WO2008146865A1 - 紫外線発光六方晶窒化ホウ素結晶体の製造方法 - Google Patents
紫外線発光六方晶窒化ホウ素結晶体の製造方法 Download PDFInfo
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- C—CHEMISTRY; METALLURGY
- C30—CRYSTAL GROWTH
- C30B—SINGLE-CRYSTAL GROWTH; UNIDIRECTIONAL SOLIDIFICATION OF EUTECTIC MATERIAL OR UNIDIRECTIONAL DEMIXING OF EUTECTOID MATERIAL; REFINING BY ZONE-MELTING OF MATERIAL; PRODUCTION OF A HOMOGENEOUS POLYCRYSTALLINE MATERIAL WITH DEFINED STRUCTURE; SINGLE CRYSTALS OR HOMOGENEOUS POLYCRYSTALLINE MATERIAL WITH DEFINED STRUCTURE; AFTER-TREATMENT OF SINGLE CRYSTALS OR A HOMOGENEOUS POLYCRYSTALLINE MATERIAL WITH DEFINED STRUCTURE; APPARATUS THEREFOR
- C30B9/00—Single-crystal growth from melt solutions using molten solvents
- C30B9/04—Single-crystal growth from melt solutions using molten solvents by cooling of the solution
- C30B9/08—Single-crystal growth from melt solutions using molten solvents by cooling of the solution using other solvents
- C30B9/10—Metal solvents
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- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01B—NON-METALLIC ELEMENTS; COMPOUNDS THEREOF; METALLOIDS OR COMPOUNDS THEREOF NOT COVERED BY SUBCLASS C01C
- C01B21/00—Nitrogen; Compounds thereof
- C01B21/06—Binary compounds of nitrogen with metals, with silicon, or with boron, or with carbon, i.e. nitrides; Compounds of nitrogen with more than one metal, silicon or boron
- C01B21/064—Binary compounds of nitrogen with metals, with silicon, or with boron, or with carbon, i.e. nitrides; Compounds of nitrogen with more than one metal, silicon or boron with boron
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- C—CHEMISTRY; METALLURGY
- C30—CRYSTAL GROWTH
- C30B—SINGLE-CRYSTAL GROWTH; UNIDIRECTIONAL SOLIDIFICATION OF EUTECTIC MATERIAL OR UNIDIRECTIONAL DEMIXING OF EUTECTOID MATERIAL; REFINING BY ZONE-MELTING OF MATERIAL; PRODUCTION OF A HOMOGENEOUS POLYCRYSTALLINE MATERIAL WITH DEFINED STRUCTURE; SINGLE CRYSTALS OR HOMOGENEOUS POLYCRYSTALLINE MATERIAL WITH DEFINED STRUCTURE; AFTER-TREATMENT OF SINGLE CRYSTALS OR A HOMOGENEOUS POLYCRYSTALLINE MATERIAL WITH DEFINED STRUCTURE; APPARATUS THEREFOR
- C30B19/00—Liquid-phase epitaxial-layer growth
- C30B19/02—Liquid-phase epitaxial-layer growth using molten solvents, e.g. flux
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- C—CHEMISTRY; METALLURGY
- C30—CRYSTAL GROWTH
- C30B—SINGLE-CRYSTAL GROWTH; UNIDIRECTIONAL SOLIDIFICATION OF EUTECTIC MATERIAL OR UNIDIRECTIONAL DEMIXING OF EUTECTOID MATERIAL; REFINING BY ZONE-MELTING OF MATERIAL; PRODUCTION OF A HOMOGENEOUS POLYCRYSTALLINE MATERIAL WITH DEFINED STRUCTURE; SINGLE CRYSTALS OR HOMOGENEOUS POLYCRYSTALLINE MATERIAL WITH DEFINED STRUCTURE; AFTER-TREATMENT OF SINGLE CRYSTALS OR A HOMOGENEOUS POLYCRYSTALLINE MATERIAL WITH DEFINED STRUCTURE; APPARATUS THEREFOR
- C30B29/00—Single crystals or homogeneous polycrystalline material with defined structure characterised by the material or by their shape
- C30B29/10—Inorganic compounds or compositions
- C30B29/38—Nitrides
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- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01P—INDEXING SCHEME RELATING TO STRUCTURAL AND PHYSICAL ASPECTS OF SOLID INORGANIC COMPOUNDS
- C01P2004/00—Particle morphology
- C01P2004/01—Particle morphology depicted by an image
- C01P2004/02—Particle morphology depicted by an image obtained by optical microscopy
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- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01P—INDEXING SCHEME RELATING TO STRUCTURAL AND PHYSICAL ASPECTS OF SOLID INORGANIC COMPOUNDS
- C01P2004/00—Particle morphology
- C01P2004/01—Particle morphology depicted by an image
- C01P2004/03—Particle morphology depicted by an image obtained by SEM
Definitions
- the present invention relates to a method for producing a hexagonal boron nitride crystal, and in particular, a hexagonal boron nitride crystal that emits ultraviolet light in a wavelength range of 2 10 to 2300 nm. It relates to the manufacturing method.
