JP2022057000A - Method of manufacturing translucent member, translucent member, and light-emitting device - Google Patents

Abstract

To provide a method of manufacturing a translucent member capable of enhancing light-extraction efficiency, and to provide such translucent member and a light-emitting device.SOLUTION: A method of manufacturing a translucent member comprises: preparing a translucent member containing a phosphor and a resin and having a light extraction surface; polishing the light extraction surface; and bringing the polished light extraction surface into contact with an organic solvent.SELECTED DRAWING: Figure 1

Description

The present invention relates to a method for manufacturing a translucent member, a translucent member, and a light emitting device.

As the light emitting element, a light emitting diode (Light Emitting Diode, hereinafter also referred to as “LED”) and a laser diode (Laser Diode, hereinafter also referred to as “LD”) are widely used.

In order to wavelength-convert the light emitted from the light emitting element of the LED or LD, a translucent member containing a phosphor and a resin and at least including a light extraction surface, or a ceramic composite containing a phosphor and an aluminate is used. It is used as a wavelength conversion member. A light emitting device provided with a light emitting element and a wavelength conversion member is used in a wide range of fields as a light source for indoor lighting and in-vehicle lighting, a backlight light source for liquid crystal displays, illumination, and a projector light source.

Patent Document 1 describes a phosphor and translucency as those used in a remote phosphor technology having a configuration in which a semiconductor body including a semiconductor light emitting element and an optical element including a wavelength conversion member are arranged at intervals. A wavelength conversion member having irregularities in at least a part of the planar structure is disclosed in order to improve the light scattering property. In Patent Document 1, in order to form unevenness on at least a part of the planar structure of the wavelength conversion member, a method of immersing in an organic solvent, a method of applying an organic solvent and brushing, and casting into a mold provided with unevenness. The method of doing so is disclosed.

Japanese Unexamined Patent Publication No. 2014-192251

One aspect of the present invention is to provide a method for manufacturing a translucent member, a translucent member, and a light emitting device capable of increasing the light extraction efficiency.

The first aspect is to prepare a translucent member containing a phosphor and a resin and having a light extraction surface, polishing the surface of the light extraction surface, the light extraction surface after polishing, and organic. A method for manufacturing a translucent member, which comprises contacting with a solvent.

The second aspect comprises a phosphor and a resin, and comprises a light extraction surface, which is more than 0 ° and 160 ° or less in cross-sectional view in a region surrounded by a square having a side of 20 μm on the light extraction surface. Translucency having a convex portion having an angle in the range and having two sides in a range of 0.5 μm or more and 2 μm or less on one side, and the number of the convex portions is in the range of 1 or more and 100 or less. It is a member.

A third aspect is a light emitting device including the translucent member and an excitation light source.

According to one aspect of the present invention, it is possible to provide a method for manufacturing a translucent member, a translucent member, and a light emitting device capable of increasing the light extraction efficiency.

FIG. 1 is a flowchart showing an example of a method for manufacturing a translucent member of the present embodiment. FIG. 2A is a schematic perspective view showing an example of a light emitting device. FIG. 2B is a schematic cross-sectional view taken along the line AA'in the light emitting device of FIG. 2A. 2C is a plan view of the light emitting device of FIG. 2A. FIG. 3 is an SEM photograph showing a part of the light extraction surface of one sample of the translucent member according to Example 1 after polishing and before contact with an organic solvent. FIG. 4 is an SEM photograph showing a part of the light extraction surface of one sample of the translucent member according to Example 1 after polishing and after contact with an organic solvent. FIG. 5 is a schematic view of a convex portion having two sides measured on the light extraction surface of the translucent member. FIG. 6 is an SEM photograph showing a part of the light extraction surface of one sample of the translucent member according to Example 1 after polishing and before contact with an organic solvent. FIG. 7 is an SEM photograph showing a part of the light extraction surface of one sample of the translucent member according to Example 1 after polishing and after contact with an organic solvent.

Hereinafter, a method for manufacturing a translucent member, a translucent member, and a light emitting device according to the present invention will be described based on an embodiment. However, the embodiments shown below are examples for embodying the technical idea of the present invention, and the present invention is not limited to the following method for manufacturing a translucent member. The relationship between the color name and the chromaticity coordinate, the relationship between the wavelength range of light and the color name of monochromatic light, and the like follow JIS Z8110.

Method for manufacturing a translucent member In the method for manufacturing a translucent member according to the present embodiment, a translucent member containing a phosphor and a resin and having a light extraction surface is prepared, and the surface of the light extraction surface is prepared. It includes polishing and contacting the light extraction surface after polishing with an organic solvent.
For example, when the surface of the wavelength conversion member is polished in order to improve the light extraction efficiency, unevenness may be formed on the surface of the wavelength conversion member, and the tip of the convex portion of the uneven structure may have an acute-angled shape. After polishing the surface of the wavelength conversion member, if the tip of the convex portion of the concave-convex structure on the surface of the wavelength conversion member has an acute-angled shape, light is diffusely reflected inside the wavelength conversion member due to the acute-angled shape of the tip of the convex portion. Therefore, it may not be possible to increase the efficiency of light extraction. However, the method for manufacturing the translucent member in the present embodiment can increase the light extraction efficiency. That is, by dissolving the acute-angled portion on the surface of the polished wavelength conversion member with an organic solvent, the acute-angled portion becomes a slightly rounded shape. It is considered that the change in the shape of the unevenness on the surface of the wavelength conversion member changes the reflection angle from the light emitting element, and the light extraction efficiency from the wavelength conversion member is improved by reducing the total reflection. Further, although a part of the light reflected on the surface of the wavelength conversion member returns to the phosphor, the total reflection on the surface of the wavelength conversion member is reduced due to the change in the shape of the unevenness on the surface of the wavelength conversion member. As a result, the light emitted from the phosphor due to the return light of the light from the light emitting element due to the surface reflection is reduced, while the light from the light emitting element is increased, and the light from the light emitting element in the chromaticity coordinates, that is, blue The light is supposed to increase.

FIG. 1 is a flowchart of a method for manufacturing a translucent member. A process of a method for manufacturing a translucent member will be described with reference to FIG. 1. The method for manufacturing the translucent member includes a preparation step S101 for the translucent member, a polishing step S102 for the light extraction surface of the translucent member, and a contact step S103 between the light extraction surface of the polished translucent member and an organic solvent. ,including.

Preparation of Translucent Member The translucent member contains a phosphor and a resin, and has a light extraction surface. In the case of a translucent member used in a light emitting device, it is preferable that the light transmitting member transmits 60% or more of the light emitted from the light emitting element. The translucent member may have, for example, a transmittance of light emitted from a light emitting element of 70% or more, 80% or more, or 90% or more.

