Phosphor, light-emitting device, and method for manufacturing a phosphor

Abstract

To provide a novel phosphor. [Solution] Composition is general formula: KAl m O n A phosphor represented by :xEu,yMn. In this general formula, m is between 25 and 100, n is between 40 and 150, x>0, y>0, and x / y is between 0.7 and 2.0. Furthermore, in the diffraction spectrum obtained by X-ray diffraction measurement of this phosphor, a peak is observed in the range of 2θ from 33.8° to 34.2°.

Description

Technical Field

[0001] The present invention relates to a phosphor, a light-emitting device, and a method for producing a phosphor.

Background Art

[0002] Regarding phosphors, various studies have been conducted so far because of their industrial importance. For example, Non-Patent Document 1 discloses that a phosphor represented by the composition KAl 11 ,

[0004] O 17 :0.1Eu 2+ ,0.15Mn 2+ is excited by ultraviolet light with a wavelength of 340 nm and emits visible light with a wavelength of 510 nm.

Prior Art Documents

Non-Patent Documents

[0003]

Non-Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] Searching for new phosphors is important from the viewpoints of basic research and fundamental improvement of the performance obtained with existing phosphors. This time, while referring to the description of Citation Document 1, the inventors repeated studies with the aim of providing a novel phosphor different from the phosphors specifically described in Citation Document 1.

Means for Solving the Problems

[0005] The inventors of the present invention have completed the invention provided below and solved the above problems.

[0006] 1. A phosphor represented by KAl m O n :xEu,yMn, wherein m is 25 to 100, n is 40 to 150, x > 0, y > 0, and x / y is 0.7 to 2.0, and in the diffraction spectrum obtained when the phosphor is subjected to X-ray diffraction measurement, a peak is observed within the range of 2θ of 33.8° to 34.2°. 2. The phosphor according to 1., wherein in the diffraction spectrum, a peak A is observed within the range of 2θ of 25.0° to 26.0°, and a peak B is observed within the range of 2θ = of 21.0° to 22.0°, when the height of peak A based on the baseline is I A and the height of peak 2 based on the baseline is I B then the value of I B / I A is 0.60 or more. 3. The phosphor according to 1. or 2., wherein in the diffraction spectrum, a peak is observed within the range of 2θ of 36.0° to 36.5°. 4. The phosphor according to any one of 1. to 3., wherein in the diffraction spectrum, a peak C is observed within the range of 2θ of 37.5° to 38.0°, and a peak D is observed within the range of 2θ of 36.0° to 37.5°. When the height of peak C based on the baseline is I C and the height of peak D based on the baseline is I D then the value of I D / I C is 0.50 or less. 5. The phosphor according to any one of 1. to 4., wherein In the diffraction spectrum, a peak E was observed in the range of 2θ from 44.0° to 45.0°, and a peak F was observed in the range of 2θ from 46.0° to 47.0°. The height of peak E relative to the baseline was defined as I E And the height of peak F relative to the baseline is I F In that case, I F / I E A phosphor whose value is 0.40 or less. 6. A phosphor described in any one of 1. to 5., A phosphor with a lattice constant a of 5.619–5.620 angstroms and a lattice constant c of 22.50–22.61 angstroms. 7. A light-emitting element capable of emitting ultraviolet light, A wavelength conversion member containing a phosphor described in any one of 1. to 6., A light-emitting device equipped with the following features. 8. A method for producing a phosphor according to any one of 1. to 6., Formation is KAl 11 O 17 A mixing step to obtain a mixture by mixing the compound represented by, a europium source, and a manganese source, A firing step in which the mixture is fired at 1650°C or higher, A method for producing a phosphor containing 9. A method for producing a phosphor as described in 8. A method for producing a phosphor, wherein the europium source comprises an oxide, nitride, halide, or hydroxide of europium. 10. A method for producing a phosphor as described in 8. or 9., A method for producing a phosphor, wherein the manganese source comprises a manganese oxide, nitride, halide, or carbonate. [Effects of the Invention]

[0007] The present invention provides a novel phosphor. The phosphor of the present invention is considered to be industrially useful. [Brief explanation of the drawing]

[0008] [Figure 1] These are the X-ray diffraction spectra of the phosphors obtained in the examples and reference examples. [Figure 2] These are the X-ray diffraction spectra of the phosphors obtained in the examples and reference examples. [Figure 3] These are the X-ray diffraction spectra of the phosphors obtained in the examples and reference examples. [Figure 4] These are the X-ray diffraction spectra of the phosphors obtained in the examples and reference examples. [Figure 5] These are the X-ray diffraction spectra of the phosphors obtained in the examples and reference examples. [Modes for carrying out the invention]

[0009] Embodiments of the present invention will be described in detail below with reference to the drawings. The drawings are for illustrative purposes only, and the present invention should not be interpreted as being limited by the drawings.

