Wavelength conversion member, method for manufacturing the same, and light-emitting device

Abstract

The present invention provides a wavelength conversion member that can efficiently extract light of a desired chromaticity. [Solution] A wavelength conversion member 1 having opposing first main surface 1a and second main surface 1b, comprising an inorganic matrix 2 and inorganic phosphor particles 3 dispersed in the inorganic matrix 2 having an average aspect ratio of 2 or more, wherein the average orientation angle of the inorganic phosphor particles 3 with respect to the direction along the first main surface 1a of the wavelength conversion member 1 is 0° or more and 45° or less.

Description

[Technical Field]

[0001] The present invention relates to a wavelength conversion member, a method for manufacturing the wavelength conversion member, and a light-emitting device using the wavelength conversion member. [Background technology]

[0002] Conventionally, light-emitting devices using light-emitting elements such as light-emitting diodes (LEDs) and laser diodes (LDs) are widely known. As an example of such a light-emitting device, Patent Document 1 below discloses a light-emitting device in which a wavelength conversion member is arranged on an LED that emits blue light, and absorbs a portion of the light from the LED and converts it into yellow light. This light-emitting device emits white light, which is the composite light of the blue light emitted from the LED and the yellow light emitted from the wavelength conversion member. [Prior art documents] [Patent Documents]

[0003] [Patent Document 1] Japanese Patent Publication No. 2000-208815 [Overview of the Initiative] [Problems that the invention aims to solve]

[0004] As mentioned above, light-emitting devices sometimes use composite light, which is a combination of excitation light emitted from a light source and passing through a wavelength conversion component, and fluorescence emitted from a phosphor contained in the wavelength conversion component. Alternatively, light-emitting devices may use fluorescence itself, such as in light-emitting devices that emit amber light, emitted from a phosphor contained in the wavelength conversion component. When fluorescence itself is used, the wavelength conversion component needs to efficiently convert the excitation light into fluorescence. However, if the concentration of phosphor contained in the wavelength conversion component is increased for the purpose of efficiently converting excitation light into fluorescence, the proportion of the interface between the inorganic matrix constituting the wavelength conversion component and the phosphor also increases, leading to excessive scattering and making it difficult to efficiently extract light from the wavelength conversion component.

[0005] The object of the present invention is to provide a wavelength conversion member that can efficiently extract light of a desired chromaticity, a method for manufacturing the wavelength conversion member, and a light-emitting device using the wavelength conversion member. [Means for solving the problem]

[0006] The following describes a wavelength conversion member that solves the above problems, a method for manufacturing the wavelength conversion member, and various embodiments of a light-emitting device using the wavelength conversion member.

[0007] A wavelength conversion member according to embodiment 1 of the present invention is a wavelength conversion member having a first main surface and a second main surface facing each other, comprising an inorganic matrix and inorganic phosphor particles dispersed in the inorganic matrix having an average aspect ratio of 2 or more, characterized in that the average orientation angle of the inorganic phosphor particles with respect to the direction along the first main surface of the wavelength conversion member is 0° or more and 45° or less.

[0008] The wavelength conversion member according to aspect 2 of the present invention is a wavelength conversion member having opposing first and second main surfaces, comprising an inorganic matrix and inorganic phosphor particles having an average aspect ratio of 2 or more and dispersed in the inorganic matrix, and when observing an image of a cross-section orthogonal to the first main surface of the wavelength conversion member, in the frequency distribution of the orientation angle of the inorganic phosphor particles with respect to the direction along the first main surface of the wavelength conversion member, the ratio of the total frequency at orientation angles of 0° to 30° and 150° to 180° to the overall frequency is 40% or more.

[0009] The wavelength conversion member according to aspect 3 is preferably such that, in aspect 1 or aspect 2, the inorganic phosphor particles are nitride phosphor particles or oxynitride phosphor particles.

[0010] The wavelength conversion member according to aspect 4 is preferably such that, in any one of aspects 1 to 3, the inorganic phosphor particles have an excitation band between wavelengths of 300 nm and 500 nm and an emission peak between wavelengths of 500 nm and 780 nm.

[0011] The wavelength conversion member according to aspect 5 is preferably such that, in any one of aspects 1 to 4, the content of the inorganic phosphor particles in the inorganic matrix is 5% by mass or more and 65% by mass or less.

[0012] The wavelength conversion member according to aspect 6 is preferably such that, in any one of aspects 1 to 5, the inorganic matrix is composed of glass or ceramics.

[0013] The wavelength conversion member according to aspect 7 is preferably such that, in any one of aspects 1 to 6, the thickness of the wavelength conversion member is 0.01 mm or more and 2.0 mm or less.

[0014] A method for manufacturing a wavelength conversion member according to aspect 8 of the present invention is a method for manufacturing a wavelength conversion member according to any one of aspects 1 to 7, characterized by comprising the steps of: preparing a slurry containing inorganic particles that form the inorganic matrix and inorganic phosphor particles; applying the slurry onto a support substrate to form a green sheet; and obtaining a wavelength conversion member by firing the green sheet.

[0015] A light-emitting device according to aspect 9 of the present invention is characterized by comprising a wavelength conversion member according to any one of aspects 1 to 7, and a light source that emits excitation light to the wavelength conversion member. [Effects of the Invention]

[0016] According to the present invention, it is possible to provide a wavelength conversion member that can efficiently extract light of a desired chromaticity, a method for manufacturing the wavelength conversion member, and a light-emitting device using the wavelength conversion member. [Brief explanation of the drawing]

[0017] [Figure 1] Figure 1 is a schematic cross-sectional view showing a wavelength conversion member according to a first embodiment of the present invention. [Figure 2] Figure 2 is a schematic diagram illustrating the orientation of inorganic phosphor particles dispersed in the inorganic matrix in the wavelength conversion member shown in Figure 1. [Figure 3] Figure 3 is a schematic diagram illustrating a method for efficiently irradiating inorganic phosphor particles with excitation light. [Figure 4] Figure 4 is a schematic cross-sectional view showing a wavelength conversion member according to a second embodiment of the present invention. [Figure 5] Figure 5 is a schematic cross-sectional view showing a light-emitting device according to a third embodiment of the present invention. [Figure 6] Figure 6 is a schematic cross-sectional view showing a light-emitting device according to a fourth embodiment of the present invention. [Modes for carrying out the invention]

[0018] Preferred embodiments are described below. However, the following embodiments are merely illustrative, and the present invention is not limited to these embodiments. In addition, in each drawing, components having substantially the same function may be referred to by the same reference numerals.

