JP2015043442A - Phosphor coating device, and method for manufacturing light emitting device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a phosphor coating device in which no phosphor precipitates in a pipe for feeding phosphor mixed liquid when forming a phosphor dispersion film by a spray method, no uneven concentration is caused even if coating work is repeatedly performed, and the phosphor dispersion film having uniformly dispersed phosphors can be formed, and to provide a method for manufacturing a light emitting device capable of continuously manufacturing the light emitting device including the phosphor dispersion film having the uniformly dispersed phosphors using this phosphor coating device.SOLUTION: A phosphor coating device 10 comprises stirring means 30 for stirring phosphor mixed liquid 20 in a pipe 13 for feeding the phosphor mixed liquid 20 from a tank 11 for storing the phosphor mixed liquid to a spray nozzle 14. The method for manufacturing the light emitting device includes a stirring and coating process in a pipe to apply the phosphor mixed liquid 20 stirred and mixed in the pipe 13 by spraying it from the spray nozzle 14, using the phosphor coating device 10.

Description

  The present invention relates to a light-emitting device having a light-emitting element and a wavelength conversion unit including a phosphor that converts the wavelength of light emitted from the light-emitting element. The present invention relates to a method for manufacturing a light emitting device using a phosphor coating device.

  Conventionally, a light-emitting device (LED light source) including an LED light-emitting element that emits light of a predetermined color and a wavelength conversion unit in which a phosphor that converts light emitted from the LED light-emitting element into light of a desired color is dispersed is known. ing.

  For example, a phosphor such as a YAG phosphor is disposed in the vicinity of a gallium nitride (GaN) -based blue LED (Light Emitting Diode) chip, and the blue light emitted from the blue LED chip and the phosphor is blue light. In general, a technique for obtaining a white LED by mixing with yellow light emitted by secondary light emission in response to the light is widely used.

  At this time, in order to obtain white light emission with a uniform color tone, a phosphor dispersed glass (wavelength conversion unit) in which a phosphor is uniformly dispersed in a transparent resin is used, and an LED light emitting element is formed in this film material. Therefore, it is important to uniformly mix blue light emitted from the fluorescent material and yellow light emitted from the phosphor so as to uniformly emit white light that is mixed color light outside the glass body.

  The wavelength converter (phosphor-dispersed glass) can be created, for example, by mixing glass powder and phosphor powder, adding a resin binder, press-molding it into a predetermined shape, and firing it. In addition, a phosphor dispersion liquid (wavelength conversion portion) having a predetermined thickness may be formed by spray-coating a liquid phosphor mixture produced by blending phosphor powder with alcohol or a resin binder and then curing the mixture. it can.

  In addition, stirring is performed so that the density of the phosphor in the binder is constant, and coating is performed while maintaining the density of the phosphor mixture. For example, the density of the phosphor in the binder is substantially Have already been proposed (see, for example, Patent Document 1). The method and apparatus for forming a light-emitting device have a step of holding while stirring so as to be constant, and a step of applying a desired amount while maintaining the density.

JP-A-10-233533

  As described above, a phosphor dispersion film can be formed on the light emitting surface of a light emitting element to form a light emitting device that emits light with a predetermined color. In addition, a phosphor dispersion film exhibiting a uniform luminescent color by applying a stirrer to the tank or spray means for storing the phosphor mixture and stirring while keeping the density of the phosphor constant. Can be generated.

  In particular, when preparing a large amount of phosphor mixture using a large tank in order to continuously apply a large amount of phosphor, install the tank in another location and connect the piping to the spray means. The phosphor mixture liquid is fed via. Even with such a configuration, it is possible to suppress variation in the density of the phosphors by disposing the stirring device in the tank or the spray unit for storing the phosphor mixture.

  However, even if a stirrer is provided in the tank or spray means, the phosphor mixture will stop flowing if the phosphor coating operation is not performed, so that the phosphor will precipitate. In addition, the phosphor may adhere to the pipe. Due to the precipitation and adhesion of the phosphor in this pipe, even if the phosphor mixture is stirred in the tank and spray means, repeated application operations may cause uneven density in the applied phosphor layer. I understood.

  In particular, when performing phosphor coating work continuously in large quantities, the phosphor coating work is performed intermittently, resulting in phosphor concentration unevenness in the piping in the first half and second half of the work. In other words, even in the same lot of products, density unevenness occurs in the phosphor layer of the light emitting device, which causes a problem.

  When density unevenness occurs in the phosphor layer, unevenness occurs in the ratio of converting the color emitted from the light emitting element, and the chromaticity changes without obtaining a uniform emission color. For this reason, even in the same lot of light emitting devices, there is a problem that uniform chromaticity cannot be obtained.

  In addition, in order to suppress such chromaticity change, when the phosphor coating operation is stopped, it is necessary to discharge all the phosphor mixed solution in the pipe before the next coating operation, It is not preferable because maintenance is required to remove the body.

  Therefore, in the case where the phosphor mixture solution is repeatedly fed from the tank storing the phosphor mixture solution to the spray means via the pipe and the coating operation is repeatedly performed, the phosphor does not precipitate and does not adhere in the pipe. A phosphor coating apparatus configured as described above is required. In addition, by using this phosphor coating apparatus, a light emitting device that has a phosphor dispersion film in which phosphors are uniformly dispersed and that exhibits a uniform emission color without causing a change in chromaticity is continuously manufactured. Is required.

  Therefore, in the present invention, when forming the phosphor dispersion film by the spray method, the phosphor does not settle in the pipe for feeding the phosphor mixture, and even if the coating operation is repeated, density unevenness does not occur, Provided is a phosphor coating device capable of forming a phosphor dispersion film in which phosphors are uniformly dispersed. A light emitting device having a phosphor dispersion film in which phosphors are uniformly dispersed using the phosphor coating device. It is an object of the present invention to provide a method for manufacturing a light emitting device that can be manufactured continuously.

  To achieve the above object, the present invention provides a tank for storing a phosphor mixture, a spray nozzle for spraying the phosphor mixture on an object to be coated, and a pipe for feeding the phosphor mixture from the tank to the spray nozzle. A phosphor coating apparatus that is used to form a wavelength conversion unit including a phosphor that coats the phosphor mixture on the light emitting surface of the light emitting element and converts the wavelength of light emitted from the light emitting element. The light emitting element is an LED light emitting element, and the phosphor mixed liquid in which a predetermined phosphor is dispersed is sprayed from the spray nozzle onto the light emitting surface of the LED light emitting element mounted on the LED substrate. In addition, a stirring means for stirring the phosphor mixture in the pipe is provided.