[0010] In this specification, the notation "X~Y" in descriptions of numerical ranges means "X or greater and Y or less" unless otherwise specified. For example, "1~5 mass%" means "1 mass% or greater and 5 mass% or less".

[0011] <Phosphor> The composition of the phosphor in this embodiment is KAl m O n It is represented as :xEu,yMn. In this empirical formula, m is between 25 and 100, n is between 40 and 150, x>0, y>0, and x / y is between 0.7 and 2.0. In the diffraction spectrum obtained when the phosphor of this embodiment is measured by X-ray diffraction, a peak is observed in the range of 2θ from 33.8° to 34.2°. Incidentally, according to the inventors' knowledge, the phosphor described in Non-Patent Document 1 has the same or similar chemical composition as the phosphor of this embodiment, but it is believed that the above-mentioned peaks are not observed in the diffraction spectrum.

[0012] The phosphor of this embodiment typically has different light absorption and emission characteristics than phosphors with the same or similar chemical composition but without the above-mentioned peaks. For example, the phosphor of this embodiment typically absorbs light at a wavelength of about 400 nm and emits light at longer wavelengths more readily than phosphors with the same or similar chemical composition but without the above-mentioned peaks. In other words, the phosphor of this embodiment can typically convert light at a wavelength of about 400 nm into light at longer wavelengths with relatively high efficiency.

[0013] The phosphor of this embodiment can be manufactured by using appropriate materials in appropriate amounts and employing appropriate manufacturing processes and conditions. Details will be explained later, but to briefly explain the appropriate manufacturing processes and conditions, the phosphor of this embodiment first has the composition formula KAl 11 O 17 The product can be produced by preparing a compound represented by [formula], mixing it with a europium source and a manganese source to form a mixture, and then calcining the mixture at 1650°C or higher. Although the details are unclear, it is likely that by adopting such a manufacturing process and conditions, a novel phosphor can be obtained that may have the same or similar chemical composition as the prior art, but with a different crystal structure. The diffraction peaks in the range of 33.8° to 34.2° mentioned above are thought to reflect the crystal structure of the novel phosphor. If appropriate manufacturing processes and conditions are not adopted, it may not be possible to manufacture the phosphor of this embodiment.

[0014] The description of the phosphor in this embodiment will continue.

[0015] (Crystal structure and composition) The phosphor of this embodiment is KAl, which typically has a β-Al2O3 crystal structure. 11 O 17It is thought to contain the above. However, considering the presence of other phases that inevitably occur during manufacturing and the volatilization of some elements (especially K and Mn) during manufacturing, the numerical range of each subscript in the above composition formula is set to be wide. Incidentally, regarding the volatilization of K, please note that in the examples and reference examples shown later, the higher the firing temperature, the larger the proportion of elements other than K (i.e., the relatively smaller the proportion of K).

[0016] m can be between 25 and 100, but is preferably between 30 and 90, more preferably between 32 and 80, and even more preferably between 34 and 75. n can be between 40 and 150, but is preferably between 50 and 130, and more preferably between 55 and 120.

[0017] The amount of Eu, the amount of Mn, and their ratios can affect the luminescence properties. x can be greater than 0, but is preferably 0.1 to 2.0, more preferably 0.3 to 1.5, and even more preferably 0.5 to 1.2. y can be greater than 0, but is preferably 0.1 to 2.0, more preferably 0.3 to 1.5, even more preferably 0.5 to 1.2, and particularly preferably 0.6 to 1.0. x / y can be between 0.7 and 2.0, but is preferably between 0.7 and 1.5, more preferably between 0.7 and 1.3, and even more preferably between 0.8 and 1.2.

[0018] (Other peaks in the diffraction spectrum) As described above, in the diffraction spectrum obtained when the phosphor of this embodiment is measured by X-ray diffraction, a peak is observed in the range of 2θ from 33.8° to 34.2°. Due to the novel crystal structure of the phosphor in this embodiment, other peaks may be present in the diffraction spectrum. Preferably, the following peaks are present in the diffraction spectrum.

