JP5380027B2 - Method for manufacturing light emitting device - Google Patents

Description

 The present invention relates to a method and an apparatus for manufacturing a light-emitting device including a light-emitting element and a fluorescent material that emits light by absorbing at least a part of light emitted from the light-emitting element.

Conventionally, as a light-emitting device, a light-emitting diode (LED) that emits light with a short wavelength such as blue, and a fluorescence that excites and absorbs at least part of the light emitted from the light-emitting diode to emit longer-wavelength fluorescence. White light emitting diodes using materials are known.
As such a white light emitting diode, for example, a blue light emitting diode element made of a compound semiconductor, and yttrium, aluminum, and garnet activated by absorbing cerium that emits blue fluorescence that is excited by absorbing blue light. A white light emitting diode including a phosphor is disclosed (for example, see Patent Document 1).

  A white light emitting diode can also be realized by using an alpha sialon phosphor instead of the yttrium / aluminum / garnet phosphor activated by cerium. As such an alpha sialon phosphor, for example, a calcium solid solution alpha sialon phosphor activated by europium (Eu) is disclosed (for example, see Patent Document 2).

  By the way, in order for a light emitting device that expresses a color by mixing light emitted from a light emitting diode and light emitted from a fluorescent material to emit light of a desired color, the light emitted from the light emitting diode. The balance between the amount of light and the amount of light emitted from the fluorescent material is very important. Therefore, it is necessary to emit light in a well-balanced manner and mix them. In such a light-emitting device, in order to place and fix the fluorescent substance on or near the light-emitting diode, light from the light-emitting diode and light from the fluorescent substance can be emitted and various resins can be emitted. It is necessary to include a fluorescent substance in the sealing material for sealing the light emitting diode.

Thus, in a light emitting device having a configuration in which a fluorescent material is included in a sealing material, the amount of light emitted from the light emitting diode and the amount of light emitted from the fluorescent material are greatly affected by the content and distribution of the fluorescent material. Therefore, it is necessary to control the content and distribution of the fluorescent substance with extremely high accuracy.
In order to improve such problems, the sealing material containing the fluorescent material is agitated while keeping the temperature constant so that the density of the fluorescent material in the sealing material becomes substantially constant. A method for forming a light emitting device and a forming apparatus for applying a predetermined amount of a mixture of a substance and a sealing material onto a light emitting diode chip while maintaining the density thereof are disclosed (for example, see Patent Document 3).
Japanese Patent No. 2927279 JP 2002-363554 A JP-A-10-233533

 However, when a light-emitting device is manufactured using the method and apparatus for forming a light-emitting device disclosed in Patent Document 3, the chromaticity of the obtained white light-emitting diode gradually changes to the blue side. There was a problem that the change of the sudden. Although such a phenomenon depends on the speed of manufacturing the light emitting device, it has been remarkably confirmed particularly when a large number of light emitting devices exceeding 500 are manufactured continuously.

 The present invention has been made in view of the above circumstances, and provides a method and an apparatus for manufacturing a light emitting device with a high yield even when a large number of light emitting devices exceeding 500 are continuously manufactured. Objective.

 The present invention provides a light-emitting element mounted on a package, and the light-emitting element includes a fluorescent material that emits light by absorbing at least a part of light emitted from the light-emitting element, and seals the light-emitting element The light-emitting device is manufactured by applying the sealing material to the light-emitting element while stirring the cooling material while cooling, thereby suppressing the increase in viscosity. A method of manufacturing a light emitting device is provided in which the package on which the light emitting element is mounted is heated to a temperature at which the package is cured immediately after the sealing material is applied to the light emitting element before the sealing material is applied to the light emitting element.

 In the stirring step, the sealing material is preferably cooled to 5 ° C. or lower.

 In the stirring step, it is preferable that the sealing material containing the fluorescent substance is stirred by a rotating stirring member, and the rotation speed of the stirring member is 0.1 rotation / second or more and 5 rotation / second or less.