  According to the above configuration, the phosphor mixed solution fed from the tank to the spray nozzle through the pipe is sprayed on the light emitting surface as the application target in a state of being stirred in the pipe, resulting in uneven density of the phosphor. Thus, it is possible to obtain a phosphor coating apparatus capable of forming a phosphor dispersion film in which phosphors are uniformly dispersed even when repeated coating operations are performed.

  In the phosphor coating apparatus having the above-described configuration, the pipe has a main path and a circulation path, and the stirring unit moves the mixture liquid along the circulation path and the main path. It has the device. According to this configuration, since it is sprayed from the spray nozzle after being circulated in the circulation path, the phosphor concentration mixed in the phosphor mixture is less likely to cause unevenness, and the phosphor is uniformly dispersed. A dispersion film can be formed.

  According to the present invention, in the phosphor coating apparatus configured as described above, the mixed liquid moving apparatus is a mixed liquid circulating apparatus that circulates the phosphor mixed liquid along the circulation path and the main path. According to this configuration, since it is sprayed from the spray nozzle after being circulated in the circulation path, the phosphor concentration mixed in the phosphor mixture is less likely to cause unevenness, and the phosphor is uniformly dispersed. A dispersion film can be formed.

  Further, the present invention is the phosphor coating apparatus having the above-described configuration, wherein the mixed solution moving device is a mixed solution reciprocating device that reciprocates and circulates the phosphor mixed solution along the circulation path and the main path. Yes. According to this configuration, since it is sprayed from the spray nozzle after being circulated in the circulation path, the phosphor concentration mixed in the phosphor mixture is less likely to cause unevenness, and the phosphor is uniformly dispersed. A dispersion film can be formed.

  According to the present invention, in the phosphor coating apparatus having the above-described configuration, the stirring means includes a pipe vibration device that vibrates the pipe. According to this configuration, the pipe is vibrated using the pipe vibration device, and the phosphor mixed liquid in the pipe is agitated, so that the mixture liquid that is stirred and the phosphor concentration is uniform is sprayed from the spray nozzle. It is possible to form a phosphor dispersion film in which phosphors are uniformly dispersed.

  Further, the present invention is characterized in that in the phosphor coating apparatus having the above-described configuration, the stirring means has a mixed liquid vibrating device that vibrates the phosphor mixed liquid in the pipe. According to this configuration, the phosphor mixed solution in the pipe is vibrated by virtue of using the mixed solution vibration device, thereby exhibiting the same effect as stirring and reducing the variation in phosphor concentration. Thus, the phosphor can be uniformly dispersed.

  Further, the present invention is characterized in that in the phosphor coating apparatus having the above-described configuration, the stirring means has a pipe swinging device that swings the pipe in any one of up, down, left and right directions. According to this configuration, by shaking the pipe using the pipe rocking device, the same effect as that obtained by stirring can be exhibited, the variation in phosphor concentration can be reduced, and the phosphor can be uniformly dispersed. .

  Further, the present invention is characterized in that, in the phosphor coating apparatus having the above-described configuration, the stirring means has a pipe rotating device for swinging the pipe. According to this configuration, by rotating the pipe using the pipe rotating device, the same effect as that obtained by stirring can be exhibited, and the dispersion of the phosphor concentration can be reduced and uniformly dispersed.

  According to the present invention, in the phosphor coating apparatus configured as described above, the pipe is a tube pipe that can be easily expanded and contracted, and the stirring means includes a pipe expansion / contraction apparatus that expands and contracts the tube pipe in the axial direction. According to this configuration, by expanding and contracting the tube pipe using the pipe expansion / contraction device, the same effect as that obtained by stirring can be exhibited, and the dispersion of the phosphor concentration can be reduced and uniformly distributed.

  Moreover, the present invention is characterized in that, in the phosphor coating apparatus having the above-described configuration, the pipe is a coiled pipe, and the stirring means includes a pipe expansion / contraction device that expands and contracts the coiled pipe in the longitudinal axis direction. According to this configuration, by expanding and contracting the coiled pipe using the pipe expansion / contraction device, the same effect as that obtained by stirring can be exhibited, and the phosphor concentration variation can be reduced and uniformly dispersed.

  According to the present invention, in the phosphor coating apparatus having the above-described configuration, the spray nozzle is provided with a stirring member that stirs the phosphor mixture just before spraying. According to this configuration, after stirring in the pipe, the phosphor concentration can be made more uniform by further stirring with the spray nozzle part.

  The present invention also provides a phosphor coating apparatus comprising a tank for storing a phosphor mixture, a spray nozzle for spraying the phosphor mixture on an object to be coated, and a pipe for feeding the phosphor mixture from the tank to the spray nozzle. A light emitting device manufacturing method for manufacturing a light emitting device having a light emitting device and a wavelength conversion unit including a phosphor that converts a wavelength of light emitted from the light emitting device, wherein the light emitting device emits LED light. A phosphor applying step of applying a phosphor mixed liquid in which a predetermined phosphor is dispersed on the light emitting surface of the LED light emitting element mounted on the LED substrate using the spray nozzle; A firing step of firing the phosphor mixed solution to form a phosphor dispersion film to form the wavelength conversion unit, and the phosphor applying step stirring the phosphor mixed solution in the pipe Stirring through, it is characterized in that the phosphor mixture is stirred and mixed in the piping is piping stirring coating step of coating sprayed from the spray nozzle.

  In the case of the above configuration, the phosphor mixture liquid stored in the tank is stirred in the pipe for feeding the phosphor mixture liquid to the spray nozzle, and the phosphor is uniformly mixed. Therefore, in the mixture liquid sprayed from the spray nozzle The phosphor concentration becomes uniform, and a phosphor mixed solution without density unevenness can be applied even when repeated application operations are performed. Therefore, the light emitting device manufacturing method is capable of continuously manufacturing a light emitting device having a phosphor dispersed film in which phosphors are uniformly dispersed.

  Further, the present invention is a method of manufacturing a light emitting device having the above-described configuration, wherein the stirring means is a circulation movement method for circulating the phosphor mixture liquid in the pipe, a reciprocation movement method for reciprocating the phosphor mixture liquid in the pipe, One of the vibration addition method for vibrating, the pipe expansion / contraction method for expanding and contracting the pipe, or a combination of these is characterized. According to this configuration, the phosphor mixed solution in the pipe can be agitated by circulating the phosphor mixed solution in the pipe, reciprocating or vibrating the phosphor mixed solution in the pipe.