[0019] Some specific peaks and their intensities are described below. The diffraction spectrum obtained when the phosphor of this embodiment is measured by X-ray diffraction preferably satisfies at least one of the following (1) to (4), more preferably two or more, even more preferably three or more, and particularly preferably all of the following (1) to (4).

[0020] (1) In the diffraction spectrum, peak A is observed in the range of 2θ = 25.0° to 26.0°, and peak B is observed in the range of 2θ = 21.0° to 22.0°. Then, the height of peak A relative to the baseline is I A And the height of peak 2 relative to the baseline is I B In that case, I B / I A The value is preferably 0.60 or higher, and more preferably 0.60 to 0.70. (2) In the diffraction spectrum, a peak is observed in the range of 2θ from 36.0° to 36.5°. (3) In the diffraction spectrum, peak C is observed in the range of 2θ from 37.5° to 38.0°, and peak D is observed in the range of 2θ from 36.0° to 37.5°. The height of peak C relative to the baseline is I C And the height of peak D relative to the baseline is I D In that case, I D / I C The value of is preferably 0.50 or less, and more preferably 0.10 to 0.50. (4) In the diffraction spectrum, a peak E is observed in the range of 2θ from 44.0° to 45.0°, and a peak F is observed in the range of 2θ from 46.0° to 47.0°. The height of peak E relative to the baseline is I E And the height of peak F relative to the baseline is I F In that case, I F / I E The value is preferably 0.40 or less, and more preferably 0.30 to 0.40.

[0021] (Lattice constant) Since the lattice constant depends on the crystal structure, the magnitude of the lattice constant of the phosphor in this embodiment can be important information regarding the crystal structure. In other words, by designing and manufacturing the phosphor so that the lattice constant is a specific value, it may be possible to improve its properties. In the phosphor of this embodiment, the lattice constant a is preferably 5.619 to 5.620 angstroms, and the lattice constant c is preferably 22.50 to 22.61 angstroms.

[0022] (others) The phosphor in this embodiment is typically in powder form, that is, an aggregate of multiple phosphor particles. When the phosphor in this embodiment is in powder form, its particle size distribution is not particularly limited. Considering its application to a wavelength conversion member, for example, a particle size distribution such that 90% or more by mass of the phosphor powder passes through a sieve with a mesh size of 45 μm is sufficient. Of course, the particle size distribution is not limited to this.

[0023] <Method for manufacturing phosphors> The phosphor of this embodiment is The chemical formula is KAl 11 O 17 A mixing step to obtain a mixture by mixing the compound represented by, a europium source, and a manganese source, A firing process in which the above mixture is fired at 1650°C or higher, It can be manufactured by [method].

[0024] The above manufacturing method is for a composition formula of KAl 11 O 17 This method involves solid-solving Eu and Mn into a crystal (host crystal) of the compound represented by [the formula shown]. Although the details are unclear, it is presumed that by employing such a method, Eu and Mn are more easily incorporated into the crystal structure as intended, and the formation of heterogeneous phases is suppressed. Incidentally, in Non-Patent Literature 1, a phosphor is produced by mixing a europium source, a manganese source, Al2O3, and K2CO3 and firing them in a single step. According to the inventor's knowledge, when such a production method is adopted, a large amount of impurities are generated, which can result in the above-mentioned full width at half maximum not being the desired value, or it may be difficult to solid-solve the desired amount of Eu and Mn.

[0025] The chemical formula is KAl 11 O 17 The compound represented by the equation can be used if it is available on the market, or if it is not available on the market, it can be prepared by, for example, calculating the molar ratio of Al2O3 and K2CO3, grinding them in a mortar and pestle, dry blending them, and calcining them at a temperature of 1400-1800°C under an inert atmosphere such as nitrogen gas. The molar ratio of Al2O3 to K2CO3 is given by the reaction equation K2CO3 + 11Al2O3 → 2KAl 11 O 17 The setting should be determined according to the +CO2 ratio. See the examples below for details.

[0026] KAl obtained from the market 11 O 17 Alternatively, KAl obtained as described above. 11 O 17 Then, by mixing a europium source and a manganese source in appropriate ratios to obtain a mixture, and then calcining that mixture, the composition becomes KAl m O n A phosphor represented by :xEu,yMn can be manufactured. Specifically, KAl 11 O 17 The europium source and manganese source are dry-blended in appropriate ratios to form a mixture, which is then placed in a crucible, for example, made of boron nitride, and fired. The firing is preferably carried out under an inert atmosphere such as nitrogen gas. The preferred firing temperature is 1650°C or higher, more preferably 1650 to 1900°C, and even more preferably 1750 to 1850°C. The firing time can be, for example, 1 to 8 hours. In this way, the phosphor of this embodiment can be manufactured.