The resin contained in the translucent member includes silicone resin, silicone-modified resin, epoxy resin, epoxy-modified resin, phenol resin, polycarbonate resin, acrylic resin, polymethylpentene resin (for example, TPX (registered trademark)), polynorbornene resin, and the like. And at least one resin selected from the group consisting of a mixture thereof. Among them, at least one selected from the group consisting of a silicone resin and an epoxy resin is preferable, and a silicone resin having excellent light resistance and heat resistance is more preferable.

The phosphor contained in the translucent member is preferably one that is excited by the light from the light emitting element. The fluorophore is, for example, a cerium-activated rare earth aluminate phosphor (YAG, LAG), europium and / or chromium-activated nitrogen-containing calcium aluminosilicate (CaO-Al ₂ O ₃ -SiO ₂ ) -based fluorophore. , Europium-activated silicate ((Sr, Ba) ₂ SiO ₄ ) -based fluorescent material, β-sialon fluorescent material, europium-activated nitride fluorescent material (CASN, SCASN), manganese-activated fluoride fluorescent material. (KSF), Europium-activated sulfide fluorophore. As the fluorescent substance contained in the translucent member, one type may be used alone, or two or more kinds of fluorescent materials having different compositions may be used in combination.

The average particle size of the phosphor measured by the Fisher Sub-Sheave Sizar method (hereinafter, also referred to as “FSSS method”) is preferably in the range of 5 μm or more and 50 μm or less, which is more preferable. Is in the range of 6 μm or more and 45 μm or less, and more preferably in the range of 7 μm or more and 40 μm or less. When the average particle size of the phosphor is large, the light emitted from the light emitting element can be efficiently wavelength-converted, and the efficiency of extracting light from the light extraction surface of the translucent member can be improved. On the other hand, if the average particle size of the phosphor is too large, the workability is lowered. The FSSS method is a kind of air permeation method, and is a method of measuring the specific surface area by utilizing the flow resistance of air and mainly determining the particle size of primary particles. The average particle size measured by the FSSS method is the Fisher Sub-Sizar's Number.

The phosphor may be, for example, a so-called nanocrystal or a luminescent substance called a quantum dot. Examples of these materials include semiconductor materials, for example, group 2 to 6 group, 3 to 5 group, 4 to 6 group semiconductors, specifically, CdSe, core-shell type CdS _x Se _1-x / ZnS, and nano such as GaP. Examples include highly dispersed particles of size. In addition, perovskite, lead sulfide, chalcopyrite and the like can also be used. Examples of such a fluorescent substance include a particle size of about 1 nm to 20 nm (10 to 50 atoms). By using such a phosphor, internal scattering can be suppressed and the light transmittance can be further improved. Since the quantum dot phosphor is unstable, it may be surface-modified or stabilized with a resin such as PMMA (polymethyl methacrylate). These may be a bulk body (for example, a plate-shaped body) formed by being mixed with a transparent resin (for example, epoxy resin, silicone resin, etc.) as a base material constituting the translucent member, or between glass plates. It may be a plate-like body sealed with a transparent resin.

The blending ratio of the resin and the phosphor in the translucent member differs depending on the type of the resin and the phosphor contained in the translucent member. The total amount of the phosphor is preferably in the range of 80 parts by mass or more and 300 parts by mass or less with respect to 100 parts by mass of the resin in the composition for the translucent member for forming the translucent member, which is more preferable. Is in the range of 100 parts by mass or more and 250 parts by mass or less, and more preferably in the range of 120 parts by mass or more and 200 parts by mass or less. When the resin is a silicone resin and a KSF phosphor, a β-sialon phosphor, and a silica filler are mixed to form a composition for a translucent member, in order to match the composition with a predetermined chromaticity coordinate. , The content of the component contained in the composition for the translucent member can be adjusted as appropriate. For example, in the composition for a translucent member, the KSF phosphor is in the range of about 70 parts by mass or more and 80 parts by mass or less, and the β-sialon phosphor is about 75 parts by mass or more and 85 parts by mass or less with respect to 100 parts by mass of the silicone resin. Within the range of, the filler can be in the range of about 1 part by mass or more and 8 parts by mass or less.

The translucent member may contain a filler (for example, a filler, a diffusing agent, a coloring agent, etc.) in addition to the phosphor and the resin. For example, examples of the filler include silica, titanium oxide, zirconium oxide, magnesium oxide, glass, a crystal or sintered body of a phosphor, and a sintered body of a phosphor and an inorganic binder. Optionally, the refractive index of the filler may be adjusted. The refractive index of the filler is, for example, 1.8 or more.

The filler is preferably particles. The shape of the particles may be crushed, spherical, hollow, porous or the like. The average particle size (median diameter) of the particles is preferably in the range of 0.08 μm or more and 10 μm or less, which can obtain a light scattering effect with high efficiency. The average particle size of the particles of the filler is preferably an average particle size (median diameter) at which the cumulative frequency from the small diameter side in the volume-based particle size distribution measured by the laser diffraction / scattering type particle size distribution measurement method reaches 50%, for example. When a commercially available filler is used, the average particle size can be referred to the catalog value. The filler is preferably in the range of 10% by mass or more and 80% by mass or less with respect to the total amount of the translucent member, for example. The filler contained in the translucent member is preferably in the range of 0.1 parts by mass or more and 10 parts by mass or less, and more preferably 0.5 parts by mass or more and 8 parts by mass with respect to 100 parts by mass of the resin. It is within the following range.

The translucent member is preferably a sheet-like body or a plate-like body having a light extraction surface and a surface facing the light extraction surface. When the translucent member is a sheet-shaped body or a plate-shaped body, it is easy to manufacture the translucent member, and when the translucent member is used in the light emitting device, it is arranged in the direction of the light emitted from the light emitting element. It is easy to manufacture a light emitting device. The translucent member may be a layered member in which a plurality of particle layers containing a particulate phosphor are laminated.

The method for forming the translucent member is a method in which the translucent member is formed into a sheet-like body or a plate-like body and bonded by a hot melt method or an adhesive, or a phosphor is attached by an electrophoretic deposition method. Examples thereof include a method of impregnating a translucent resin later, a potting method, a compression molding method, a spraying method, an electrostatic coating method, and a printing method. When forming the translucent member using these methods, silica (Aerosil) or the like may be added in order to adjust the viscosity or fluidity. When the translucent member contains a phosphor, it is preferable to form the translucent member by using a spray method, particularly a pulse-shaped, that is, a pulse spray method in which a spray is intermittently sprayed. By forming the translucent member by using the pulse spray method, for example, the phosphor can be uniformly applied to the coated surface having an uneven shape. Further, since the pulse spray method can reduce the wind speed of air without reducing the ejection speed of the slurry from the nozzle, the phosphor contained in the translucent member and the surface of another member, for example, a light emitting element. It is possible to form a coating film having high adhesion. Further, the particle layer of the thin film containing the particulate phosphor can be formed by a plurality of layers.