  According to the present invention, the agitation means for agitating the phosphor mixture in the pipe is provided, and the agitated mixture having a uniform phosphor concentration is applied by spraying from the spray nozzle. Therefore, the application operation is repeated. However, a phosphor coating apparatus capable of forming a phosphor dispersion film in which phosphors are always uniformly dispersed can be obtained. Therefore, it is possible to reduce the uneven density of the phosphor and suppress the change in chromaticity. In addition, according to the method for manufacturing a light emitting device according to the present invention, the phosphor coating apparatus includes a stirring / coating step in a pipe for spraying and coating a phosphor mixed liquid that is stirred and mixed in a pipe from a spray nozzle. A light emitting device having a phosphor dispersion film having a uniform phosphor concentration can be manufactured.

It is a schematic explanatory drawing which shows the structure of the fluorescent substance coating device which concerns on this invention. It is sectional drawing which shows schematic structure of the light-emitting device which concerns on this invention. It is a schematic explanatory drawing which shows 1st embodiment of a stirring means. It is a schematic explanatory drawing which shows 2nd embodiment of a stirring means. It is a schematic explanatory drawing which shows 3rd embodiment of a stirring means. It is a schematic explanatory drawing which shows 4th embodiment of a stirring means. It is a schematic explanatory drawing which shows 5th embodiment of a stirring means. It is a schematic explanatory drawing which shows 6th embodiment of a stirring means. It is a schematic explanatory drawing which shows 7th embodiment of a stirring means. It is a schematic explanatory drawing which shows 8th embodiment of a stirring means. It is a schematic explanatory drawing which shows 9th embodiment of a stirring means.

  Embodiments of the present invention will be described below with reference to the drawings. Moreover, the same code | symbol is used about the same structural member, and detailed description is abbreviate | omitted suitably.

  First, the phosphor coating apparatus according to this embodiment will be described with reference to FIG. The phosphor coating apparatus 10 according to this embodiment includes a tank 11 that stores a phosphor mixture 20, a spray nozzle 14 that sprays the phosphor mixture 20 on an object to be coated, and a phosphor mixture 20 that is sprayed from the tank 11. The apparatus includes a pipe 13 that feeds to the nozzle 14 and applies the phosphor mixed solution 20 to the LED light emitting element 3 mounted on the LED substrate 1 using the spray nozzle 14. Further, the applied phosphor mixed solution 20 is baked to generate a wavelength conversion unit, and the phosphor dispersion film 6 (wavelength conversion unit) in which a predetermined phosphor is dispersed is provided on the light emitting surface of the LED light emitting element 3. A light emitting device LD (LED light source; see FIG. 2) is manufactured.

  Further, the tank 11 for storing the phosphor mixed solution 20 is provided with a stirring device 12 for stirring the phosphor mixed solution 20 in the tank, and the stirring is performed for stirring the phosphor mixed solution 20 before spraying to the spray nozzle 14 part. A device 15 is provided.

  These stirring devices have a function of stirring and uniformly mixing the phosphor mixed solution 20 in which a phosphor or inorganic fine particles are mixed in an organic solvent. For example, these stirring devices are disposed in the device via magnetic force or electric force. The configuration is not particularly limited as long as the movable blade-shaped movable piece is driven.

  The phosphor mixed solution 20 uniformly mixed through the stirring device 12 is pressurized and supplied from the tank 11 to the spray nozzle 14 through the pipe 13, receives the wind pressure, and sprays onto the application target from the tip of the spray nozzle. Applied. At this time, an opening that can be freely opened and closed is provided at the tip of the spray nozzle 14, and the opening and closing operation is performed to control the on / off of the spraying operation.

  Even if the stirring device is provided in the tank 11 and the spray nozzle 14, the flow of the phosphor mixed solution 20 in the pipe 13 stops when the phosphor coating operation is not performed. In some cases, the phosphor precipitates, and the phosphor may adhere. Further, when the phosphor is precipitated or adhered in the pipe, even if the phosphor mixed solution 20 is stirred by the spray nozzle 14 part, the application work is intermittently performed in order to continuously produce a large number of light emitting devices. When performing the above, there is a case where density unevenness occurs in the applied phosphor layer in the first half and the second half of the work.

  Therefore, in this embodiment, the stirring means 30 which stirs the phosphor mixed solution 20 in the pipe 13 is provided to suppress the variation in the phosphor concentration in the phosphor mixed solution 20 fed to the spray nozzle 14. Even in the configuration in which the phosphor application operation is repeatedly performed, the phosphor mixture liquid 20 in which the phosphors are uniformly mixed is sprayed and applied.

  That is, the phosphor coating apparatus 10 according to the present embodiment stirs the phosphor mixed solution 20 stored in the tank 11 in the pipe 13 that feeds the spray nozzle 14, and always mixes the phosphor concentrations uniformly. And it is the structure apply | coated to an application | coating target object.

  Therefore, even when the phosphor coating operation is repeatedly performed, the phosphor concentration in the mixture sprayed from the spray nozzle 14 is uniform, and the phosphor mixture 20 without uneven density can be coated, and the uniform concentration. The phosphor coating apparatus 10 capable of forming a phosphor dispersion film is preferable.

  The phosphor mixed solution 20 contains, for example, a phosphor, a layered silicate mineral, and inorganic fine particles in a sol-like mixed solution obtained by mixing an organometallic compound in an organic solvent. The organometallic compound serves as a binder that seals the phosphor, the layered silicate mineral, and the inorganic fine particles. Examples of the organometallic compound used in the present embodiment include metal alkoxides, metal acetylacetonates, metal carboxylates, and the like, and metal alkoxides that are easily gelled by hydrolysis and polymerization reaction are preferable.

  The metal alkoxide may be a single molecule such as tetraethoxysilane, or may be a polysiloxane in which an organic siloxane compound is linked in a chain or a ring, but a polysiloxane that increases the viscosity of the mixed solution is preferable. In addition, there is no restriction | limiting in the kind of metal if a translucent glass body can be formed, but it is preferable to contain a silicon | silicone from a viewpoint of the stability of the glass body formed and the ease of manufacture. Moreover, you may contain multiple types of metal.

  The phosphor is excited by the wavelength (excitation wavelength) of the emitted light from the LED light emitting element 3, and emits fluorescence having a wavelength different from the excitation wavelength. In this embodiment, a YAG (yttrium, aluminum, garnet) phosphor that converts blue light (wavelength 420 nm to 485 nm) emitted from the blue LED element into yellow light (wavelength 550 nm to 650 nm) is used.