- c BN cubic boron nitride
- h hexagonal boron nitride
- c BN cubic boron nitride
- h hexagonal boron nitride
- High-purity hBN single crystals are obtained by recrystallizing high-purity alkali metal and alkaline earth metal (such as barium and lithium) nitrides and their boronitrides using boron nitride as a raw material. It has high-intensity ultraviolet emission near 2 15 nm. In this method, it is important to improve the atmosphere under the synthesis conditions and the solvent to be used, but alkali metals and alkaline earth metal boronitrides used as the solvent are easily mixed with moisture and oxygen. It is difficult to handle because it reacts, and it is necessary to synthesize it in a container sealed under high pressure and high temperature to suppress decomposition and oxidation of the solvent.
- alkali metal and alkaline earth metal such as barium and lithium
- the role of the growth solvent in the synthesis of Balta crystals by the solvent method is to promote the crystallization of the raw material when the raw material, which is a solute, is dissolved at a high temperature and reprecipitated in a low temperature region. Selection is an extremely important research topic in order to promote the high purity, low defect, or high efficiency of the synthesis process.
- the present inventors do not rely on the high-purity alkali metal, but the high-purity hBN single crystal is a transition metal solvent such as nickel, more specifically, an Ni-Mo alloy. (For example, Patent Document 2 and non-patent) (Ref. 2).
- transition metal solvents are stable even at 1 atm, it has become possible to synthesize high-purity hBN, which previously required a high-pressure method, by recrystallization from the solvent at 1 atm.
- the hBN crystal obtained by the above method is a thin film, and its handling is extremely difficult.
- hBN is a layered compound and has the disadvantage that it can easily introduce stacking faults due to mechanical deformation.
- the solubility of boron forming BN was relatively high in Ni solvent, but the solubility of nitrogen was low. The reason why high-quality crystals are obtained in the Ni_Mo-based solvent is thought to be due to the effect of improving the solubility of nitrogen by adding Mo to Ni (for example, see Non-Patent Document 3).
- Patent Document 1 Japanese Patent Laid-Open No. 2005-145788
- Patent Document 2 JP 2008-007388 A
- Non-Patent Document 1 K. Wa tanabe, T. Ta niguchiand H. K anda, Nature Materials, 3, 404 (2004)
- Non-Patent Document 2 Y. Ku bota, T. Ta niguchi, K. Wa tanabe, 46, 31 1 (2007)
- Non-Patent Document 3 C. Kowanda, MO S peidel, Scripta Materiali a. 48, 107.3 (2003) Disclosure of the invention
- the second object of the present invention is to provide a crystal film having a sufficient thickness even if it has a laminated structure, so that the handling becomes easy, that is, h BN having a thickness that is easy to handle. It is to provide a method for synthesizing crystals.
- the method for producing a hexagonal boron nitride crystal of Invention 1 includes a preparation step of preparing a mixture of a boron nitride raw material and a metal solvent composed of a transition metal, and contact for bringing the sapphire substrate into contact with the mixture It is characterized by comprising a step, a heating step for heating the mixture, and a recrystallization step for recrystallizing the melt obtained by the heating step at normal pressure.