 In the heating step, the package on which the light emitting element is mounted is preferably heated to a temperature higher than a temperature at which the sealing material starts to be cured.

The present invention provides a light-emitting element mounted on a package, and the light-emitting element includes a fluorescent material that emits light by absorbing at least a part of light emitted from the light-emitting element, and seals the light-emitting element A light-emitting device manufacturing apparatus for manufacturing a light-emitting device by coating a coating means for applying the sealing material to the light-emitting element mounted on the package, and stirring the sealing material in the coating means An agitation unit provided with an agitation member, a cooling unit disposed around the application unit and cooling the sealing material in the application unit, and the package on which the light emitting element is mounted. A heating unit that heats to a temperature that cures immediately after being applied to the light emitting element, and the heating unit includes a heating unit provided with a plurality of housing units for housing the package on which the light emitting element is mounted, The yield Providing an apparatus for manufacturing a light emitting device having a fixture for fixing the package mounted with the light emitting element housed in the section.
The cooling means is preferably arranged so as to surround the distal end surface and the outer peripheral surface of the syringe, except for the nozzle connected to the distal end portion of the syringe, with the syringe constituting the application means as a center.

 A method of manufacturing a light emitting device according to the present invention includes mounting a light emitting element on a package, the light emitting element including a fluorescent material that emits light by absorbing at least a part of light emitted from the light emitting element, A method of manufacturing a light emitting device by applying a sealing material to be sealed, wherein the sealing material is agitated while cooling the sealing material, and the sealing material is applied to the light emitting element while suppressing an increase in viscosity. Before applying the sealing material to the light emitting element, the package on which the light emitting element is mounted is heated to a temperature at which the package is cured immediately after the sealing material is applied to the light emitting element. Even when a large number of light emitting devices exceeding the above are continuously manufactured, variation in chromaticity can be greatly reduced, and light emitting devices having a constant chromaticity can be stably manufactured with a high yield.

 The light emitting device manufacturing apparatus of the present invention includes a light emitting element mounted on a package, the light emitting element including a fluorescent material that emits light by absorbing at least a part of light emitted from the light emitting element, and the light emitting element includes: An apparatus for manufacturing a light-emitting device that manufactures a light-emitting device by applying a sealing material to be sealed, the application unit applying the sealing material to the light-emitting element mounted on the package, and in the application unit An agitation unit provided with an agitation member for agitating the encapsulant, a cooling unit arranged around the application unit and cooling the encapsulant in the application unit, and the package mounted with the light emitting element The heating means is heated to a temperature at which the sealing material is cured immediately after it is applied to the light emitting element. Degree of rose Can greatly reduce, it can be produced stably at a high yield a light-emitting device having a certain chromaticity.

 Hereinafter, the present invention will be described in detail.

(Light emitting device manufacturing equipment)
FIG. 1 shows an embodiment of a light emitting device manufacturing apparatus according to the present invention, and is a schematic configuration diagram partially showing a cross section.
In FIG. 1, reference numeral 10 is a light emitting device manufacturing apparatus, 11 is a coating means, 12 is a stirring means, 13 is a cooling means, 14 is a heating means, 15 is a syringe, 16 is a nozzle, 17 is a stirring member, and 18 is a rotating shaft. 19 is a blade, 20 is a drive unit, 21 is a heating unit, 22 is a fixing jig, 23 is a storage unit, 24 is a gas introduction pipe, 25 is a gas introduction path, 26 is a cable, 30 is a light emitting device, and 31 is a light emitting element. , 32 is a package, 33 is a sealing material, 34 is a circuit pattern, 36 is a gold wire, 37 is a reflective surface, 38 is a recess, 39 is a package, and 40 is a package frame.
The light emitting device manufacturing apparatus 10 of this embodiment includes a light emitting element 31, a package 32 on which the light emitting element 31 is mounted, and a fluorescent material that emits light by absorbing at least part of the light emitted from the light emitting element 31, The light emitting device 30 is provided with a sealing material 33 that seals the light emitting element 31.