As the pulse spray method, for example, the known methods described in JP-A-61-161175, JP-A-2003-30000 and International Publication No. 2013/038953 can be referred to.

The thickness of the translucent member is not particularly limited, and may be, for example, 1 μm or more and 300 μm or less, 1 μm or more and 100 μm or less, 2 μm or more and 60 μm or less, and 5 μm or more and 40 μm. It may be within the following range. For example, when a translucent member is used in a light emitting device and is formed by a spray method, the translucent member has a thickness of 20 times or less the total thickness of the nitride semiconductor laminate used in the light emitting element. It may be 10 times or less, 6 times or less, 4 times or less, and 3 times or less.

The light extraction surface (hereinafter, may be referred to as “upper surface”) of the translucent member may be a flat surface. In order to control the light distribution, the light extraction surface or other surface may be a convex or concave uneven surface.

Polishing process The surface of the light extraction surface of the translucent member is polished. Examples of the polishing method include a method of polishing using polishing paper, buffing, a diamond grindstone and the like. Polishing may be performed using an apparatus. When using abrasive paper, abrasive paper having a count of 2000 (# 2000) or more and 6000 (# 6000) or less may be used. The translucent member may be cut to a desired size or thickness, and then the light extraction surface may be polished. As a method for cutting the translucent member to a desired size or thickness, for example, blade dicing, laser dicing, or wire saw can be used.

The arithmetic mean roughness Ra1 of the light extraction surface of the translucent member after polishing and before contacting with an organic solvent described later is preferably in the range of 0.8 μm or more and 5.0 μm or less, more preferably. It is in the range of 0.9 μm or more and 4.5 μm or less, and more preferably 1.0 μm or more and 4.0 μm or less. If the arithmetic average roughness Ra1 of the light extraction surface of the translucent member after polishing and before contact with the organic solvent is within the range of 0.8 μm or more and 5.0 μm or less, the light-transmitting member is brought into contact with the organic solvent after polishing. In the process, the sharp part at the tip of the convex part generated by polishing existing on the light extraction surface can be rounded, and the amount of light can be converged in the direction perpendicular to the light extraction surface by the lens effect of the curved surface of the rounded part. , Light extraction efficiency can be increased. In the light extraction surface of the translucent member, the arithmetic mean roughness of the light extraction surface before contact with the organic solvent is Ra1, and the arithmetic mean roughness of the light extraction surface after contact with the organic solvent is Ra2.

The arithmetic mean roughness of the light extraction surface of the translucent member, the maximum height of the roughness curve described later, and the average length of the roughness curve element are described later even after the light extraction surface of the translucent member is polished. Even after being brought into contact with the organic solvent, it can be measured using, for example, a shape measuring laser microscope (VK-X200, manufactured by Keyence Co., Ltd.) in accordance with JIS B0601-2001.

The maximum height Rz1 of the roughness curve of the light extraction surface of the translucent member after polishing and before contacting with an organic solvent described later is preferably in the range of 5 μm or more and 18 μm or less, more preferably 6 μm or more. It is within the range of 17 μm or less, and more preferably within the range of 7 μm or more and 16 μm or less. In the roughness curve of the light extraction surface of the translucent member, the maximum height before contact with the organic solvent is Rz1, and the maximum height after contact with the organic solvent is Rz2.

The average length RS1 m of the roughness curve element of the light extraction surface of the translucent member after polishing and before contacting with an organic solvent described later is preferably in the range of 10 μm or more and 20 μm or less, and more preferably 11 μm. It is within the range of 19 μm or less, and more preferably 12 μm or more and 18 μm or less. On the light extraction surface of the translucent member, the average length of the roughness curve element before contact with the organic solvent is RS1, and the average length of the roughness curve element after contact with the organic solvent is RS2.

Contact process with organic solvent The light extraction surface of the polished translucent member is brought into contact with the organic solvent. The contact method between the light extraction surface of the polished translucent member and the organic solvent is, for example, a method of immersing the light extraction surface of the polished translucent member in an organic solvent, or a light extraction surface of the polished translucent member. Examples thereof include a method of applying an organic solvent to the light, and a method of dropping the organic solvent on the light extraction surface of the polished translucent member. Examples of the method for applying the organic solvent include a dispens method, a spray method, an electrostatic coating method, a printing method, and a coating method using a brush or a sponge. When the organic solvent is dropped on the light extraction surface of the translucent member, the dropping amount of the organic solvent is in the range of 1 mg / cm ² or more and 3 mg / cm ² or less, although it depends on the type of the dropped organic solvent. It is preferable, and it is more preferable that it is in the range of 1.2 mg / cm ² or more and 1.5 g / cm ² or less. The contact time between the light extraction surface of the polished translucent member and the organic solvent is 3 seconds or more and 40 seconds or less when the light extraction surface of the translucent member is immersed in the organic solvent, for example, in the case of toluene. It is preferable, and 5 seconds or more and 20 seconds or less are particularly preferable. However, since the contact time varies depending on the type and concentration of the organic solvent, adjust as appropriate.

The organic solvent preferably has a boiling point in the range of 50 ° C. or higher and 150 ° C. or lower. When the boiling point of the organic solvent is within the range of 50 ° C. or higher and 150 ° C. or lower, the sharp portion at the tip of the convex portion generated by polishing the light extraction surface of the translucent member is rounded, and the lens effect of the fine convex portion is obtained. The light distribution component of light in the direction perpendicular to the light extraction surface can be increased, the total reflection on the light extraction surface can be reduced, and the light extraction efficiency can be further improved.

The organic solvent is preferably at least one selected from the group consisting of an aliphatic hydrocarbon-based organic solvent, an aromatic hydrocarbon-based organic solvent, a ketone-based organic solvent, and an alcohol-based organic solvent. Examples of the aliphatic hydrocarbon-based organic solvent include n-hexane, n-heptane, cycloheptane, and isooctane. Examples of the aromatic hydrocarbon-based organic solvent include toluene, xylene, benzene and the like. Examples of the ketone-based organic solvent include acetone, methyl ethyl ketone, and methyl isobutyl ketone. Examples of the alcohol-based organic solvent include methanol, ethanol, n-propyl alcohol, isopropyl alcohol and the like. The organic solvent is toluene, xylene, n-heptane, n-hexane, benzene, in order to round the tip of the sharp convex portion generated by polishing the light extraction surface of the translucent member by contact with the organic solvent. It is preferable to use at least one selected from the group consisting of and acetone, and two or more thereof may be used in combination. It is more preferable to use at least one organic solvent selected from the group consisting of toluene, xylene, n-heptane, n-hexane, benzene, and acetone.

