JP2019021463A - Light emitting device - Google Patents

Abstract

To provide a light emitting device that can restrain a light source part from being deteriorated by corrosive gas.SOLUTION: An illuminating device 1 serving as a light emitting device comprises a main body 2, a light source 3, a translucent body 4 for transmitting light emitted from the light source 3, and a corrosive gas trapping material 17 for trapping corrosive gas. The light source 3 and the corrosive gas trapping material 17 are arranged in an internal space 14 formed by the main body 2 and the translucent body 4. The corrosive gas to be trapped by the corrosive gas trapping material 17 may include at least one of halogen gas, nitrogen oxide, sulfur compound gas, and ammonia.SELECTED DRAWING: Figure 3

Description

  The present invention relates to a light emitting device.

  An illumination device using a light emitting element such as a light emitting diode (LED) is widely used. Patent Document 1 below discloses a technology for suppressing deterioration of an LED module by sealing a predetermined gas in a housing that houses the LED module and hermetically sealing the bulb-type LED lamp.

International Publication No. 2014/045489

  In the case of a small-scale lighting device such as a bulb lamp, it is relatively easy to hermetically seal. On the other hand, it is difficult to completely hermetically seal in a device such as a large LED lighting. In such an apparatus, there is a possibility that the light source unit is deteriorated by corrosive gas flowing into the apparatus from the outside or corrosive gas generated from components inside the apparatus.

  SUMMARY An advantage of some aspects of the invention is that it provides a light-emitting device that can suppress deterioration of a light source unit due to corrosive gas.

  A light emitting device according to the present invention includes a main body, a light source unit, a translucent body that transmits light emitted from the light source unit, and a corrosive gas capturing material that captures corrosive gas. A light source part and a corrosive gas trapping material are arranged in an internal space formed by the body.

  According to the present invention, since the light source unit and the corrosive gas capturing material are disposed in the internal space formed by the main body and the light transmitting body, it is possible to suppress deterioration of the light source unit due to corrosive gas. .

It is the perspective view which looked at the illuminating device as a light-emitting device by Embodiment 1 from diagonally downward. It is a bottom view of the illuminating device shown in FIG. It is typical sectional drawing of a part of illuminating device shown in FIG.1 and FIG.2.

  Hereinafter, embodiments will be described with reference to the drawings. In the drawings, common or corresponding elements are denoted by the same reference numerals, and redundant description is simplified or omitted.

Embodiment 1 FIG.
FIG. 1 is a perspective view of an illuminating device 1 as a light emitting device according to Embodiment 1 as viewed obliquely from below. FIG. 2 is a bottom view of the lighting device 1 shown in FIG. The illuminating device 1 shown in these drawings is installed on a ceiling and can be used for illuminating a space below the illuminating device 1 by irradiating light downward. The illuminating device 1 may be usable as a device that emits a light flux of, for example, several thousand lumens to tens of thousands of lumens. The lighting device 1 may be used by being installed on a high ceiling of a factory, a warehouse, a gymnasium, a competition facility, or the like, for example.

  As shown in FIG. 2, the lighting device 1 includes a main body 2, a light source unit 3, a translucent body 4, an outer frame 5, and an inner frame 6. When the lighting device 1 is used, the bottom surface of the lighting device 1 is substantially horizontal. In the present embodiment, the shape of the main body 2 when viewed from the direction of the apparatus central axis is substantially circular. As a modification, the shape of the main body 2 when viewed from the direction of the central axis of the device may be a shape other than a circle, such as a rectangle or a square.

  A plurality of light source units 3 are arranged inside the main body 2. The light source unit 3 in the present embodiment includes a light emitting diode (LED). The light source unit 3 is provided so as to be able to conduct heat to the main body 2. The heat generated in the light source unit 3 is conducted to the main body 2. The light source unit 3 in the present embodiment includes a chip-on-board (COB) type LED light source. The light source unit 3 may come into contact with the main body 2 via a heat conductive material. The heat conductive material may be, for example, a heat conductive sheet, a heat conductive grease, a heat conductive adhesive, or a heat conductive double-sided pressure-sensitive adhesive tape.

