heating and reducing at 1400 ° CX for 24 hours
- a phosphor film was produced.
- This phosphor film when it is irradiated with ultraviolet light at an excitation wavelength of 325 nm is shown in FIG. As apparent from this figure, it can be seen that it emits blue light with high color purity and high luminance, with an emission peak wavelength of 450 to 470 nm.
- the emission spectrum by electron beam excitation with an acceleration voltage of 30 kV was also confirmed to be the same spectrum as FIG. 1, and it was confirmed that it is a blue phosphor applicable to both ultraviolet excitation and electron beam excitation.
- the aluminate-based phosphor of the present invention is used as a blue phosphor such as a three-wavelength fluorescent lamp using an ultraviolet ray as an excitation source, a brama display, etc., and a cathode ray tube or a fluorescent display tube using an electron beam as an excitation source. It can be very effectively used as a phosphor to be used.
- a blue phosphor having the above-mentioned characteristics can be efficiently produced, and can be provided as a phosphor which can be widely and effectively utilized for various applications.
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- Organic Chemistry (AREA)
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- Luminescent Compositions (AREA)
Abstract
Description
Claims
Priority Applications (4)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2008505094A JP5261667B2 (ja) | 2006-03-10 | 2007-03-08 | アルミン酸塩系蛍光体の製法およびアルミン酸塩系蛍光体 |
| US12/224,881 US20090047202A1 (en) | 2006-03-10 | 2007-03-08 | Method for Producing Aluminate Phosphor and Aluminate Phosphor |
| EP07738048A EP2006348A4 (en) | 2006-03-10 | 2007-03-08 | METHOD FOR PRODUCING ALUMINUM FLUORATE AND ALUMINATE FLUORATE |
| CN2007800085991A CN101400758B (zh) | 2006-03-10 | 2007-03-08 | 铝酸盐系荧光体的制备方法和铝酸盐系荧光体 |
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2006066170 | 2006-03-10 | ||
| JP2006-066170 | 2006-03-10 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| WO2007105598A1 true WO2007105598A1 (ja) | 2007-09-20 |
Family
ID=38509423
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| PCT/JP2007/054558 Ceased WO2007105598A1 (ja) | 2006-03-10 | 2007-03-08 | アルミン酸塩系蛍光体の製法およびアルミン酸塩系蛍光体 |
Country Status (5)
| Country | Link |
|---|---|
| US (1) | US20090047202A1 (ja) |
| EP (1) | EP2006348A4 (ja) |
| JP (1) | JP5261667B2 (ja) |
| CN (1) | CN101400758B (ja) |
| WO (1) | WO2007105598A1 (ja) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2012121161A1 (ja) * | 2011-03-04 | 2012-09-13 | 国立大学法人長岡技術科学大学 | 塩化セシウム型類似構造の酸化ストロンチウム結晶の製造方法 |
| JP5868542B1 (ja) * | 2014-12-12 | 2016-02-24 | 大電株式会社 | 窒化物または酸窒化物を母体とする蛍光体の製造方法、蛍光体、発光素子、及び発光装置 |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP6923804B2 (ja) * | 2017-12-08 | 2021-08-25 | 日亜化学工業株式会社 | 波長変換部材及びその製造方法 |
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- 2007-03-08 JP JP2008505094A patent/JP5261667B2/ja not_active Expired - Fee Related
- 2007-03-08 WO PCT/JP2007/054558 patent/WO2007105598A1/ja not_active Ceased
- 2007-03-08 CN CN2007800085991A patent/CN101400758B/zh not_active Expired - Fee Related
- 2007-03-08 US US12/224,881 patent/US20090047202A1/en not_active Abandoned
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2012121161A1 (ja) * | 2011-03-04 | 2012-09-13 | 国立大学法人長岡技術科学大学 | 塩化セシウム型類似構造の酸化ストロンチウム結晶の製造方法 |
| JPWO2012121161A1 (ja) * | 2011-03-04 | 2014-07-17 | 国立大学法人長岡技術科学大学 | 塩化セシウム型類似構造の酸化ストロンチウム結晶の製造方法 |
| JP5868542B1 (ja) * | 2014-12-12 | 2016-02-24 | 大電株式会社 | 窒化物または酸窒化物を母体とする蛍光体の製造方法、蛍光体、発光素子、及び発光装置 |
Also Published As
| Publication number | Publication date |
|---|---|
| JP5261667B2 (ja) | 2013-08-14 |
| CN101400758A (zh) | 2009-04-01 |
| EP2006348A4 (en) | 2010-05-05 |
| US20090047202A1 (en) | 2009-02-19 |
| CN101400758B (zh) | 2013-07-17 |
| EP2006348A2 (en) | 2008-12-24 |
| JPWO2007105598A1 (ja) | 2009-07-30 |
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