[0019] [Wavelength conversion component] (First embodiment) Figure 1 is a schematic cross-sectional view showing a wavelength conversion member according to a first embodiment of the present invention. Figure 2 is a schematic diagram illustrating the orientation state of inorganic phosphor particles dispersed in the inorganic matrix in the wavelength conversion member of Figure 1.

[0020] As shown in Figure 1, the wavelength conversion member 1 has a first main surface 1a and a second main surface 1b facing each other. In this embodiment, the first main surface 1a of the wavelength conversion member 1 is the light incident surface on which the excitation light A emitted from the light source 10 enters the wavelength conversion member 1. The second main surface 1b of the wavelength conversion member 1 is the light emission surface on which the fluorescence B is emitted from the wavelength conversion member 1.

[0021] In this embodiment, the wavelength conversion member 1 has a rectangular plate shape. However, the shape of the wavelength conversion member 1 is not particularly limited, and for example, it may have a disc shape. The first main surface 1a of the wavelength conversion member 1 may be the light incident surface and does not necessarily have to be planar. The second main surface 1b of the wavelength conversion member 1 may be the light emission surface and does not necessarily have to be planar.

[0022] As shown in Figure 2, the wavelength conversion member 1 comprises an inorganic matrix 2 and inorganic phosphor particles 3. In the wavelength conversion member 1, the inorganic phosphor particles 3 are dispersed in the inorganic matrix 2. Note that the inorganic phosphor particles 3 are not shown in Figure 1.

[0023] As shown in Figure 1, in the wavelength conversion member 1, excitation light A emitted from the light source 10 enters the wavelength conversion member 1 from the first main surface 1a side. The excitation light A that enters the wavelength conversion member 1 is irradiated onto inorganic phosphor particles 3 contained within the wavelength conversion member 1. The excitation light A irradiated onto the inorganic phosphor particles 3 is converted to a different wavelength by the inorganic phosphor particles 3 and is emitted from the second main surface 1b side of the wavelength conversion member 1 as fluorescence B having the emission peak wavelength of the inorganic phosphor particles 3.

[0024] The inorganic matrix 2 is a matrix that serves as a dispersion medium for the inorganic phosphor particles 3. In this embodiment, since the wavelength conversion member 1 is constructed by dispersing inorganic phosphor particles 3 in the inorganic matrix 2, the inorganic matrix 2 has a shape that corresponds to the shape of the wavelength conversion member 1.

[0025] The average aspect ratio of the inorganic phosphor particles 3 is 2 or greater. In this specification, the aspect ratio of the inorganic phosphor particles 3 can be determined from the ratio of the length dimension of the inorganic phosphor particles 3 to the dimension perpendicular to the length dimension. Depending on the shape of the inorganic phosphor particles 3, the aspect ratio of the inorganic phosphor particles 3 may be determined from the ratio of the length to the diameter, from the ratio of the major axis to the minor axis, or from the ratio of the length to the thickness of the inorganic phosphor particles 3. The average aspect ratio of the inorganic phosphor particles 3 can be determined, for example, from the average of the aspect ratios of 100 inorganic phosphor particles 3.

[0026] In this embodiment, the inorganic phosphor particles 3 have a rod-like shape. The shape of the inorganic phosphor particles 3 is not particularly limited as long as the average aspect ratio is 2 or more, and may be, for example, needle-shaped, prismatic, spindle-shaped, array-shaped, semicircular, etc.

[0027] In the first invention of this application, the average orientation angle of the inorganic phosphor particles 3 with respect to the direction along the first main surface 1a of the wavelength conversion member 1 is 0° or more and 45° or less.

[0028] The direction along the first main surface 1a of the wavelength conversion member 1 refers to the direction parallel to the first main surface 1a of the wavelength conversion member 1 (the x-direction in Figure 1). However, if the first main surface 1a of the wavelength conversion member 1 is not a plane and it is difficult to specify a direction parallel to the first main surface 1a, it may be defined as the direction perpendicular to the direction in which the excitation light A is incident on the first main surface 1a (the z-direction in Figure 1). Furthermore, the orientation angle of the inorganic phosphor particles 3 refers to the orientation angle in the longitudinal direction of the inorganic phosphor particles 3.

[0029] The average orientation angle of the inorganic phosphor particles 3 can be determined, for example, by observing an image of a cross-section perpendicular to the first main surface 1a of the wavelength conversion member 1 and measuring the orientation angle of the inorganic phosphor particles 3 in the observed image. The average orientation angle of the inorganic phosphor particles 3 can be determined, for example, from the average orientation angle of 100 inorganic phosphor particles 3.

[0030] In the first invention, since the average orientation angle of the inorganic phosphor particles 3 is within the above range, light of the desired chromaticity can be efficiently extracted.

[0031] Conventionally, light-emitting devices sometimes use composite light, which is a combination of excitation light emitted from a light source and passing through a wavelength conversion member, and fluorescence emitted from a phosphor contained in the wavelength conversion member. Alternatively, light-emitting devices may use fluorescence itself, such as in light-emitting devices that emit amber light, emitted from a phosphor contained in the wavelength conversion member. In such cases where fluorescence itself is used, it is necessary for the wavelength conversion member to efficiently convert the excitation light into fluorescence. However, if the concentration of phosphor contained in the wavelength conversion member is increased for the purpose of efficiently converting excitation light into fluorescence, the proportion of the interface between the inorganic matrix constituting the wavelength conversion member and the phosphor also increases, leading to excessive scattering and making it difficult to efficiently extract light from the wavelength conversion member.

[0032] In contrast, in the first invention, the average orientation angle of the inorganic phosphor particles 3 is within the above range, and more inorganic phosphor particles 3 are oriented so as to approach the direction along the first main surface 1a of the wavelength conversion member 1, that is, the direction perpendicular to the direction in which the excitation light A is incident. Therefore, the excitation light A is efficiently incident on the inorganic phosphor particles 3, and fluorescence B can be efficiently extracted from the wavelength conversion member 1.

[0033] Furthermore, the reason why the excitation light A efficiently incidents on the inorganic phosphor particles 3 when more of the inorganic phosphor particles 3 are oriented so as to approach a direction perpendicular to the direction in which the excitation light A is incident can be explained as follows.