After contacting the light extraction surface of the translucent member with the organic solvent, the light extraction surface is dried at room temperature or in a temperature range of 20 ° C. or higher and 130 ° C. or lower in a dryer for 15 minutes or more and 24 hours or less. It is preferable to obtain a translucent member. However, the drying temperature and time will vary depending on the type and concentration of the organic solvent, so adjust accordingly.

The translucent member obtained by contacting the light extraction surface with an organic solvent after polishing preferably has the following characteristics.

The translucent member contains a resin and a phosphor, has a light extraction surface, and has a range of more than 0 ° and 160 ° or less in cross-sectional view within a region surrounded by a square having a side of 20 μm on the light extraction surface. It is provided with a convex portion having an inner angle and having two sides in a range of 0.5 μm or more and 2 μm or less on one side, and the number of convex portions is in the range of 1 or more and 100 or less.

After polishing, the light extraction surface of the translucent member has an angle within the range of more than 0 ° and 160 ° or less in cross-sectional view on the light extraction surface by polishing, and one side is in the range of 0.5 μm or more and 2 μm or less. Many fine protrusions having two inner sides are formed. Some of the fine convex portions formed after polishing the light extraction surface of the translucent member include those having an acute-angled tip. After polishing the light extraction surface of the translucent member, by contacting it with an organic solvent, the fine convex portion itself or the tip portion of the convex portion is dissolved in the organic solvent, and the cross-sectional view exceeds 0 ° and 160 ° or less. Comparison within the range of 0.5 μm or more and 2 μm or less on one side, with less sharp edges at the tips of relatively small fine protrusions within the range of 0.5 μm or more and 2 μm or less on one side. The tip of a large convex part is rounded. Therefore, the translucent member obtained by contacting the light extraction surface with an organic solvent after polishing the light extraction surface exceeds 0 ° in cross-sectional view in the region surrounded by a square having a side of 20 μm on the light extraction surface. The number of convex portions having an angle within the range of 160 ° or less and having two sides within the range of 0.5 μm or more and 2 μm or less on one side is reduced to within the range of 1 or more and 100 or less, and the translucency is transmitted. The member can increase the light distribution component of light in the direction perpendicular to the light extraction surface when used in a light emitting device due to the lens effect of the convex portion having a rounded tip existing on the light extraction surface. It is possible to reduce the total reflection on the light extraction surface and further improve the light extraction efficiency. On the light extraction surface of the translucent member, the angle is within the range of more than 0 ° and 160 ° or less in cross-sectional view within the area surrounded by a square with one side of 20 μm, and one side is 0.5 μm or more and 2 μm. The number of convex portions having two sides in the following range may be preferably in the range of 2 or more and 90 or less, in the range of 3 or more and 85 or less, and in the range of 4 or more and 80 or less. However, it may be in the range of 5 or more and 75 or less. The number of convex portions or particles described later on the light extraction surface of the translucent member can be measured using, for example, a shape measuring laser microscope (VK-X200, manufactured by KEYENCE CORPORATION). A convex portion having an angle in the range of more than 0 ° and 160 ° or less in cross-sectional view may have one side in the range of 0.5 μm or more and 1.5 μm or less, and has two sides of 1 μm on one side. May be good.

Fine shavings are generated on the light extraction surface of the translucent member by polishing, and the shavings become particles separate from the translucent member and form the light extraction surface of the translucent member. exist. When the light extraction surface of the translucent member is polished and then brought into contact with an organic solvent, fine particles are also dissolved in the organic solvent and the number of particles is reduced. On the light extraction surface of the translucent member, there are 30 or less particles in the range of 0.2 μm or more and 20 μm or less in diameter measured in plan view in the area surrounded by a square having a side of 20 μm. preferable. The shape of the particles may be a sphere, an ellipsoid, a polyhedron, or a crushed shape. The particles present on the light extraction surface of the translucent member usually have a diameter measured in a plan view in the range of 0.2 μm or more and 5 μm or less, and may be in the range of 0.2 μm or more and 3 μm or less. On the light extraction surface of the translucent member, 25 or less particles having a diameter of 0.2 μm or more and 20 μm or less measured in a plan view are contained in a region surrounded by a square having a side of 20 μm. It may be 20 or less, or 18 or less. On the light extraction surface of the translucent member, even if there are no particles in the range of 0.2 μm or more and 20 μm or less in diameter measured in plan view in the area surrounded by a square with a side of 20 μm. Often, there may be one or more. The translucent member has 30 or less particles having a diameter of 0.2 μm or more and 20 μm or less as measured in a plan view in a region surrounded by a square having a side of 20 μm on the light extraction surface. It is possible to suppress diffused reflection of light by particles existing on the light extraction surface, increase the light distribution component of light in the direction perpendicular to the light extraction surface, and further improve the light extraction efficiency.

The arithmetic mean roughness Ra2 of the light extraction surface of the translucent member is preferably in the range of 0.2 μm or more and 4 μm or less, more preferably in the range of 0.3 μm or more and 3.5 μm or less, and further preferably. Is in the range of 0.4 μm or more and 3 μm or less. If the arithmetic average roughness Ra2 of the light extraction surface of the translucent member after polishing and after contacting with an organic solvent is within the range of 0.2 μm or more and 4 μm or less, the light extraction surface of the translucent member is used. The tip of the fine convex part formed by polishing becomes round when it comes into contact with the organic solvent, and the lens effect of the curved surface of the rounded part makes it possible to converge the amount of light in the direction perpendicular to the light extraction surface. The efficiency of light extraction can be increased.

In the translucent member, the maximum height Rz2 of the roughness curve of the light extraction surface is preferably 15 μm or less. In the translucent member, the tip of the fine convex portion formed by polishing is rounded by contacting the light extraction surface with an organic solvent after polishing, and the maximum height Rz2 of the roughness curve of the light extraction surface is 15 μm. It becomes smaller as below, and the amount of light can be converged in the direction perpendicular to the light extraction surface due to the lens effect of the curved surface of the rounded portion, and the light extraction efficiency can be improved. In the translucent member, the maximum height Rz2 of the roughness curve of the light extraction surface is more preferably 12 μm or less, further preferably 10 μm or less, still more preferably 8 μm or less, and particularly preferably 6 μm or less. Is. The maximum height Rz2 of the roughness curve of the light extraction surface of the translucent member may be 1 μm or more.

The average length RS2 of the roughness curve element of the light extraction surface of the translucent member is preferably in the range of 1 μm or more and 12 μm or less, more preferably in the range of 2 μm or more and 10 μm or less, and further preferably in the range of 3 μm. It is within the range of 8 μm or less. If the average length RS2 of the roughness curve element of the light extraction surface of the translucent member after polishing and after contact with an organic solvent is within the range of 1 μm or more and 12 μm or less, the light extraction of the translucent member The tip of the fine convex part formed by polishing the surface becomes round and small when it comes into contact with the organic solvent, and the amount of light converges in the direction perpendicular to the light extraction surface due to the lens effect of the curved surface of the round and small part. It is possible to increase the efficiency of light extraction.

