JP2018035046A - Encapsulation material for light source and glass material for encapsulation material for light source - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an encapsulation material for light source capable of permeating lights from ultraviolet to infrared and low in glass transition temperature.SOLUTION: There is provided an encapsulation material for light source in which the encapsulation material for encapsulating a light source is arranged at a position where a light of the light source can be injected, the encapsulation material is a glass layer of a fluorine-containing glass which permeate the light of the light source. There is provided an encapsulation material for light source where the fluorine-containing glass is preferably a fluoride glass or a fluorophosphate glass, where 30 mol% or more of all anion constituting the glass is fluorine.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a sealing material for a light source, and particularly to a sealing material using fluorine-containing glass.

  As light sources used in lighting, projectors, vehicle headlamps, and the like, optical elements such as LED elements and LD elements that have a longer life than those in the past have begun to be used. In the above applications, LED elements, LD elements, and the like have been used as visible light sources that emit visible light.

  Usually, optical elements such as LED elements and LD elements are sealed with a transparent epoxy resin or silicone resin. However, there is a problem that the resin is not suitable for long-term use because it is likely to be deteriorated by ultraviolet light, moisture, heat or the like. Therefore, in the application for sealing the visible light source described above, studies have been made to use a glass sealing material as the sealing material.

For example, Patent Document 1 uses an alkaline earth metal-alkali metal-B ₂ O ₃ —SiO ₂ -based oxide glass for a light source of a projector, and Patent Document 2 discloses general lighting or a vehicle headlamp. For this purpose, it has been proposed to use Bi ₂ O ₃ —B ₂ O ₃ —ZnO-based oxide glass.

  While using an LED element or the like as a visible light source as described above, ultraviolet light is used in applications such as optical devices that require high power output and sterilization apparatuses, and the main light source is still high pressure. Mercury lamps, low-pressure mercury lamps, mercury xenon lamps, xenon lamps, metal halide lamps, cold cathode ozone lamps and the like have been used. However, in recent years, the use of optical elements such as the above-described LED elements as an ultraviolet light source has been studied.

  When an LED element or the like is used as an ultraviolet light source, a sealing material for sealing the LED element is required, but the resin sealing material is deteriorated due to ultraviolet light, absorption of ultraviolet light of the original material, etc. There is a problem that it is inappropriate as a sealing material. Further, when the oxide glass as described above is used as a sealing material, the ultraviolet light is not sufficiently transmitted, or the glass transition temperature of the glass exceeds 500 ° C. or 600 ° C. Therefore, there is a concern that the optical element is damaged, and there is a problem in using it as a sealing material.

  In recent years, there has been an increasing demand for infrared light sources such as surveillance cameras, night vision cameras, and in-vehicle sensors equipped with various sensors that emit infrared light. As the infrared light source, a thermal continuous light source, a pulse light source, an LED element, an LD element, or the like is used. Here, since resin and oxide glass generally absorb infrared light having a wavelength of 3 μm or more, there is a problem that it cannot be used as a sealing material for use that needs to transmit infrared light. At present, there is no sealing material particularly in the case of an infrared light source exceeding 3 μm.

Japanese Patent Laying-Open No. 2015-060969 JP 2012-158494 A

Kenichi Kanno et al., “Intrinsic Luminescence of Alkali Halide Crystals and Relaxed States of Excitons”, Synchrotron Radiation Vol. 4 No. 4 (1991)

  In recent years, there has been an increasing demand for a sealing material replacing a resin as a sealing material for sealing a light source, and in particular, a glass sealing material has been studied. However, glass has a higher softening point (or glass transition temperature) than a resin, and on the other hand, an optical element used for a light source does not have high heat resistance, so that the optical element deteriorates due to heat during sealing. There was a concern.

  As a glass sealing material having a low glass transition temperature, for example, a glass transition temperature of 500 ° C. or lower, bismuth oxide glass, lead oxide glass, vanadium oxide glass, phosphate glass, and the like are widely used. However, since vanadium oxide glass is easy to be colored, it is not suitable as a sealing material that requires light transmission. On the other hand, lead oxide glass is refrained from use due to fear of adverse environmental effects. In addition, phosphoric acid-based glass has higher deliquescence as the glass transition temperature is lowered, and is therefore not preferred for use as a sealing material.

  In addition, although the bismuth oxide glass can suppress coloring depending on the composition, as described above, the oxide glass absorbs ultraviolet light and infrared light, so that another usable light source is limited. was there.