[0034] As in this embodiment, when inorganic phosphor particles 3 are dispersed in an inorganic matrix 2, some of the excitation light A is reflected without entering the inorganic phosphor particles 3 due to the difference in refractive index between the inorganic matrix 2 and the inorganic phosphor particles 3. Here, as shown in Figure 3, if we consider Fresnel's formula, and let θ be the angle between the direction in which the excitation light A enters the inorganic phosphor particles 3 and the direction perpendicular to the length direction of the inorganic phosphor particles 3, then as θ increases, the reflectivity of the excitation light A increases, making it more difficult for the excitation light A to enter the inorganic phosphor particles 3. On the other hand, as θ decreases, the reflectivity of the excitation light A decreases, making it easier for the excitation light A to enter the inorganic phosphor particles 3. As in this embodiment, if more inorganic phosphor particles 3 are oriented so as to approach the direction perpendicular to the direction in which the excitation light A enters, θ will decrease, and it is thought that the excitation light A can be efficiently incident on the inorganic phosphor particles 3. Furthermore, as the reflectance of excitation light A increases, the light transmittance of the wavelength conversion member 1 decreases, and the extraction efficiency of fluorescence B also decreases. Therefore, if the inorganic phosphor particles 3 are oriented so as to be perpendicular to the direction in which the excitation light A is incident, fluorescence B can be extracted efficiently.

[0035] Furthermore, in the first invention, the average orientation angle of the inorganic phosphor particles 3 is within the above range, and more inorganic phosphor particles 3 are oriented so as to approach the direction perpendicular to the direction in which the excitation light A is incident. Therefore, the excitation light A can be shielded more efficiently by the inorganic phosphor particles 3. As a result, fluorescence B can be extracted more selectively from the wavelength conversion member 1, and light having the chromaticity of fluorescence B itself can be extracted. Consequently, when it is desired to extract light having the chromaticity of fluorescence B itself from the wavelength conversion member 1, light having the desired chromaticity can be extracted. Thus, according to the first invention, light having the desired chromaticity can be efficiently extracted from the wavelength conversion member 1.

[0036] In the first invention, the average orientation angle of the inorganic phosphor particles 3 is 0° or more and 45° or less, preferably 40° or less, more preferably 25° or less, and even more preferably 10° or less. When the average orientation angle of the inorganic phosphor particles 3 is within the above range, light of the desired chromaticity can be extracted from the wavelength conversion member 1 more efficiently.

[0037] In the second invention of this application, when an image of a cross-section perpendicular to the first main surface 1a of the wavelength conversion member 1 is observed, the ratio of the total frequency of orientation angles of inorganic phosphor particles 3 with respect to the direction along the first main surface 1a of the wavelength conversion member 1 to the total frequency of orientation angles of 0° to 30° and 150° to 180° is 40% or more.

[0038] In this specification, image observation of a cross-section perpendicular to the first main surface 1a of the wavelength conversion member 1 can be performed using a scanning electron microscope (SEM). The frequency distribution of the orientation angle of the inorganic phosphor particles 3 can be obtained by image analysis using SEM images.

[0039] In the second invention, in the frequency distribution of orientation angles of the inorganic phosphor particles 3, the ratio of the total frequency of orientation angles from 0° to 30° and 150° to 180° to the total frequency is greater than or equal to the lower limit, and more inorganic phosphor particles 3 are oriented in a direction that approaches the direction along the first main surface 1a of the wavelength conversion member 1, that is, the direction perpendicular to the direction in which the excitation light A is incident. Therefore, the excitation light A is efficiently incident on the inorganic phosphor particles 3, and fluorescence B can be efficiently extracted from the wavelength conversion member 1.

[0040] Furthermore, in the second invention, in the frequency distribution of orientation angles of the inorganic phosphor particles 3, the ratio of the total frequency of orientation angles from 0° to 30° and 150° to 180° to the total frequency is greater than or equal to the lower limit, and more inorganic phosphor particles 3 are oriented so as to approach the direction perpendicular to the direction in which the excitation light A is incident, thus enabling more efficient shielding of the excitation light A. As a result, fluorescence B can be extracted more selectively from the wavelength conversion member 1, and light having the chromaticity of fluorescence B itself can be extracted. Therefore, when it is desired to extract light having the chromaticity of fluorescence B itself from the wavelength conversion member 1, light having the desired chromaticity can be extracted. Thus, the second invention also enables efficient extraction of light having the desired chromaticity from the wavelength conversion member 1.

[0041] In the second invention, in the frequency distribution of orientation angles of the inorganic phosphor particles 3, the ratio of the total frequency of orientation angles between 0° and 30° and 150° and 180° to the total frequency is 40% or more, preferably 100% or less, preferably 45% or more, more preferably 50% or more, and even more preferably 60% or more. When the ratio of the total frequency of orientation angles between 0° and 30° and 150° and 180° to the total frequency is within the above range, light of the desired chromaticity can be extracted more efficiently.

[0042] The first and second inventions of this application may be implemented individually or in combination. Hereinafter, the first and second inventions of this application may be collectively referred to as the "present invention."

[0043] The following provides a more detailed explanation of each component that makes up the wavelength conversion member 1.

[0044] inorganic matrix; The inorganic matrix 2 is preferably transparent. The light transmittance of the inorganic matrix 2 at wavelengths from 380 nm to 780 nm and a thickness of 0.2 mm is preferably 50% or more, more preferably 75% or more. The upper limit of the above light transmittance is not particularly limited, but in reality it is 100% or less.

[0045] The inorganic matrix 2 can be composed of, for example, glass or ceramics. Examples of glass that constitutes the inorganic matrix 2 include borosilicate glass, phosphate glass, tin phosphate glass, bismuthate glass, or tellurite glass. Examples of ceramics that constitute the inorganic matrix 2 include Al2O3, MgO, or AlN. The inorganic matrix 2 may also be composed of other materials such as glass ceramics.

[0046] When the inorganic matrix 2 is a glass matrix, it is preferable that the glass matrix is ​​a glass with a low alkali metal content. Specifically, the content of Li2O+Na2O+K2O in the glass matrix is ​​preferably 0% to 10%, more preferably 0% to 5%, and even more preferably 0% to 3% in mole percent. In this case, it is possible to suppress the formation of colored centers that serve as absorption sources for excitation light A and fluorescence B in the glass matrix, and to suppress the decrease in the emission intensity of light emitted from the wavelength conversion member 1. Furthermore, in this case, it is also possible to suppress the deterioration of the glass matrix over time under high temperature and high humidity conditions.

[0047] The softening point of the glass matrix is ​​preferably 250°C to 1000°C, more preferably 300°C to 950°C, and even more preferably 500°C to 900°C.

