TW202021922A - Powder material for wavelength conversion member - Google Patents

Abstract

Provided is a powder material for a wavelength conversion member, with which the formation of transparency-reducing substances in glass powder due to baking during production is less likely to occur, and which makes it possible to obtain a wavelength conversion member having excellent light retrieval efficiency. This powder material for a wavelength conversion member is characterized by containing a fluorescence powder and a glass powder containing, in terms of mass percent, 70-90% of SiO2 and 10-25% of B2O3.

Description

Raw material powder for wavelength conversion components

The present invention relates to a kind of wavelength conversion used to produce light emitting diodes (LED: Light Emitting Diode) or laser diodes (LD: Laser Diode) to convert the wavelength of light emitted by light emitting elements into other wavelengths Raw material powder for components.

In recent years, as a next-generation light source to replace fluorescent lamps or incandescent lamps, the light source using LED or LD is highly focused in terms of low power consumption, small size and light weight, and easy adjustment of light intensity. As an example of such a next-generation light source, for example, Patent Document 1 discloses a light source in which a wavelength conversion member that absorbs a part of the light from the LED and converts it into yellow light is arranged on an LED emitting blue light. The light source emits white light, which is the synthesized light of the blue light emitted from the LED and the yellow light emitted from the wavelength conversion member.

As the wavelength conversion member, a resin matrix in which phosphor powder is dispersed has previously been used. However, when the wavelength conversion member is used, there is a problem that the resin is deteriorated by the light from the LED, and the brightness of the light source tends to be low. In particular, there is a problem that the resin matrix deteriorates and causes discoloration or deformation due to heat or high-energy short-wavelength (blue to ultraviolet) light emitted by the LED.

Therefore, a wavelength conversion member containing a complete inorganic solid in which phosphor powder is dispersed and fixed in a glass matrix instead of a resin is disclosed (for example, refer to Patent Document 2). The wavelength conversion member has the following characteristics: the glass used as the base material is not easily degraded by the heat of the LED chip or irradiated light, and it is not likely to cause problems such as discoloration or deformation. [Prior technical literature] [Patent literature]

[Patent Document 1] Japanese Patent Laid-open No. 2000-208815 [Patent Document 2] Japanese Patent Laid-Open No. 2003-258308

[Problems to be solved by the invention]

However, the wavelength conversion member described in Patent Document 2 has a problem that devitrification materials are easily generated in the glass matrix due to firing during manufacture. As a result, there is a tendency that excitation light or converted fluorescent light incident into the wavelength conversion member is excessively scattered by the devitrification material, and the return light toward the light source side increases, resulting in a decrease in light extraction efficiency.

In view of the above circumstances, an object of the present invention is to provide a raw material powder for a wavelength conversion member that can obtain a wavelength conversion member that is less likely to generate devitrification material in the glass powder due to firing during manufacturing and has excellent light extraction efficiency. [Technical means to solve the problem]

The inventors of the present invention conducted intensive research and found that the above-mentioned problems can be solved by using a raw material powder for a wavelength conversion member of a glass powder having a specific composition.

That is, the raw material powder for a wavelength conversion member of the present invention is characterized by containing glass powder and phosphor powder containing 70 to 90% of SiO _{2 and} 10 to 25% of B ₂ O ₃ in mass %. The glass powder with this composition has the characteristic that it is not easy to devitrify during firing. Therefore, the wavelength conversion member obtained by firing the raw material powder for the wavelength conversion member of the present invention has less devitrification in the glass matrix, and excessive scattering of excitation light or fluorescent light is suppressed, and as a result, the light extraction efficiency can be improved.

The raw material powder for the wavelength conversion member of the present invention preferably contains 0 to 5% K ₂ O and 0 to 5% Al ₂ O ₃ in mass %.

The raw material powder for the wavelength conversion member of the present invention is preferably glass powder with a softening point of 700 to 1100°C.

The raw material powder for the wavelength conversion member of the present invention is preferably glass powder with a refractive index (nd) of 1.55 or less.

The raw material powder for the wavelength conversion member of the present invention is preferably a phosphor powder selected from oxide phosphors, nitride phosphors, oxynitride phosphors, chloride phosphors, chlorinated phosphors, At least one of the group consisting of halide phosphors, aluminate phosphors and halophosphate chloride phosphors.

The raw material powder for the wavelength conversion member of the present invention preferably contains 0.01 to 70% by mass of phosphor powder.

