WO2005090516A1 - 近紫外線励起蛍光体とその製造方法 - Google Patents
近紫外線励起蛍光体とその製造方法 Download PDFInfo
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- WO2005090516A1 WO2005090516A1 PCT/JP2005/004594 JP2005004594W WO2005090516A1 WO 2005090516 A1 WO2005090516 A1 WO 2005090516A1 JP 2005004594 W JP2005004594 W JP 2005004594W WO 2005090516 A1 WO2005090516 A1 WO 2005090516A1
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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
- C09K11/7728—Luminescent, e.g. electroluminescent, chemiluminescent materials containing inorganic luminescent materials containing rare earth metals containing europium
- C09K11/7729—Chalcogenides
- C09K11/7731—Chalcogenides with alkaline earth metals
-
- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01G—COMPOUNDS CONTAINING METALS NOT COVERED BY SUBCLASSES C01D OR C01F
- C01G23/00—Compounds of titanium
-
- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01G—COMPOUNDS CONTAINING METALS NOT COVERED BY SUBCLASSES C01D OR C01F
- C01G23/00—Compounds of titanium
- C01G23/003—Titanates
- C01G23/006—Alkaline earth titanates
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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
- C09C—TREATMENT OF INORGANIC MATERIALS, OTHER THAN FIBROUS FILLERS, TO ENHANCE THEIR PIGMENTING OR FILLING PROPERTIES ; PREPARATION OF CARBON BLACK ; PREPARATION OF INORGANIC MATERIALS WHICH ARE NO SINGLE CHEMICAL COMPOUNDS AND WHICH ARE MAINLY USED AS PIGMENTS OR FILLERS
- C09C1/00—Treatment of specific inorganic materials other than fibrous fillers; Preparation of carbon black
- C09C1/36—Compounds of titanium
- C09C1/3607—Titanium dioxide
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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
- C09C—TREATMENT OF INORGANIC MATERIALS, OTHER THAN FIBROUS FILLERS, TO ENHANCE THEIR PIGMENTING OR FILLING PROPERTIES ; PREPARATION OF CARBON BLACK ; PREPARATION OF INORGANIC MATERIALS WHICH ARE NO SINGLE CHEMICAL COMPOUNDS AND WHICH ARE MAINLY USED AS PIGMENTS OR FILLERS
- C09C1/00—Treatment of specific inorganic materials other than fibrous fillers; Preparation of carbon black
- C09C1/36—Compounds of titanium
- C09C1/3607—Titanium dioxide
- C09C1/3653—Treatment with inorganic compounds
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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
- C09K11/7728—Luminescent, e.g. electroluminescent, chemiluminescent materials containing inorganic luminescent materials containing rare earth metals containing europium
- C09K11/7729—Chalcogenides
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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
- C09K11/7728—Luminescent, e.g. electroluminescent, chemiluminescent materials containing inorganic luminescent materials containing rare earth metals containing europium
- C09K11/7729—Chalcogenides
- C09K11/773—Chalcogenides with zinc or cadmium
-
- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01P—INDEXING SCHEME RELATING TO STRUCTURAL AND PHYSICAL ASPECTS OF SOLID INORGANIC COMPOUNDS
- C01P2002/00—Crystal-structural characteristics
- C01P2002/70—Crystal-structural characteristics defined by measured X-ray, neutron or electron diffraction data
- C01P2002/72—Crystal-structural characteristics defined by measured X-ray, neutron or electron diffraction data by d-values or two theta-values, e.g. as X-ray diagram
Definitions
- the invention of this application relates to a near-ultraviolet excitation phosphor and a method for producing the same. More specifically, the invention of this application relates to a novel near-ultraviolet-excited phosphor that emits red light with high luminance and has a long life, and a method for producing the same. Background art
- white LEDs white light-emitting diodes
- a near-ultraviolet excitation source such as YAG: Ce3 + shows blue (wavelength 450 nm) and YAG: Ce + Mn shows yellow (wavelength 580 nm).
- YAG: Ce3 + shows blue (wavelength 450 nm)
- YAG: Ce + Mn shows yellow (wavelength 580 nm).
- R & D of red light-emitting materials is expected because the strength in the red region is still weak and the color development is not sufficient.