[0048] The softening point of the glass matrix is ​​preferably 500°C or higher, more preferably 550°C or higher, even more preferably 600°C or higher, even more preferably 650°C or higher, even more preferably 700°C or higher, even more preferably 750°C or higher, particularly preferably 800°C or higher, and most preferably 820°C or higher. Examples of glass constituting such a glass matrix include borosilicate glass. When the softening point of the glass matrix is ​​above the above lower limit, the mechanical strength and chemical durability of the wavelength conversion member 1 can be further improved. In this case, the heat resistance of the glass matrix itself can be further improved, and the softening deformation of the glass matrix due to the heat generated from the inorganic phosphor particles 3 can be further suppressed.

[0049] Furthermore, the softening point of the glass matrix is ​​preferably 900°C or lower, more preferably 850°C or lower, even more preferably 840°C or lower, even more preferably 830°C or lower, even more preferably 820°C or lower, even more preferably 810°C or lower, even more preferably 800°C or lower, even more preferably 790°C or lower, even more preferably 780°C or lower, even more preferably 760°C or lower, even more preferably 750°C or lower, even more preferably 700°C or lower, even more preferably 650°C or lower, even more preferably 600°C or lower, even more preferably 550°C or lower, even more preferably 530°C or lower, even more preferably 500°C or lower, particularly preferably 480°C or lower, and most preferably 460°C or lower. Examples of glass constituting such a glass matrix include borosilicate glass, tin phosphate glass, bismuthate glass, or tellurite glass. When the softening point of the glass matrix is ​​below the above upper limit, the firing temperature during the manufacture of the wavelength conversion member 1 can be further reduced, thereby suppressing the manufacturing cost of the wavelength conversion member 1. Furthermore, in this case, the degradation of inorganic phosphor particles 3 due to the firing process during the manufacturing of the wavelength conversion member 1 is suppressed, which further reduces the decrease in the emission intensity of light emitted from the wavelength conversion member 1.

[0050] Inorganic phosphor particles; The average aspect ratio of the inorganic phosphor particles 3 is 2 or more. Preferably, the average aspect ratio of the inorganic phosphor particles 3 is 3 or more, more preferably 4 or more, even more preferably 6 or more, and preferably 20 or less. When the average aspect ratio of the inorganic phosphor particles 3 is equal to or greater than the above lower limit, light having the desired chromaticity can be extracted from the wavelength conversion member 1 more efficiently.

[0051] The lengthwise dimension of the inorganic phosphor particle 3 is preferably 5 μm or more, more preferably 10 μm or more, preferably 40 μm or less, and more preferably 20 μm or less. Furthermore, the dimension of the inorganic phosphor particle 3 in the direction perpendicular to the lengthwise direction is preferably 1 μm or more, more preferably 2 μm or more, preferably 20 μm or less, and more preferably 10 μm or less.

[0052] The inorganic phosphor particles 3 are not particularly limited as long as they have an average aspect ratio of 2 or more. For example, oxide phosphors (including garnet-based phosphors such as YAG phosphors), nitride phosphors, oxynitride phosphors, chloride phosphors, acid chloride phosphors, halide phosphors, aluminate phosphors, or halophosphate chloride phosphors can be used. Among these, the inorganic phosphor particles 3 are preferably nitride-based phosphor particles or oxynitride phosphors, from the viewpoint of ease in selecting inorganic phosphor particles 3 with an average aspect ratio of 2 or more. Nitride phosphor particles and oxynitride phosphor particles have the characteristic of converting excitation light from near-ultraviolet to blue into a wide wavelength range from green to red, and also have a relatively high emission intensity. Other inorganic phosphor particles 3 include sulfide phosphors, but sulfide phosphors tend to degrade over time or react with the inorganic matrix 2, causing a decrease in emission intensity, so it is preferable not to use them in this invention.

[0053] As the inorganic phosphor particles 3, phosphor particles coated with a coating material such as an oxide may be used. In this case, the activation of the movement of electrons, holes, or alkali ions in the inorganic matrix 2 can be suppressed, and as a result, the formation of color centers can be suppressed. Also, in this case, the conduction of heat generated from the inorganic phosphor particles 3 to the inorganic matrix 2 can be suppressed.

[0054] As the inorganic phosphor particles 3, particles having an excitation band between wavelengths of 300 nm and 500 nm and a light emission peak between wavelengths of 500 nm and 780 nm can be preferably used, and particularly, particles having a light emission peak of green (wavelength 500 nm to 540 nm), yellow (wavelength 540 nm to 595 nm), or red (wavelength 600 nm to 700 nm) can be preferably used.

[0055] Examples of the inorganic phosphor particles 3 having an excitation band between wavelengths of 300 nm and 440 nm, which is an ultraviolet to near-ultraviolet wavelength range, and having a green light emission peak include SrAl2O4:Eu 2+ , SrBaSiO4:Eu 2+ , Y3(Al,Gd)5O 12 :Ce 3+ , SrSiON:Eu 2+ , BaMgAl 10 O 17 :Eu 2+ ,Mn 2+ , Ba2MgSi2O7:Eu 2+ , Ba2SiO4:Eu 2+ , Ba2Li2Si2O7:Eu 2+ , BaAl2O4:Eu 2+ and the like.

[0056] Examples of the inorganic phosphor particles 3 having an excitation band between wavelengths of 440 nm and 480 nm, which is a blue wavelength range, and having a green light emission peak include SrAl2O4:Eu 2+ , Lu3Al5O 12 :Ce, SrBaSiO4:Eu 2+ , Y3(Al,Gd)5O 12 :Ce 3+ , SrSiON:Eu 2+ , β-SiAlON:Eu 2+These are some examples.

[0057] As an inorganic phosphor particle 3 having an excitation band in the ultraviolet to near-ultraviolet wavelength range of 300 nm to 440 nm and a yellow emission peak, La3Si6N is used. 11 :Ce 3+ These are some examples.

[0058] As an inorganic phosphor particle 3 having an excitation band in the blue wavelength range of 440 nm to 480 nm and a yellow emission peak, Y3(Al,Gd)5O 12 :Ce 3+ Lu3Al5O 12 :Ce,Sr2SiO4:Eu 2+ These are some examples.

[0059] As an inorganic phosphor particle 3 having an excitation band in the ultraviolet to near-ultraviolet wavelength range of 300 nm to 440 nm and a red emission peak, MgSr3Si2O8:Eu 2+ ,Mn 2+ Ca2MgSi2O7:Eu 2+ ,Mn 2+ These are some examples.