  Accordingly, an object of the present invention is to obtain a sealing material for light source sealing that can transmit light from ultraviolet to infrared and has a low glass transition temperature.

  As a material that can transmit light from ultraviolet to infrared, has a low glass transition temperature, and has higher durability against heat and moisture than a resin, fluorine-containing glass such as fluoride glass can be given. However, as a common knowledge of engineers, fluoride glass is considered to have poor moisture resistance, and until now, there has been no example in which fluoride glass has been used as a general sealing material.

  In the process of examining the above-mentioned problems, the present inventors re-inspected the moisture resistance of the fluoride glass. When the fluoride glass is immersed in water, it deteriorates, but is exposed to the atmosphere. It was found that deterioration can be suppressed for a long time. In addition, when the light resistance was examined by irradiating ultraviolet light in the atmosphere, it was found that the resin had higher durability than the resin. In the case of a device using the optical element, it is difficult to predict the situation where the optical element is directly exposed to water, so if it is used as a sealing material for light source sealing, use fluorine glass as the sealing material. Found it to be very useful.

  That is, the present invention provides a light source sealing material in which a sealing material for sealing a light source is disposed at a position where light from the light source can enter, and the sealing material transmits light from the light source. A sealing material for a light source, which is a glass layer of fluorine-containing glass.

  According to the present invention, it is possible to obtain a sealing material for sealing a light source that can transmit light from ultraviolet to infrared and has a low glass transition temperature.

It is the simple figure which showed an example of embodiment of the optical device using this invention. It is the figure which showed the transmission spectrum of the glass used by the Example and comparative example of this invention. It is a drawing substitute photograph which image | photographed the surface state before and behind the moisture resistance test of the Example of this invention. It is a drawing substitute photograph which image | photographed the surface state before and behind the water resistance test of the Example of this invention.

1: Explanation of terms Terms used in the present specification will be described below.

(Fluorine-containing glass)
The fluorine-containing glass is a glass containing fluorine as an anion component in the composition. The content of fluorine is not particularly limited as long as it transmits a desired amount of ultraviolet light, but it is preferably, for example, 30 mol% or more based on the total anion component in the composition.

(Glass layer)
The glass layer is a sealing material that seals the light source, and transmits ultraviolet light, visible light, and infrared light. Usually, it can be obtained by placing a glass material such as glass powder at a desired position, heating and baking the glass material. Further, if the light source is sealed, the glass layer does not need to be in contact with the light source and may cover the light source at a predetermined interval, but at a position where light from the light source can enter. Shall be provided.

(Glass material)
The glass material is a material for forming a glass layer, and becomes a sealing material by forming the glass layer through a heating process such as baking.

2: Sealing material for light source The present invention relates to a sealing material for light source in which a sealing material for sealing a light source is disposed at a position where light from the light source can be incident. A sealing material for a light source, which is a glass layer of fluorine-containing glass that transmits light from a light source.

(light source)
The light source is not particularly limited as long as it can emit ultraviolet to infrared light, and may be a light source that emits light of 280 to 11000 nm, for example. The light source may be a light source that specializes in a specific wavelength, and examples of the ultraviolet light source include an AlGaN semiconductor light source having a wavelength of 280 to 350 nm, an InGaN / GaN semiconductor light source having a wavelength of 350 nm to 410 nm, and the like. Examples of visible light sources include GaAs-based semiconductor light sources, AsGaAs-based semiconductor light sources, GaP-based semiconductor light sources, GaAsP-based semiconductor light sources, AlGaInP-based semiconductor light sources, and GaInN-based semiconductor light sources. Examples of the infrared light source include a GaInAsSb-based semiconductor light source, an InAsSbP-based semiconductor light source, and a quantum cascade laser.

Moreover, when sealing a light source, it is common to install this light source on a base material and seal a light source on this base material. Examples of such a substrate include a metal substrate containing Al or Cu, an alloy substrate such as Al or Cu, and a ceramic substrate such as Al ₂ O ₃ or AlN. Moreover, the said metal base material and alloy base material may contain Ni, Mo, W, Co, and Fe.

(Glass layer)
As described above, the glass layer is a sealing material that seals the light source, and transmits light of each wavelength. The shape is not particularly limited as long as the light source can be sealed. For example, when an LED chip is used as the light source, a glass layer may be formed on the LED chip. Further, a light emitting element may be installed at the bottom of the concave surface such as an optical semiconductor package, and the glass layer may be formed so as to fill the space of the concave surface. In addition, when various parts such as lenses, other base materials, and wiring are separately provided on the light emitting element, a glass layer is formed between the various parts and the light emitting element, or the various parts and the light emitting element are brought into contact with each other. The whole may be sealed.