  As a modified example, the light source unit 3 may include an LED light source other than the COB type. For example, the light source unit 3 may include at least one of a surface-mounted LED package, a bullet-type LED package, an LED package with a light distribution lens, and an LED of a chip scale package. The light source unit 3 is not limited to the one provided with the LED, and may include a light emitting element such as an organic electroluminescence (EL) element or a semiconductor laser. The light source substrate of the light source unit 3 may contact the main body 2 directly or via a heat conductive material. The light source substrate of the light source unit 3 and the main body 2 may be integrally formed.

  As shown in FIG. 1, the main body 2 has a plurality of heat radiation fins 2a. The main body 2 cools the light source unit 3 by dissipating the heat generated in the light source unit 3 to the surrounding air. The main body 2 has a function as a heat sink. The heat radiating fins 2 a protrude from the upper surface of the main body 2. Each radiation fin 2a in the present embodiment has a plate shape. By increasing the surface area of the main body 2 by the radiation fins 2a, the heat generated in the light source unit 3 can be efficiently dissipated. As a result, since the temperature of the light source unit 3 can be lowered, the energy efficiency of the light source unit 3, that is, the light emission efficiency is improved, and the life of the light source unit 3 can be extended.

  The plurality of radiating fins 2a are arranged radially. Each of the plurality of heat radiating fins 2 a extends radially outward from the central region of the main body 2. As a modification, a plurality of plate-like heat radiation fins 2a may be arranged in parallel to each other. As another modification, the heat radiation fin 2a may be a pin fin having a pin shape.

  The main body 2 is preferably made of a metal material that is lightweight and has high thermal conductivity. Examples of such a metal material include aluminum, an aluminum alloy, a copper alloy, and stainless steel. The main body 2 may be integrally formed by, for example, a die casting method. Alternatively, the main body 2 may be formed by bonding a plurality of heat radiation fins 2a to the base by a method such as caulking, screwing, adhesion, welding, brazing, or the like.

  The main body 2 has an opening on the bottom surface. The translucent body 4 is attached so as to close the opening on the bottom surface of the main body 2. The light emitted from the light source unit 3 passes through the light transmitting body 4 and is irradiated to the outside of the illumination device 1. The translucent body 4 may be made of a transparent material that transmits light regularly. Alternatively, the translucent body 4 may diffuse and transmit light. The translucent body 4 may be made of, for example, a resin material such as polycarbonate resin, acrylic resin, polystyrene resin, or glass material. The translucent body 4 has a plate shape. As a modification, the translucent body 4 may have a function of controlling light rays, such as a lens or a prism.

  The translucent body 4 is attached to the main body 2 via the outer frame 5 and the inner frame 6. In the present embodiment, the translucent body 4 has a circular outer shape. A circular opening is formed in the central portion of the translucent body 4. The outer frame 5 and the inner frame 6 are each fixed to the main body 2 with a plurality of screws. The outer frame 5 has an annular shape along the outer edge of the translucent body 4. The outer frame 5 holds the outer edge of the translucent body 4. The inner frame 6 holds the edge of the circular opening at the central portion of the translucent body 4.

  The lighting device 1 according to the present embodiment further includes a power supply device 7. The power supply device 7 is installed on the main body 2. An electronic circuit board having a light source driving circuit for supplying a current for turning on the light source unit 3 and the like are disposed inside the casing of the power supply device 7. A cable 8 is connected to the power supply device 7. AC power from an external AC power supply is supplied to the power supply device 7 by the cable 8. The AC power is converted into DC power by the light source driving circuit and supplied to the light source unit 3. As a modification, the lighting device 1 may not include the power supply device 7. That is, the lighting device 1 may be lit by DC power supplied from an external power supply device.

  The lighting device 1 according to the present embodiment further includes a main body support 9. The main body support 9 supports the main body 2. The main body support 9 includes an elongated plate-like fixing portion 9a and a pair of arm portions 9b protruding from both ends of the fixing portion 9a. The fixing portion 9a of the main body support 9 is fixed to a mounting surface such as a ceiling or a beam of a building. The fixing portion 9a has a hole through which a bolt for fixing to the mounting surface is passed. Each arm portion 9b protrudes in a direction perpendicular to the longitudinal direction of the fixed portion 9a. A long hole 9c curved in an arc shape is formed at the tip of each arm portion 9b. Each arm portion 9 b of the main body support 9 is connected to the main body 2 so as to be relatively rotatable around the bolt 10. The bolt 11 passes through the elongated hole 9 c of the arm portion 9 b of the main body support 9 and is inserted into a screw hole provided in the main body 2. When the lighting device 1 is installed, the body support 9 is fixed so as not to rotate relative to the body 2 by tightening the bolts 10 and 11.