The wavelength conversion member of the present invention is preferably a sintered body containing the raw material powder for the wavelength conversion member.

The wavelength conversion member of the present invention is characterized in that it is formed by dispersing phosphor powder in a glass matrix containing 70 to 90% of SiO _{2 and} 10 to 25% of B ₂ O ₃ by mass%.

The light-emitting device of the present invention is characterized in that it includes the above-mentioned wavelength conversion member and a light source that irradiates the wavelength conversion member with excitation light.

The vehicle-mounted lighting of the present invention is characterized by using the above-mentioned light-emitting device.

The vehicle-mounted lighting of the present invention is preferably used as a headlight. [Effects of the invention]

Since the raw material powder for the wavelength conversion member of the present invention is unlikely to generate devitrification substances in the glass powder during firing, a wavelength conversion member with excellent light extraction efficiency can be obtained.

The raw material powder for a wavelength conversion member of the present invention is characterized by containing glass powder and phosphor powder containing 70 to 90% of SiO _{2 and} 10 to 25% of B ₂ O ₃ by mass%. The reason for limiting the composition range of the glass powder in this way is explained below. Furthermore, in the following description, if there is no special statement, "%" means "quality%".

SiO ₂ is a component that forms the glass network. The content of SiO ₂ is preferably 70 to 90%, 72 to 85%, 75 to 83%, and particularly preferably 77 to 82%. If the content of SiO ₂ is too small, devitrification tends to occur during firing. In addition, there is a tendency for weather resistance or mechanical strength to decrease. On the other hand, if the content of SiO ₂ is too large, the sintering temperature becomes high, so the phosphor powder is easily deteriorated during firing. In addition, the fluidity of the glass powder during firing is poor, and bubbles are likely to remain in the glass matrix after firing. This air bubble becomes a factor of light scattering similarly to the devitrification material, and the light extraction efficiency of the wavelength conversion member may be reduced.

B ₂ O ₃ is a component that reduces the melting temperature and significantly improves the meltability. The content of B ₂ O ₃ is preferably 10-25%, 12-24%, 15-21%, and particularly preferably 15-20%. If the content of B ₂ O ₃ is too small, devitrification tends to occur during firing. In addition, the fluidity of the glass powder during firing is poor, and the light extraction efficiency of the wavelength conversion member may be reduced for the above reasons. On the other hand, if the content of B ₂ O ₃ is too large, the weather resistance tends to decrease.

The glass powder may contain the following components in addition to the above-mentioned components.

K ₂ O is a component that lowers the melting temperature, improves meltability, and lowers the softening point. However, if the K ₂ O content is too much, the weather resistance tends to decrease. In addition, there is a tendency that K ₂ O becomes a coloring center and absorbs excitation light or fluorescence, which causes a decrease in luminous intensity. Therefore, the content of K ₂ O is preferably 0 to 5%, 0.5 to 4%, 1 to 3%, and particularly preferably 1 to 2%.

Al ₂ O ₃ is a component that improves weather resistance, chemical durability and mechanical strength. The content of Al ₂ O ₃ is preferably 0-5%, 0.01-3%, 0.1-2%, and particularly preferably 0.2-1%. If the content of Al ₂ O ₃ is too large, the meltability tends to decrease.

Li ₂ O and Na ₂ O are components that lower the melting temperature, improve the meltability, and lower the softening point, similarly to K ₂ O. However, if the content of these components is too large, the weather resistance tends to decrease. In addition, it becomes a coloring center and absorbs excitation light or fluorescence, which tends to cause a decrease in luminous intensity. Therefore, the content of Li ₂ O and Na ₂ O are preferably 0 to 5%, 0.5 to 4%, 1 to 3%, and particularly preferably 1 to 2%.

MgO, CaO, SrO and BaO are components that lower the melting temperature to improve the meltability and lower the softening point. Furthermore, these components are different from the alkali metal components and do not affect the reduction of the luminous intensity of the wavelength conversion member. The content of these ingredients is preferably 0 to 5%, 0.01 to 3%, 0.03 to 2%, and more preferably 0.05 to 1%. If the content of these components is too large, the weather resistance tends to decrease. Furthermore, it is preferable that the total amount of MgO, CaO, SrO, and BaO is also within the above range.