In the translucent member, the arithmetic mean roughness Ra1 of the light extraction surface after polishing and before contact with the organic solvent is compared with the arithmetic mean roughness Ra2 of the light extraction surface after polishing and after contact with the organic solvent. The average roughness ratio of Ra2 / Ra1 is preferably in the range of 0.2 or more and 0.8 or less, more preferably in the range of 0.3 or more and 0.7 or less, and further preferably 0.4 or more. It is within the range of 0.6 or less. In the translucent member, the fine convex portion formed on the light extraction surface by polishing is brought into contact with an organic solvent, whereby the fine convex portion can be dissolved or the tip of the convex portion can be rounded. In the translucent member, when the average roughness ratio Ra2 / Ra1 of the light extraction surface after polishing and before and after contact with the organic solvent is within the range of 0.2 or more and 0.8 or less, the convexity is rounded. Due to the lens effect of the curved surface of the portion, the amount of light can be converged in the direction perpendicular to the light extraction surface, and the light extraction efficiency can be improved.

In the translucent member, the roughness of the light extraction surface after polishing and after contact with the organic solvent is relative to the maximum height Rz1 of the roughness curve of the light extraction surface after polishing and before contact with the organic solvent. The maximum height ratio Rz2 / Rz1 of the maximum height Rz2 of the curve is preferably in the range of 0.1 or more and 0.9 or less, more preferably in the range of 0.2 or more and 0.8 or less, and further. It is preferably in the range of 0.3 or more and 0.7 or less, and particularly preferably in the range of 0.4 or more and 0.6 or less. In the translucent member, the fine convex portion formed on the light extraction surface by polishing is brought into contact with an organic solvent, whereby the fine convex portion can be dissolved or the tip of the convex portion can be rounded. In the translucent member, when the maximum height ratio Rz2 / Rz1 of the roughness curve of the light extraction surface after polishing and before and after contact with the organic solvent is within the range of 0.1 or more and 0.9 or less. Due to the lens effect of the curved surface of the rounded convex portion, the amount of light can be converged in the direction perpendicular to the light extraction surface, and the light extraction efficiency can be improved.

In the translucent member, the average length RS1 of the roughness curve element of the light extraction surface after polishing and before contact with the organic solvent, and the roughness curve of the light extraction surface after polishing and after contact with the organic solvent. The average length ratio RS2 / RS1 of the element average length RS2 is preferably in the range of 0.1 or more and 0.9 or less, more preferably in the range of 0.2 or more and 0.8 or less. More preferably, it is in the range of 0.3 or more and 0.7 or less. In the translucent member, by contacting the fine convex portion formed on the light extraction surface by polishing with an organic solvent, the fine convex portion can be dissolved or the tip of the convex portion can be made round and small. In the translucent member, the average length ratio RS2 / RS1 of the roughness curve element of the light extraction surface after polishing and before and after contact with the organic solvent is within the range of 0.1 or more and 0.9 or less. Due to the lens effect of the curved surface of the convex portion that has become round and small, the amount of light can be converged in the direction perpendicular to the light extraction surface, and the light extraction efficiency can be improved.

Light emitting device The light emitting device includes the translucent member and an excitation light source. The excitation light source is preferably a light emitting element.

Hereinafter, embodiments of the light emitting device will be described with reference to the drawings. The light emitting device described below is for embodying the technical idea of the present invention, and the present invention is not limited to the following unless otherwise specified. Further, the contents described in the embodiments and examples can be applied to other embodiments and examples. The size and positional relationship of the members shown in each drawing may be exaggerated for the sake of clarity.

FIG. 2A is a perspective view showing an outline of the light emitting device 1 of the embodiment. The light emitting device 1 is a so-called side view type light emitting device having a surface adjacent to the light extraction surface as a mounting surface. It can also be applied to a light emitting device called a top view type having a surface facing the light extraction surface as a mounting surface.

2B is a schematic cross-sectional view taken along the line AA'of the light emitting device 1 of FIG. 2A, and FIG. 2C is a schematic plan view of the light emitting device 1. The light emitting device 1 includes a light emitting element 5 mounted on the substrate 4 and a translucent member 10 arranged on the light emitting element 5.

The substrate 4 includes a base material 2 and a connection terminal 3. The base material 2 has a first main surface 2a having a longitudinal direction and a lateral direction orthogonal to the longitudinal direction, a second main surface 2b opposite to the first main surface 2a, and a first end surface 2c extending in the longitudinal direction. And a second end face 2d extending in the lateral direction. The connection terminals 3 have at least a pair of positive and negative, and are provided on the first main surface 2a of the base material. Here, the connection terminal 3 is laminated from the base material 2 side toward the upper surface which is the first main surface 2a of the base material 2, the second end surface 2d extending in the lateral direction, and the lower surface which is the second main surface 2b. May be.

The substrate 4 has a recess 25 in the first end surface 2c of the base material 2 which is continuous with the first main surface 2a and the second end surface 2d and / or is continuous with the second main surface 2b and the second end surface 2d. You may be doing it. The recessed portion 25 may be formed so that the length (width) w in the longitudinal direction is larger than the depth d in the lateral direction. The connection terminal 3 may be extended and provided on the recess 25. The recessed portions 25 may be provided on both sides of the base metal 2 in the longitudinal direction.

A light emitting element 5 is mounted on the first main surface 2a of the substrate 4 and is connected to the connection terminal 3. More specifically, one light emitting element 5 is flip-chip mounted on the protrusion pattern 3a of the connection terminal 3. In the light emitting element 5, a pair of positive and negative electrodes are connected to the protrusion pattern 3a of the pair of connection terminals 3 of the substrate 4 by a joining member 6.

A sealing member 7 is provided on the first main surface 2a of the substrate 4 so as to be in contact with the light emitting element 5 and to be in contact with and cover the entire circumference of the side surface thereof. The sealing member 7 is also provided on the surface side of the light emitting element 5 facing the substrate 4. More specifically, the sealing member 7 covers the surface (periphery) of the joining member 6 substantially completely, and is further provided between the light emitting element 5 and the substrate 4. As a result, light can be efficiently extracted upward from the light emitting element 5. Further, since the sealing member 7 is also provided on the surface side of the light emitting element 5 facing the substrate 4, the light emitting element 5 can be more firmly connected to the substrate 4. The upper surface of the sealing member 7 substantially coincides with the upper surface of the light emitting element 5.