  In the state of FIG. 1, the fixing portion 9 a is parallel to the bottom surface of the main body 2. When the mounting surface is horizontal, the fixing portion 9a of the main body support 9 is fixed to the mounting surface in this state. Thereby, the illuminating device 1 is fixed with the appropriate attitude | position which the bottom face of the main body 2 becomes horizontal. On the other hand, when the attachment surface is an inclined surface inclined with respect to the horizontal plane, the angle of the main body support 9 with respect to the main body 2 so that the arm portion 9b of the main body support 9 is perpendicular to the inclined surface. Can be changed. That is, when the bolts 10 and 11 are loosened, the main body support 9 can be rotated around the bolt 10, and the main body support 9 can be inclined with respect to the main body 2. When the main body support 9 is inclined with respect to the main body 2, the bolt 11 is moved relative to the elongated hole 9c. By tightening the bolts 10 and 11 again, the main body support 9 can be fixed at the position of the inclination angle. In this way, when the mounting surface is an inclined surface, the fixing portion 9a can be inclined so that the arm portion 9b of the main body support 9 is perpendicular to the inclined surface. Thereby, the illuminating device 1 can be installed with a suitable attitude | position.

  In the illustrated example, a fall prevention wire 100 is connected to the main body support 9. Even if the bolt that fixes the fixing portion 9a of the main body support 9 to the mounting surface is loosened, the fall prevention wire 100 can reliably prevent the lighting device 1 from falling.

  As shown in FIG. 2, the illumination device 1 of the present embodiment further includes a first reflector 12 and a second reflector 13. One first reflector 12 is provided for each light source unit 3. A plurality of first reflectors 12 are supported by one second reflector 13.

  FIG. 3 is a schematic cross-sectional view of a part of the illumination device 1 shown in FIGS. 1 and 2. FIG. 3 corresponds to a cross-sectional view taken along a plane including the central axis of the lighting device 1. In addition, the attitude | position of the illuminating device 1 in FIG. 3 is an upside down attitude | position with respect to the time of use of the illuminating device 1. FIG.

  As shown in FIG. 3, an internal space 14 of the lighting device 1 is formed by the main body 2 and the translucent body 4. In the internal space 14, the light source unit 3, the first reflector 12, and the second reflector 13 are arranged. The first reflector 12 and the second reflector 13 are separate parts from the light source unit 3.

  The first reflector 12 has a reflecting surface 12a. The reflection surface 12 a is a surface inclined with respect to the optical axis AX of the light source unit 3. The reflection surface 12 a is formed on the entire circumference so as to surround the optical axis AX of the light source unit 3. Of the light emitted from the light source unit 3, the light emitted to the side is reflected by the reflecting surface 12 a and enters the light transmitting body 4. Thereby, it is possible to increase the amount of light irradiated from the translucent body 4 to the outside.

  The 2nd reflector 13 has the reflective surface 13a. The reflection surface 13 a is a surface perpendicular to the optical axis AX of the light source unit 3. The reflecting surface 13 a reflects light toward the light transmitting body 4. By providing the reflecting surface 13a, it is possible to reduce luminance unevenness when the light transmitting body 4 is viewed from the outside. The reflecting surfaces 12a and 13a may be white.

  The lighting device 1 further includes sealing members 15 and 16 for hermetically sealing the internal space 14. The sealing member 15 is arranged in an annular shape along the outer edge portion of the translucent body 4. The sealing member 15 seals a gap between the main body 2 and the outer frame 5 and the outer edge portion of the translucent body 4. The sealing member 16 is arranged in an annular shape along the edge of the circular opening at the central portion of the translucent body 4. The sealing member 16 seals a gap between the main body 2 and the inner frame 6 and the edge of the circular opening at the central portion of the light transmitting body 4. If it is this Embodiment, the sealing members 15 and 16 can be provided, and the airtightness of the internal space 14 can be improved. For this reason, it is possible to prevent moisture or dust from the outside from flowing into the internal space 14.

  The lighting device 1 further includes a corrosive gas capturing material 17 that captures corrosive gas. The corrosive gas capturing material 17 is disposed in the internal space 14. The corrosive gas capturing material 17 captures corrosive gas in the internal space 14.