Moreover, in addition to the above-mentioned components, various components may be contained within the range which does not impair the effect of this invention. For example, ZnO, P ₂ O ₅ , La ₂ O ₃ , Ta ₂ O ₅ , TeO ₂ , TiO ₂ , Nb ₂ O ₅ , Nb ₂ O ₅ can be contained within a range of 10% or less, especially 5% or less, and 15% or less in total. Gd ₂ O ₃ , Y ₂ O ₃ , CeO ₂ , Sb ₂ O ₃ , SnO ₂ , Bi ₂ O ₃ , As ₂ O ₃ and ZrO ₂ etc. In addition, F may be contained. Since F has the effect of lowering the softening point, by containing F instead of the alkali metal component that is one of the causes of the formation of the coloring center, the time-dependent decrease in luminous intensity can be suppressed while maintaining a low softening point. The content of F is preferably 0-10%, 0-8%, and particularly preferably 0.1-5% in terms of anion %.

Fe and Cr are components that reduce the transmittance of visible light and cause the decrease in luminous intensity. Therefore, the Fe content is preferably 1000 ppm or less, 500 ppm or less, and particularly preferably 100 ppm or less. In addition, the content of Cr is preferably 500 ppm or less, and particularly preferably 100 ppm or less. Among them, in order to prevent Fe and Cr from being contained in the glass, it is necessary to use expensive and high-purity raw materials, so the manufacturing cost tends to increase. Therefore, from the viewpoint of reducing the manufacturing cost, the content of Fe and Cr is preferably 5 ppm or more each, and particularly preferably 10 ppm or more.

The softening point of the glass powder is preferably 700 to 1100°C, 750 to 1050°C, and particularly preferably 800 to 1000°C. If the softening point of the glass powder is too low, the mechanical strength and weather resistance tend to decrease. On the other hand, if the softening point is too high, the sintering temperature will also become high, so the phosphor powder will easily deteriorate in the firing step during production.

The refractive index (nd) of the glass powder is preferably 1.55 or less, 1.52 or less, 1.5 or less, and particularly preferably 1.48 or less. If the refractive index is too high, the refractive index difference with the air becomes large, and fluorescent light or excitation light is easily reflected on the light exit surface of the wavelength conversion member, so the light extraction efficiency is likely to decrease. On the other hand, the lower limit of the refractive index is not particularly limited, but is actually 1.4 or more, and further 1.42 or more.

The average particle size D _{50 of the} glass powder is preferably 100 μm or less, 50 μm or less, 20 μm or less, and particularly preferably 10 μm or less. If the average particle size D _{50 of} the glass powder is too large, in the obtained wavelength conversion member, air bubbles tend to remain in the glass matrix after firing. For the above reasons, the light extraction efficiency of the wavelength conversion member may decrease. The lower limit of the average particle size D ₅₀ of the glass powder is not particularly limited. In consideration of production cost or operability, it is preferably 0.1 μm or more, 1 μm or more, and particularly preferably 2 μm or more. Furthermore, in the present invention, the average particle diameter D ₅₀ refers to a value measured by a laser diffraction method.

As described above, the glass powder used in the present invention is unlikely to cause devitrification due to firing. For example, when the sintered body of glass powder used in the present invention has a wavelength of 550 nm and a thickness of 1 mm, a total light transmittance of 70% or more, 73% or more, especially 75% or more can be achieved.

The phosphor powder can be selected from oxide phosphors (including YAG phosphors and other garnet phosphors), nitride phosphors, oxynitride phosphors, chloride phosphors, and At least one inorganic phosphor from the group consisting of chloro phosphor, halide phosphor, aluminate phosphor, and halophosphate chloride phosphor. Among the phosphor powders, oxide phosphors, nitride phosphors, and oxynitride phosphors have high heat resistance and are relatively resistant to deterioration during firing, so they are preferred. Furthermore, as phosphors other than the above, sulfide phosphors may also be used.

Examples of the above-mentioned phosphor powder include those having an excitation band at a wavelength of 300 to 500 nm and an emission peak at a wavelength of 380 to 780 nm. In particular, blue (wavelength of 440 to 480 nm) and green (wavelength of 500 to 540) nm), yellow (wavelength 540-595 nm), red (wavelength 600-700 nm) light.

Examples of phosphor powders that emit blue fluorescence when irradiated with ultraviolet to near ultraviolet excitation light with a wavelength of 300-440 nm include: (Sr, Ba)MgAl ₁₀ O ₁₇ :Eu ²⁺ , (Sr, Ba) ₃ MgSi ₂ O ₈ : Eu ²⁺ etc.