- titanium oxide (T i 0 2 ) is a dielectric and insulating substance, It was known that the energy gap, which is a measure of linear absorption, was 3.3 electron volts (corresponding to a wavelength of 378 nm). However, since it is an indirect transition semiconductor, it is considered that it cannot be used as a luminescent material. Was. Among such substances obtained by adding Eu anatase T i 0 2 is, it has been reported that emits light by irradiation with key Senonranpu and X-ray (Non Patent Document 1) is the emission intensity even when the It is small and the material obtained by adding EU rutile T I_ ⁇ 2 has been considered not to substantially emit light.
- Non-Patent Document 1 Ovenstone, J. et al., J. Phys. C em. B 2001,
- T i 0 2 result of extensive studies on synthesis and properties of the added substance E u in, a portion of the T i to T i 0 2 in the crystal structure Instead, they found that a substance incorporating Eu is a near-ultraviolet-excited phosphor that emits red light from a near-ultraviolet light source, and filed a patent application (Japanese Patent Application No. 2003-34550).
- this phosphor also had the drawback that the luminance of red light emission was not always satisfactory, and that the lifetime was not so long.
- the invention of this application has been made in view of the circumstances described above, and solves the problems of the prior art, and emits red light with high luminance, long life, and is useful as a white LED or the like. It is an object of the present invention to provide a near-ultraviolet-excited phosphor and a method for producing the phosphor.
- a composite oxide comprising Ti and any one of Mg, Sr, Zn, Y, and Ca is used. 0.1111% or more and 110111% or less Eu are incorporated in the crystal structure of the substance in place of the Ti in the-part, and are excited by near-ultraviolet light with a wavelength of 360 nm or more and 420 nm or less.
- a near-ultraviolet-excitation phosphor which emits color light.
- the composite oxide has a general formula: MxT i yOz (where 0 ⁇ x ⁇ 2, 0 ⁇ y ⁇ 2, 1 ⁇ z ⁇ 4
- MxT i yOz where 0 ⁇ x ⁇ 2, 0 ⁇ y ⁇ 2, 1 ⁇ z ⁇ 4
- a near-ultraviolet-excited phosphor characterized by the fact that Eu of 1.5mo 1% or more and 3mo 1% or less is incorporated.
- a near-ultraviolet-excited phosphor characterized by
- the invention of this application is based on a solution of a hydrolyzable titanium compound and a solution of a hydrolyzable metal compound of Mg, Sr, Zn, Y, or Ca.
- a gel containing complex metal oxides or hydroxides is formed, europium chloride is added at 0.1 to 1% Omo, 1% or less, dried, and calcined at 850 to 1100.
- a method for producing a near-ultraviolet-excited phosphor is based on a solution of a hydrolyzable titanium compound and a solution of a hydrolyzable metal compound of Mg, Sr, Zn, Y, or Ca.
- the invention of this application is directed to a method for producing a near-ultraviolet-excited phosphor characterized in that the titanium compound is tetraethoxytitanium or titanium chloride in the method of the above invention. Describes a method for producing a near-ultraviolet-excited phosphor characterized in that the metal compound is magnesium chloride or magnesium nitrate, and tenthly, adding 1.5 to 1 mol of europium chloride to 3 mol or less.
- the method of producing the near-ultraviolet-excited phosphor is as follows.
- the present invention also provides a method for producing a near-ultraviolet-excited phosphor characterized in that: Brief Description of Drawings
- FIG. 1 is a diagram exemplifying an ultraviolet-excited emission spectrum of a near-ultraviolet-excitation phosphor of the invention of the present application in an example.
- FIG. 2 is a diagram exemplifying the results of examining the ultraviolet-excited luminescence intensity and the electron-beam-excited luminescence intensity of the near-ultraviolet-excited phosphor of the present invention and the conventional near-ultraviolet-excited phosphor in the examples.
- MgO- T i 0 2 £ 11 is a diagram illustrating an ultraviolet excited light-emitting intensity of 1 ⁇ when changing the ⁇ formulation of.
- MgO- T i 0 2 £ is illustrated Figure the results of X-ray diffraction measurement when changing the formulation of ⁇ 1 3 ⁇ 418.