  The glass layer is usually obtained by heating and baking a glass material. Examples of such a glass material include glass powder, glass paste using the glass powder, glass pellets obtained by pressure molding the glass powder, and bulk glass. Moreover, by heating using the above glass materials, a glass material is baked and becomes a glass layer. At this time, in addition to heating in the air or in an inert atmosphere, the glass material may be heated while being pressed, or may be heated in a vacuum atmosphere.

(Fluorine-containing glass)
As described above, the fluorine-containing glass is a glass containing fluorine as an anion component in the composition. The content of fluorine is not particularly limited as long as it transmits light of a predetermined wavelength. For example, it may be 30 mol% or more with respect to the total anion component in the composition. Moreover, as other anions of fluorine, halogens other than fluorine may be contained.

Examples of the fluorine-containing glass include Zr-based fluoride glass (for example, ZBLAN, ZBLA, ZBAN, ZBLN, ZBN, ZBL, ZBLaLi), fluoride glass such as AlF ₃ -based glass, and fluorophosphate glass. You may contain elements, such as In and Pb, as needed. Among the above, fluoride glass having good transmittance of ultraviolet light and infrared light is preferable. In particular, ZBLAN glass having a glass transition temperature of 400 ° C. or lower and high moisture resistance is preferable.

The ZBLAN glass as described above is not particularly limited as long as the optical properties are not impaired. For example, in mol%, AlF ₃ is 0 to 45, Hf fluoride and Zr fluoride are 30 to 60 in total, At least one fluoride selected from the group consisting of alkaline earth fluorides 20 to 65 in total, Y, La, Gd, and Lu is selected from the group consisting of 0 to 25 in total, Na, Li, and K It is preferred to contain a total of 0 to 25 at least one fluoride.

Fluorophosphate glass is a material having both low dispersibility, anomalous dispersibility, and low melting point, and is used for high-order chromatic aberration correction glass and the like. Since the phosphoric acid component volatilizes when the above fluorophosphate glass is melted, the phosphoric acid component may be excessively mixed with respect to the target composition during preparation. For example, what contains a total of 10-80 of a phosphoric acid component and a total of 20-90 a fluoride component is mentioned as a preparation raw material by mol%. Examples of the phosphoric acid component include Al (PO ₃ ) ₃ , NaPO ₃ , LiPO ₃ , P ₂ O _{5 and the} like. In addition, examples of the fluoride component include fluorides such as alkali fluoride, alkaline earth fluoride, Ce, Yb, La, and Lu. In particular, in the case of alkali fluoride, the total composition is 0 to 80, and in the case of alkaline earth fluoride, the total is 0 to 52, and at least one fluoride selected from the group consisting of Ce, Yb, La, and Lu. In the case of a compound, it is preferable to contain 0-40.

(Preferred embodiment)
Hereinafter, preferred embodiments of the present invention will be described. One of the preferred embodiments of the present invention is a light source sealing material for sealing the ultraviolet light source, in which the light from the light source is ultraviolet light having a wavelength of less than 410 nm.

  Unlike an oxide glass, a halide glass containing a halogen such as fluorine is a glass having good transparency from ultraviolet light to infrared light. However, the above-mentioned halide glass is considered to be devitrified by irradiation with ultraviolet light or ionizing radiation, or some kind of defect is generated, and thus is considered to be unsuitable as a sealing material for an ultraviolet light source. For example, Non-Patent Document 1 suggests that an alkali halide crystal composed of an alkali and a halogen generates various point defects and forms a color center when irradiated with ultraviolet rays or ionizing radiation. Since alkali halide crystals are composed of ionic bonds in the same manner as halide glass, it has been expected that halide glasses will also be defective when irradiated with ultraviolet rays or ionizing radiation.

  However, when the present inventors examined the above problems, even if the glass layer of fluoride glass was irradiated with 375 nm ultraviolet light or 266 nm ultraviolet light, the transmission intensity of each ultraviolet light was greatly changed. I can't see. As a result, it was newly found that fluoride glass is useful as a sealing material for ultraviolet light sources.

(Ultraviolet light)
Ultraviolet light refers to light having a wavelength of 200 nm or more and less than 410 nm. In addition, since this embodiment is particularly useful in an ultraviolet light source that emits light having a short wavelength, it may be preferably 380 nm or less, more preferably 300 nm or less.