- Invention 2 is characterized in that, in the method of Invention 1, the hexagonal boron nitride crystal emits ultraviolet light in a wavelength range of 210 to 2300 nm.
- Invention 3 is the method of Invention 1, wherein the metal solvent is selected from the group consisting of Fe, Ni, Co, and combinations thereof.
- the method for producing a hexagonal boron nitride crystal of the invention 4 is a preparation step of preparing a mixture of a boron nitride raw material and a metal solvent composed of a transition metal, the metal solvent Includes a transition metal selected from the group consisting of Fe, Ni, Co, and combinations thereof, and a material selected from at least one selected from the group consisting of Cr, TiN and V. It is characterized by comprising a preparation step, a heating step for heating the mixture, and a recrystallization step for recrystallizing the melt obtained by the heating step at normal pressure.
- Invention 5 is characterized in that, in the method of Invention 4, the hexagonal boron nitride crystal emits ultraviolet light in a wavelength range of 2 10 to 2 30 nm.
- Invention 6 is characterized in that in the method of Invention 3 or 4, the metal solvent further contains Mo.
- Invention 7 is characterized in that, in the method described in Invention 1 or 4, the boron nitride raw material is hexagonal boron nitride.
- Invention 8 is characterized in that, in the method according to Invention 1 or 4, a step of deoxidizing the boron nitride raw material is arranged before the preparation step.
- Invention 9 is the method according to Invention 1 or 4, characterized in that the heating step heats to a temperature equal to or higher than the eutectic point of the boron nitride raw material and the metal solvent.
- Invention 10 is characterized in that, in the method according to Invention 1 or 4, the heating step and the recrystallization step are performed in an inert atmosphere.
- Invention 11 is characterized in that, in the method according to Invention 1 or 4, the recrystallization step is either cooling the melt or providing a temperature gradient in the melt. To do.
- Invention 12 is characterized in that, in the method according to Invention 1 or 4, the step of removing the metal solvent using a solution containing hydrochloric acid and nitric acid is arranged after the recrystallization step.
- Effect of the Invention according to the method of the present invention 1, hexagonal nitridation on a sapphire substrate that easily exhibits high-luminance light emission in the vicinity of a wavelength of 2 15 nm under normal pressure without using an expensive and special apparatus. Boron crystals can be supplied.
- the resulting crystals According to the method of the present invention 4, which is easy to handle the body, an expensive and special apparatus is used by using at least one substance selected from the group consisting of Cr, Ti N and V as a solvent.
- FIG. 1 is a flowchart showing a process for producing a high-purity hBN single crystal according to Embodiment 1 of the present invention.
- FIG. 2 is a flow chart showing a process for producing a high-purity hBN single crystal according to Embodiment 2 of the present invention.
- FIG. 3 is a diagram showing the results of optical microscope observation according to Example 1.
- FIG. 3 is a diagram showing the results of optical microscope observation according to Example 1.
- FIG. 8 is a diagram showing a force-sword luminescence spectrum according to Example 3.
- FIG. 9 is a diagram showing the results of optical microscope observation according to Example 4.
- FIG. 10 is a diagram showing the results of optical microscope observation according to Example 5.
- FIG. 12 is a diagram showing a force-sword luminescence spectrum according to Example 6.
- FIG. 13 is a diagram showing the results of optical microscope observation according to Example 7.
- FIG. 14 is a diagram showing a force-sword luminescence spectrum according to Example 7.
- FIG. 14 is a diagram showing a force-sword luminescence spectrum according to Example 7.
- FIG. 16 is a diagram showing the results of optical microscope observation according to Example 9. BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below with reference to the drawings. Note that the same number is assigned to the same element, and the description thereof is omitted.
- FIG. 1 is a flowchart showing a process for producing a high-purity hBN single crystal according to Embodiment 1 of the present invention.
- the present invention relates to a high-purity hBN single crystal that emits ultraviolet light in a short wavelength region and a synthesis process thereof.
- a transition metal or an alloy thereof is used as a solvent to recrystallize hBN from a molten solution.
- a high-purity hBN single crystal that emits ultraviolet light is obtained.