- MgO_T i 0 2 £ 11 is a diagram illustrating an ultraviolet excited light-emitting scan Bae spectrum when changing the formulation of the £ 11.
- FIG. 6 is a diagram illustrating the emission intensity of the main peak in FIG. 7, in the embodiment, MgO- T i 0 2: £ 11 by changing the formulation of the £ 11, is illustrated FIG excitation scan Bae spectrum when the emission wavelength of 617 nm was monitored wavelength.
- FIG. 8 is a diagram exemplifying a change over time in luminance of the near-ultraviolet excitation phosphor of the invention of the present application and a conventional near-ultraviolet excitation phosphor during electron beam irradiation in the embodiment.
- Eu In the crystal structure of the composite oxide composed of any one of the metal elements M, Eu of 0.1 to 1% or less and 1 Omo or less of 1% is incorporated in place of Ti in the-part, and the wavelength is 300 nm. that's all It emits red light when excited by near-ultraviolet light of 420 nm or less.
- the composite oxide composed of titanium Ti and metal element M is mainly represented by the general formula, MxT i yOz (where 0 ⁇ x ⁇ 2, 0 ⁇ y ⁇ 2, 1 ⁇ z ⁇ 4). It is considered to be a substance having a typical composition, and is composed of various phases of oxides of titanium T i and metal element M.
- any one of Mg, Sr, Zn, Y, and Ca can be considered as the metal element M.
- the metal element M is Mg or Sr Is shown as a more preferable example.
- the metal element M is Mg or Sr, more preferably when it is Mg, it emits better red light (for example, a peak wavelength of 617 nm) by near-ultraviolet light having a wavelength of 360 nm to 420 nm. I can do it.
- T i: M 1: 0.2 to about 5 and 1: 0.5 to 2.
- the effect can be obtained by adding a very small amount of the metal element M, but if it is smaller than 0.2, the near-ultraviolet-excited phosphor already proposed by the inventors (Japanese Patent Application No. -343550) is not preferable because only a near-ultraviolet-excited phosphor having the same or slightly higher luminance can be obtained. In the case of 0.2 or more, a sufficiently high-intensity near-ultraviolet-excited phosphor can be obtained.
- the case where the ratio of the metal element M is larger than 5 is not preferable because sufficient luminance cannot be obtained.
- the near-ultraviolet-excited phosphor of the invention of the present application also has a long lifespan capable of maintaining high-luminance light emission for a long time.
- the near-ultraviolet-excited phosphor of the invention of this application has a high possibility of being used for near-ultraviolet LEDs used as a phosphor excitation light source. It is expected to be applied to lighting sources.
- red emission is defined as emission of trivalent europium (Eu 3+ ). It is known that Eu3 + has three transitions in the range of 595 to 630 nm, and which transition becomes stronger depends on the base composite oxide (crystal field). Will be.
- the near-ultraviolet excitation phosphor of the invention of the present application as described above can be manufactured by the following method of the invention of the present application. That is, the method for producing a near-ultraviolet-excited phosphor provided by the invention of this application includes a hydrolyzable titanium compound and a hydrolyzable Mg, Sr, Zn, Y, and Ca. Form a gel containing a composite metal oxide or hydroxide from a solution of any of the metal compounds described in (1) and (2) .Add europium chloride (0.1% or more and 1 Omo 1% or less), and then dry. It is characterized in that it is fired at 110 in the following.
- Hydrolytic titanium compounds as starting materials include, for example, metal organic compounds such as titanium alkoxide, titanium oxalate, Titanium nitrate, titanium chloride (titanium tetrachloride), and the like can be used as the metal-inorganic compound. Among them, titanium chloride and titanium alkoxide are preferably used. As the titanium alkoxide, for example, various compounds represented by the general formula Ti (OR) 4 can be used.
- Examples of the organic group R constituting the alkoxyl group include the same or different lower alkyl groups having 1 to 6 carbon atoms, such as a methyl group, an ethyl group, a propyl group, an isopropyl group, a butyl group, and an isobutyl group. . More specifically, for example, tetramethoxytitanium, tetraethoxytitanium, tetra-n-propoxytitanium, tetraisopropoxytitanium, tetra-n-butoxytitanium, tetraisobutoxytitanium, and the like are mentioned. Laethoxy titanium.