The above-mentioned translucent member 10 is arranged on the light emitting element 5, that is, on the surface opposite to the pair of positive and negative electrodes. In the translucent member 10, a surface 10b facing the light extraction surface 10a is arranged on the light emitting element 5 side. The translucent member 10 may cover the upper surface of the sealing member 7, and the end surface of the translucent member 10 may substantially coincide with the end surface of the sealing member 7. The translucent member 10 arranged on the light emitting element 5 emits light due to the lens effect of the convex portion having a rounded tip existing on the light extraction surface because the light extraction surface 10a has the above-mentioned characteristics. When used in an apparatus, it is possible to increase the light distribution component of light in the direction perpendicular to the light extraction surface, reduce total reflection on the light extraction surface, and further improve the light extraction efficiency. ..

On the first main surface 2a side of the base material of the substrate 4, a part of the narrow portion of the connection terminal 3 and the external connection portion 3b are exposed from the sealing member 7 on both sides of the sealing member 7 on the substrate 4. ing. On the second main surface 2b side of the base material, a metal layer 3d is arranged at a portion where the connection terminal 3 is not arranged for reinforcement, heat dissipation, and the like. Two insulating films 8 are formed in the region including the metal layer 3d. The two insulating films 8 are different in size and can function as a mark for distinguishing the anode and the cathode of the light emitting device.

The sealing member 7 may be arranged so as to contact a part or all of at least one side surface of the light emitting element 5 and cover the side surface of the light emitting element 5, and surround the entire circumference of the light emitting element 5. In addition, it may be arranged in contact with the light emitting element 5. The sealing member 7 may be provided thin on the side surface extending in the longitudinal direction (7a in FIG. 2C) of the light emitting device 1 and thick on the side surface extending in the lateral direction (7b in FIG. 2C).

Japanese Patent Application Laid-Open No. 2015-220426 can be referred to for the material, size (size), characteristics, manufacturing method, etc. of each member constituting the light emitting device.

Hereinafter, the present invention will be specifically described with reference to Examples. The present invention is not limited to these examples.

Example 1
Preparation of translucent member The silicone resin is mixed with a KSF phosphor, a β-sialon phosphor, and a silica filler, and the content is appropriately adjusted in order to match the predetermined chromaticity coordinates. For example, the KSF phosphor is in the range of about 70 parts by mass or more and 80 parts by mass or less, the β-sialon phosphor is in the range of about 75 parts by mass or more and 85 parts by mass or less, and the filler is about 1 mass with respect to 100 parts by mass of the silicone resin. It shall be within the range of 2 parts or more and 8 parts by mass or less. A composition for a translucent member was produced by mixing a KSF phosphor and a β-sialon phosphor with a silicone resin. This composition for a translucent member was cured into a sheet to obtain a translucent member in a sheet-like body having a thickness of 20 μm.

Polishing Step One surface of the obtained translucent member, which is the light extraction surface, was polished with polishing paper having a count of 2000 (# 2000) to 6000 (# 6000).

Contact Step with Organic Solvent Toluene was dropped onto the polished surface of the translucent member and spread over the entire surface of the polished surface, and the light extraction surface of the translucent member was brought into contact with toluene. The light extraction surface of the translucent member was brought into contact with toluene and then dried to obtain a translucent member. The amount of toluene dropped was in the range of 1 mg / cm ² to 3 mg / cm ² . More specifically, it was in the range of 1.2 mg / cm ² or more and 1.5 mg / cm ² or less.

Comparative Example 1
The same translucent member as in Example 1 was used as the translucent member of Comparative Example 1 except that the light extraction surface of the translucent member was not polished.

Evaluation of Translucent Member Arithmetic Mean Roughness, Maximum Height of Roughness Curve, Average Length of Roughness Curve Element Each translucent member of Examples and Comparative Examples is before contact with an organic solvent and after polishing. Arithmetic mean roughness of the light extraction surface after contact with organic solvent, maximum height of roughness curve, average length of roughness curve elements are measured according to JIS B0601-2001, shape measurement laser microscope (VK-X200). , Made by Keyence Co., Ltd.). On the light extraction surface of each translucent member, the arithmetic mean roughness before contact with the organic solvent was Ra1, the maximum height of the roughness curve was Rz1, and the average length of the roughness curve elements was RS1. On the light extraction surface of each translucent member, the arithmetic mean roughness after contact with the organic solvent was Ra2, the maximum height of the roughness curve was Rz2, and the average length of the roughness curve elements was RS2. The results are shown in Table 1.

Measurement of convex portions in SEM photographs, measurement of particles In the translucent member of the example, any part of the light extraction surface before and after contact with the organic solvent was observed using a scanning electron microscope (SEM). A sample of the translucent member of the example was placed on an inclined table inclined at 20 °, and an SEM photograph was taken from directly above the translucent member. The reason why the sample of the translucent member was placed on the inclined table and the SEM photograph was taken is to make it possible to more clearly confirm the convex portion of the light extraction surface of the translucent member.

Measurement of convex parts, measurement of particles In the area surrounded by a square of 20 μm on one side of the SEM photograph of the translucent member of the example, as shown in the schematic diagram of the convex parts in FIG. The number of convex portions having an angle in the range of 160 ° or less and having two sides in the range of 0.5 μm or more and 2 μm or less on one side was visually measured. Each of the translucent members of Examples and Comparative Examples was observed by observing any part of the light extraction surface before and after contact with the organic solvent using SEM, and was flat in a region surrounded by a square having a side of 20 μm. The number of particles in the range of 0.2 μm or more and 20 μm or less in the diameter measured visually was visually measured.

In the translucent member according to Example 1, the arithmetic average roughness Ra1 of the light extraction surface after polishing and before contact with the organic solvent is within the range of 0.8 μm or more and 5.0 μm or less, and before and after contact with the organic solvent. The average roughness ratio Ra2 / Ra1 of the light extraction surface was in the range of 0.2 or more and 0.8 or less.
In the translucent member according to Example 1, the maximum height Rz1 of the roughness curve of the light extraction surface after polishing and before contact with the organic solvent is within the range of 5 μm or more and 18 μm or less, and the light before and after contact with the organic solvent. The maximum height ratio Rz2 / Rz1 of the roughness curve of the exposed surface was within the range of 0.1 or more and 0.9 or less.
In the translucent member according to Example 1, the average length RS1 of the roughness curve element of the light extraction surface after polishing and before contact with the organic solvent is within the range of 10 μm or more and 20 μm or less, and before and after contact with the organic solvent. The average length ratio RS2 / RS1 of the roughness curve element of the light extraction surface was in the range of 0.1 or more and 0.9 or less. The translucent member according to the first embodiment was rounded when the tip of a fine convex portion formed by polishing the light extraction surface came into contact with an organic solvent.