[0060] As an inorganic phosphor particle 3 having an excitation band in the blue wavelength range of 440 nm to 480 nm and a yellow to red, so-called amber emission peak, CaAlSiN3:Eu 2+ (CASN), (Ca,Sr)AlSiN3:Eu 2+ (SCASN), CaSiN3:Eu 2+ (Ca,Sr)2Si5N8:Eu 2+ α-SiAlON:Eu 2+ Ba2Si5N8:Eu 2+ Examples include Ce-activated CALSON phosphors. In particular, the inorganic phosphor particle 3 is preferably α-SiAlON.

[0061] When the inorganic matrix 2 is a glass matrix, the refractive index of the inorganic phosphor particles 3 is often higher than that of the glass matrix. In the wavelength conversion member 1, if the refractive index difference between the inorganic phosphor particles 3 and the glass matrix is ​​large, the excitation light A is more likely to scatter at the interface between the inorganic phosphor particles 3 and the glass matrix. As a result, the irradiation efficiency of the excitation light A to the inorganic phosphor particles 3 increases, and the luminescence efficiency of the inorganic phosphor particles 3 tends to improve. However, if the refractive index difference between the inorganic phosphor particles 3 and the glass matrix is ​​too large, the scattering of the excitation light A becomes excessive, resulting in scattering loss and conversely, the luminescence efficiency of the inorganic phosphor particles 3 tends to decrease.

[0062] Considering these factors, the refractive index difference between the inorganic phosphor particles 3 and the glass matrix is ​​preferably 0.001 to 0.6. Furthermore, the refractive index (nd) of the glass matrix is ​​preferably 1.45 to 1.8, more preferably 1.47 to 1.75, and even more preferably 1.48 to 1.7.

[0063] The content of inorganic phosphor particles 3 in the inorganic matrix 2 is preferably 5% by mass or more, more preferably 15% by mass or more, even more preferably 25% by mass or more, preferably 65% ​​by mass or less, more preferably 50% by mass or less, and even more preferably 35% by mass or less. When the content of inorganic phosphor particles 3 is above the lower limit, the emission intensity of light emitted from the wavelength conversion member 1 can be further increased. Also, when the content of inorganic phosphor particles 3 is below the upper limit, the proportion of the interface between the inorganic matrix 2 and the inorganic phosphor particles 3 can be reduced, so excessive scattering can be suppressed, and fluorescence B can be extracted from the wavelength conversion member 1 more efficiently.

[0064] Other additives; The inorganic matrix 2 may contain other additives in addition to the inorganic phosphor particles 3. Examples of other additives include light-diffusing materials such as alumina, silica, or titania. The content of other additives in the inorganic matrix 2 is not particularly limited as long as it does not hinder the effects of the present invention, but can be, for example, 3% by mass or less.

[0065] Wavelength conversion component; The thickness of the wavelength conversion member 1 is preferably 0.01 mm or more, more preferably 0.05 mm or more, even more preferably 0.075 mm or more, preferably 2.0 mm or less, more preferably 0.5 mm or less, and even more preferably 0.2 mm or less. When the thickness of the wavelength conversion member 1 is greater than or equal to the lower limit, the mechanical strength of the wavelength conversion member 1 can be further improved. Also, when the thickness of the wavelength conversion member 1 is less than or equal to the upper limit, light of the desired chromaticity can be extracted from the wavelength conversion member 1 more efficiently.

[0066] The wavelength conversion member 1 can be suitably used as a component of general lighting such as white LEDs, or special lighting (for example, projector light sources, automotive headlights, turn signals, and other automotive lighting).

[0067] The following describes an example of a method for manufacturing the wavelength conversion member 1.

[0068] Method for manufacturing wavelength conversion components; In the method for manufacturing the wavelength conversion member 1, first, a slurry is prepared containing inorganic particles that will form an inorganic matrix 2 and inorganic phosphor particles 3. The slurry may also contain organic components such as binders and solvents.

[0069] When using glass powder as inorganic particles, the maximum particle size D of the glass powder max The average particle size D of the glass powder is preferably 200 μm or less, more preferably 150 μm or less, and even more preferably 105 μm or less. 50 The particle size is preferably 0.1 μm or larger, more preferably 1 μm or larger, even more preferably 2 μm or larger, preferably 10 μm or smaller, more preferably 8 μm or smaller, and even more preferably 5 μm or smaller. Maximum particle size D of glass powder max and average particle diameter D 50 If the average particle size D of the glass powder is too large, the excitation light will be less likely to scatter in the resulting wavelength conversion member 1, and the luminescence efficiency will tend to decrease. 50If the maximum particle diameter D is too small, the excitation light will be excessively scattered in the resulting wavelength conversion member 1, which will easily reduce the luminescence efficiency. max and average particle diameter D 50 This refers to the value measured by laser diffraction.

[0070] Next, the prepared slurry is applied to the support substrate to form a green sheet. For example, a green sheet can be formed by applying a prepared slurry onto a support substrate and moving a doctor blade, which is positioned at a predetermined distance from the support substrate, relative to the slurry. As the support substrate, for example, a resin film such as polyethylene terephthalate can be used. The obtained green sheet may be used after heat drying, or multiple green sheets cut into a predetermined shape may be laminated and heat-pressed together to be used as a green sheet laminate.