- Step S 1 10 A mixture of a boron nitride raw material and a metal solvent composed of a transition metal is prepared.
- the boron nitride raw material is arbitrary as long as it is a substance capable of supplying boron nitride to the metal solvent, and the form and shape of the powder or the sintered body are not limited. It goes without saying that the higher the purity of the boron nitride raw material, the higher the purity of the produced hBN crystal, but preferably the purity of the boron nitride raw material is 99.9% or higher. If a boron nitride raw material having a purity of 99.9% or more is used, the produced hBN crystal can be reliably used as a light emitting material.
- hBN which is the same crystal system as the hBN crystal to be produced
- boron nitride raw material because recrystallization is likely to occur.
- the boron nitride raw material is previously subjected to deoxygenation treatment. Thereby, impurities such as oxygen can be further reduced.
- the deoxygenation treatment is performed by heating in a vacuum and an inert atmosphere.
- Deoxygenation treatment is performed, for example, in a vacuum at 1 3 X 10 2 ° C or higher for a temperature range of 15 X 10 2 ° C or lower for 1 hour or longer, and then in an inert atmosphere at 15 X 10 0 2 ° C or higher Although it is performed for 1 hour or more in a temperature range of 25 X 10 2 ° C or less, the above conditions are only examples.
- the solvent is a transition metal selected from the group consisting of Fe, Ni, Co, and combinations thereof.
- the solvent preferably further comprises Mo. In order to obtain high-quality crystals, it is necessary to ensure sufficient solubility in the solute (here, boron and nitrogen forming boron nitride).
- the amount of the fluorine nitride raw material and the transition metal metal solvent in the mixture need only be able to be supplied to the metal solvent so that supersaturation is always maintained during crystal growth, and can be set according to the crystal synthesis conditions. Good.
- the “mixture” means not only a state in which the boron nitride raw material and the solvent are completely mixed, but also a state in which the boron nitride raw material and the solvent are simply laminated. There are no limitations on the method of filling the container such as mixing and lamination of the raw material and the solvent.
- Step S 1 2 0 A safia substrate is brought into contact with the mixture prepared in Step S 1 1 0.
- the container is filled with the mixture, and the sapphire substrate is placed thereon.
- a container that does not react with the molten solvent may be selected. However, if a container made of fluorine nitride is used, impurities can be prevented from entering from the container, and at the same time, raw materials can be supplied.
- the mixture can be filled into the container regardless of pressure and atmosphere. If you can avoid atmospheric pressure 'atmosphere.
- the sapphire substrate may be arranged in any manner as long as it is in contact with the solvent in the molten state of the metal solvent. Step S 1 3 0: Heat the mixture.
- the temperature condition only needs to be equal to or higher than the eutectic point of boron nitride and the metal solvent, and may be set according to the type of solvent.
- the solvent melts and the boron nitride raw material dissolves in the solvent.
- the heating time is not particularly limited, but the mixture can be reliably melted by heating and holding at a temperature equal to or higher than the eutectic point for 4 hours or more. There is no upper limit for the heating time, but considering the manufacturing cost and manufacturing time, it is preferably 4 hours or more and 24 hours or less. Heating is preferably performed in an inert atmosphere in order to reduce contamination of impurities such as oxygen.
- Step S 1 4 0 The melt obtained in Step S 1 3 0 is recrystallized at normal pressure.
- the inventors of the present application have found by creative ideas that an hBN single crystal is produced under normal pressure even on a sapphire substrate placed in step S 1 30.
- recrystallization at normal pressure is performed without using a dedicated device such as a high-pressure vessel or a high-pressure generator. For this reason, since it does not depend on the size of the dedicated device, a large-area Z-sized hBN crystal can be obtained.
- the cooling of the melt is performed by cooling a solvent in which boron nitride is dissolved at a high temperature to a room temperature using a heating device such as a heater.
- the temperature gradient is imparted by imparting a temperature gradient to the melt and supersaturating boron nitride in the melt located in the low temperature part.
- This is preferably performed in an inert atmosphere in order to reduce the mixing of impurities such as oxygen. Note that a step of removing excess metal solvent may be further included following the step S1440.