(Light resistance)
In this specification, the durability of the glass layer against ultraviolet light was evaluated. For measurement, a glass sample for measurement (5 mm × 5 mm, thickness 1.5 mm) is focused and irradiated with laser light of a predetermined wavelength for about 100 hours, and a photodetector (OPHIR 12A-P: high sensitivity thermal sensor). ) Was used for continuous measurement of the transmission intensity of the laser beam that passed through the glass sample, and those having a decrease in transmission intensity of less than 80% were evaluated as having light resistance.

(Optical device)
As an optical device using the ultraviolet light source as described above, a sterilizer using an ultraviolet light source having a wavelength of 200 to 300 nm, a surface sterilizer, a flowing water sterilizer, an air sterilizer, a kitchen sterilizer, and an AlGaN semiconductor light source having a wavelength of 280 to 350 nm And an InGaN / GaN semiconductor light source having a wavelength of 350 nm to 410 nm, or a light receiving element such as a SiC photodiode used in the above wavelength band.

  In the optical device, for example, a light emitting element 10 is installed as a light source at the bottom of the concave surface of the base substrate 20 such as an optical semiconductor package shown in FIG. The glass layer 1 is preferably fired and sealed. Further, the concave space may be sealed without contacting the light emitting element 10.

  Further, for example, as shown in FIG. 1B, the light emitting element 10, the transparent base material 30, the glass layer 1, and the light transmitting material 31 are laminated in this order from the base base material 20 side to form the laminated portion 2. Good. In the drawing, the laminated portion 2 and the base substrate 20 are connected via the connection electrode 21. At this time, the laminated portion 2 may be integrated by bonding the layers, or may be simply laminated and not integrated. When not integrated, in order to further seal the whole, an arbitrary sealing layer may be provided on the outside of the laminated portion 2, and the base substrate 20 and the laminated portion 2 may be integrated.

  In addition, said base base material 20 is a base material for installing a light source, and a shape is not specifically limited. For example, various shapes such as a plate shape as shown in FIG. 1B and a package shape as shown in FIG. 1A have been proposed. The material is preferably at least one selected from the group consisting of sapphire, alumina, GaN, AlN and metal. Examples of the “metal” include Al or Cu, and alloys such as Al and Cu. Moreover, the said metal and alloy may contain Ni, Mo, W, Co, and Fe.

  Between the base substrate 20 and the light emitting element 10, connection electrodes 21 for electrically connecting the light emitting element 10, various circuit patterns (not shown), wiring, metal wires, and the like may be provided.

  1B has the transparent substrate 30, it may or may not be used. When used, it does not appear as long as it transmits light from the light source.

  The light transmitting material 31 is a member that transmits light from the light emitting element 10 and is not particularly limited. For example, there may be mentioned a dispersion layer in which a phosphor capable of converting the wavelength of a lens or light source light is dispersed, a scattering layer in which fine particles are dispersed and light is scattered.

  In addition to the above, an optional third member may be provided. For example, an arbitrary film or layer may be formed between the glass layer 1 and the base substrate 20, the transparent substrate 30, or the light transmitting material 31 as long as the performance is not greatly impaired.

(Deformation)
In addition to the above, the light source may be an infrared light source that emits light of 780 nm to 11000 nm. Moreover, it is good also as 3000 nm or more preferably. As described above, there is no sealing material that can transmit infrared light with respect to an infrared light source, and the use of a sealing material for a light source is not yet common. However, in recent years, various sensors, night vision cameras, and the like are becoming widespread, and usage environments are becoming diversified. The fluorine-containing glass of the present invention is considered to be useful as a sealing material for an infrared light source because it can transmit infrared light that is not transmitted by oxide glass, resin, or the like.

  In addition to the above, a visible light source that emits light of 410 nm or more and less than 780 nm can be used as a matter of course. Since the fluorine-containing glass can have a glass transition temperature of 400 ° C. or lower, damage to the light source and peripheral members can be suppressed by heat during firing.

(Glass material)
The glass material is preferably at least one selected from the group consisting of glass powder, glass paste, glass pellets, and bulk glass.

  The glass paste has improved applicability of the glass powder, and can be obtained by mixing the glass powder and the organic vehicle. When glass paste is used, the glass paste is applied to a desired position and then heated to volatilize the organic vehicle to obtain a glass layer.