[0071] Next, the prepared green sheet (or green sheet laminate) is fired to obtain the wavelength conversion member 1. The firing temperature of the green sheet is not particularly limited, but for example, when glass powder is used as inorganic particles, it is preferably above the softening point of the glass powder, more preferably higher than the softening point of the glass powder, and even more preferably above the softening point of the glass powder + 30°C. Furthermore, the firing temperature of the green sheet is not particularly limited, but is preferably below the softening point of the glass powder + 150°C, more preferably below the softening point of the glass powder + 100°C, even more preferably below the softening point of the glass powder + 90°C, even more preferably below the softening point of the glass powder + 80°C, even more preferably below the softening point of the glass powder + 70°C, even more preferably below the softening point of the glass powder + 60°C, even more preferably below the softening point of the glass powder + 50°C, even more preferably below the softening point of the glass powder + 40°C, even more preferably below the softening point of the glass powder + 30°C, even more preferably below the softening point of the glass powder + 20°C, particularly preferably below the softening point of the glass powder + 10°C, and most preferably below the softening point of the glass powder + 5°C. If the firing temperature of the green sheet is too low, the glass powder will not flow sufficiently, and it will be difficult to obtain a dense sintered body. On the other hand, if the firing temperature of the green sheet is too high, the inorganic phosphor particles 3, such as nitride phosphor particles and oxynitride phosphor particles, may degrade due to heat, or foaming may occur due to the reaction between the inorganic phosphor particles 3 and the glass powder, potentially reducing the light emission intensity and mechanical strength of the light emitted from the wavelength conversion member 1. Furthermore, if the firing temperature of the green sheet is too high, the inorganic phosphor particles 3 may dissolve into the glass matrix, reducing the light emission intensity of the light emitted from the wavelength conversion member 1, or the inorganic phosphor particles 3 may diffuse into the glass matrix, causing the glass matrix to become discolored and reducing the light emission intensity of the light emitted from the wavelength conversion member 1. The firing atmosphere for the green sheet is preferably a reduced pressure atmosphere, and more preferably a vacuum atmosphere. Alternatively, the firing atmosphere for the green sheet may be under atmospheric pressure or a nitrogen atmosphere.

[0072] In the method for manufacturing the wavelength conversion member 1, it is desirable to manufacture the wavelength conversion member 1 such that the average orientation angle of the inorganic phosphor particles 3 in the first invention and the ratio of the total frequency of orientation angles between 0° and 30° and 150° and 180° to the total frequency are within the above-mentioned preferred range. For example, when manufacturing the wavelength conversion member 1, the average orientation angle of the inorganic phosphor particles 3 and the ratio of the total frequency of orientation angles between 0° and 30° and 150° and 180° to the total frequency can be adjusted to the above-mentioned preferred range by optimizing the viscosity of the slurry, increasing the transport speed of the support substrate when forming the green sheet by the doctor blade method, or reducing the distance between the nozzle and the support substrate when forming the green sheet by the doctor blade method.

[0073] More specifically, when manufacturing the wavelength conversion member 1, the viscosity of the slurry is preferably 1 Pa·s or more, more preferably 3 Pa·s or more, preferably 100 Pa·s or less, and more preferably 50 Pa·s or less.

[0074] The transport speed of the support substrate when forming a green sheet by the doctor blade method is preferably 0.05 m / min or more, more preferably 0.1 m / min or more, preferably 2.0 m / min or less, and more preferably 1.0 m / min or less.

[0075] The distance between the nozzle and the support substrate when forming a green sheet by the doctor blade method is preferably 0.02 mm or more, more preferably 0.05 mm or more, preferably 1.0 mm or less, and more preferably 0.5 mm or less.

[0076] (Second embodiment) Figure 4 is a schematic cross-sectional view showing a wavelength conversion member according to a second embodiment of the present invention.

[0077] As shown in Figure 4, the wavelength conversion member 21 has a first main surface 21a and a second main surface 21b facing each other. In this embodiment, the first main surface 21a of the wavelength conversion member 21 is the light incident surface on which the excitation light A emitted from the light source 10 enters the wavelength conversion member 21. The second main surface 21b of the wavelength conversion member 21 is the light emission surface on which the fluorescence B is emitted from the wavelength conversion member 21.

[0078] The wavelength conversion member 21 comprises a wavelength conversion member body 22 and a filter layer 23. The wavelength conversion member body 22 is provided on the first main surface 21a side, which is the light incident surface of the wavelength conversion member 21. The filter layer 23 is provided on the second main surface 21b side, which is the light emission surface of the wavelength conversion member 21.

[0079] The wavelength conversion member body 22 has the same configuration as the wavelength conversion member 1 of the first embodiment. A filter layer 23 is provided on the main surface 22a of the wavelength conversion member body 22. The filter layer 23 is a layer that suppresses the transmission of light (excitation light A) at the wavelength of the excitation band of the inorganic phosphor particles 3 and transmits fluorescence B emitted from the inorganic phosphor particles 3.

[0080] In the wavelength conversion member 21, excitation light A emitted from the light source 10 enters the wavelength conversion member body 22 of the wavelength conversion member 21 from the first main surface 21a side. The excitation light A that enters the wavelength conversion member body 22 is irradiated onto inorganic phosphor particles 3 contained within the wavelength conversion member body 22. The excitation light A irradiated onto the inorganic phosphor particles 3 is converted to a different wavelength by the inorganic phosphor particles 3 and passes through the filter layer 23 as fluorescence B having the emission peak wavelength of the inorganic phosphor particles 3, and is emitted from the second main surface 21b side of the wavelength conversion member 21.

[0081] Since the wavelength conversion member 21 includes a wavelength conversion member body 22 having the same configuration as the wavelength conversion member 1, the excitation light A is efficiently incident on the inorganic phosphor particles 3, and fluorescence B can be efficiently extracted from the wavelength conversion member body 22. Furthermore, since the wavelength conversion member 21 includes a wavelength conversion member body 22 having the same configuration as the wavelength conversion member 1, the excitation light A can be shielded more efficiently. Therefore, fluorescence B can be extracted more selectively from the wavelength conversion member body 22, and light having the chromaticity of fluorescence B itself can be extracted.

[0082] Furthermore, since the wavelength conversion member 21 is further equipped with a filter layer 23, even if excitation light A leaks from the wavelength conversion member body 22 to the filter layer 23, the filter layer 23 can more reliably shield the excitation light A. On the other hand, since the filter layer 23 transmits fluorescence B having the emission peak wavelength of inorganic phosphor particles 3, fluorescence B can be extracted more selectively from the wavelength conversion member body 22, and light having the chromaticity of fluorescence B itself can be extracted. Therefore, when it is desired to extract light having the chromaticity of fluorescence B itself from the wavelength conversion member 21, light having the desired chromaticity can be extracted. Thus, the wavelength conversion member 21 can efficiently extract light having the desired chromaticity.

[0083] As the filter layer 23, a single-layer or multilayer film composed of oxides, nitrides, or fluorides can be used. In particular, a dielectric multilayer film is preferably used as the filter layer 23, in which a low refractive index film with a relatively low refractive index and a high refractive index film with a relatively high refractive index are alternately laminated. Examples of low refractive index films include silicon oxide, aluminum oxide, or magnesium fluoride. Examples of high refractive index films include niobium oxide, titanium oxide, zirconium oxide, lanthanum oxide, tantalum oxide, yttrium oxide, gadolinium oxide, tungsten oxide, hafnium oxide, silicon oxynitride, silicon nitride, or aluminum nitride.