- FIG. 2 is a flowchart showing a process for producing a high purity hBN crystal according to Embodiment 2 of the present invention.
- Step S 2 10 Mixture containing boron nitride raw material and metal solvent composed of transition metal To prepare.
- the solvent is a transition metal selected from the group consisting of Fe, Ni, Co, and combinations thereof, and a substance selected from at least one selected from the group consisting of Cr, TiN and V including.
- it is expected that the solubility of nitrogen will be further improved by containing at least one substance selected from the group consisting of Cr, TiN and V in the solvent.
- the crystal growth rate can be further improved compared to the case where a Ni-Mo solvent is used. I knew I could do it.
- the solvent further comprises Mo in addition to the transition metal and at least one substance selected from the group consisting of Cr, Ti N and V.
- the solubility of boron and nitrogen can be further improved, and high-quality crystals are easily obtained.
- the effects described above are expected even when multiple combinations such as simultaneous addition of Cr and TiN and simultaneous addition of Cr and V are performed.
- the source material of the nitrided nitrogen, the shape of the solvent, and the like are the same as those in step S 110 described with reference to FIG.
- Step S 2 20 Heat the mixture.
- Step S 2 3 0 The melt obtained in step S 2 2 0 is recrystallized at normal pressure.
- steps S 2 2 0 and S 2 30 are the same as steps S 1 3 0 and S 1 4 0 described in detail with reference to FIG.
- the inventors of the present application have a thick film (for example, 40 / zm or more). h We found that BN can be manufactured.
- Embodiment 2 of the present invention dissolves boron nitride using a substance selected from the group consisting of C.
- Example 1 As a raw material, hexagonal boron nitride (particle size: about 0.5 / zm) subjected to deoxidation treatment by heat treatment at 1500 ° C in a vacuum and 2000 ° C in a nitrogen stream was used. As the metal solvent, granular Ni—Co—Fe alloy (composition ratio 31: 5: 64 (weight ratio)) was used. The vessel made of hBN sintered body was filled with the raw material and the solvent so that the weight ratio was 1:10 (step S110 in Fig. 1), and the sapphire substrate was placed on the solvent (step S120 in Fig. 1). ). Preparation of these solvents and sample filling were all performed in the atmosphere.
- FIG. 3 is a diagram showing the results of optical microscope observation according to Example 1.
- FIG. 4 is a diagram showing a force-sword luminescence spectrum according to Example 1.
- FIG. 4 ultraviolet luminescence was observed in the region of wavelengths 210 to 230 nm and 300 to 400 nm at room temperature in force sword luminescence observation. This indicates that h BN crystals can be grown on a sapphire substrate with a Ni—Co _Fe alloy solvent, and that h BN band edge emission near a wavelength of 215 nm is emitted. At the same time, however, luminescence that was presumed to originate from defects in 300-400 nm hBN was also observed.
- Example 2 As a raw material, hexagonal boron nitride (particle size: about 0.5 / zm) subjected to deoxidation treatment by heat treatment at 1500 ° C in a vacuum and 2000 ° C in a nitrogen stream was used.
- the metal solvent a block-shaped Ni—Mo alloy having a composition ratio of 1: 1 was used (step S 110 in FIG. 1).
- a container made of hBN sintered body was filled with the raw material and the solvent in a weight ratio of 1:10, and a sapphire substrate was placed on the solvent (step S120 in FIG. 1). All of these solvent preparations and sample fillings were performed in air. After melting the metal solvent using a resistance heating furnace (step S130 in Fig.
- FIG. 5 is a diagram showing the results of optical microscope observation according to Example 2.
- FIG. Figure 5 clearly shows that colorless and transparent crystals were obtained on the sapphire substrate.
- FIG. Fig. 6 is a diagram showing a force-sword luminescence spectrum according to Example 2.
- FIG. Fig. 6 shows a clear emission peak in the wavelength range of 210 nm to 230 nm. In particular, ultraviolet emission having the highest intensity at a wavelength of 215 nm was observed at room temperature.