[0027] Examples of europium sources include europium oxides, nitrides, halides, or hydroxides. Eu2O3 is preferred as the europium source. Examples of manganese sources include manganese oxides, nitrides, halides, or carbonates. While the valency of manganese in manganese oxides can vary, considering the valency of manganese in the final product, MnO is preferred as the manganese source.

[0028] <Light-emitting device> A light-emitting device can be constructed using a light-emitting element capable of emitting ultraviolet light and a wavelength conversion member containing the aforementioned phosphor. In the light-emitting device, when light with a wavelength of approximately 400 nm emitted from the light-emitting element strikes the wavelength conversion member, the phosphor in the wavelength conversion member emits light. As described above, the phosphor in this embodiment absorbs light with a wavelength of approximately 400 nm and readily emits light with a longer wavelength. Therefore, by configuring the light-emitting device described above using an element that emits light with a wavelength of approximately 400 nm as the light-emitting element, it is possible to obtain light with a longer wavelength.

[0029] The wavelength conversion component can be composed of the aforementioned phosphor (usually in powder form) and a sealing material that encapsulates the phosphor. As the sealing material, for example, various curable resin materials (materials that harden with heat and / or light) can be used. Any curable resin material can be used as long as it is sufficiently transparent and provides the optical properties required for displays and lighting devices. Examples of sealing materials include silicone resin materials. Curable silicone resin materials are supplied by companies such as Toray Dow Corning and Shin-Etsu Chemical. Silicone resin materials are preferable because they offer high transparency and excellent heat resistance. Other sealing materials include epoxy resin materials and urethane resin materials.

[0030] The embodiments of the present invention have been described above, but these are merely examples, and various other configurations can be adopted. Furthermore, the present invention is not limited to the embodiments described above, and modifications, improvements, etc., within the scope that can achieve the objectives of the present invention are included in the present invention. [Examples]

[0031] Embodiments of the present invention will be described in detail based on examples and reference examples. It should be noted that the present invention is not limited to these examples.

[0032] <Examples and Reference Examples: Production of Phosphors> (Stage 1: KAl) 11 O 17 (Manufacturing) Al2O3 (Daimyo Chemical Co.) and K2CO3 (High Purity Chemical Co.) were prepared. Al2O3 was weighed in a ratio of 89.86% by mass and K2CO3 in a ratio of 10.14% by mass, ground in a mortar, and then dry-blended. The degree of grinding was such that the mixture could pass through a nylon sieve with a mesh size of 250 μm almost completely. This is how we obtained a blend of Al2O3 and K2CO3. The above blend was placed in a boron nitride crucible and calcined at 1800°C for 4 hours under a nitrogen gas atmosphere (N2: 0.85 MPa). The resulting calcined material was then ground in a mortar until it could pass through a nylon sieve with a mesh size of 250 μm.

[0033] (Second stage: Solid solution of Mn and Eu) KAl manufactured as described above 11 O 17 A mixture was prepared by dry blending 91.4% by mass of iodine, 5% by mass of Eu2O3 (purchased from Nippon Yttrium Co., Ltd.), and 3.6% by mass of MnO (purchased from Kojunsei Kagaku Co., Ltd.). This mixture was placed in a boron nitride crucible and calcined under a nitrogen gas atmosphere (N2: 0.85 MPa) at the calcination temperature described below for 4 hours. The resulting calcined product was then ground in a mortar until it could pass through a nylon sieve with a mesh size of 250 μm. [Firing temperature] Example 1: 1800℃ Example 2: 1700 °C Reference Example 1: 1600 °C Reference Example 2: 1500 °C Reference Example 3: 1400 °C

[0034] The phosphor was produced as described above.

[0035] <X-ray Diffraction Measurement> A measurement cell filled with the produced powdered phosphor was set in an X-ray diffractometer “D8 ADVANCE A25” (3 kW) manufactured by Bruker, and X-ray diffraction measurement was performed by irradiating the phosphor with X-rays (Cu-Kα rays). Also, as analysis software, “DIFFRAC.EVA” for powder XRD data analysis and “TOPAS” for powder analysis software were used (these software are also provided by Bruker). For the baseline, the one automatically obtained by the software was adopted.