[0084] In dielectric multilayer films, the thickness of the low refractive index film can be, for example, 1.5 nm to 150 nm. The thickness of the high refractive index film can also be, for example, 1.5 nm to 150 nm.

[0085] The total thickness of the dielectric multilayer film is preferably 15 nm or more, more preferably 50 nm or more, even more preferably 100 nm or more, even more preferably 300 nm or more, even more preferably 500 nm or more, even more preferably 700 nm or more, particularly preferably 1000 nm or more, preferably 3000 nm or less, and more preferably 2500 nm or less. When the total thickness of the dielectric multilayer film is greater than or equal to the lower limit above, the wavelength band of the transition portion from the transmission wavelength range to the opaque wavelength range in the dielectric multilayer film can be made narrower and the gradient more abrupt. On the other hand, when the total thickness of the dielectric multilayer film is less than or equal to the upper limit above, distortion is less likely to occur in the dielectric multilayer film, and peeling or cracking of the dielectric multilayer film from the wavelength conversion member body 22 can be made less likely.

[0086] In a dielectric multilayer film, the total number of layers of high-refractive-index and low-refractive-index films is preferably 10 or more, more preferably 14 or more, even more preferably 16 or more, even more preferably 18 or more, even more preferably 20 or more, even more preferably 22 or more, even more preferably 24 or more, even more preferably 25 or more, preferably 200 or less, more preferably 150 or less, even more preferably 100 or less, even more preferably 80 or less, and even more preferably 60 or less. When the total number of layers of high-refractive-index and low-refractive-index films is greater than or equal to the above lower limit, the wavelength band of the transition portion from the transmission wavelength range to the opaque wavelength range in the dielectric multilayer film can be made narrower and the gradient more abrupt. On the other hand, when the total number of layers of high-refractive-index and low-refractive-index films is less than or equal to the above upper limit, distortion is less likely to occur in the dielectric multilayer film, and peeling or cracking of the dielectric multilayer film from the wavelength conversion member body 22 can be made less likely.

[0087] The dielectric multilayer film can be formed on the main surface 22a of the wavelength conversion member body 22 using known film deposition methods such as sputtering, vacuum deposition, ion beam, ion plating, and CVD. Among these, sputtering is preferred as the film deposition method because it allows for high-precision control of the thickness of each layer and provides a dielectric multilayer film with stable film quality. The filter layer 23 does not need to be formed on the entire main surface 22a of the wavelength conversion member body 22; it is sufficient if it is formed on at least a portion of the main surface 22a of the wavelength conversion member body 22.

[0088] In the second embodiment, the filter layer 23 is provided on the output side of the wavelength conversion member body 22. However, in the present invention, other films such as anti-reflective coatings may also be provided on the incident side of the wavelength conversion member body 22. In this case, the other films may be provided instead of the filter layer 23, between the wavelength conversion member body 22 and the filter layer 23, or on top of the filter layer 23, and are not particularly limited as long as they do not hinder the effects of the present invention.

[0089] [Light-emitting devices] (Third and fourth embodiments) Figure 5 is a schematic cross-sectional view showing a light-emitting device according to a third embodiment of the present invention. As shown in Figure 5, the light-emitting device 31 comprises a wavelength conversion member 1 according to the first embodiment described above, and a light source 10 that emits excitation light A to the wavelength conversion member 1. In the light-emitting device 31, the light source 10 is positioned so that the excitation light A is directly incident on the wavelength conversion member 1.

[0090] Figure 6 is a schematic cross-sectional view showing a light-emitting device according to a fourth embodiment of the present invention. As shown in Figure 6, in the light-emitting device 41, a light guide plate 42 is arranged between the light source 10 and the wavelength conversion member 1. The light source 10 is positioned so that the excitation light A is directly incident on the light guide plate 42. The excitation light A emitted from the light source 10 passes through the light guide plate 42 and is incident on the wavelength conversion member 1. Specifically, the excitation light A is incident from the end face of the light guide plate 42, exits from the main surface of the light guide plate 42, and is incident on the wavelength conversion member 1. A material with low absorption of excitation light A can be used as the light guide plate 42. The light guide plate 42 and the wavelength conversion member 1 may be joined together.

[0091] Since the light-emitting devices 31 and 41 of the third and fourth embodiments include the wavelength conversion member 1 described above, it is possible to efficiently extract light of a desired chromaticity from the wavelength conversion member 1.

[0092] The present invention will be described in more detail below based on specific examples. The present invention is not limited in any way to the following examples, and can be implemented with appropriate modifications without changing its essence.

[0093] (Example 1) As inorganic particles forming the inorganic matrix, glass powder (softening point: 850°C, thermal expansion coefficient: 68 × 10⁻⁶) -7 / ℃, average particle diameter D 50 A 2.5 μm (size) particle was prepared. In addition, α-SiAlON (rod-shaped, lengthwise dimension: 15 μm, dimension perpendicular to the lengthwise direction: 5 μm, average aspect ratio: 3) was prepared as an inorganic phosphor particle.

[0094] Next, a slurry (viscosity: 4 Pa·s) was obtained by kneading the prepared glass powder, inorganic phosphor particles, binder resin (Oricox, manufactured by Kyoeisha Chemical Co., Ltd.), plasticizer (dioctyl adipate), dispersant (Floren G-700, manufactured by Kyoeisha Chemical Co., Ltd.), and organic solvent (methyl ethyl ketone). The inorganic phosphor particles were added so that their content in the formed inorganic matrix was 30% by mass (the concentration of inorganic phosphor particles was 30% by mass). Next, the obtained slurry was formed into a sheet using the doctor blade method and dried at room temperature to obtain a green sheet. The transport speed of the support substrate when forming the green sheet using the doctor blade method was 0.5 m / min. The distance between the nozzle and the support substrate when forming the green sheet using the doctor blade method was 0.1 m.

[0095] Next, the obtained green sheet was degreased in an electric furnace, and then vacuum-fired in a vacuum gas-purging furnace at 900°C (softening point of glass powder + 50°C) for 30 minutes. The resulting fired body was then polished on each side to achieve the desired layer thickness, thereby obtaining a wavelength conversion member in which inorganic phosphor particles were dispersed in an inorganic matrix. The thickness of the wavelength conversion member was 0.12 mm.

[0096] (Example 2) A wavelength conversion member was obtained in the same manner as in Example 1, except that when preparing the slurry, inorganic phosphor particles were added so that the content of inorganic phosphor particles in the formed inorganic matrix was 35% by mass (the concentration of inorganic phosphor particles was 35% by mass).