  Such phosphors use oxides of Y, Gd, Ce, Sm, Al, La, and Ga, or compounds that easily become oxides at high temperatures, and are mixed well in a stoichiometric ratio. A mixed raw material is obtained. Alternatively, a coprecipitated oxide obtained by calcining a solution obtained by coprecipitation of a solution obtained by dissolving a rare earth element of Y, Gd, Ce, or Sm in an acid with a stoichiometric ratio with oxalic acid, and aluminum oxide or gallium oxide. Mix to obtain a mixed raw material. Then, an appropriate amount of fluoride such as ammonium fluoride is mixed with the obtained mixed raw material as a flux and pressed to obtain a molded body. The obtained molded body is packed in a crucible and fired in air at a temperature range of 1350 to 1450 ° C. for 2 to 5 hours to obtain a sintered body having phosphor emission characteristics. Next, the fired product is ball milled in water, washed, separated and dried, and finally passed through a sieve to obtain a desired phosphor.

  Further, the composition of the obtained phosphor was examined to confirm that it was a desired phosphor, and the emission wavelength in the excitation light of 465 nm was examined. As a result, it was confirmed that the peak wavelength was approximately 570 nm. That is, a phosphor that emits yellow light when irradiated with blue light can be obtained.

  In this embodiment, the YAG phosphor is used. However, the type of the phosphor is not limited to this. For example, other phosphors such as non-garnet phosphors containing no Ce are used. You can also. In addition, the larger the particle size of the phosphor, the higher the light emission efficiency (wavelength conversion efficiency). On the other hand, the gap formed at the interface with the organometallic compound is increased, and the film strength of the formed ceramic layer is lowered. Accordingly, in consideration of the size of the gap generated at the interface between the light emission efficiency and the organometallic compound, it is preferable to use one having an average particle diameter of 1 μm or more and 50 μm or less. The average particle diameter of the phosphor can be measured, for example, by a Coulter counter method.

  The layered silicate mineral is preferably a swellable clay mineral having a structure such as a mica structure, a kaolinite structure, or a smectite structure, and particularly preferably a smectite structure rich in swellability. This is because, as will be described later, by adding water to the mixed liquid, it takes a card house structure in which water enters and swells between the layers of the smectite structure, so the viscosity of the mixed liquid is greatly increased. It is.

  When the content of the layered silicate mineral in the ceramic layer is less than 0.5% by weight, the effect of increasing the viscosity of the mixed solution cannot be obtained sufficiently. On the other hand, when the content of the layered silicate mineral exceeds 20% by weight, the strength of the ceramic layer after heating is lowered. Therefore, the content of the layered silicate mineral is preferably 0.5% by weight or more and 20% by weight or less, and more preferably 0.5% by weight or more and 10% by weight or less.

  In consideration of compatibility with an organic solvent, a layered silicate mineral whose surface is modified (surface treatment) with an ammonium salt or the like can be used as appropriate.

  Inorganic fine particles include a filling effect that fills gaps formed at the interface between the organometallic compound, the phosphor and the layered silicate mineral, a thickening effect that increases the viscosity of the mixed solution before heating, and a ceramic layer film after heating. It has a film strengthening effect that improves strength. Examples of the inorganic fine particles used in the present invention include oxide fine particles such as silicon oxide, titanium oxide and zinc oxide, and fluoride fine particles such as magnesium fluoride. In particular, when a silicon-containing organic compound such as polysiloxane is used as the organometallic compound, it is preferable to use silicon oxide fine particles from the viewpoint of stability with respect to the formed ceramic layer.

  When the content of the inorganic fine particles in the ceramic layer is less than 0.5% by weight, the above-described effects cannot be sufficiently obtained. On the other hand, if the content of the inorganic fine particles exceeds 50% by weight, the strength of the ceramic layer after heating is lowered. Therefore, the content of the inorganic fine particles in the ceramic layer is preferably 0.5 wt% or more and 50 wt% or less, and more preferably 1 wt% or more and 40 wt% or less. The average particle diameter of the inorganic fine particles is preferably 0.001 μm or more and 50 μm or less in consideration of the above-described effects. The average particle diameter of the inorganic fine particles can be measured, for example, by a Coulter counter method.

  In consideration of compatibility with an organic metal compound or an organic solvent, a material obtained by treating the surface of inorganic fine particles with a silane coupling agent or a titanium coupling agent can be used as appropriate.

  A translucent ceramic layer can be obtained by heating a precursor solution obtained by mixing an organometallic compound in an organic solvent. A phosphor dispersion film (wavelength conversion unit) is formed by applying and heating a phosphor mixed solution obtained by mixing phosphor, layered silicate mineral, and inorganic fine particles to the precursor solution. Furthermore, by adding water to the mixed solution, water enters between the layers of the layered silicate mineral and the viscosity of the mixed solution increases, so that the phosphor can be prevented from settling. In addition, since there exists a possibility of inhibiting a polymerization reaction when the impurity is contained in water, it is necessary to use the pure water which does not contain an impurity for the water to add.

  As the organic solvent, alcohols such as methanol, ethanol, propanol and butanol having excellent compatibility with added water are preferable. Further, when the amount of the organometallic compound mixed with the organic solvent is less than 5% by weight, it becomes difficult to increase the viscosity of the mixed solution, and when the amount of the organometallic compound exceeds 50% by weight, the polymerization reaction is faster than necessary. Proceed. Therefore, the amount of the organometallic compound mixed with the organic solvent is preferably 5% by weight or more and 50% by weight or less, and more preferably 8% by weight or more and 40% by weight or less.

  For example, when using a surface-treated lipophilic layered silicate mineral, the layered silicate mineral is first added to a solution (precursor solution) in which an organometallic compound is mixed in an organic solvent. Premixing is performed, and then phosphor, inorganic fine particles, and water are mixed. When a hydrophilic layered silicate mineral that has not been surface-treated is used, first the layered silicate mineral and water are premixed, and then the phosphor, inorganic fine particles, and precursor solution are mixed. Thereby, a layered silicate mineral can be mixed uniformly and the thickening effect can be heightened more. The preferred viscosity of the mixed solution is 25 to 800 cP, and the most preferred viscosity is 30 to 500 cP.

  Further, when the ratio of water to the total amount of the solvent obtained by adding water to the organic solvent is less than 5% by weight, the above thickening effect cannot be sufficiently obtained, and when the ratio of water exceeds 60% by weight, the thickening effect is obtained. The effect of reducing the viscosity due to excessive mixing of water is greater than that. Therefore, the ratio of water is preferably 5% by weight or more and 60% by weight or less, and more preferably 7% by weight or more and 55% by weight or less with respect to the total amount of solvent.