[0036] The obtained diffraction spectra are shown in Figs. 1 to 5. For the discrimination of minute spectra, a partial region of the spectra is enlarged and shown. For reference, on the horizontal axis of each figure, the peak positions of the diffraction spectra of Al2O3 crystals and K2Al 22 O 34 crystals obtained by theoretical calculation are also shown respectively. A “*” is attached to the peak position of the diffraction spectrum of Al2O3 crystals.

[0037] For the phosphors fired at 1700 °C and 1800 °C, peaks were observed within the range of 2θ = 33.8° to 34.2°. On the other hand, for the phosphors fired at 1600 °C or lower, no peak was observed within the range of 2θ = 33.8° to 34.2°.

[0038] Also, in each phosphor, peak A was observed within the range of 2θ = 25.0° to 26.0°, and peak B was observed within the range of 2θ = 21.0° to 22.0°. The height of peak A with respect to the baseline is IA And the height of peak 2 relative to the baseline is I B In that case, I B / I A The values ​​were as shown in Table 1.

[0039] Furthermore, in the phosphors of Examples 1 and 2, peaks were observed within the range of 2θ from 36.0° to 36.5°.

[0040] Furthermore, for each phosphor, peak C was observed within the range of 2θ 37.5° to 38.0°, and peak D was observed within the range of 2θ 36.0° to 37.5°. The height of peak C relative to the baseline was defined as I C And the height of peak D relative to the baseline is I D In that case, I D / I C The values ​​were as shown in Table 1.

[0041] Furthermore, for each phosphor, a peak E was observed in the range of 2θ from 44.0° to 45.0°, and a peak F was observed in the range of 2θ from 46.0° to 47.0°. The height of peak E relative to the baseline was defined as I. E And the height of peak F relative to the baseline is I F In that case, I F / I E The values ​​were as shown in Table 1.

[0042] Furthermore, the lattice constants of each phosphor were calculated based on the obtained X-ray diffraction spectra. The aforementioned software was used for the calculations.

[0043] The following is a summary of the various pieces of information obtained from the analysis of X-ray diffraction measurement results. The unit of the lattice constant is angstroms.

[0044] [Table 1]

[0045] <Determination of composition (elemental ratio)> The elemental content in the phosphor was measured using the following procedure. First, the phosphor was dissolved by pressurized acid decomposition to prepare the sample solution. Next, the obtained sample solution was subjected to quantitative elemental analysis using an ICP emission spectrometer (ICPE-9820, Shimadzu Corporation). In this analysis, the detection limits for each element were: K: ≤1 ppb, Al: 1-10 ppb, Mn: ≤1 ppb, and Eu: ≤1 ppb. For oxygen (O), the mass of O was calculated by subtracting the masses of all elements other than O from the total mass of the phosphor (100 parts by mass). This mass was then converted to a molar amount to determine the value of the subscript n.

[0046] The table below shows the m, n, x, y, and x / y values ​​for each phosphor, based on the results of the compositional analysis.

[0047] [Table 2]

[0048] <Characteristic Evaluation> A reference sample of BaSO4 was placed in the side opening (φ10 mm) of an integrating sphere (φ60 mm). Specifically, BaSO4 (product code 022-00425) manufactured by Fujifilm Wako Pure Chemical Industries, Ltd. was filled into the recess of a concave cell, and this cell was placed in the opening of the integrating sphere. Monochromatic light with wavelengths of 340 nm, 385 nm, or 455 nm was introduced into this integrating sphere via an optical fiber, and the spectrum of the reflected light was measured using a spectrophotometer (manufactured by Otsuka Electronics Co., Ltd., product name QE-2100). At this time, the number of excitation photons (Qex) was calculated from the spectrum in the wavelength range of 300 to 650 nm.

[0049] Next, the phosphor powders obtained in each example were packed into concave cells so that the surface was smooth, and these were placed in the opening of an integrating sphere. Monochromatic light with wavelengths of 340 nm, 385 nm, or 455 nm was irradiated onto the cells, and the spectra of the excited reflected light and fluorescence were measured using a spectrophotometer.