Examples of phosphor powders that emit green fluorescence when irradiated with ultraviolet to near-ultraviolet excitation light with a wavelength of 300-440 nm include: SrAl ₂ O ₄ :Eu ²⁺ , SrBaSiO ₄ :Eu ²⁺ , (Y, Gd) ₃ Al ₅ O ₁₂ :Ce ³⁺ , SrSiON:Eu ²⁺ , BaMgAl ₁₀ O ₁₇ :Eu ²⁺ , Mn ²⁺ , Ba ₂ MgSi ₂ O ₇ :Eu ²⁺ , Ba ₂ SiO ₄ :Eu ²⁺ , Ba ₂ Li ₂ Si ₂ O ₇ :Eu ²⁺ , BaAl ₂ O ₄ :Eu ²⁺ and so on.

Examples of phosphor powders that emit green fluorescence when irradiated with blue excitation light with a wavelength of 440-480 nm include: SrAl ₂ O ₄ :Eu ²⁺ , SrBaSiO ₄ :Eu ²⁺ , (Y, Gd) ₃ Al ₅ O ₁₂ :Ce ³⁺ , SrSiON:Eu ²⁺ , β-SiAlON:Eu ²⁺ , Lu ₃ Al ₅ O ₁₂ :Ce ³⁺ etc.

As the phosphor powder that emits yellow fluorescence when irradiated with ultraviolet to near ultraviolet excitation light with a wavelength of 300 to 440 nm, La ₃ Si ₆ N ₁₁ :Ce ³⁺ and the like can be ^cited .

Examples of phosphor powders that emit yellow fluorescence when irradiated with blue excitation light with a wavelength of 440-480 nm include: (Y, Gd) ₃ Al ₅ O ₁₂ :Ce ³⁺ , Sr ₂ SiO ₄ :Eu ²⁺ .

Examples of phosphor powders that emit red fluorescence when irradiated with ultraviolet to near ultraviolet excitation light with a wavelength of 300-440 nm include: MgSr ₃ Si ₂ O ₈ :Eu ²⁺ , Mn ²⁺ , Ca ₂ MgSi ₂ O ₇ : Eu ²⁺ , Mn ²⁺ etc.

If irradiated with blue excitation light with a wavelength of 440～480 nm, the phosphor powder will emit red fluorescence. Examples include: CaAlSiN ₃ :Eu ²⁺ , CaSiN ₃ :Eu ²⁺ , (Ca, Sr) ₂ Si ₅ N ₈ : Eu ²⁺ , α-SiAlON:Eu ²⁺ etc.

Furthermore, a plurality of phosphor powders can be mixed and used according to the wavelength region of excitation light or emission. For example, when irradiating excitation light in the ultraviolet region to obtain white light, it is only necessary to mix and use phosphor powders that emit blue, green, yellow, and red fluorescence.

The luminous efficiency (lm/W) of the wavelength conversion member varies according to the type or content of the phosphor powder, and the thickness of the wavelength conversion member. The content of the phosphor powder and the thickness of the wavelength conversion member may be appropriately adjusted so that the luminous efficiency or chromaticity becomes the best. For example, when the thickness of the wavelength conversion member is small, to obtain the required luminous efficiency or chromaticity, it is only necessary to increase the content of the phosphor powder. However, if the content of the phosphor powder is too large, it may become difficult to sinter, the porosity will increase, the excitation light will not be efficiently irradiated to the phosphor powder, and the mechanical strength of the wavelength conversion member may decrease. On the other hand, if the content of the phosphor powder is too small, it is difficult to obtain the desired luminous intensity. From this point of view, the content of the phosphor powder in the raw material powder for the wavelength conversion member of the present invention is preferably 0.01 to 70% by mass, more preferably 0.05 to 50% by mass, and still more preferably 0.08 to 30% by mass .

In addition, the wavelength conversion member that mainly only extracts the fluorescent light to the outside in order to reflect the fluorescent light generated in the wavelength conversion member to the incident side of the excitation light is not limited to the above, and the luminous intensity can be increased in a way The content of the phosphor powder (for example, 30 to 80% by mass, and further 40 to 75% by mass).

The wavelength conversion member of the present invention includes a sintered body of the raw material powder for the wavelength conversion member. Specifically, the wavelength conversion member of the present invention is characterized in that the phosphor powder is dispersed in a glass matrix containing 70 to 90% of SiO _{2 and} 10 to 25% of B ₂ O ₃ by mass%. The reason for limiting the composition of the glass matrix in this manner is as described above, so the description is omitted.