  The most preferable composition of the mixed liquid is one using polysiloxane as the organometallic compound, and the most preferable composition range of each of the above components contained in the mixed liquid is that the polysiloxane dispersion is 4 to 30% by weight, and the layered silica is used. The acid salt mineral is 1 to 10% by weight, the inorganic fine particles are 1 to 40% by weight, and the water is 10 to 50% by weight.

  A predetermined amount of the phosphor mixture 20 obtained as described above is applied to the LED light emitting element 3, and heated and baked to form a phosphor dispersion film 6 (wavelength conversion portion) having a predetermined thickness. When the heating temperature is less than 100 ° C., the polymerization reaction of the organometallic compound does not proceed. When the heating temperature exceeds 1000 ° C., the layered silicate mineral is thermally decomposed and the layered structure is destroyed. Therefore, the heating temperature of the mixed liquid needs to be 100 ° C. or higher and 1000 ° C. or lower, and is preferably 250 ° C. to 600 ° C.

  Further, when the thickness of the formed phosphor dispersion film 6 (wavelength conversion portion) is less than 5 μm, the wavelength conversion efficiency is lowered and sufficient fluorescence cannot be obtained, and the thickness of the phosphor dispersion film 6 exceeds 500 μm. In such a case, the film strength is lowered and cracks and the like are likely to occur. Therefore, the thickness of the phosphor dispersion film 6 is preferably 5 μm or more and 500 μm or less.

  The light-emitting device LD (LED light source) manufactured as described above will be described with reference to FIG.

  As shown in FIG. 2, in the light emitting device LD, a metal part 2 is provided on an LED substrate 1 having a flat plate shape or a concave cross section, and an LED light emitting element 3 is arranged on the metal part 2. The LED light emitting element 3 is provided with a protruding electrode 4 on the surface facing the metal part 2, and the metal part 2 and the LED light emitting element 3 are connected via the protruding electrode 4 (flip chip type). In addition, the structure which provides one LED light emitting element 3 with respect to one LED board 1, or the structure which provides several LED light emitting element 3 with respect to one LED board may be sufficient.

  In the present embodiment, a light emitting device LD in which a blue LED element is mounted as the LED light emitting element 3 is manufactured using the LED substrate 1 having a concave cross section. The blue LED element is formed, for example, by laminating an n-GaN-based cladding layer, an InGaN light-emitting layer, a p-GaN-based cladding layer, and a transparent electrode on a sapphire substrate.

  In addition, a phosphor dispersion film 6 (wavelength conversion unit) is formed in the concave portion of the LED substrate 1 so as to seal the periphery of the LED light emitting element 3. The phosphor dispersion film 6 (wavelength conversion unit) is a part that converts light having a predetermined wavelength emitted from the LED light emitting element 3 into light having a different wavelength, and the LED light emitting element 3 is included in the translucent ceramic layer. A predetermined phosphor that is excited by the wavelength of the light and emits fluorescence having a wavelength different from the excitation wavelength is added.

  The phosphor dispersion film 6 (wavelength conversion unit) may be provided at least around the LED light emitting element 3 (upper surface and side surface), and may not be provided in the other concave portion of the LED substrate 1. In addition, as a method of providing the phosphor dispersion film 6 (wavelength conversion unit) only around the LED light emitting element 3, a method of masking other than the periphery of the LED light emitting element 3 can be used.

  The phosphor coating apparatus 10 of the present embodiment shown in FIG. 1 is a phosphor mixture solution in the pipe 13 in order to reduce the uneven density of the phosphor in the phosphor dispersion film 6 and suppress the variation in emission chromaticity. Stirring means 30 for stirring 20 is provided.

  Various types of apparatuses can be used as the stirring means 30 for stirring the phosphor mixed liquid 20 in the pipe 13. For example, the phosphor mixed solution 20 in the pipe 13 can be moved, circulated, vibrated, or the like by using a circulation device, a reciprocating device, a vibration device, a vibration device, or the like. The actually applied stirring means 30 will be described with reference to FIGS.

  A phosphor coating apparatus 10 </ b> A shown in FIG. 3 is a first embodiment example using a circulation pump 31 as the stirring means 30. In addition, a circulation path 16 is provided in the pipe 13 and is connected via joint portions 17 and 18. For that purpose, the portion between the joint portion 17 and the joint portion 18 of the pipe 13 becomes the main route 13A, and the phosphor mixed solution 20 in the circulation route 16 is passed through the circulation pump 31, for example, the circulation route 16, the joint. The part 17, the main path 13 </ b> A, the joint part 18, and the circulation path 16 circulate and move in the direction indicated by the arrows in the drawing.

  At this time, the joint portion 17 may be provided near the tank 11 or directly on the tank 11, and the joint portion 18 may be provided near the spray nozzle 14 or directly on the spray nozzle body. In any case, it is preferable to provide the respective joint portions 17 and 18 at sites where variations in the phosphor concentration in the phosphor mixture 20 fed to the spray nozzle 14 are unlikely to occur.

  In such a configuration, since the spray nozzle 14 sprays after circulating in the circulation path, the phosphor mixed in the phosphor mixture 20 does not cause precipitation or adhesion of the phosphor in the pipe. It is preferable that the phosphor coating apparatus 10A has a configuration in which unevenness in density is unlikely to occur and can form a phosphor dispersion film in which phosphors are uniformly dispersed.

  If the phosphor dispersion film in which the phosphor is uniformly dispersed is formed to a predetermined thickness, the third light in which the primary light emitted from the light emitting element and the secondary light emitted from the phosphor are uniformly mixed is used. It emits light, can suppress the change in emission chromaticity, and can manufacture a high-quality light-emitting device (LED light source). That is, by using the phosphor coating apparatus 10A of the present embodiment, a high-quality light-emitting device LD having a phosphor-dispersed film in which phosphors are uniformly dispersed can be obtained even when a large number of light-emitting devices of the same lot are manufactured. Manufacturable.

  Further, if the phosphor mixed solution 20 in the tank 11 can be stirred through the circulation pump 31, it is not necessary to use the stirring device 12 provided in the tank 11, and it can be reduced. Similarly, if the phosphor mixed liquid 20 in the spray nozzle part can be stirred through the circulation pump 31, it is not necessary to use the stirring device 15 provided in the spray nozzle part, and the reduction can be achieved.

  A phosphor coating apparatus 10 </ b> B shown in FIG. 4 is a second embodiment example using a mixed liquid moving apparatus 32 as the stirring means 30. Further, a circulation path 16 is provided in the pipe 13 via joint portions 17 and 18. For example, the mixed liquid moving device 32 movably accommodates a cylinder member 32a made of a magnetic material in a circulation path, and reciprocates the cylinder member 32a via a magnet driver 32b of a uniaxial actuator installed outside. It is supposed to be configured.