The corrosive gas is a gas having a property of corroding the metal used in the light source unit 3. The “metal used in the light source unit 3” is, for example, a metal material included in the composition of at least one of a lead plating material, an electrode material, and a die bond material used in the light source unit 3. Typically, “the metal used for the light source unit 3” includes at least one of silver, copper, and aluminum. “The gas having the property of corroding the metal used for the light source unit 3” is, for example, at least one of halogen gas, nitrogen oxide, sulfur compound gas, and ammonia. “Halogen gas” is, for example, Cl ₂ . “Nitrogen oxide” is, for example, NO ₂ or NO. The “sulfur compound gas” is, for example, SO ₂ or H ₂ S.

  The corrosive gas is contained in, for example, automobile exhaust gas, sewage gas leaking from a drain pipe, gas volatilized from a chemical, gas flowing from a hot spring area or a volcanic area, and the like. Corrosive gas is also generated in relation to fossil fuel combustion, geothermal power generation facilities, sewage treatment, water treatment, papermaking, waste incineration, iron making, papermaking, biodegradation, chemical fertilizer manufacturing, etc. To do. Corrosive gas resulting from these may be present in the external space of the lighting device 1. The airtightness of the internal space 14 by the sealing members 15 and 16 is not necessarily perfect. In particular, in a relatively large device such as the lighting device 1, it is difficult to completely maintain the airtightness of the internal space 14 over a long period of time. For this reason, corrosive gas outside the lighting device 1 may enter the internal space 14. Further, there is a possibility that corrosive gas is generated from the resin material used for the components arranged in the internal space 14.

  As the concentration of the corrosive gas in the internal space 14 is higher, the life of the light source unit 3 tends to be shorter. In the present embodiment, the corrosive gas can be captured by the corrosive gas capturing material 17 before the light source unit 3 is exposed to the corrosive gas. For this reason, it can suppress reliably that the light source part 3 receives the influence of corrosive gas, and deteriorates. Moreover, since the density | concentration of the corrosive gas of the internal space 14 can be maintained low, it can prevent reliably that the lifetime of the light source part 3 becomes short.

  At least a part of the corrosive gas capturing material 17 may have, for example, at least one of a sheet form, a paste form, and a coating form.

  The corrosive gas trapping material 17 may include a trapping substance that traps the corrosive gas by chemically bonding with the corrosive gas. For example, the corrosive gas capturing material 17 may include the same type of metal as that used in the light source unit 3. Further, the corrosive gas capturing material 17 may include at least one of silver, copper, and aluminum. The corrosive gas capturing material 17 may include at least one of silver, copper, and aluminum as an alloy. When the corrosive gas capturing material 17 contains these capturing substances, the corrosive gas that corrodes the metal used in the light source unit 3 can be captured more reliably. As a result, the light source unit 3 can be more reliably prevented from being affected by the corrosive gas.

  The corrosive gas trapping material 17 may include a trapping substance that traps the corrosive gas by physically absorbing or adsorbing the corrosive gas. For example, the corrosive gas capturing material 17 may include a porous material such as activated carbon, silica, or alumina.

  The corrosive gas trapping material 17 may have a structure in which the trapping substance as described above is dispersed in a holding body. The shape of the capture material may be, for example, powder, bulk, or flake. The holding body may be, for example, at least one of rubber, resin, cork, paper, cellulosic member, adhesive, and pressure-sensitive adhesive.

  The lighting device 1 according to the present embodiment further includes a removing material 18. The removal material 18 is disposed in the internal space 14. The removing material 18 may be removed by absorbing or adsorbing moisture, that is, moisture in the internal space 14. The removing material 18 may be removed by absorbing or adsorbing oil in the internal space 14. The removing material 18 may include a known desiccant and an oil adsorbing material. The removing material 18 is an example of a removing unit that removes at least one of moisture and oil in the internal space 14. When moisture or oil coexists with the corrosive gas, the corrosion by the corrosive gas tends to proceed easily. By removing at least one of the moisture and oil in the internal space 14 by the removing means, it is possible to more reliably prevent the light source unit 3 from being affected by the corrosive gas. In the illustrated example, the removing material 18 is provided separately from the corrosive gas capturing material 17. In the illustrated example, the removing material 18 is attached to the surface of the second reflector 13 opposite to the reflecting surface 13a. As a modification, the removal material 18 may be disposed at another position. Further, as a modification, a removing means such as the removing material 18 may be provided integrally with the corrosive gas capturing material 17.

