Phosphor particles, composite and light-emitting device

Abstract

Fluorescent body particles according to the present invention have a compositional makeup represented by general formula (1) A2MF6:Mn. In general formula (1), element A is one or more alkali metal elements including K, and element M is Si alone, Ge alone, or a combination between Si and at least one element selected from the group consisting of Ge, Sn, Ti, Zr, and Hf. The fluorescent body particles each include a first plate-like part and a second plate-like part that is at least partially connected with the first plate-like part. The first plate-like part and the second plate-like are not parallel to each other.

Description

Technical Field

[0001] The present invention relates to phosphor particles, composites, and light-emitting devices.

[0002] As a phosphor capable of converting blue light emitted from a blue light-emitting diode into red light, a fluoride phosphor represented by K2SiF6:Mn (often abbreviated as "KSF phosphor", etc.) is known. This phosphor is efficiently excited by blue light. Further, the half-value width of the emission spectrum of this phosphor is narrow and sharp. Therefore, by using this phosphor as a red phosphor, a white LED with high brightness and excellent color rendering properties and color reproducibility can be realized.

[0003] As prior art of fluoride phosphors, for example, Patent Document 1 can be cited. Patent Document 1 describes a fluoride phosphor having a composition represented by the general formula A2MF6:Mn, a bulk density of 0.80 g / cm3 or more, and a mass median diameter of 30 μm or less. In the general formula, 0 < n ≦ 0.1, element A is one or more alkali metal elements containing K, and element M is a combination of Si alone, Ge alone, or one or more elements selected from the group consisting of Si and Ge, Sn, Ti, Zr, and Hf. (1-n) F6:Mn 4+ n represented by, and having a bulk density of 0.80 g / cm 3 or more and a mass median diameter of 30 μm or less is described. In the general formula, 0 < n ≦ 0.1, element A is one or more alkali metal elements containing K, and element M is Si alone, Ge alone, or a combination of one or more elements selected from the group consisting of Si and Ge, Sn, Ti, Zr, and Hf.

[0004] Further, Patent Document 2 can also be cited as prior art of fluoride phosphors. Patent Document 2 describes a phosphor characterized by comprising a crystal having a structure in which a transition metal is substituted as an activator in a part of a host crystal represented by A2BF6 (where A is K, Na, Rb, or Cs, and B is Si, Ge, Sn, Ti, or Zr, excluding combinations of K and Si, K and Ge, and K and Ti).

Prior Art Documents

Patent Documents

[0005]

Patent Document 1

[0006] As white LEDs become more widespread, there is a demand for further improvement in the luminescence properties of fluoride phosphors.

[0007] The present inventors have carried out various investigations with the aim of obtaining a fluoride phosphor having good luminescence characteristics. [Means for solving the problem]

[0008] Through investigation, the inventors have completed the invention provided below.

[0009] According to the present invention, the following phosphor particles are provided.

[0010] A phosphor particle having a composition represented by the following general formula (1): A phosphor particle comprising a first plate-shaped portion and a second plate-shaped portion at least partially connected to the first plate-shaped portion, the first plate-shaped portion and the second plate-shaped portion being not parallel to each other. General formula (1):A2MF6:Mn In the general formula (1), Element A is one or more alkali metal elements containing K, The element M is a single element of Si, a single element of Ge, or a combination of Si and one or more elements selected from the group consisting of Ge, Sn, Ti, Zr, and Hf.

[0011] Further, according to the present invention, A composite material comprising the above phosphor powder and a sealing material that seals the phosphor powder. is provided.