FIG. 3 is an SEM photograph taken from directly above the translucent member by installing one sample of the translucent member of Example 1 before contact with the organic solvent on an inclined table having an angle of 20 ° from a plane. .. It was confirmed that fine protrusions were formed on the light extraction surface of the translucent member according to Example 1 by polishing. FIG. 4 is an SEM photograph taken from directly above the translucent member by placing one sample of the translucent member of Example 1 after contact with the organic solvent on an inclined table inclined at an angle of 20 ° from a plane. The light extraction surface of the translucent member according to Example 1 had a rounded tip of a fine convex portion by being brought into contact with an organic solvent after polishing.

In the light extraction surface of the translucent member according to the first embodiment, an angle within a range of more than 0 ° and 160 ° or less in cross-sectional view is provided in a region surrounded by a square having a side of 20 μm, and one side is 1 μm. The number of convex portions having two sides was 360 before the contact with the organic solvent and 56 after the contact with the organic solvent. On the light extraction surface of the translucent member according to the first embodiment, the angle is within a range of more than 0 ° and 160 ° or less in cross-sectional view within a region surrounded by a square having a side of 20 μm, and the side is 1 μm. The number of convex portions having two sides was as small as 1 or more and 100 or less as compared with the number of convex portions before contact with the organic solvent after polishing the light extraction surface. From this result, when the translucent member according to the first embodiment is used in the light emitting device, the direction perpendicular to the light extraction surface is due to the lens effect of the convex portion having a rounded tip existing on the light extraction surface. It was speculated that the light distribution component to the light could be increased, the total reflection on the light extraction surface could be reduced, and the light extraction effect could be improved.

Two or more samples were prepared for the translucent member according to Example 1. On the light extraction surface of one sample of the translucent member according to Example 1, the number of particles having a diameter of 0.2 μm or more and 20 μm or less in a plan view is visually observed in a region surrounded by a square having a side of 20 μm. I measured it. On the light extraction surface of sample 1 of the translucent member according to Example 1, the number of particles having a diameter of 0.2 μm or more and 20 μm or less before contact with the organic solvent is 55, and the diameter after contact with the organic solvent. The number of particles having a value of 0.2 μm or more and 20 μm or less was 16, and the number of particles was smaller than that before contact with the organic solvent. On the light extraction surface of the other sample 2 of the translucent member according to Example 1, the number of particles having a diameter of 0.2 μm or more and 20 μm or less before contact with the organic solvent is 41, and the diameter after contact with the organic solvent. The number of particles having a value of 0.2 μm or more and 20 μm or less was 13, and the number of particles was smaller than that before contact with the organic solvent. From this result, when the translucent member according to the first embodiment is used in the light emitting device, since there are few particles existing on the light extraction surface, diffuse reflection by the particles is suppressed and the direction is perpendicular to the light extraction surface. It was speculated that the light distribution component of the light could be increased and the light extraction efficiency could be improved.

FIG. 6 is an SEM photograph of the light extraction surface of the translucent member according to Example 1 before contact with the organic solvent, and the white frame shows a region surrounded by a square having a side of 20 μm. FIG. 7 is an SEM photograph of the light extraction surface of the translucent member according to Example 1 after contact with an organic solvent, and the white frame shows a region surrounded by a square having a side of 20 μm. The light extraction surface of the translucent member according to Example 1 had fine protrusions formed by polishing, and after polishing, the tips of the fine protrusions were rounded by contacting with an organic solvent. From this result, when the translucent member according to the first embodiment is used in the light emitting device, the direction perpendicular to the light extraction surface is due to the lens effect of the convex portion having a rounded tip existing on the light extraction surface. It was speculated that the light distribution component to the light could be increased, the total reflection on the light extraction surface could be reduced, and the light extraction effect could be improved.

Manufacturing Example 2 of a light emitting device
Using the obtained translucent member according to Example 1, a light emitting device similar to the embodiment shown in FIGS. 2A to 2C was manufactured. Specifically, the light emitting device was manufactured as follows.
As the base material 2 of the substrate 4, a bismaleimide triazine (BT) resin composition (HL832NSF typeLCA, manufactured by Mitsubishi Gas Chemical Company, Inc.) containing a naphthalene-based epoxy resin containing a commercially available glass cloth was used. The base material 2 had a rectangular parallelepiped shape in the absence of the recess 25. As the connection terminal 3, Cu / Ni / Au (total thickness: 2 μm) laminated from the base material 2 side was used. The substrate 4 had a length of 1.8 mm in the longitudinal direction, a width of 0.3 mm in the lateral direction, and a thickness of 0.45 mm. In the light emitting element 5, a laminate of nitride semiconductors (thickness: about 8 to 12 μm) is formed on a sapphire substrate (thickness: about 150 μm), and a pair of positive and negative electrodes are formed on the surface of the laminate opposite to the sapphire substrate. Has.
In the light emitting element 5, a pair of positive and negative electrodes are connected to the protrusion pattern 3a of the pair of connection terminals 3 of the substrate 4 by a meltable bonding member 6 (thickness: 20 μm) which is Au—Sn eutectic solder. , The flip chip is mounted on the substrate 4. As the light emitting element 5, a rectangular parallelepiped blue light emitting (emission peak wavelength 455 nm) LED chip having a length of 0.9 mm in the longitudinal direction, a width of 0.2 mm in the lateral direction, and a thickness of 0.15 mm was used. The surface roughness Ra of the side surface of the light emitting element 5 was 1.0 μm or less.
The translucent member 10 according to the first embodiment was arranged so that the surface 10b facing the light extraction surface 10a was on the light emitting element 5 side, and covered the light emitting element 5. The translucent member 10 according to the first embodiment had a thickness of 20 μm.
The sealing member 7 is formed in a substantially rectangular parallelepiped outer shape having a length (total length) of 1.2 mm in the longitudinal direction, a width (total length) of 0.3 mm in the lateral direction, and a thickness of 0.15 mm. The sealing member 7 contains silica having an average particle size of 14 μm (catalog value) and titanium oxide having an average particle size of 0.25 μm to 0.3 μm (catalog value) as inorganic particles, respectively. It was formed of a silicone resin contained in a range of 2% by mass or more and 2.5% by mass or less, and 40% by mass or more and 50% by mass or less. The end face of the sealing member 7 and the end face of the translucent member 10 were substantially the same.

Comparative Example 2
A light emitting device was manufactured in the same manner as in Example 2 except that the translucent member according to Comparative Example 1 was used.