  The lighting device 1 may include at least one of the corrosive gas capturing materials 17a to 17g described below as the corrosive gas capturing material 17. The corrosive gas capturing materials 17 a and 17 b are attached to the first reflector 12. Thereby, since it can suppress that the heat of the light source part 3 heat-transfers to the corrosive gas capture | acquisition materials 17a and 17b, the temperature of the corrosive gas capture | acquisition materials 17a and 17b cannot rise easily. Therefore, it is possible to reliably suppress the corrosive gas capturing materials 17a and 17b from being deteriorated by heat. The corrosive gas capturing materials 17a and 17b may be provided over the entire circumference of the first reflector 12 surrounding the optical axis AX.

  The corrosive gas trapping material 17 a is attached to the reflective surface 12 a of the first reflector 12. The corrosive gas capturing material 17b is attached to the surface of the first reflector 12 opposite to the reflecting surface 12a. If it is corrosive gas capture material 17b, it can prevent that the reflection by the reflective surface 12a becomes obstructed.

  The corrosive gas capturing materials 17 c and 17 d are attached to the second reflector 13. Thereby, since it can suppress that the heat of the light source part 3 transfers to the corrosive gas capture | acquisition materials 17c and 17d, the temperature of the corrosive gas capture | acquisition materials 17c and 17d does not rise easily. Therefore, it is possible to reliably suppress the corrosive gas capturing materials 17c and 17d from being deteriorated by heat. The corrosive gas capturing material 17 c is attached to the reflecting surface 13 a of the second reflector 13. The corrosive gas capturing material 17d is attached to the surface of the second reflector 13 on the side opposite to the reflecting surface 13a. If it is corrosive gas capture material 17d, it can prevent that the reflection by the reflective surface 13a becomes obstructed.

  The corrosive gas capturing material 17 e is disposed adjacent to the light source unit 3. Since the corrosive gas capturing material 17e can capture the corrosive gas approaching the light source unit 3 more reliably, the light source unit 3 can be more reliably prevented from being affected by the corrosive gas.

  The corrosive gas capturing material 17 f is disposed adjacent to the sealing member 15. The corrosive gas capturing material 17 f is located in the air passage from the sealing member 15 to the light source unit 3. When the corrosive gas in the external space enters the internal space 14 through the gap of the sealing member 15, the corrosive gas capturing material 17 f removes the corrosive gas before reaching the light source unit 3. It can be reliably captured. For this reason, it can prevent more reliably that the light source part 3 receives the influence of corrosive gas.

  The corrosive gas capturing material 17 g is disposed adjacent to the sealing member 16. The corrosive gas capturing material 17 g is located in the air passage from the sealing member 16 to the light source unit 3. When the corrosive gas in the external space enters the internal space 14 through the gap of the sealing member 16, the corrosive gas capturing material 17 g removes the corrosive gas before reaching the light source unit 3. It can be reliably captured. For this reason, it can prevent more reliably that the light source part 3 receives the influence of corrosive gas.

  The corrosive gas capturing materials 17 f and 17 g are attached to the inner wall surface of the main body 2. The corrosive gas capturing materials 17 f and 17 g can conduct heat to the main body 2. The corrosive gas capturing materials 17 f and 17 g may be in direct contact with the inner wall surface of the main body 2. The corrosive gas capturing materials 17f and 17g may come into contact with the inner wall surface of the main body 2 via a heat conductive material. The heat conductive material may be, for example, any one of a heat conductive sheet, a heat conductive grease, a heat conductive adhesive, and a heat conductive double-sided pressure-sensitive adhesive tape. The main body 2 corresponds to a heat sink having heat radiation fins 2a. Since the heat radiating fins 2a dissipate heat to the external space, the temperature of the main body 2 is relatively low. The internal space 14 may become high temperature due to the heat of the light source unit 3. When the heat in the internal space 14 is transmitted to the corrosive gas trapping materials 17f and 17g, the heat is transferred to the relatively low temperature main body 2, whereby the temperature rise of the corrosive gas trapping materials 17f and 17g is suppressed. For this reason, the corrosive gas capturing materials 17f and 17g are unlikely to become high temperature. Therefore, the corrosive gas capturing materials 17f and 17g can be reliably suppressed from being deteriorated by heat.