- Mo molecular weight
- Example 3 As a raw material, hexagonal boron nitride (particle size: about 0.5 ⁇ ) subjected to deoxidation treatment by heat treatment at 1500 ° C. in a vacuum and 2000 ° C. in a nitrogen stream was used.
- the metal solvent As the metal solvent, a block-shaped Ni—Cr alloy having a Ni weight ratio of 47% was used. A container made of hBN sintered compact was filled with the raw material and solvent so that the weight ratio was 1:10 (step S210 in Fig. 2). All of these solvent preparations and sample fillings were performed in air. After melting the metal solvent using a resistance heating furnace (step S220 in Fig. 2), gradually cool down As a result, a crystal was synthesized (step S 230 in FIG.
- FIG. 7 is a diagram showing the results of optical microscope observation according to Example 3. Figure 7 clearly shows that colorless, transparent crystals were obtained. The thickness was about 40 / m, and it was confirmed that the size was easy to handle.
- FIG. 7 is a diagram showing the results of optical microscope observation according to Example 3. Figure 7 clearly shows that colorless, transparent crystals were obtained. The thickness was about 40 / m, and it was confirmed that the size was easy to handle.
- FIG. Fig. 8 is a diagram showing a force sword luminescence spectrum according to Example 3.
- FIG. Fig. 8 shows a clear emission peak in the wavelength range of 210 nm to 230 nm.
- ultraviolet emission having the highest intensity at a wavelength of 215 nm was observed at room temperature. It was found that a high-purity hBN crystal having a thickness that is easy to handle and capable of self-supporting can be obtained without using a sapphire substrate.
- Example 4 As a raw material, hexagonal boron nitride (particle size: about 0.5 / m) subjected to deoxidation treatment by heat treatment at 1500 ° C in a vacuum and 2000 ° C in a nitrogen stream was used.
- the metal solvent As the metal solvent, a block-shaped Ni—Cr alloy with a Ni weight ratio of 47% and a flake-shaped Ni—Mo alloy with a composition ratio of 1: 1 are used, and the weight ratio is 1: 1.
- a mixture was used so that h A container made of BN sintered body was filled with raw material and solvent so that the weight ratio was 1:20 (step S210 in FIG. 2). The preparation of these solvents and the filling of the samples were all carried out in the atmosphere.
- Example 5 As a raw material, hexagonal boron nitride (particle size: about 0.5 ⁇ ) subjected to deoxidation treatment by heat treatment at 1500 ° C. in a vacuum and 2000 ° C. in a nitrogen stream was used.
- a container made of an hBN sintered body was filled with a raw material and a solvent in a weight ratio of 1:20 (step S210 in FIG. 2). All of these solvents were prepared and samples were filled in the atmosphere.
- step S 230 in FIG. 2 After melting the metal solvent using a resistance heating furnace (step S 220 in FIG. 2), the crystal was synthesized by slow cooling (step S 230 in FIG. 2).
- the synthesis conditions were as follows: the temperature was increased to 250 ° CZ at 1450 ° C, held for 4 hours, cooled to 1280 ° C at 5 ° C, and then allowed to cool to room temperature.
- the obtained crystals were observed with an optical microscope (Fig. 10).
- FIG. 10 is a diagram showing the results of optical microscope observation according to Example 5.
- FIG. 10 clearly shows that colorless and transparent crystals were obtained.
- the obtained hBN crystal had a size that was easy to handle (thickness of 40 ⁇ or more).
- Example 6 As a raw material, hexagonal boron nitride (particle size: about 0.5 ⁇ ) subjected to deoxidation treatment by heat treatment at 1500 ° C. in a vacuum and 2000 ° C. in a nitrogen stream was used.
- the metal solvent includes a granular Ni_C ⁇ —Fe alloy (composition ratio 31: 5: 64 (weight ratio)) and a massive Co—Cr alloy with a weight ratio of Co of 59%. A mixture in which the weight ratio was 6: 7 was used.
- a container made of hBN sintered compact was filled with the raw material and solvent so that the weight ratio was 1:20 (step S210 in Fig. 2). All of these solvents were prepared and samples were filled in the atmosphere.