 The light emitting device manufacturing apparatus 10 according to this embodiment includes a coating unit 11 that coats a sealing material 33 containing a fluorescent substance on a light emitting element 31 mounted on a package 32, and a coating unit 11 in the coating unit 11. The agitating means 12 provided with the agitating member 17 for agitating the sealing material 33, the cooling means 13 arranged around the applying means 11 and cooling the sealing material 33 in the applying means 11, and the light emitting element 31. A heating unit 14 for heating the mounted package 32 is schematically configured.

The application unit 11 is roughly configured by a substantially cylindrical syringe 15 and a nozzle 16 that is connected to the distal end portion 15 a of the syringe 15 and discharges the sealing material 33 in the syringe 15.
As the sealing material 33, a thermosetting transparent resin is used.

The agitating means 12 is connected to the agitating member 17 comprising a columnar rotating shaft 18 and blades 19 provided on the outer peripheral surface thereof, and is connected to the rotating shaft 18 so as to rotate the agitating member 17 about the rotating shaft 18. The driving unit 20 is provided with a driving motor 20 and the like.
The rotating shaft 18 forms the central axis of the stirring member 17, and the rotating shaft 18 is disposed at the center of the syringe 15. Further, the length of the rotating shaft 18 is substantially equal to the entire length in the longitudinal direction inside the syringe 15. Further, the blade 19 provided on the outer peripheral surface of the rotary shaft 18 includes three blades 19A, 19B, and 19C having the rotational shaft 18 as a symmetric axis, and these blades 19A, 19B, and 19C are in different directions. It is arranged. And the blade | wing 19 is distribute | arranged over the full length of the area | region in which the sealing material 33 is accommodated in the longitudinal direction inside the syringe 15. FIG.
With such a structure of the stirring member 17, the sealing material 33 containing the fluorescent substance contained in the syringe 15 can be stirred so that the concentration of the fluorescent substance becomes uniform.

Moreover, the drive part 20 is distribute | arranged so that the rear end (In FIG. 1, the upper end of the syringe 15) of the syringe 15 may be sealed.
Then, in order to pressurize the sealing material 33 in the syringe 15 and discharge the sealing material 33 from the nozzle 16, a gas introduction pipe 24 for feeding nitrogen gas or air into the syringe 15 is provided in the drive unit 20. The syringe 15 is connected to a gas introduction path 25 provided to communicate the inside and the outside of the syringe 15.
With such a structure, the sealing material 33 in the syringe 15 is pressurized by feeding nitrogen gas or air into the syringe 15 through the gas introduction pipe 24 and the gas introduction path 25. It can be discharged from the nozzle 16.

The cooling means 13 is arranged so as to surround the distal end surface 15b and the outer peripheral surface 15c of the syringe 15 except for the nozzle 16 with the syringe 15 as the center.
The cooling means 13 is generally configured by a cooling layer (not shown) provided with a refrigerant and a heat insulating layer (not shown) surrounding the cooling layer, which are arranged in order from the syringe 15 side.
With such a structure of the cooling means 13, the sealing material 33 in the syringe 15 can be uniformly cooled to a predetermined temperature, and the temperature can be kept constant.

The heating unit 14 includes a heating unit 21 including a heater provided with a plurality of housing units 23 for housing the package 39 on which the light emitting element 31 is mounted, and a package 39 on which the light emitting element 31 housed in the housing unit 23 is mounted. And a fixing jig 22 for fixing the.
With such a structure of the heating means 14, the package 39 on which the light emitting element 31 housed in the housing portion 23 is mounted can be uniformly heated to a predetermined temperature.

The heating means 14 is movable in a direction perpendicular to the tip of the nozzle 16 of the coating means 11 (the arrow direction in FIG. 1). At this time, the nozzle 16 may be movable.
Thereby, the package 39 on which the light emitting element 31 accommodated in the accommodating portion 23 is mounted can be disposed at a position facing the tip of the nozzle 16 of the application unit 11.