  As described above, the phosphor mixture liquid 20 in the piping can also be agitated by reciprocating the cylinder member 32a in the circulation path 16, thereby suppressing variation in the phosphor concentration.

  The shape of the cylinder member 32a is not particularly limited as long as it is a shape that can be slid and moved in the circulation path 16 by receiving a driving force by the reciprocating magnet driver 32b and the phosphor mixture 20 can be stirred. .

  Thus, even in the mixed liquid moving device 32 having the configuration including the cylinder member 32a and the magnet driver 32b, the phosphor mixed liquid 20 in the circulation path 16 and the main path 13A can be stirred. Therefore, since the phosphor mixture liquid 20 is stirred and then sprayed from the spray nozzle 14, the phosphor concentration mixed in the phosphor mixture liquid is less likely to cause unevenness, and the phosphor is uniformly dispersed. A dispersion film can be formed, which is preferable.

  A phosphor coating apparatus 10 </ b> C shown in FIG. 5 is a third embodiment example using a rotating propeller 33 as a circulation device as the stirring means 30. Further, a circulation path 16 is provided through joint portions 17 and 18 provided in the pipe 13. For example, the rotary propeller 33 may be configured to drive a propeller-like movable piece disposed in the apparatus via magnetic force or electric force, and the configuration is not particularly limited.

  As described above, even in the circulation device having the configuration including the rotary propeller 33, the phosphor mixed solution 20 in the circulation path 16 and the main path 13A can be stirred. Therefore, since the phosphor mixture liquid 20 is stirred and then sprayed from the spray nozzle 14, the phosphor concentration mixed in the phosphor mixture liquid 20 is less likely to be uneven, and the phosphor is uniformly dispersed. A body dispersion film can be formed, which is preferable.

  A phosphor coating apparatus 10 </ b> D shown in FIG. 6 is a fourth embodiment example using a pipe vibration device 34 that vibrates a pipe as the stirring means 30. Alternatively, joints 17 and 18 may be provided in the pipe 13 and the main path 13A therebetween may be used as a vibration region. If it is this structure, by using the piping member which is easy to add vibration by the piping vibration apparatus 34 to install, piping will be vibrated effectively and the fluorescent substance liquid mixture 20 will be vibrated and mixed, ie, favorable Can be stirred.

  As described above, since the pipe vibration device 34 also functions as the stirring means 30, the phosphor coating device 10D including the pipe vibration device 34 can also stir the phosphor mixed solution 20 in the pipe. Therefore, since the phosphor mixture liquid 20 is stirred and then sprayed from the spray nozzle 14, the phosphor concentration mixed in the phosphor mixture liquid 20 is less likely to be uneven, and the phosphor is uniformly dispersed. A body dispersion film can be formed, which is preferable.

  A phosphor coating apparatus 10E shown in FIG. 7 is a fifth embodiment example using a mixed liquid vibration apparatus 35 that vibrates the phosphor mixed liquid 20 in the pipe as the stirring means 30. Moreover, it is good also as a structure which provides the joint parts 17 and 18 in the piping 13, and vibrates the fluorescent substance liquid mixture 20A in the main path | route 13A in the meantime. As the mixed liquid vibration device 35, for example, an ultrasonic vibration device having an effect of vibrating a phosphor having a predetermined particle diameter to be blended can be used.

  When an ultrasonic vibration device is used, the main path 13A is immersed in a solution that can easily transmit ultrasonic waves, and the main path 13A and the mixed liquid vibration device 35 are integrally immersed so that the ultrasonic wave is used. It is good also as a structure which improves a vibration effect.

  If it is an above-described structure, the phosphor mixed solution 20A in the pipe is vibrated by vibration using the mixed solution vibrating device 35, and the same effect as the stirring is exhibited, Variations can be reduced and phosphors can be uniformly dispersed.

  That is, since the mixed liquid vibrating device 35 also functions as the stirring means 30, the phosphor coating device 10E provided with the mixed liquid vibrating device 35 can also stir the phosphor mixed liquid 20 in the pipe. Therefore, since the phosphor mixture liquid 20 is stirred and then sprayed from the spray nozzle 14, the phosphor concentration mixed in the phosphor mixture liquid 20 is less likely to be uneven, and the phosphor is uniformly dispersed. A body dispersion film can be formed, which is preferable.

  A phosphor coating apparatus 10F shown in FIG. 8 is a sixth embodiment example using a pipe swinging device 36 that swings a pipe in any one of up, down, left and right directions as the stirring means 30. Further, the joint portion 17A is moved up and down by the pipe swinging device 36 as shown in the drawing, for example, so that the main path 13A portion between the joint portion 17A and the joint portion 18 is shaken and waved. Yes. As this piping rocking | fluctuation apparatus 36, the uniaxial actuator which reciprocates the joint part 17A to a predetermined direction can be used, for example.

  With the configuration described above, by shaking the pipe using the pipe oscillating device 36, the same effect as that obtained by stirring is exhibited, the variation in the phosphor concentration is reduced, and the phosphor is uniformly dispersed. be able to.

  That is, since the pipe rocking device 36 also functions as the stirring means 30, the phosphor coating device 10F provided with the pipe rocking device 36 can also stir the phosphor mixed solution 20 in the pipe. Therefore, since the phosphor mixture liquid 20 is stirred and then sprayed from the spray nozzle 14, the phosphor concentration mixed in the phosphor mixture liquid 20 is less likely to be uneven, and the phosphor is uniformly dispersed. A body dispersion film can be formed, which is preferable.

  A phosphor coating apparatus 10G shown in FIG. 9 is a seventh embodiment example using a pipe rotating device 37 that swings a pipe as the stirring means 30. In this case, as the joint portion provided in the pipe, the rotary joint portions 17B and 18A that rotatably support the pipe are used, and one joint portion, for example, the joint portion 17B is swung around with a predetermined radius by the pipe rotation device 37. And That is, as the pipe rotation device 37, a rotation drive member having a function of swinging the joint portion 17B with a predetermined radius, for example, a rotary actuator can be used.

  With the configuration described above, by rotating the pipe using the pipe rotating device 37, the same effect as that obtained by stirring can be exhibited, and the dispersion of the phosphor concentration can be reduced and uniformly dispersed.