[0012] Further, according to the present invention, A light-emitting device comprising a light-emitting element that emits excitation light and the above-mentioned composite that converts the wavelength of the excitation light. is provided. Effect of the Invention

[0013] The present invention provides a fluoride phosphor having good luminescence properties. [Brief description of the drawings]

[0014] [Figure 1] 4A and 4B are diagrams for explaining the shape of phosphor particles. [Diagram 2] 4A and 4B are diagrams for explaining the shape of phosphor particles. [Diagram 3] FIG. 1 illustrates an example of a light emitting device. [Figure 4] 1 is an electron microscope image of the phosphor particles produced in Example 1. [Diagram 5] 1 is an electron microscope image of phosphor particles produced in Example 2. [Figure 6] 1 is an electron microscope image of phosphor particles produced in Comparative Example 1. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0015] Hereinafter, an embodiment of the present invention will be described in detail with reference to the drawings. All drawings are for illustrative purposes only. The shapes and dimensional ratios of each member in the drawings do not necessarily correspond to the actual articles.

[0016] In this specification, unless otherwise specified, the expression "X to Y" in the explanation of a numerical range means from X to Y. For example, "1 to 5% by mass" means "from 1% by mass to 5% by mass".

[0017] <Phosphor particles> The composition of the phosphor particles of this embodiment is represented by the following general formula (1): With this composition, the phosphor particles of this embodiment convert the blue light normally emitted from a blue LED into red light. General formula (1):A2MF6:Mn In the general formula (1), Element A is one or more alkali metal elements containing K, The element M is a single element of Si, a single element of Ge, or a combination of Si and one or more elements selected from the group consisting of Ge, Sn, Ti, Zr, and Hf.

[0018] In terms of "shape", the phosphor particle of this embodiment, as shown in Fig. 1, comprises a first plate-shaped portion 1 and a second plate-shaped portion 2 that is at least partially connected to the first plate-shaped portion 1. The first plate-shaped portion 1 and the second plate-shaped portion 2 are not parallel to each other, that is, θ shown in Fig. 1 is greater than 0° and less than 180°. In short, it can be said that the phosphor particle of this embodiment has a form in which "two non-parallel plate-shaped phosphors" are connected.

[0019] It is speculated that the "two non-parallel plate-shaped phosphors" prevent the incident blue light from simply being reflected without being emitted, thereby improving the luminescence characteristics.

[0020] Incidentally, to the inventors' knowledge, in the investigation of phosphor particles having the composition expressed by general formula (1), the "peculiar shape" of the phosphor particles has never been noticed, and the phosphor particles having two non-parallel plate-like phosphors are unique to the inventors.

[0021] The phosphor particles of this embodiment can be manufactured by using appropriate raw materials and adopting appropriate manufacturing methods and manufacturing conditions. For example, one of the points is to instantaneously make the aqueous solution supersaturated when precipitating phosphor particles by controlling the saturation degree of the aqueous solution. The manufacturing method will be described in detail later.

[0022] The phosphor particles of this embodiment will be described further.

[0023] (About the shape) 1, the first plate-shaped portion 1 and the second plate-shaped portion 2 are each depicted as being rectangular, but the shapes of the first plate-shaped portion 1 and the second plate-shaped portion 2 are not limited to being rectangular. Each of the first plate-shaped portion 1 and the second plate-shaped portion 2 may have a flat region large enough to be observed with an electron microscope.

[0024] The first plate-shaped portion 1 and the second plate-shaped portion 2 may be connected at a portion other than the end of one plate-shaped portion and the end of the other plate-shaped portion, as shown in Fig. 2. However, preferably, the first plate-shaped portion 1 and the second plate-shaped portion 2 are connected at their respective ends. It is believed that by connecting the first plate-shaped portion 1 and the second plate-shaped portion 2 at their respective ends, the aforementioned "incident blue light is simply reflected without being emitted" is further suppressed, leading to further improvement in the light-emitting properties.