  Glass pellets can be obtained by press molding glass powder into a desired shape. When using a glass pellet as a glass material, for example, it is placed on an optical element such as an LED chip and heated to obtain a glass layer. At this time, you may pressurize simultaneously with a heating with a press machine.

  Bulk glass can be obtained by pouring molten glass obtained by melting raw materials into a mold or the like and cooling it. Most of the bulk glass has a plate shape or a block shape, and is placed on an optical element in the same manner as a glass pellet, and a glass layer is obtained by heating, heating, or pressurization.

  The glass material preferably has a glass transition temperature of 400 ° C. or lower. The heat-resistant temperature of the optical element is often 400 ° C. or lower, and the glass material used for the sealing material is preferably heated to 400 ° C. or lower. Fluorine-containing glass can be suitably used because it can have a glass transition temperature of 400 ° C. or lower.

  The heating of the glass material is not particularly limited as long as the glass material used can form a glass layer. In the case of fluorine-containing glass, for example, since the softening point is located at +10 to + 60 ° C. of the glass transition temperature, the glass transition temperature is generally used.

The step of heating the glass material is preferably performed in an inert atmosphere. The inert atmosphere refers to an atmosphere mainly containing no oxygen. For example, an atmosphere filled with N ₂ or Ar can be given. The inert atmosphere may contain a trace amount of H ₂ , Cl _{2, and the} like.

Example 1
In a nitrogen atmosphere, the raw materials were mixed with the composition shown in Table 1 and melted at 850 ° C. for 1 hour. The obtained glass was pulverized in an alumina mortar and then pulverized to a median diameter D ₅₀ = 10 μm using a jet mill (Nissin Engineering SJ-100) to obtain a glass powder. The glass transition temperature _{T g} and the crystallization temperature _{T x} of the obtained glass powder was measured by differential thermal analyzer (manufactured by Rigaku DSC8270).

(Ultraviolet light resistance test)
No. A glass sample for measurement (5 mm × 5 mm, thickness 1.5 mm) was prepared using 1 to 5 glass powders. A laser light source and a photodetector (12A-P made by OPHIR) are installed at a position where the light from the light source can be detected. A condensing lens and a condensing lens are disposed between the laser light source and the light detector. A glass sample for measurement was installed at each point.

Next, laser light was irradiated for about 100 hours from a laser light source, and the transmission intensity of transmitted light during the irradiation time was measured with a photodetector. The wavelengths of the laser light source used were 375 nm and 266 nm, and the power density of the laser light at the condensing point was 100 W / cm ² with a 375 nm laser light source and 6 × 10 ⁵ W / cm ² with a 266 nm laser light source. It was.

  As a result, No. 1 in Example 1 was obtained. It was found that even if any one of the glass samples 1 to 5 was used, there was no significant change in the transmission intensity. Moreover, it turned out that it has light resistance similarly in 375 nm or 266 nm.

(Moisture resistance test)
No. produced A glass sample for measurement (20 mm × 20 mm, thickness 2 mm) was prepared using the glass powder of No. 1 and subjected to a constant temperature and humidity test for 1080 hours in an environment of 85 ° C. and 85% RH. Evaluated. Further, the visible light transmittance at 500 nm and the mass of the sample before and after the constant temperature and humidity test were measured. The appearance photograph of the sample before and after the test is shown in FIG.

  As a result, the transmittance at a wavelength of 500 nm decreased by 7% after the test, but no white turbidity occurred as shown in FIG. Moreover, the mass change of the sample before and after the test was the lower limit of measurement (0.05% or less).

(Water resistance test)
A glass sample for measurement similar to the above-described moisture resistance test was prepared, and the test was performed by a method in accordance with JIS 3254-1995 “Method for testing chemical durability of fluoride glass”. In this method, the sample is immersed in water at 30 ° C., and the elution rate of the glass composition components is calculated from the mass reduction. In this test, the dissolution rate was measured after the sample was immersed in water for one month. Moreover, the external appearance photograph of the sample before and behind a test is shown in FIG.

The dissolution rate Q is given by the following equation.
Q [g / cm ² · d] = (W ₀ −W ₁ ) / (t × s)
However, W ₀ : mass before test [g], W ₁ : mass after test [g], t: elution time [d], s: sample surface area [cm ² ].

As a result, the surface of the sample became cloudy as shown in FIG. The elution rate was 6.87 × 10 ⁻³ g / cm ² · d.