  That is, since the pipe rotating device 37 also functions as the stirring means 30, the phosphor coating device 10G provided with the pipe rotating device 37 can also stir the phosphor mixed solution 20 in the pipe. Therefore, since the phosphor mixture liquid 20 is stirred and then sprayed from the spray nozzle 14, the phosphor concentration mixed in the phosphor mixture liquid 20 is less likely to be uneven, and the phosphor is uniformly dispersed. A body dispersion film can be formed, which is preferable.

  A phosphor coating apparatus 10H shown in FIG. 10 is an eighth embodiment using a pipe expansion / contraction apparatus 38 that expands and contracts a pipe in the axial direction as the stirring means 30. In this case, since the pipe is preferably a tube pipe that can be easily expanded and contracted, for example, the main path 13B made of an easily expandable tube is provided between the joint parts 17 and 18, and one joint part, for example, the joint part 17 is piped. The telescopic device 38 is configured to reciprocate in the axial direction and expand and contract. In other words, as the pipe expansion / contraction device 38, a driving member having a function of expanding and contracting the main path 13B made of tube piping by reciprocating between the moving end 38A, for example, a uniaxial actuator can be used.

  If it is an above-mentioned structure, the same effect as having stirred can be exhibited by expanding and contracting tube piping using piping expansion-contraction apparatus 38, and the dispersion | variation in fluorescent substance concentration can be reduced and disperse | distributed uniformly. .

  That is, since the pipe expansion / contraction device 38 also functions as the stirring means 30, the phosphor coating device 10H provided with the pipe expansion / contraction device 38 can also stir the phosphor mixed solution 20 in the pipe. For this reason, since the phosphor mixture liquid 20 is stirred and then sprayed from the spray nozzle, the concentration of the phosphor blended in the phosphor mixture liquid 20 is less likely to be uneven, and the phosphor is uniformly dispersed. A dispersion film can be formed, which is preferable.

  A phosphor coating apparatus 10K shown in FIG. 11 is a ninth embodiment using a pipe expansion / contraction apparatus 38 that expands and contracts a pipe in the axial direction as the stirring means 30 as in the phosphor coating apparatus 10H. The difference is that the pipe part to be made is a coiled pipe 13C. That is, in the ninth embodiment, a coiled pipe 13C is provided in the main path between the joint parts 17 and 18, and one joint part, for example, the joint part 17 is reciprocated in the axial direction by the pipe expansion / contraction device 38. To expand and contract. That is, the pipe expansion / contraction device 38 is, for example, the uniaxial actuator described above, and has a function of reciprocating between the moving end 38A and expanding / contracting the coiled pipe 13C.

  If it is an above-mentioned structure, the same effect as having stirred the fluorescent substance liquid mixture in piping will be exhibited by extending and contracting coiled piping 13C in the longitudinal direction using piping expansion-contraction apparatus 38, and phosphor concentration Can be dispersed uniformly.

  That is, since the structure which expands and contracts the coiled pipe 13C using the pipe expansion / contraction device 38 also functions as the stirring means 30, the phosphor coating apparatus 10K can also stir the phosphor mixed solution 20 in the pipe. For this reason, since the phosphor mixture liquid 20 is stirred and then sprayed from the spray nozzle, the concentration of the phosphor blended in the phosphor mixture liquid 20 is less likely to be uneven, and the phosphor is uniformly dispersed. A dispersion film can be formed, which is preferable.

  As explained in the first to ninth embodiments, the phosphor coating apparatus 10 (10A to 10K) of the present embodiment is provided with the stirring means 30 for stirring the phosphor mixed solution in the pipe. The mixed liquid having a uniform phosphor concentration is sprayed from a spray nozzle and applied. Therefore, according to the phosphor coating apparatus according to the present embodiment, it is possible to form a phosphor dispersion film in which phosphors are uniformly dispersed.

<Experimental example>
Next, the results of experiments actually performed will be described. In this experiment, a blue LED element is used as a light emitting element, and a YAG phosphor that converts blue light into yellow light (wavelength 550 nm to 650 nm) is formed on the light emitting surface. The first experiment using the circulation pump 31 described in the first embodiment, the second experiment using the cylinder member described in the second embodiment, and the third experiment using the rotary propeller 33 described in the third embodiment. The experiment, the fourth experiment using the ultrasonic vibration device described in the fifth embodiment, the fifth experiment using the pipe oscillating device described in the sixth embodiment, and producing a plurality of light emitting devices in each, The degree of change in emission chromaticity was confirmed. Further, as a comparative example, a plurality of light emitting devices having a phosphor dispersion film formed by a conventional method in which the phosphor mixed solution is not stirred in a pipe were manufactured, and the degree of change in the emission chromaticity was confirmed. The experimental results are shown in Table 1.

  As shown in Table 1, using a light emitting device that emits white light by forming a yellow phosphor dispersion film on a blue LED element, the degree of change in the hue (light emission chromaticity) was visually confirmed. In the comparative example (conventional example) without stirring, it was clarified that the hue was certainly not uniform. However, according to the present embodiment that stirs in the pipe, it is confirmed that the change in chromaticity is smaller than that of the comparative example in any method, in particular, the example using the circulation pump in the first experiment, In the example using the propeller in the three experiments and the example using the ultrasonic vibration device in the fourth experiment, no change in chromaticity was observed in the plurality of light emitting devices.

  Next, a method for manufacturing the light emitting device according to this embodiment will be described.

  The manufacturing method of the light-emitting device according to the present embodiment includes a tank that stores a phosphor mixture, a spray nozzle that sprays the phosphor mixture on an application target, and a pipe that feeds the phosphor mixture from the tank to the spray nozzle. And a wavelength conversion unit including a phosphor that converts the wavelength of light emitted from the light emitting element. In addition, the light emitting element is an LED light emitting element, and a phosphor application step of applying a phosphor mixed liquid in which a predetermined phosphor is dispersed to the light emitting surface of the LED light emitting element mounted on the LED substrate using a spray nozzle. And a firing step of firing the applied phosphor mixed solution to form a phosphor dispersion film to form a wavelength conversion section.

  Further, in the present embodiment, the phosphor coating step is performed by stirring the phosphor mixed solution in the pipe through a stirring means, and spraying the phosphor mixed liquid stirred and mixed in the pipe from the spray nozzle. It is a stirring application process in the piping.

  In the case of the above configuration, the phosphor mixture liquid stored in the tank is stirred in the pipe for feeding the phosphor mixture liquid to the spray nozzle, and the phosphor is uniformly mixed. Therefore, in the mixture liquid sprayed from the spray nozzle The phosphor concentration becomes uniform, and the phosphor mixture without concentration unevenness can be repeatedly applied even when repeated application operations are performed. Therefore, it is preferable as a method for manufacturing a light emitting device capable of continuously manufacturing a light emitting device having a phosphor dispersed film in which phosphors are uniformly dispersed.