[0025] The angle θ between the first plate-shaped portion 1 and the second plate-shaped portion 2 is preferably an acute angle, more preferably 20° to 50°, and even more preferably 30° to 45°. By making the angle θ an acute angle, blue light enters the acute angle portion, and the above-mentioned "incident blue light is simply reflected without being emitted" is further suppressed, which is thought to lead to further improvement in the light-emitting characteristics. Just to be clear, when the first plate-shaped portion 1 and the second plate-shaped portion 2 are connected at a portion that is not the end of one plate-shaped portion and at an end of the other plate-shaped portion, as shown in Figure 2, and the positional relationship between the first plate-shaped portion 1 and the second plate-shaped portion 2 is not a right angle, the angle between the first plate-shaped portion 1 and the second plate-shaped portion 2 is considered to be an "acute angle."

[0026] The thickness of each of the first plate-shaped portion 1 and the second plate-shaped portion 2 is, for example, 20 μm or less, preferably 0.5 μm to 20 μm, more preferably 1 μm to 20 μm, and even more preferably 1 μm to 5 μm. It is believed that the luminous efficiency per mass of the phosphor particles is increased, that is, the luminous efficiency of the phosphor particles is increased, by making the thickness not too large.

[0027] The major axis of the phosphor particles of this embodiment, as determined from an image taken by an electron microscope, is preferably 1 μm or more and 150 μm or less, and more preferably 5 μm or more and 50 μm or less. By having this major axis of an appropriate size, better light emission characteristics can be obtained. An image of phosphor particles taken by an electron microscope is a two-dimensional image, and the major axis varies depending on the direction of the phosphor particles photographed. However, even in consideration of this variation, better light emission characteristics can be obtained if the major axis falls within the above numerical range. In other words, the above numerical range of 1 μm or more and 150 μm or less is a numerical range that takes into consideration the variation in the major axis, which differs depending on the direction in which the phosphor particles are photographed.

[0028] (Composition: General formula (1)) The element A is one or more alkali metal elements containing K. Specifically, it can be K alone, or a combination of K and one or more alkali metal elements selected from Li, Na, Rb, and Cs. From the viewpoint of chemical stability, it is preferable that the content of K in the element A is high (for example, 50 mol % or more of K in the element A), and it is more preferable that the element A is K alone.

[0029] The element M is Si alone, Ge alone, or a combination of Si and one or more elements selected from the group consisting of Ge, Sn, Ti, Zr, and Hf. From the viewpoint of chemical stability, it is preferable that the content of Si in the element M is high (for example, 50 mol % or more of Si in the element M), and it is more preferable that the element M is Si alone.

[0030] <Method of manufacturing phosphor particles> The phosphor particles of this embodiment can be manufactured by using appropriate materials and selecting appropriate manufacturing methods and manufacturing conditions. Specific examples of the manufacturing methods are described in the Examples below, but two manufacturing methods, Manufacturing Methods 1 and 2, will be described below.

[0031] (Manufacturing method 1) In manufacturing method 1, roughly speaking, a solution in which the components constituting the phosphor particles represented by general formula (1) are dissolved is poured into a large amount of water to create a supersaturated state all at once, causing precipitation. It is believed that the rapid precipitation based on the supersaturated state results in the phosphor particles including the two plate-like portions as described above. Hereinafter, the manufacturing method 1 will be described by dividing it into a dissolution step and a precipitation step.

[0032] ·Dissolution process First, (i) a raw material containing element A (such as K), (ii) a raw material containing element M (preferably Si), (iii) a raw material containing F, (iv) a raw material containing Mn, etc. are dissolved in hydrofluoric acid (aqueous solution of HF). One raw material may serve as two or more of (i) to (iii). For example, K2SiF6 used in the examples serves as (i) to (iii). The concentration of hydrogen fluoride in the hydrofluoric acid before dissolving the raw materials is preferably 50 to 60 mass %.