- a metal compound of any of Mg, Sr, Zn, Y, and Ca having hydrolyzability as a starting material various salts such as chlorides and nitrates of these metal elements are used. be able to.
- the use of magnesium chloride or magnesium nitrate as a metal compound is shown as a preferred example.
- titanium alkoxide these starting materials are dissolved in an organic solvent to prepare a solution.
- a catalyst for promoting hydrolysis of an alkoxy group or a dehydration condensation reaction and water may be added.
- organic solvents include methanol, ethanol, 1-propanol, isopropyl alcohol, 1-butanol, 2-butanol, isobutyl alcohol, ter-butyl alcohol, 1-pentanol, 2-pentanol, 3- Pennol can be cited.
- Catalysts include, for example, nitric acid, hydrochloric acid, sulfuric acid, phosphorus Examples thereof include acids, acetic acid, and ammonia.
- a solution is prepared by dissolving in a base such as aqueous ammonia or sodium hydroxide, or the above-mentioned organic solvent. Then, these solutions are mixed to form a gel containing the composite metal oxide or hydroxide.
- a base such as aqueous ammonia or sodium hydroxide, or the above-mentioned organic solvent.
- europium chloride is added in an amount of 0.1% to 1% of Omo 1% or less based on the whole amount, dried, and baked at 850 to 110%.
- europium chloride it is preferable to add 1.5 mol 1% or more and 3 mol 1% or less for the above reason.
- the firing temperature is lower than 850, the crystallinity is poor and stability (life) is disadvantageously increased.
- Eu which is the luminescent center
- the base is a metal composite oxide, the amount of Eu taken in during high-temperature firing in the temperature range of 850 to 110 0 can be increased. It can improve the crystallinity and stability.
- the manufacturing method of the invention of the present application is a method with good reproducibility and easy to scale up, and a near-ultraviolet-excited phosphor can be industrially manufactured.
- Example 1 A compound of tetraethoxytitanium and a hydrolyzable metal element M is dissolved and mixed in ethanol, and after adding europium chloride, the mixture is dried, and calcined in air at 1000 for 3 hours to obtain europium. a composite oxide of titanium and the metal element M containing (MO_T i 0 2: Eu) was created. Note that Mg, Sr, and Zn were selected as the metal elements M, and magnesium chloride, strontium nitrate, and zinc chloride were used as the compounds thereof, respectively. In addition, the composition was such that the ratio of the metal element M was 1 molar ratio with respect to Ti, and that europium chloride was 2 mo 1% with respect to the total amount of the composite oxide.
- the ultraviolet excitation-emission spectrum of the obtained three types of composite oxides was measured, and the results are shown in FIG.
- the excitation wavelength was 325 nm.
- the metal element M those using Mg exhibited strong emission with a main peak at 615 nm, those using Sr at 595 nm, and those using Zn near those wavelengths. A relatively weak emission with a broad peak was observed.
- the UV-excited emission spectrum was measured in the same manner, and a relatively weak luminescence was observed, which was very similar to the case where Zn was used.
- T i 0 2 It is highly significant luminance than Eu was confirmed. In particular, for the composite oxide (a) of Mg and Ti, red high-luminance emission was observed.
- the metal element M is magnesium, alter its formulation, later under the same conditions as in Example 1, a composite oxide of T i and Mg containing europium (MgO -T i 0 2: E u) was created.
- Mg was used in six molar ratios of 0.1, 0.2, 0.5, 1, 2, and 5 with respect to Ti.
- the UV-excited emission spectrum of the six types of composite oxides obtained was measured, and the results are shown in FIG.
- the excitation wavelength was 325 nm.
- T i 0 as shown in FIG. 2 2: Eu (R) than the emission intensity is high in the large width has been confirmed.
- the complex oxide having a ratio of 8: 1 to 1: 1 emits light with the highest luminance.
- Titanium chloride and magnesium nitrate are dissolved and mixed in ethanol, and europium chloride is added in proportions of 1, 2, 4, 7, and 10 mol%, and then dried, and dried in air at 1000 at 3 and fired in time, the composite oxide of T i and Mg containing europium (Mg- T i 0 2: Eu ) was created.