- step S 220 in FIG. 2 After melting the metal solvent using a resistance heating furnace (step S 220 in FIG. 2), the crystal was synthesized by slow cooling (step S 230 in FIG. 2).
- the synthesis conditions were as follows: heating rate 2 Heated to 1400 ° C at about 250 ° CZ, held for 4 hours, cooled to 1280 ° C at about 4 ° CZ, and then allowed to cool to room temperature.
- the obtained crystals were observed with an optical microscope (Fig. 11), and optical characteristics were evaluated (Fig. 12) by force sword luminescence observation.
- FIG. 11 is a diagram showing the results of optical microscope observation according to Example 6. Figure 11 clearly shows that colorless and transparent crystals were obtained.
- FIG. 12 is a diagram showing a force-sword luminescence spectrum according to Example 6.
- Figure 12 shows a wavelength of 210 ⁇ ! A clear emission peak was observed in the region of ⁇ 230 nm, and in particular, ultraviolet emission with the highest intensity at a wavelength of 215 nm was observed at room temperature. It was found that a high-purity hBN crystal that is easy to handle and capable of self-supporting can be obtained without using a sapphire substrate.
- Example 7 The raw material used was hexagonal boron nitride (particle size: about 0.5 / xm) that had been deoxidized by heat treatment at 1500 ° C in a vacuum and 2000 ° C in a nitrogen stream. .
- As the metal solvent a block-shaped Ni—Mo alloy having a composition ratio of 1: 1 and 2% by weight of TiN powder added thereto was used.
- h A container made of BN sintered body was filled with raw materials and solvent so that the weight ratio was 1:20 (step S210 in Fig. 2). All of these solvent preparations and sample fillings were performed in air. After melting the metal solvent using a resistance heating furnace (step S 220 in FIG.
- FIG. 13 is a diagram showing the results of optical microscope observation according to Example 7.
- FIG. 14 is a diagram showing a force-sword luminescence spectrum according to Example 7.
- FIG. 14 shows a clear emission peak in the wavelength region of 210 nm to 230 nm, and in particular, ultraviolet emission having the highest intensity at a wavelength of 215 nm was observed at room temperature. From Example 7, even when Ti N is used instead of Cr, a high-purity hB N crystal having a thickness that is easy to handle and that can stand by itself is obtained without using a sapphire substrate. I understood that.
- Example 8 As a raw material, hexagonal boron nitride (particle size: about 0.5 mm) subjected to deoxidation treatment by heat treatment at 1 500 ° C in a vacuum and 2000 ° C in a nitrogen stream was used.
- As the metal solvent a flaky Ni 1 V alloy having a Ni weight ratio of 53% was used.
- a container made of the hBN sintered body was filled with the raw material and solvent in a weight ratio of 1:10 (step S210 in Fig. 2). All of these solvent formulations and sample fillings were done in air. After melting the metal solvent using a resistance heating furnace (step S 220 in FIG. 2), the crystal was synthesized by slow cooling (step S 230 in FIG. 2).
- FIG. 15 is a diagram showing the results of optical microscope observation according to Example 8.
- FIG. Figure 15 clearly shows that a colorless, transparent crystal was obtained. It was also confirmed that the obtained hBN crystal had a size that was easy to handle (thickness of 40 ⁇ or more).
- Example 9 As a raw material, hexagonal boron nitride (particle size: about 0.5 / zm) subjected to deoxidation treatment by heat treatment at 1500 ° C in a vacuum and 2000 ° C in a nitrogen stream was used.
- a flake-shaped Ni—V alloy with a Ni weight ratio of 53% and a flake-shaped Co—Mo alloy with a weight ratio of Co of 60% have a weight ratio of 1: 1.
- the mixture was used so that A container made of hBN sintered body was filled with the raw material and the solvent in a weight ratio of 1:10 (step S210 in Fig. 2). All of these solvent preparations and sample fillings were performed in air.
- step S 220 in FIG. 2 After melting the metal solvent using a resistance heating furnace (step S 220 in FIG. 2), the crystal was synthesized by slow cooling (step S 230 in FIG. 2).