[0033] From the viewpoint of chemical stability, a compound of element A is preferable as the raw material containing element A. For example, an oxide, hydroxide, fluoride, or carbonate of element A can be used. The source material containing F can be a fluoride as a source material for other elements (A, M, Mn). F can also be supplied from hydrogen fluoride in hydrofluoric acid used as a solvent. Examples of raw materials containing Mn include hexafluoromanganates, permanganates, oxides (except permanganates), fluorides (except hexafluoromanganates), chlorides, sulfates, and nitrates. Among them, fluorides are preferred because they can efficiently substitute Mn for the Si site in the fluoride phosphor and provide good luminescence characteristics, and among fluorides, hexafluoromanganates are preferred. Examples of hexafluoromanganates include Na2MnF6, K2MnF6, and Rb2MnF6. In particular, K2MnF6 is preferred because it contains F and K (corresponding to element A) that constitute fluoride phosphors in addition to Mn.

[0034] Particularly preferred sources (other than hydrofluoric acid in hydrofluoric acid) include K2SiF6 and K2MnF6.

[0035] ·Precipitation process The solution prepared in the dissolving process is poured into a large amount of water. This causes the system to rapidly become supersaturated, and phosphor particles having the composition represented by general formula (1) are precipitated. At this time, it is preferable to appropriately control the pouring speed. If the pouring speed is inappropriate, particles of the desired shape may not be obtained. Although it depends on the scale of the system, for example, when 1 L of HF aqueous solution is used to prepare a solution in the dissolving step, it is preferable to add the solution to about 1 L to 2 L of ion-exchanged water at a rate of about 100 mL / s. After that, it is preferable to continue stirring for about 1 to 10 minutes.

[0036] (Manufacturing method 2) The manufacturing method 2 mainly includes a dissolving step, a Mn source introduction step, and a precipitation step. These steps will be described below. These steps can be performed at room temperature.

[0037] ·Dissolution process In the dissolving step, (i) a raw material containing element A (such as K), (ii) a raw material containing element M (preferably Si), (iii) a raw material containing F, etc. are usually dissolved in hydrofluoric acid (aqueous solution of HF). One raw material may serve as two or more of (i) to (iii). For example, K2SiF6 used in the examples serves as all of the raw materials (i) to (iii). The concentration of hydrogen fluoride in the hydrofluoric acid before dissolving the raw materials is preferably 50 to 60 mass %.

[0038] From the viewpoint of chemical stability, a compound of element A is preferable as the raw material containing element A. For example, an oxide, hydroxide, fluoride, or carbonate of element A can be used. The source material containing F can be a fluoride as a source material for other elements (A, M, Mn). F can also be supplied from hydrogen fluoride in hydrofluoric acid used as a solvent.

[0039] A particularly preferred source of material (other than hydrofluoric acid in hydrofluoric acid) for use in the dissolution step is K2SiF6.

[0040] ·Mn source input process In the Mn source introduction step, a raw material containing Mn is introduced into the solution obtained in the dissolution step, and the solution is stirred for, for example, about 1 second to 2 minutes until water is introduced into the system in the precipitation step described below.

[0041] Examples of raw materials containing Mn include hexafluoromanganates, permanganates, oxides (excluding permanganates), fluorides (excluding hexafluoromanganates), chlorides, sulfates, and nitrates. Among them, fluorides are preferred because they can efficiently substitute Mn for the Si site in the fluoride phosphor and provide good luminescence characteristics, and among fluorides, hexafluoromanganates are preferred. Examples of hexafluoromanganates include Na2MnF6, K2MnF6, and Rb2MnF6. In particular, K2MnF6 is preferred because it contains F and K (corresponding to element A) that constitute fluoride phosphors in addition to Mn.

[0042] ·Precipitation process In the precipitation step, an appropriate amount of water is added to the system as quickly as possible. This causes the system to rapidly become supersaturated, and phosphor particles having the composition represented by general formula (1) are precipitated. In this case, "as quickly as possible" refers to adding, depending on the scale of the system, preferably 1 L of water to the system in about 3 seconds, for example, when 1 to 2 L of hydrofluoric acid is used in the dissolution step. It is speculated that the operation of suddenly bringing the system into a supersaturated state in this way probably causes the crystal growth to become anisotropic, resulting in the formation of phosphor particles in the form of two connected plate-like phosphors.