- the resulting Mg- T i 0 2 measuring the ultraviolet excitation-emission scan Bae spectrum of E u, showed the spectrum diagram in FIG. It was confirmed that red emission having a main peak at 617 nm was obtained at all Eu ratios. It was.
- FIG. 6 shows the peak intensities of these spectra at 617 nm.
- Eu is lmo 1%
- the luminance is relatively low, and in the range of 2 to 10mo 1%, there is no significant change in luminance, and it is understood that a substantially constant luminance can be obtained within this range. .
- the excitation spectrum was measured when the wavelength of 617 nm was used as the monitor wavelength, and the results are shown in FIG. Large peaks were observed at 380 nm and 395 nm, and it was confirmed that they were excited by near ultraviolet light near 360 to 420 nm.
- the ratio of Mg and T i is 1: 1 MgO-T i 0 2: Eu and T i 0 2:
- E u measures the change in luminance with time when the electron beam irradiation, and the results are shown in FIG. 8 Was.
- Eu was added at 1 mo 1% to the whole.
- FIG. 8 shows a relative brightness change of when the initial luminance is 1.
- T i 0 2: Eu compared to after the irradiation with the electron beam 5 hours was reduced to about 2 0% brightness
- MgO- T i 0 2: E u maintained a brightness of about 80% .
- MgO—Ti 0 2 : Eu can be used in UV irradiation as well as in electron beam irradiation. It is considered to be excellent in durability.
- the present invention provides a novel near-ultraviolet-excited phosphor that emits red light with high luminance and has a long life, and a method for producing the same.
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Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
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WO2006135104A1 (ja) * | 2005-06-17 | 2006-12-21 | National Institute For Materials Science | 希土類元素がドープされた二酸化チタン粒子およびその製造方法 |
Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH0885788A (ja) * | 1994-09-16 | 1996-04-02 | Futaba Corp | 蛍光体 |
JPH11263970A (ja) * | 1997-11-28 | 1999-09-28 | Agency Of Ind Science & Technol | 発光材料、その製造方法及びそれを用いた発光方法 |
JP2004238549A (ja) * | 2003-02-07 | 2004-08-26 | Noritake Itron Corp | 低速電子線用蛍光体および蛍光表示管 |
JP2005008674A (ja) * | 2003-06-16 | 2005-01-13 | Noritake Co Ltd | 蛍光体および蛍光表示装置 |
-
2005
- 2005-03-09 JP JP2006511194A patent/JPWO2005090516A1/ja active Pending
- 2005-03-09 WO PCT/JP2005/004594 patent/WO2005090516A1/ja active Application Filing
Patent Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH0885788A (ja) * | 1994-09-16 | 1996-04-02 | Futaba Corp | 蛍光体 |
JPH11263970A (ja) * | 1997-11-28 | 1999-09-28 | Agency Of Ind Science & Technol | 発光材料、その製造方法及びそれを用いた発光方法 |
JP2004238549A (ja) * | 2003-02-07 | 2004-08-26 | Noritake Itron Corp | 低速電子線用蛍光体および蛍光表示管 |
JP2005008674A (ja) * | 2003-06-16 | 2005-01-13 | Noritake Co Ltd | 蛍光体および蛍光表示装置 |
Non-Patent Citations (2)
Title |
---|
LIN Y. ET AL: "Anomalous afterglow from Y203-based phosphor.", JOURNAL OF ALLOYS AND COMPOUNDS., vol. 361, no. 1-2, 2003, pages 92 - 95, XP004463561 * |
OVENSTONE J. ET AL: "A Study of the Effects of Europium Doping and Calcination on the Luminiscence of Titania Phosphor Materials.", J.PHYS.CHEM.B., vol. 105, 2001, pages 7170 - 7177, XP002989552 * |
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2006135104A1 (ja) * | 2005-06-17 | 2006-12-21 | National Institute For Materials Science | 希土類元素がドープされた二酸化チタン粒子およびその製造方法 |
JP2006347826A (ja) * | 2005-06-17 | 2006-12-28 | National Institute For Materials Science | 希土類元素がドープされた二酸化チタン粒子およびその製造方法 |
US8062621B2 (en) | 2005-06-17 | 2011-11-22 | National Institute For Materials Science | Method of manufacturing titanium dioxide particles doped with rare earth element |
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