  Moreover, the various stirring means mentioned above can be used as a stirring means which stirs the fluorescent substance liquid mixture in piping. That is, among the circulation movement method that circulates the phosphor mixture liquid in the pipe, the reciprocation movement method that reciprocates the phosphor mixture liquid in the pipe, the vibration addition method that vibrates, the pipe expansion method that expands and contracts the pipe, etc. Any of these methods or a combination of these methods can be used. With such a configuration, the phosphor mixture liquid is circulated in the pipe, the phosphor mixture liquid is reciprocated in the pipe, or is vibrated to stir the phosphor mixture liquid in the pipe. Can do.

  For this reason, the phosphor concentration does not vary and the phosphor mixed solution in a uniformly mixed state is sprayed, so that a coating film having a predetermined thickness in which the phosphors are uniformly dispersed can be formed. That is, the method for manufacturing a light emitting device according to this embodiment includes a phosphor dispersion film that generates uniform secondary light corresponding to a light emitting surface that emits primary light of a predetermined wavelength even when repeated coating operations are performed. The manufacturing method can be formed.

  As described above, according to the phosphor coating apparatus according to the present invention, the agitation means for agitating the phosphor mixture in the pipe is provided, and the agitated mixture having a uniform phosphor concentration is sprayed from the spray nozzle. Therefore, a phosphor coating apparatus capable of forming a phosphor dispersion film in which phosphors are uniformly dispersed can be obtained even when repeated coating operations are performed.

  Moreover, according to the manufacturing method of the light-emitting device based on this invention using this fluorescent substance coating device, the light-emitting device (LED light source) which has the fluorescent substance dispersion film | membrane of uniform fluorescent substance density | concentration can be manufactured continuously.

  The phosphor coating device and the light emitting device manufacturing method according to the present invention include a light emitting device (LED that emits third light of a desired color by mixing primary light emitted from an LED light emitting element and secondary light emitted from a phosphor. The phosphor coating device and the light emitting device can be suitably applied to a light source.

DESCRIPTION OF SYMBOLS 1 LED board 3 LED light emitting element 6 Phosphor dispersion film (wavelength conversion part)
DESCRIPTION OF SYMBOLS 10 Phosphor coating apparatus 11 Tank 12 Stirring apparatus 13 Piping 13A Main path 14 Spray nozzle 16 Circulating path 20 Phosphor mixed liquid 30 Stirring means 31 Circulating pump 32 Mixed liquid moving apparatus 33 Rotating propeller 34 Piping vibration apparatus 35 Mixed liquid vibration apparatus 36 Piping Oscillator 37 Piping Rotating Device 38 Piping Expansion Device LD Light Emitting Device (LED Light Source)

Claims (13)

A tank for storing the phosphor mixture, a spray nozzle for spraying the phosphor mixture on the object to be coated, and a pipe for feeding the phosphor mixture from the tank to the spray nozzle. A phosphor coating apparatus used to form a wavelength conversion unit including a phosphor that coats a body mixture and converts the wavelength of light emitted from the light emitting element,
The light-emitting element is an LED light-emitting element, and the phosphor mixed liquid in which a predetermined phosphor is dispersed is sprayed from the spray nozzle on the light-emitting surface of the LED light-emitting element mounted on the LED substrate. A phosphor coating apparatus comprising a stirring means for stirring the phosphor mixture in the pipe.   The said piping has a main path | route and a circulation path, The said stirring means has a liquid mixture moving apparatus which moves a fluorescent substance liquid mixture along the said circulation path | route and the said main path | route. Phosphor coating device.   3. The phosphor coating apparatus according to claim 2, wherein the liquid mixture moving device is a liquid mixture circulation device that circulates the phosphor liquid mixture along the circulation path and the main path.   3. The phosphor coating apparatus according to claim 2, wherein the mixed liquid moving device is a mixed liquid reciprocating device that reciprocates and circulates the phosphor mixed solution along the circulation path and the main path.   The phosphor coating apparatus according to claim 1, wherein the stirring unit includes a pipe vibration device that vibrates the pipe.   2. The phosphor coating apparatus according to claim 1, wherein the agitation unit includes a mixed liquid vibrating device that vibrates the phosphor mixed liquid in the pipe. 3.   2. The phosphor coating apparatus according to claim 1, wherein the agitation unit includes a pipe rocking device that rocks the pipe in any one direction of up, down, left, and right.   The phosphor coating apparatus according to claim 1, wherein the stirring unit includes a pipe rotating device that swings the pipe.   The phosphor coating apparatus according to claim 1, wherein the pipe is a tube pipe that can be easily expanded and contracted, and the agitation unit includes a pipe expansion / contraction device that expands and contracts the tube pipe in an axial direction.   The phosphor coating apparatus according to claim 1, wherein the pipe is a coiled pipe, and the stirring unit includes a pipe expansion / contraction device that expands and contracts the coiled pipe in a longitudinal axis direction thereof.   The phosphor coating apparatus according to any one of claims 1 to 10, wherein the spray nozzle is provided with a stirring member that stirs the phosphor mixture just before spraying. Light emission using a phosphor coating device comprising a tank for storing a phosphor mixture, a spray nozzle for spraying the phosphor mixture on an object to be coated, and a pipe for feeding the phosphor mixture from the tank to the spray nozzle A light emitting device manufacturing method for manufacturing a light emitting device having an element and a wavelength conversion unit including a phosphor that converts a wavelength of light emitted from the light emitting element,
The light-emitting element is an LED light-emitting element, and a phosphor coating that applies a phosphor mixture in which a predetermined phosphor is dispersed to the light-emitting surface of the LED light-emitting element mounted on the LED substrate using the spray nozzle. And a step of firing the applied phosphor mixed solution to form a phosphor dispersion film to form the wavelength conversion unit, and the phosphor coating step includes mixing phosphors in the pipe A method of manufacturing a light emitting device, comprising: a stirring / coating step in a pipe in which the phosphor mixed liquid stirred and mixed in a pipe is sprayed from the spray nozzle and applied through a stirring means for stirring the liquid. .   The stirring means includes a circulation movement method for circulating the phosphor mixture liquid in the pipe, a reciprocation movement method for reciprocating the phosphor mixture liquid in the pipe, a vibration addition system for vibrating, and a pipe expansion / contraction system for expanding and contracting the pipe. The method for manufacturing a light-emitting device according to claim 12, wherein any one of the above or a combination thereof is used.

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