[0043] (Common points for manufacturing methods 1 and 2) The phosphor particles obtained by manufacturing method 1 or 2 are collected by solid-liquid separation such as by filtration, and washed with an organic solvent such as methanol, ethanol, or acetone. If a fluoride phosphor is washed with water, some of it may be hydrolyzed to produce a brown manganese compound, which may deteriorate the properties of the phosphor. For this reason, it is preferable to use an organic solvent in the washing process. Furthermore, washing with hydrofluoric acid reaction solution several times before washing with an organic solvent can dissolve and remove trace amounts of impurities that have been generated. The concentration of hydrofluoric acid in the hydrofluoric acid reaction solution used for washing is preferably 5% by mass or more from the viewpoint of suppressing decomposition of the fluoride phosphor, and is preferably 60% by mass or less from the viewpoint of phosphor solubility. After the washing step, it is preferable to thoroughly evaporate the washing solution by drying. In addition, classification may be performed using a sieve with a specified mesh size, and coarse particles may be removed.

[0044] <Composite, light-emitting device> The composite of this embodiment includes the above-mentioned phosphor particles and a sealant that seals the phosphor particles. Moreover, the light emitting device of the present embodiment includes a light emitting element that emits excitation light, and the above-mentioned composite that converts the wavelength of the excitation light. The light emitting device of this embodiment is preferably used as, for example, a backlight for a display.

[0045] An example of the composite and the light emitting device will be described below with reference to FIG.

[0046] FIG. 3 is a schematic diagram of a light emitting device 100. As shown in FIG. The light emitting device 100 includes a composite 10 and a light emitting element 20. The composite 10 is provided in contact with an upper portion of the light emitting element 20. The light emitting element 20 is typically a blue LED. Terminals are provided on the bottom of the light emitting element 20. When the terminals are connected to a power source, the light emitting element 20 can emit light. The excitation light emitted from the light emitting element 20 is wavelength converted by the complex 10. When the excitation light is blue light, the blue light is wavelength converted to red light by the complex 10 containing phosphor particles.

[0047] The composite 10 can be composed of the above-mentioned phosphor particles and a sealant that seals the phosphor powder. The composite 10 may further contain phosphor particles other than the above-mentioned phosphor particles. As the sealing material, for example, various curable resin materials (materials that are cured by heat and / or light) can be used. Any curable resin material can be used as long as it is sufficiently transparent and can provide the optical properties required for a display or lighting device. Examples of the sealing material include silicone resin materials. Regarding silicone resin materials, curable materials are supplied by Toray Dow Corning Co., Ltd., Shin-Etsu Chemical Co., Ltd., etc., and silicone resin materials are preferable from the viewpoints of high transparency and excellent heat resistance. In addition, examples of the sealing material include epoxy resin materials and urethane resin materials. The amount of phosphor particles (including the above-mentioned phosphor particles and phosphor particles other than the above-mentioned phosphor particles) in the composite 10 is, for example, 10 to 70 mass %, preferably 25 to 55 mass %.

[0048] There is no particular limitation on the size or shape of the light-emitting element 20. Depending on the application of the light-emitting device 100, the light-emitting element 20 can be of any size or shape.

[0049] Although the embodiments of the present invention have been described above, these are merely examples of the present invention, and various configurations other than those described above can be adopted. Furthermore, the present invention is not limited to the above-described embodiments, and modifications and improvements within the scope of the present invention are included in the present invention. EXAMPLES

[0050] The embodiments of the present invention will be described in detail based on Examples and Comparative Examples. It should be noted that the present invention is not limited to the Examples.