 Further, the drive unit 20 is electrically connected to a drive control unit (not shown) that controls the power of the drive unit 20, that is, the rotational speed of the stirring member 17, via a cable 26 made of an electric wire or the like.

 According to the light emitting device manufacturing apparatus 10 of this embodiment, while the sealing material 33 in the syringe 15 is cooled by the cooling means 13 surrounding the syringe 15, the sealing material 33 in the syringe 15 is uniformly distributed by the stirring means 1. In addition, the package 39 in which the light emitting element 31 is mounted by the heating means 14 can be uniformly heated to a predetermined temperature. Therefore, even when a large number of light emitting devices 30 are continuously manufactured, Thus, the variation in chromaticity can be greatly reduced, and the light emitting device 30 having a certain chromaticity can be stably manufactured with a high yield.

 In the light emitting device manufacturing apparatus 10 of this embodiment, the blades 19A, 19B, and 19C are exemplified as the blades constituting the stirring member 17, but the light emitting device manufacturing apparatus of the present invention is not limited to this. In the light emitting device manufacturing apparatus of the present invention, the number and shape of the blades constituting the stirring member are not limited as long as the blade can uniformly stir the sealing material in the syringe.

(Method for manufacturing light emitting device)
Next, with reference to FIG. 1, the manufacturing method of the light-emitting device of this embodiment is demonstrated.
First, the light emitting element 31 is mounted on the circuit pattern 34 of the package 39. At this time, the light emitting element 31 is disposed in the recess 38, the light emitting element 31 is fixed on the circuit pattern 34 by die bonding, and the electrode of the light emitting element 31 and the circuit pattern 34 are electrically connected by wire bonding with the gold wire 36. Connect.

Next, a large number of packages 39 on which the light emitting elements 31 are mounted are connected on the same surface by the package frame 40.
Next, after each package 39 connected by the package frame 40 is placed in the accommodating portion 23 provided in the heating portion 21 of the heating means 14, the package frame 40 is fixed to the heating portion 21 by the fixing jig 22. Thus, the package 39 is fixed to the heating unit 21.

 In parallel, while the sealing material 33 containing the fluorescent substance contained in the syringe 15 is cooled to a predetermined temperature by the cooling means 13, the concentration of the fluorescent substance is made uniform by the rotating stirring member 17. Stir so as to become (stirring step). This stirring process is continued while the process of applying the sealing material 33 in the syringe 15 to the light emitting element 31 mounted on the package 39 is being performed.

In this stirring step, the sealing material 33 containing the fluorescent material is preferably cooled to a temperature below the temperature at which the curing of the sealing material 33 starts, and more preferably to 5 ° C. or less.
Since the sealing material 33 is a thermosetting resin, when the temperature of the sealing material 33 exceeds the temperature at which the curing starts in the stirring step, the viscosity of the sealing material 33 is usually as the curing proceeds. It also rises at room temperature. As a result, an appropriate amount of the sealing material 33 is not applied to the light emitting element 31 in the step of applying the sealing material 33 containing the fluorescent material to the light emitting element 31 mounted on the package 39. If the application amount of the sealing material 33 is not appropriate, the light emitting device 30 having a predetermined chromaticity cannot be obtained. For example, when the light emitting device 30 is a white light emitting diode, the chromaticity of the light emitting device 30 changes to the blue side as time passes.

In the stirring step, when the sealing material 33 containing the fluorescent material is stirred by the rotating stirring member 17, the rotation speed of the stirring member 17 depends on the particle size of the fluorescent material, the viscosity of the sealing material 33, and the like. The rotation speed of the stirring member 17 is preferably 0.1 rotation / second or more and 5 rotation / second or less, and preferably 0.25 rotation / second or more and 3 rotation / second or less. More preferred.
If the rotation speed of the stirring member 17 is 0.1 rotation / second or more and 5 rotation / second or less, the sealing material 33 containing the fluorescent material can be stirred so that the concentration of the fluorescent material becomes uniform. it can.