- the synthesis conditions were as follows: the heating rate was about 250 ° CZ and heated to 1400 ° C, held for 6 hours, then cooled to 1240 at about 4 ° CZ, and then allowed to cool to room temperature.
- the obtained crystals were observed with an optical microscope (Fig. 16).
- FIG. 16 is a diagram showing the results of optical microscope observation according to Example 9. Figure 16 clearly shows that a colorless, transparent crystal was obtained. It was also confirmed that the obtained hBN crystals were of a size that was easy to handle (thickness of 40 m or more). From Examples 8 and 9, even when V is used instead of Cr and Ti N, high-purity h BN that is easy to handle without using a sapphire substrate and that can stand by itself It was found that crystals were obtained.
- Example 1 Since it is the same as that of Example 3 except having arrange
- Industrial Applicability The hBN crystal obtained by the present invention is applied to a deep ultraviolet light emitting material and any device using the material.
- the deep ultraviolet light-emitting material comprising the hBN crystal of the present invention is a medical device such as optical electronics for ultrahigh density optical recording utilizing the light condensing property of short-wavelength ultraviolet light, and an ultrafine optical laser / female. Furthermore, it can be used for environmental chemistry such as decomposition of dioxin.
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Priority Applications (4)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
AT08764820T ATE522644T1 (de) | 2007-05-24 | 2008-05-22 | Verfahren zur herstellung eines uv- lichtemittierenden hexagonalen bornitridkristalls |
JP2009516349A JP5257995B2 (ja) | 2007-05-24 | 2008-05-22 | 紫外線発光六方晶窒化ホウ素結晶体の製造方法 |
US12/451,641 US7811909B2 (en) | 2007-05-24 | 2008-05-22 | Production of a hexagonal boron nitride crystal body capable of emitting out ultraviolet radiation |
EP08764820A EP2154273B1 (en) | 2007-05-24 | 2008-05-22 | Method for production of ultraviolet light-emitting hexagonal boron nitride crystal |
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JP2008007388A (ja) | 2006-06-30 | 2008-01-17 | National Institute For Materials Science | 六方晶窒化ホウ素結晶体を製造する方法 |
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CN100490205C (zh) * | 2003-07-10 | 2009-05-20 | 国际商业机器公司 | 淀积金属硫族化物膜的方法和制备场效应晶体管的方法 |
US7795050B2 (en) * | 2005-08-12 | 2010-09-14 | Samsung Electronics Co., Ltd. | Single-crystal nitride-based semiconductor substrate and method of manufacturing high-quality nitride-based light emitting device by using the same |
WO2007029655A1 (ja) * | 2005-09-05 | 2007-03-15 | Matsushita Electric Industrial Co., Ltd. | 六方晶系窒化物単結晶の製造方法、六方晶系窒化物半導体結晶及び六方晶系窒化物単結晶ウエハの製造方法 |
JP2007220865A (ja) * | 2006-02-16 | 2007-08-30 | Sumitomo Chemical Co Ltd | 3族窒化物半導体発光素子およびその製造方法 |
JP4879614B2 (ja) * | 2006-03-13 | 2012-02-22 | 住友化学株式会社 | 3−5族窒化物半導体基板の製造方法 |
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JP2008007388A (ja) | 2006-06-30 | 2008-01-17 | National Institute For Materials Science | 六方晶窒化ホウ素結晶体を製造する方法 |
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WO2022071245A1 (ja) * | 2020-09-30 | 2022-04-07 | デンカ株式会社 | 六方晶窒化ホウ素粉末、及び焼結体の製造方法 |
JP7241247B2 (ja) | 2020-09-30 | 2023-03-16 | デンカ株式会社 | 六方晶窒化ホウ素粉末、及び、窒化ホウ素焼結体の製造方法 |
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EP2154273A1 (en) | 2010-02-17 |
ATE522644T1 (de) | 2011-09-15 |
EP2154273A4 (en) | 2010-12-01 |
US20100120187A1 (en) | 2010-05-13 |
EP2154273B1 (en) | 2011-08-31 |
US7811909B2 (en) | 2010-10-12 |
JP5257995B2 (ja) | 2013-08-07 |
JPWO2008146865A1 (ja) | 2010-08-19 |
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