[0051] <Raw materials> The following raw materials were used: HF: Aqueous solution with a concentration of 55% by mass manufactured by Stella Chemifa Corporation K2SiF6: manufactured by Morita Chemical Co., Ltd. K2MnF6: Prepared by the method described in paragraph 0042 of JP2019-001897A

[0052] <Production of phosphor particles> Example 1 The phosphor particles were produced according to the following procedure. (1) At room temperature, 650 g of K2SiF and 66 g of K2MnF were simultaneously added to 1,000 mL of an aqueous HF solution with a concentration of 55% by mass contained in a Teflon (registered trademark) beaker, and the mixture was stirred for 40 seconds. (2) The liquid obtained in (1) above was poured into 1500 mL of ion-exchanged water in a Teflon (registered trademark) beaker at a rate of 100 mL / s. After the entire amount was poured, the mixture was stirred for 5 minutes.

[0053] After the stirring was completed, the solution was left to stand to precipitate the yellow solids. After the precipitation was confirmed, the supernatant was removed, and the yellow solids were washed with hydrofluoric acid having a concentration of 24% by mass, and then washed with methanol. The washed solids were filtered to separate and recover the solids, and further dried to evaporate and remove the remaining methanol. After the drying process, a nylon sieve with a mesh size of 75 μm was used to classify and recover only the yellow powder that passed through the sieve. In this manner, a phosphor powder was obtained.

[0054] Observation with an electron microscope confirmed that the obtained phosphor powder contained phosphor particles that included a first plate-like portion and a second plate-like portion that was at least partially connected to the first plate-like portion, as shown in Figure 4, and the first and second plate-like portions were not parallel to each other. In the phosphor particle of FIG. 4, the angle between the first plate-shaped portion and the second plate-shaped portion was approximately 45°. In the phosphor particle of FIG. 4, the thickness of the first plate-shaped portion and the second plate-shaped portion was approximately 1 μm. Moreover, the major axis of the phosphor particles obtained from FIG. 4 was approximately 30 μm. Also, from FIG. 4, it was determined that the first plate-shaped portion and the second plate-shaped portion were connected at their respective ends.

[0055] Example 2 The phosphor particles were produced according to the following procedure. (1) At room temperature, 675 g of K2SiF was added to 1500 mL of a 55% by mass HF aqueous solution contained in a Teflon (registered trademark) beaker and stirred for 10 minutes. This produced a homogeneous solution. (2) 69 g of K2MnF was added to the solution obtained in (1) above and stirred for 1 minute. (3) After (2) above, 1000 mL of ion-exchanged water was poured into the beaker at a rate of 333 mL / s. This caused the precipitation of a yellow solid to begin. Stirring was then continued for 5 minutes.

[0056] Thereafter, collection and washing of the precipitate were carried out in the same manner as in Example 1. Then, a phosphor powder was obtained.

[0057] Observation with an electron microscope confirmed that the obtained phosphor powder contained phosphor particles that included a first plate-like portion and a second plate-like portion that was at least partially connected to the first plate-like portion, as shown in Figure 5, and the first plate-like portion and the second plate-like portion were not parallel to each other. In the phosphor particle of FIG. 5, the angle between the first plate-shaped portion and the second plate-shaped portion was approximately 30°. In the phosphor particle of FIG. 5, the thickness of the first plate-shaped portion and the second plate-shaped portion was approximately 5 μm. Moreover, the major axis of the phosphor particles obtained from FIG. 5 was approximately 100 μm. Also, from FIG. 5, it was determined that the first plate-shaped portion and the second plate-shaped portion were connected at their respective ends.

[0058] Comparative Example 1 With reference to the description in Patent Document 2 (WO 2009 / 119486), phosphor particles were obtained according to the following procedure. The following procedure was carried out at room temperature. (1) First, 100 mL of an aqueous HF solution (46-48%), 6 g of KMnO4, and 100 mL of H2O were mixed to obtain a solution. (2) 0.38 g of a Si wafer having a thickness of 0.635 mm cut from an n-type dummy wafer was placed in the above solution and allowed to stand for 48 hours. (3) After the solution was left to stand, the supernatant was removed, and the remaining solid matter (precipitated crystals and the undissolved Si wafer) was washed with methanol. The undissolved Si wafer was then manually removed. In this manner, a phosphor powder was obtained.