  The corrosive gas capturing materials 17 c to 17 g may be arranged so as to extend along a circumferential direction centering on the central axis of the main body 2. The corrosive gas capturing materials 17 c to 17 g may be arranged annularly over the entire circumference in the circumferential direction centering on the central axis of the main body 2.

  It is desirable that the total amount of the corrosive gas capturing material 17 disposed in the internal space 14 is secured in a sufficient amount so that the corrosive gas can be captured while the lighting device 1 is used for a long period of time.

  The movable member 19 is slidable along the surface of the corrosive gas capturing material 17g. The movable member 19 has a function as a wiper that wipes the surface of the corrosive gas capturing material 17g. In the illustrated example, the movable member 19 is attached to the translucent body 4. For example, when the lighting device 1 is regularly inspected, the movable member 19 becomes corrosive when the light-transmitting body 4 is rotated by temporarily loosening the screws fixing the outer frame 5 and the inner frame 6. It slides along the surface of the gas trapping material 17g. Thereby, the surface layer of the corrosive gas capturing material 17g can be removed.

  If a layer of a reaction product with the corrosive gas is formed on the surface of the corrosive gas trapping material 17g, the performance of the corrosive gas trapping material 17g may be lowered. By periodically removing the surface layer of the corrosive gas capturing material 17g by the movable member 19, the surface of the corrosive gas capturing material 17g can be updated to a fresh surface. Thereby, the performance of the corrosive gas capturing material 17g can be recovered.

  As a modification, the lighting device 1 may include an actuator for sliding the movable member 19 along the surface of the corrosive gas capturing material 17g. Moreover, you may provide the movable member which has the same function with respect to the corrosive gas trapping material 17 other than the corrosive gas trapping material 17g.

  The light emitting device of the present invention can be applied to devices other than lighting devices. For example, the present invention may be applied to a display device that emits light. The display device may be, for example, a display unit of an electric device, a remote control of the electric device, a smartphone, a tablet terminal, a television, or the like.

DESCRIPTION OF SYMBOLS 1 Illuminating device, 2 Main body, 2a Radiation fin, 3 Light source part, 4 Translucent body, 5 Outer frame, 6 Inner frame, 7 Power supply device, 10, 11 Bolt, 12 1st reflector, 13 2nd reflector, 14 Internal space 15, 16 Sealing member, 17, 17a, 17b, 17c, 17d, 17e, 17f, 17g Corrosive gas trapping material, 18 removing material, 19 movable member

Claims (11)

The body,
A light source unit;
A translucent body that transmits light emitted from the light source unit;
A corrosive gas trapping material for trapping corrosive gas;
With
The light source device and the corrosive gas capturing material are disposed in an internal space formed by the main body and the light transmitting body.   The light-emitting device according to claim 1, wherein the corrosive gas capturing material includes the same type of metal as that used in the light source unit.   The light emitting device according to claim 1, wherein the corrosive gas capturing material includes at least one of silver, copper, and aluminum.   The light emitting device according to any one of claims 1 to 3, further comprising a removing unit that removes at least one of moisture and oil in the internal space. Comprising a reflector disposed in the internal space;
The light-emitting device according to any one of claims 1 to 4, further comprising the corrosive gas capturing material attached to the reflector.   The light-emitting device according to claim 1, further comprising the corrosive gas trapping material disposed adjacent to the light source unit. A sealing member for sealing the internal space;
The light emitting device according to claim 1, further comprising the corrosive gas capturing material disposed in an air passage from the sealing member to the light source unit. A sealing member for sealing the internal space;
The light emitting device according to claim 1, further comprising the corrosive gas capturing material disposed adjacent to the sealing member. A heat sink having heat dissipating fins for dissipating heat of the light source unit to the external space;
The light emitting device according to any one of claims 1 to 8, further comprising the corrosive gas capturing material in contact with the heat sink directly or through a heat conductive material.   The light emitting device according to any one of claims 1 to 9, further comprising a movable member that is slidable along a surface of the corrosive gas capturing material.   11. The corrosive gas captured by the corrosive gas capturing material includes at least one of a halogen gas, a nitrogen oxide, a sulfur compound gas, and ammonia. Light emitting device.

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