The firing temperature of the raw material powder for the wavelength conversion member is preferably within ±150°C of the softening point of the glass powder, and more preferably within ±100°C of the softening point of the glass powder. If the firing temperature is too low, the glass powder will not flow sufficiently, making it difficult to obtain a dense sintered body. On the other hand, if the firing temperature is too high, the components of the phosphor powder may be thermally degraded and the luminous intensity may decrease.

The firing is preferably performed in a reduced pressure atmosphere. Specifically, the atmosphere during firing is preferably less than 1.013×10 ⁵ Pa, 1000 Pa or less, and particularly preferably 400 Pa or less. Thereby, the amount of bubbles remaining in the wavelength conversion member can be reduced, and for the above reasons, the luminous intensity can be improved. Furthermore, the entire firing step can be carried out in a reduced pressure atmosphere, for example, only the firing step can be carried out in a reduced pressure atmosphere, and the temperature rising step or the temperature falling step before and after the firing step can be carried out in a non-reduced atmosphere (for example, under atmospheric pressure) .

The shape of the wavelength conversion member of the present invention is not particularly limited. For example, it includes not only members having a specific shape such as plate, column, hemispherical, and hemispherical dome, but also includes substrates such as glass substrates or ceramic substrates. Film-like sintered body formed on the surface, etc.

Furthermore, an anti-reflection film or a fine concavo-convex structure layer may also be provided on the surface of the wavelength conversion member. In this way, the light reflectivity on the surface of the wavelength conversion member is reduced, the light extraction efficiency is improved, and the luminous intensity can be increased.

As the anti-reflection film, a single-layer film or a multilayer film (dielectric multilayer film) containing oxide, nitride, fluoride, etc., can be formed by a sputtering method, an evaporation method, a coating method, or the like. The light reflectance of the anti-reflection film is preferably 5% or less, 4% or less, and particularly preferably 3% or less at a wavelength of 380-780 nm.

Furthermore, it may also be a laminate of a wavelength conversion layer containing phosphor powder and a glass layer not containing phosphor powder. In this way, the glass layer functions as an anti-reflection film, so the light extraction efficiency can be improved. Here, as the glass layer, a glass powder sintered body or bulk glass can be used. The glass used is preferably the same composition as the glass used in the wavelength conversion layer, so that the light reflection loss at the interface between the wavelength conversion layer and the glass layer can be reduced.

Examples of the fine concavo-convex structure layer include a moth-eye structure having a size below the wavelength of visible light. As a method for producing the fine concavo-convex structure layer, nanoimprinting or photolithography can be cited. Alternatively, the surface of the wavelength conversion member may be roughened by sandblasting, etching, polishing, or the like to form a fine uneven structure layer. The surface roughness Ra of the uneven structure layer is preferably 0.001 to 0.3 μm, 0.003 to 0.2 μm, and particularly preferably 0.005 to 0.15 μm. If the surface roughness Ra is too small, it is difficult to obtain the desired anti-reflection effect. On the other hand, if the surface roughness Ra is too large, light scattering becomes large, and the luminous intensity tends to decrease.

Fig. 1 shows an example of an embodiment of the light-emitting device of the present invention. As shown in FIG. 1, the light-emitting device 1 includes a wavelength conversion member 2 and a light source 3. The light source 3 irradiates the wavelength conversion member 2 with excitation light L1. The excitation light L1 incident on the wavelength conversion member 2 is converted into fluorescent light L2 of another wavelength, and is emitted from the side opposite to the light source 3. At this time, the combined light of the excitation light L1 and the fluorescent light L2 that are transmitted without wavelength conversion can also be emitted. [Example]

The present invention will be described in detail below based on examples, but the present invention is not limited to these examples.

Table 1 shows Examples (No. 1 to No. 7) and Comparative Examples (No. 8).

[Table 1]

(1) Production of glass powder The raw materials were prepared so as to have the glass composition shown in Table 1, and were melted at 1200 to 1700°C for 1 to 2 hours using a platinum crucible to vitrify. The molten glass is formed into a film shape by flowing the molten glass between a pair of cooling rolls. After pulverizing the obtained film-like glass formed body by a ball mill, it is classified to obtain a glass powder having an average particle diameter D ₅₀ of 2.5 μm. For the obtained glass powder, the total light transmittance, refractive index, and softening point were measured by the following methods.