[0059] An electron microscope image of the obtained phosphor particle is shown in Figure 6. In Comparative Example 1, it was not possible to produce a phosphor particle in which two plate-like portions were connected to each other.

[0060] <Identification: Crystal phase measurement, composition measurement, etc.> For the phosphor powder containing the phosphor particles obtained in each example, an X-ray diffraction pattern was obtained using an X-ray diffractometer. The obtained X-ray diffraction pattern was the same as that of K2SiF6 crystal. From this, it was confirmed that K2SiF6:Mn was obtained in a single phase.

[0061] <Evaluation of light emission characteristics (quantum efficiency, etc.)> A standard reflector (Spectralon, product name, manufactured by Labsphere) with a reflectance of 99% was set at the side opening (φ10 mm) of an integrating sphere (φ60 mm). Monochromatic light, which was split into 455 nm wavelengths from a light emission source (Xe lamp), was introduced into this integrating sphere via an optical fiber, and the spectrum of the reflected light was measured with a spectrophotometer (MCPD-7000, product name, manufactured by Otsuka Electronics Co., Ltd.). At this time, the number of excitation light photons (Qex) was calculated from the spectrum in the wavelength range of 450 to 465 nm. Next, the phosphor powder obtained in each Example was filled in a concave cell so that the surface was smooth, and the cell was set in the opening of an integrating sphere, and monochromatic light with a wavelength of 455 nm was irradiated, and the excitation reflected light and fluorescence spectra were measured by a spectrophotometer. The number of excitation reflected light photons (Qref) and the number of fluorescence photons (Qem) were calculated from the obtained spectrum data. The number of excitation reflected light photons was calculated in the same wavelength range as the number of excitation light photons, and the number of fluorescence photons was calculated in the range of 465 to 800 nm. From the obtained three types of photon counts, the absorptance at a wavelength of 455 nm (=(Qex-Qref) / Qex×100), internal quantum efficiency (=Qem / (Qex-Qref)×100), and external quantum efficiency (=Qem / Qex×100) were calculated.

[0062] The above results are summarized in the table.

[0063] [Table 1]

[0064] The evaluation results of Examples 1 and 2 were good.

[0065] This application claims priority based on Japanese Patent Application No. 2021-052751, filed on March 26, 2021, the disclosure of which is incorporated herein in its entirety. [Explanation of symbols]

[0066] 1. First plate-shaped portion 2 Second plate-shaped part 10 Complex 20 Light emitting element 100 Light emitting device

Claims

1. A phosphor particle having a composition represented by the following general formula (1): A phosphor particle comprising a first plate-shaped portion and a second plate-shaped portion at least partially connected to the first plate-shaped portion, the first plate-shaped portion and the second plate-shaped portion being not parallel to each other. General formula (1): A ２ MF ６ :Mn In general formula (1), Element A is one or more alkali metal elements containing K, The element M is Si alone, Ge alone, or a combination of Si with one or more elements selected from the group consisting of Ge, Sn, Ti, Zr, and Hf.

2. 2. The phosphor particle according to claim 1 , The angle between the first plate-like portion and the second plate-like portion is an acute angle.

3. 3. The phosphor particle according to claim 1, A phosphor particle, wherein the first plate-like portion and / or the second plate-like portion has a thickness of 20 μm or less.

4. The phosphor particle according to any one of claims 1 to 3, A phosphor particle having a major axis of 1 μm or more and 150 μm or less as determined from an image of the phosphor particle taken by an electron microscope.

5. The phosphor particle according to any one of claims 1 to 4, The first plate-shaped portion and the second plate-shaped portion are connected at their respective ends.

6. 6. A composite comprising: the phosphor particle according to claim 1; and a sealing material that seals the phosphor particle.

7. A light emitting device comprising: a light emitting element that emits excitation light; and the composite according to claim 6 that converts the wavelength of the excitation light.

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