[0097] (Comparative Example 1) Next, in the same manner as in Example 1, a mixed powder of the prepared glass powder and inorganic phosphor particles was pressure-molded in a mold to produce a pre-molded body with a diameter of 20 mm and a thickness of 7 mm. The inorganic phosphor particles were added so that their content in the formed inorganic matrix was 30% by mass (the concentration of inorganic phosphor particles was 30% by mass). Next, the pre-molded body was fired at 900°C for 30 minutes to obtain a wavelength conversion member. The obtained fired body was then polished on each side to achieve the desired layer thickness to obtain a wavelength conversion member in which inorganic phosphor particles were dispersed in the inorganic matrix. The thickness of the wavelength conversion member was 0.12 mm.

[0098] (Comparative Example 2) A wavelength conversion member was obtained in the same manner as in Comparative Example 1, except that the content of inorganic phosphor particles in the formed inorganic matrix was changed to 35% by mass.

[0099] [evaluation] (Evaluation of average orientation angle) Cross-sectional images perpendicular to the first main surface of the wavelength conversion members obtained in Examples 1 and 2 and Comparative Examples 1 and 2 were observed, and the average orientation angle and frequency distribution of the orientation angle of the inorganic phosphor particles were obtained from the obtained images. The cross-sectional images of the wavelength conversion members were observed using a scanning electron microscope (SEM), and the frequency distribution of the orientation angle was obtained by image processing using the SEM images. In Examples 1 and 2, the average orientation angle of the inorganic phosphor particles with respect to the direction along the first main surface of the wavelength conversion member was between 0° and 45°, whereas in Comparative Examples 1 and 2, the average orientation angle was greater than 45°. Furthermore, in Examples 1 and 2, in the frequency distribution of orientation angles of inorganic phosphor particles along the first main surface of the wavelength conversion member, the ratio of the total frequency of orientation angles between 0° and 30° and 150° and 180° to the total frequency was 40% or more, while in Comparative Examples 1 and 2, the ratio of the total frequency of orientation angles between 0° and 30° and 150° and 180° to the total frequency was less than 40%.

[0100] (Relative luminous flux value) The wavelength conversion members obtained in Examples 1 and 2 and Comparative Examples 1 and 2 were placed under a light source (LED) with an excitation peak wavelength of 450 nm. Light emitted from the bottom surface of the wavelength conversion member was captured inside the integrating sphere and then guided to a spectrometer (Ocean Photonics, model number "USB2000") whose wavelength was calibrated using a standard light source. The relative luminous flux value was measured from the energy distribution spectrum of the light. Here, the LED and the wavelength conversion member were spaced 5 mm apart, and the wavelength conversion member was installed so as to block a φ2 mm hole at the top of the integrating sphere. The results are shown in Table 1 below.

[0101] (Blue shielding rate) With no wavelength conversion element placed under a light source (LED) with an excitation peak wavelength of 450 nm, the light from the direct light source was introduced into the integrating sphere, and the intensity of the peak wavelength (I0) was read from the energy distribution spectrum of the light detected by a spectrometer. Subsequently, using the same method as for measuring the luminous flux value, the intensity of the peak wavelength (I1) of the transmitted light from the excitation light source was read from the energy distribution spectrum of the light. Then, the blue light shielding rate was calculated from I0 and I1 using the formula: Blue light shielding rate (%) = (I0 - I1) / I0 × 100.

[0102] [Table 1]

[0103] Table 1 shows that, compared to the wavelength conversion members obtained in Examples 1 and 2 using the same inorganic phosphor particle concentration, both the relative luminous flux and the blue light shielding rate were improved. This confirms that the wavelength conversion members obtained in Examples 1 and 2 can efficiently extract light of the desired chromaticity. [Explanation of Symbols]

[0104] 1, 21... Wavelength conversion components 1a, 21a... First main surface 1b, 21b... Second principal surface 2…Inorganic matrix 3…Inorganic phosphor particles 10…Light source 22...Wavelength conversion component body 22a…main surface 23…Filter layer 31, 41… Light-emitting devices 42...Light guide plate A...Excitation light B...Fluorescent

Claims

1. A wavelength conversion member having a first main surface and a second main surface facing each other, Inorganic matrix and Dispersed in the aforementioned inorganic matrix are inorganic phosphor particles having an average aspect ratio of 2 or more, Equipped with, A wavelength conversion member wherein the average orientation angle of the inorganic phosphor particles with respect to the direction along the first main surface of the wavelength conversion member is 0° or more and 45° or less.

2. A wavelength conversion member having a first main surface and a second main surface facing each other, Inorganic matrix and Dispersed in the aforementioned inorganic matrix are inorganic phosphor particles having an average aspect ratio of 2 or more, Equipped with, A wavelength conversion member in which, when an image of a cross-section perpendicular to the first main surface of the wavelength conversion member is observed, the ratio of the total frequency of orientation angles of the inorganic phosphor particles with respect to the direction along the first main surface of the wavelength conversion member to the total frequency of orientation angles of 0° to 30° and 150° to 180° is 40% or more.

3. The wavelength conversion member according to claim 1 or 2, wherein the inorganic phosphor particles are nitride phosphor particles or oxynitride phosphor particles.

4. The wavelength conversion member according to claim 1 or 2, wherein the inorganic phosphor particles are particles having an excitation band between 300 nm and 500 nm and an emission peak between 500 nm and 780 nm.

5. The wavelength conversion member according to claim 1 or 2, wherein the content of the inorganic phosphor particles in the inorganic matrix is ​​5% by mass or more and 65% by mass or less.

6. The wavelength conversion member according to claim 1 or 2, wherein the inorganic matrix is ​​made of glass or ceramics.

7. The wavelength conversion member according to claim 1 or 2, wherein the thickness of the wavelength conversion member is 0.01 mm or more and 2.0 mm or less.

8. A method for manufacturing a wavelength conversion member according to claim 1 or 2, A step of preparing a slurry containing inorganic particles that form the inorganic matrix and inorganic phosphor particles, The process involves applying the slurry onto a support substrate to form a green sheet, The process of obtaining a wavelength conversion member by firing the aforementioned green sheet, A method for manufacturing a wavelength conversion member, comprising the above.

9. A wavelength conversion member according to claim 1 or 2, The wavelength conversion member is provided with a light source that emits excitation light, A light-emitting device comprising the above features.

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