The total light transmittance is measured as follows. The glass powder is press-formed with a mold to produce a compact. The powder compact was fired at the temperature described in Table 1 under a reduced pressure atmosphere of 50 Pa or less, and the sintered compact obtained was subjected to mirror polishing so that the thickness of the sintered compact was 1 mm. For the obtained sample, the total light transmittance was measured by the method according to JIS K7105. Table 1 shows the transmittance at a wavelength of 550 nm.

The refractive index is expressed by the measured value of the d-ray (587.6 nm) of a helium lamp using a bulk glass sample made for measurement.

The softening point uses the fiber elongation method, and the temperature at which the viscosity becomes 10 ^7.6 dPa·s.

As shown in Table 1, it is known that the glass powders in No. 1 to No. 7 as examples have a high total light transmittance of 72 to 77.5%, and devitrification caused by firing is suppressed.

(2) Fabrication of wavelength conversion member 8-12% by volume of YAG phosphor powder is mixed with raw material powder in such a way that each glass powder sample obtains the same chromaticity, thereby obtaining raw material powder for wavelength conversion member. The raw powder is press-formed with a mold to produce a cylindrical preform with a diameter of 1 cm. After the preform was fired at the temperature described in Table 1 under a reduced pressure atmosphere of 50 Pa or less, the obtained sintered body was processed to obtain a wavelength conversion member having a square of 1.2 mm and a thickness of 0.2 mm.

The above-mentioned wavelength conversion member was placed on an LED chip with an emission wavelength of 445 nm, which was energized at 800 mA, for an irradiation test. A general-purpose luminescence spectrometer is used to measure the energy distribution spectrum of the light emitted from the upper surface of the wavelength conversion member in the integrating sphere. The total beam value is calculated by multiplying the obtained luminescence spectrum with the standard specific visual sensitivity. The results are shown in Table 1. Furthermore, the table shows the relative value when the total beam value of the sample No. 8 is set to 1.

As shown in Table 1, the total beam value of the wavelength conversion member No. 1 to No. 7 as an example is 1.01 to 1.05, which is higher than that of the wavelength conversion member No. 8 as a comparative example. [Industrial availability]

The wavelength conversion member of the present invention is suitable as a structural member for general lighting such as white LEDs or special lighting (for example, lighting for vehicles such as projector light sources and headlights for vehicles).

1: Light-emitting device 2: Wavelength conversion component 3: light source L1: Excitation light L2: Fluorescent

Fig. 1 is a schematic side view of a light-emitting device according to an embodiment of the present invention.

1: Light-emitting device

2: Wavelength conversion component

3: light source

L1: Excitation light

L2: Fluorescent

Claims (11)

A raw material powder for a wavelength conversion member, characterized by containing glass powder and phosphor powder containing 70 to 90% of SiO _{2 and} 10 to 25% of B ₂ O ₃ by mass%. For example, the raw material powder for wavelength conversion member of claim 1, which contains K ₂ O 0 to 5% and Al ₂ O ₃ 0 to 5% by mass %. Such as the raw material powder for wavelength conversion member of claim 1 or 2, wherein the softening point of the glass powder is 700 to 1100°C. The raw material powder for a wavelength conversion member according to any one of claims 1 to 3, wherein the refractive index (nd) of the glass powder is 1.55 or less. The raw material powder for a wavelength conversion member according to any one of claims 1 to 4, wherein the phosphor powder is selected from oxide phosphors, nitride phosphors, oxynitride phosphors, and chloride phosphors , At least one of the group consisting of chlorinated phosphors, halide phosphors, aluminate phosphors and halophosphate chloride phosphors. The raw material powder for a wavelength conversion member according to any one of claims 1 to 5, which contains 0.01 to 70% by mass of phosphor powder. A wavelength conversion member comprising a sintered body of raw material powder for a wavelength conversion member according to any one of claims 1 to 6. A wavelength conversion member characterized in that the phosphor powder is dispersed in a glass matrix containing 70 to 90% of SiO _{2 and} 10 to 25% of B ₂ O ₃ by mass%. A light-emitting device characterized in that it is provided with the wavelength conversion member of claim 7 or 8 and a light source that irradiates the wavelength conversion member with excitation light. An in-vehicle lighting, characterized by using a light-emitting device as claimed in claim 9. Such as the vehicle lighting of claim 10, which is used as a headlight.

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