Comparative Example 1
Glass powder as oxide glass: except for using _{(5SiO 2 -35B 2 O 3 -35ZnO} -25Bi 2 O 3 mol%) was prepared for measurement of glass samples in the same manner as in Example 1. Using the obtained glass sample, a 266 nm laser light source was condensed and irradiated in the same manner as in Example 1 (power density was 6 × 10 ⁵ W / cm ² at the condensing point). Broke.

  In order to investigate the cause of the above breakage, No. A glass having a composition of 1 and a bulk body of an oxide glass having a composition of Comparative Example 1 were prepared and polished to prepare a measurement sample (6 × 6 mm, thickness 2 mm). The transmission sample of 200-700 nm was measured for the obtained measurement sample using a spectrophotometer (manufactured by HITACHI, U4100). As a result, as shown in FIG. 2, it was found that the oxide glass of Comparative Example 1 has absorption at 266 nm. Therefore, the sample of Comparative Example 1 is considered to be broken because it absorbs a wavelength of 266 nm.

Comparative Example 2
The phenyl silicone resin was cured and molded into a plate shape of 6 mm × 6 mm and thickness 2 mm to obtain a measurement sample. Next, when a laser beam having a wavelength of 375 nm was continuously irradiated at a power density of 10 ² W / cm at room temperature, the light irradiation part turned white 35 hours after irradiation.

  As a result, No. 1 in Example 1 was obtained. It turned out that all the glass samples of 1-5 have high durability to ultraviolet light compared with oxide glass and resin. Moreover, although it became cloudy when immersed in water, it turned out that cloudiness is suppressed in moisture resistance tests, such as a constant temperature and humidity test.

2: Creation of optical device First, a Cu-based metal substrate (Cu-0.1Fe-0.03P (mass%), coefficient of thermal expansion: 17.5 ppm / ° C) with Ni and Ag coating on the surface, pure aluminum (A1050) Using a metal package having a reflector, an LED element (emission peak wavelength: 365 nm) was mounted on the metal substrate by wire bonding. Further, a bulk glass of fluoride glass having a thickness of 1.5 mm (created as No. 1 in Table 1) was installed on the LED element to obtain a laminate.

  Next, the metal substrate surface (the back surface on which the LED element is not mounted) of the laminate and the surface of the bulk glass were sandwiched between brown polyimides, respectively, to obtain a firing sample. The brown polyimide of the sample for firing is placed in contact with the SUS304 flat plate for pressurization of the hot press device, and the glass material is fired by pressurizing and heating at 290 ° C., pressure 0.5 MPa for 3 minutes. To obtain an optical device.

  When the obtained optical device was energized, light emission with a wavelength of 365 nm was obtained through the glass layer, and it was confirmed that it functions as a light source sealing material.

  As mentioned above, it became clear that fluorine-containing glass is useful as a sealing material for light sources.

1: Glass layer, 2: Laminated portion, 10: Light emitting element, 20: Base substrate, 21: Connection electrode, 30: Transparent substrate, 31: Light transmitting material

Claims (7)

A sealing material for a light source in which a sealing material for sealing a light source is disposed at a position where light from the light source can enter, the sealing material being a glass of fluorine-containing glass that transmits the light from the light source A sealing material for a light source, which is a layer. 2. The light-source sealing material according to claim 1, wherein in the fluorine-containing glass, 30 mol% or more of all anions constituting the glass is fluorine. 3. The light source sealing material according to claim 1, wherein the fluorine-containing glass is fluoride glass or fluorophosphate glass. The light source sealing material according to any one of claims 1 to 3, wherein light from the light source is ultraviolet light having a wavelength of less than 410 nm. The composition of the fluorine-containing glass is mol%,
AlF ₃ from 0 to 45,
30 to 60 in total of fluoride of Hf and fluoride of Zr,
A total of 20 to 65 alkaline earth fluorides,
A total of 0 to 25 fluorides selected from the group consisting of Y, La, Gd, and Lu,
5. The light-source sealing material according to claim 1, comprising a total of 0 to 25 at least one fluoride selected from the group consisting of Na, Li, and K. 6. It is a glass material for forming the sealing material for light sources in any one of Claim 1 thru | or 5, This glass material is chosen from the group which consists of glass powder, a glass paste, a glass pellet, and bulk glass. A glass material for a sealing material for a light source, wherein the glass material is at least one. The glass material for a light source sealing material according to claim 6, wherein the glass material has a glass transition temperature of 400 ° C. or lower.