[0050] Based on the obtained emission spectra, the number of excited and reflected photons (Qref) and the number of fluorescent photons (Qem) were calculated at wavelengths of 340 nm, 385 nm, and 455 nm. The number of excited and reflected photons was calculated in the same wavelength range as the number of excited photons, while the number of fluorescent photons was calculated in the wavelength range of 300 to 650 nm. From the three types of photon counts obtained, the absorption rate abs (=(Qex-Qref) / Qex×100), internal quantum efficiency IQE (=Qem / (Qex-Qref)×100), and external quantum efficiency EQE (=Qem / Qex×100) for each wavelength of light were determined.

[0051] Based on the obtained emission spectrum, chromaticity X and chromaticity Y were also determined. Specifically, the CIE chromaticity coordinate x value (chromaticity X) in the XYZ color system defined in JIS Z8781-3:2016 was calculated from the spectral data in the wavelength range of 300 to 650 nm of the fluorescence spectrum, in accordance with JIS Z8724:2015.

[0052] When the wavelength of the irradiated light was 340 nm or 385 nm, the wavelength of the peak top of the peak with a maximum between 500 and 550 nm, as well as the full width at half maximum, were determined based on the obtained emission spectrum.

[0053] Various pieces of information are summarized below.

[0054] [Table 3]

[0055] The inventor's analysis of the characteristics evaluation results is described below. The absorption rates of the phosphors in Examples 1 and 2 for light around 400 nm (wavelengths of 385 nm and 455 nm) were higher than those in Reference Examples 1-3. In other words, the phosphors in Examples 1 and 2 readily absorb light around 400 nm. Furthermore, the internal and external quantum efficiencies of the phosphors in Examples 1 and 2 were greater than those of Reference Examples 1-3 when irradiated with light around 400 nm (wavelengths of 385 nm and 455 nm). This indicates that certain phosphors, such as those in Examples 1 and 2, can efficiently convert light around 400 nm into light of longer wavelengths.

Claims

1. Composition is KAl ｍ O ｎ A phosphor represented by xEu, yMn, m is between 25 and 100, n is between 40 and 150, x > 0, y > 0, and x / y is between 0.7 and 2.

0. A phosphor in which, when measured by X-ray diffraction, a peak is observed in the diffraction spectrum within the range of 2θ from 33.8° to 34.2°.

2. A phosphor according to claim 1, In the diffraction spectrum, peak A is observed in the range of 2θ = 25.0° to 26.0°, and peak B is observed in the range of 2θ = 21.0° to 22.0°. The height of peak A relative to the baseline is I Ａ And the height of peak 2 relative to the baseline is I Ｂ In that case, I Ｂ / I Ａ A phosphor whose value is 0.60 or higher.

3. A phosphor according to claim 1 or 2, A phosphor in which a peak is observed in the diffraction spectrum within the range of 2θ from 36.0° to 36.5°.

4. A phosphor according to claim 1 or 2, In the diffraction spectrum, peak C is observed within the range of 2θ from 37.5° to 38.0°, and peak D is observed within the range of 2θ from 36.0° to 37.5°. Let the height of peak C with respect to the baseline be I Ｃ and the height of peak D with respect to the baseline be I Ｄ . When I Ｄ / I Ｃ is at most 0.50, a phosphor.

5. A phosphor according to claim 1 or 2, In the diffraction spectrum, a peak E was observed in the range of 2θ from 44.0° to 45.0°, and a peak F was observed in the range of 2θ from 46.0° to 47.0°. The height of peak E relative to the baseline was defined as I Ｅ And the height of peak F relative to the baseline is I Ｆ In that case, I Ｆ / I Ｅ A phosphor whose value is 0.40 or less.

6. A phosphor according to claim 1 or 2, A phosphor having a lattice constant a of 5.619 to 5.620 angstroms and a lattice constant c of 22.50 to 22.61 angstroms.

7. A light-emitting element capable of emitting ultraviolet light, A wavelength conversion member comprising the phosphor described in claim 1 or 2, A light-emitting device equipped with the following features.

8. A method for producing a phosphor according to claim 1 or 2, The formula is KAl １１ O １７ A mixing step to obtain a mixture by mixing the compound represented by, a europium source, and a manganese source, A firing step in which the mixture is fired at 1650°C or higher, A method for producing a phosphor containing

9. A method for producing a phosphor according to claim 8, A method for producing a phosphor, wherein the europium source comprises an oxide, nitride, halide, or hydroxide of europium.

10. A method for producing a phosphor according to claim 8, A method for producing a phosphor, wherein the manganese source comprises a manganese oxide, nitride, halide, or carbonate.

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