Evaluation of light emitting device Color degree coordinates (x, y) of light emitting device, luminous flux For each light emitting device of Examples and Comparative Examples, an optical measurement system combining a spectrophotometric device (PMA-11, Hamamatsu Photonics Co., Ltd.) and an integrating sphere. The chromaticity coordinates (x, y) and the luminous flux in the chromaticity coordinate system of the 1931 chromaticity diagram of the CIE (Commission International de l'Eclairage) 1931 were obtained. In each of the translucent members of Examples and Comparative Examples, the chromaticity coordinates of the light emitting device using the translucent member before contact with the organic solvent were defined as the chromaticity coordinates (x1, y1), and the luminous flux was determined as F1. In each of the translucent members of Examples and Comparative Examples, the chromaticity coordinates of the light emitting device using the translucent member after contact with the organic solvent were defined as the chromaticity coordinates (x2, y2), and the luminous flux was determined as F2. Further, the difference between the chromaticity coordinates (x1, y1) and the chromaticity coordinates (x2, y2) was obtained as the rate of change (Δx, Δy) of the chromaticity coordinates. Further, the luminous flux ratio F2 / F1 of the luminous flux F1 and the luminous flux F2 was obtained as the rate of change with the luminous flux F1 as 100%. The results are shown in Table 2.

In the light emitting device according to the second embodiment using the translucent member according to the first embodiment, the translucent member according to the first embodiment has an organic fine convex portion formed by polishing the light extraction surface. The tip of the fine convex part is rounded by contact with the solvent, and the lens effect of the convex part with the rounded tip increases the light distribution component of the light in the direction perpendicular to the light extraction surface, and the light is extracted. The total reflection on the surface could be reduced and the light extraction effect could be enhanced, and the luminous flux ratio F2 / F1 was as high as 100.6%.

In the light emitting device of Comparative Example 2 using the translucent member according to Comparative Example 1, since the translucent member according to Comparative Example 1 was not polished, fine protrusions were not formed and an organic solvent was used. The lens effect could not be expected so much even if they were brought into contact with each other, and the luminous flux ratio F2 / F1 became low.

In one aspect of the present invention, the translucent member can be used as a wavelength conversion member of a light emitting device. The light emitting device using the translucent member is an image in a backlight source of a liquid crystal display, a light emitting device for various lightings, a large display, a light emitting device for a vehicle, a display device, a digital video camera, a facsimile, a copier, a scanner, etc. It can be used for reading devices, projector devices, and the like.

1: Light emitting device, 2: Base material, 2a: First main surface (upper surface), 2b: Second main surface (lower surface), 2c: First end surface, 2d: Second end surface, 3: Connection terminal, 3a: Projection Pattern, 3b: External connection part, 3d: Metal layer, 4: Base material, 5: Light emitting element, 6: Joining member, 7: Sealing member, 7a: Side surface extending in the longitudinal direction, 7b: Extending in the lateral direction Side surface, 8: Insulating film, 10: Translucent member, 10a: Light extraction surface, 10b: Surface with respect to the light extraction surface.

Claims (18)

To prepare a translucent member that contains a phosphor and a resin and has a light extraction surface.
Polishing the surface of the light extraction surface and
A method for manufacturing a translucent member, which comprises contacting a light extraction surface after polishing with an organic solvent. The average roughness ratio Ra2 / Ra1 of the arithmetic average roughness Ra2 of the light extraction surface after contact with the organic solvent and the arithmetic average roughness Ra1 of the light extraction surface after polishing and before contact with the organic solvent is 0.2. The method for manufacturing a translucent member according to claim 1, which is within the range of 0.8 or less. The manufacture of the translucent member according to claim 1 or 2, wherein the arithmetic mean roughness Ra1 of the light extraction surface after polishing and before contact with the organic solvent is within the range of 0.8 μm or more and 5.0 μm or less. Method. The maximum height Rz1 of the roughness curve of the light extraction surface after polishing and before contact with the organic solvent is within the range of 5 μm or more and 18 μm or less, and the average length RS1 of the roughness curve element is 10 μm or more and 20 μm or less. The method for manufacturing a translucent member according to any one of claims 1 to 3, which is within the range of. Maximum height ratio Rz2 of the maximum height Rz2 of the roughness curve of the light extraction surface after contact with the organic solvent and the maximum height Rz1 of the roughness curve of the light extraction surface after polishing and before contact with the organic solvent. The method for manufacturing a translucent member according to any one of claims 1 to 4, wherein Rz1 is in the range of 0.1 or more and 0.9 or less. Average length of the roughness curve element of the light extraction surface after contact with the organic solvent RS2 and the average length of the element of the roughness curve of the light extraction surface after polishing and before contact with the organic solvent RS1 average length The method for manufacturing a translucent member according to any one of claims 1 to 5, wherein the ratio RS2 / RS1 is in the range of 0.1 or more and 0.9 or less. The method for producing a translucent member according to any one of claims 1 to 6, wherein the boiling point of the organic solvent is in the range of 50 ° C. or higher and 150 ° C. or lower. Claims 1 to 7, wherein the organic solvent is at least one selected from the group consisting of an aliphatic hydrocarbon-based organic solvent, an aromatic hydrocarbon-based organic solvent, a ketone-based organic solvent, and an alcohol-based organic solvent. The method for manufacturing a translucent member according to any one of the following items. Claims 1 to 8, wherein the light extraction surface after polishing is immersed in an organic solvent, or the light extraction surface after polishing is coated with an organic solvent to bring the light extraction surface after polishing into contact with the organic solvent. The method for manufacturing a translucent member according to any one of the following items. It contains a phosphor and a resin, has a light extraction surface, and has an angle within a range of more than 0 ° and 160 ° or less in cross-sectional view in a region surrounded by a square having a side of 20 μm. A translucent member having a convex portion having two sides in a range of 0.5 μm or more and 2 μm or less on one side, and having one or more and 100 or less convex portions. The translucent member according to claim 10, wherein the maximum height Rz2 of the roughness curve of the light extraction surface is 15 μm or less. The translucent member according to claim 10 or 11, wherein the arithmetic mean roughness Ra2 of the light extraction surface is within the range of 0.2 μm or more and 4 μm or less. Claims 10 to 12 have 30 or less particles having a diameter of 0.2 μm or more and 20 μm or less measured in a plan view in a region surrounded by a square having a side of 20 μm on the light extraction surface. The translucent member according to any one of the items. The translucent member according to any one of claims 10 to 13, wherein the average particle size of the phosphor measured by the Fisher subsieving sizer method is in the range of 5 μm or more and 50 μm or less. At least one selected from the group consisting of a silicone resin, a silicone-modified resin, an epoxy resin, an epoxy-modified resin, a phenol resin, a polycarbonate resin, an acrylic resin, a polymethylpentene resin, a polynorbornene resin, and a mixture thereof. The translucent member according to any one of claims 10 to 14, which is the resin of the above. The translucent member according to any one of claims 10 to 15, which is a sheet-like body or a plate-like body having a surface facing the light extraction surface. A light emitting device comprising the translucent member according to any one of claims 10 to 16 and an excitation light source. The light emitting device according to claim 17, wherein the excitation light source is a light emitting element.

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