 Further, in parallel with the above-described process, the package 39 on which the light emitting element 31 is mounted is heated before the sealing material 33 is applied to the light emitting element 31 mounted on the package 39 (heating process). This heating process is continued during the process of applying the sealing material 33 in the syringe 15 to the light emitting element 31 mounted on the package 39 and until the sealing material 33 is cured. .

In this heating step, it is preferable to heat the package 39 on which the light emitting element 31 is mounted to a temperature at which the curing of the sealing material 33 starts.
Since the sealing material 33 is a thermosetting resin, at the same time that the sealing material 33 is applied to the light emitting element 31 by heating the package 39 to a temperature higher than the temperature at which the sealing material 33 starts to be cured in the heating step. Then, curing of the sealing material 33 starts. Therefore, since the sealing material 33 is uniformly cured in a short time, in the cured sealing material 33, the fluorescent material is uniformly distributed without being settled in the recesses 38 of the package 39.

Next, the package 39 is moved together with the heating means 14 or the nozzle 16 is moved so that one of the packages 39 on which the light emitting element 31 is mounted is arranged at a position facing the tip of the nozzle 16 of the coating means 11. To do.
Next, nitrogen gas or air is fed into the syringe 15 through the gas introduction pipe 24 and the gas introduction path 25, the sealing material 33 in the syringe 15 is pressurized, the sealing material 33 is discharged from the nozzle 16, and the package It is applied to the light emitting element 31 mounted on 39. Then, when the recess 38 of the package 39 is sealed with a predetermined amount of the sealing material 33, the discharge of the sealing material 33 is stopped.
As described above, since the sealing material 33 starts to be cured at the same time as the sealing material 33 is applied to the light emitting element 31, it is cured to such an extent that the fluorescent material does not move immediately after the ejection of the sealing material 33 is stopped. When the heating is continued for a while, the sealing material 33 is completely cured and the light emitting device 30 is obtained.

 In the method of manufacturing the light emitting device according to this embodiment, when the application of the sealing material 33 to one package 39 is completed, the heating means 14 or the application means 11 is moved to a predetermined position, and another package is obtained. The process of applying the sealing material 33 to 39 is repeated, and the sealing material 33 is applied to all the packages 39 fixed to the heating unit 21.

 The light emitting device 30 thus obtained includes a package 32 on which a reflection surface 37 is formed, a light emitting element 31 mounted on a circuit pattern 34 formed on one surface of the package 32, and the light emitting element 31 sealed. And a sealing material 33 made of a transparent resin.

The light-emitting element 31 is appropriately selected from various light-emitting diodes that emit red to purple visible light or near-ultraviolet light according to the purpose of use.
As the package 32, a glass epoxy substrate, a hollow substrate, a ceramic substrate, or the like is used.

As the sealing material 33, a thermosetting transparent resin is used, and examples of such a transparent resin include a silicone resin and an epoxy resin.
As the fluorescent material added to the sealing material 33, a pigment or a phosphor that emits light by absorbing at least a part of the light emitted from the light emitting element 31 is used.

 Examples of the circuit pattern 34 include those formed by bonding a copper foil processed into a desired pattern to the package 32, a plating method, a vacuum deposition method, a method of printing a copper paste or a silver paste, and heat-curing. It is done.

 According to the method for manufacturing the light emitting device of this embodiment, in the stirring step, the sealing member 33 containing the fluorescent substance in the syringe 15 is cooled by the cooling means 13 to a predetermined temperature, and the rotating stirring member 17 rotates. The package 39 on which the light emitting element 31 is mounted is stirred before the sealing material 33 is applied to the light emitting element 31 mounted on the package 39 in the heating step while stirring so that the concentration of the fluorescent substance becomes uniform. In the case where a large number of light-emitting devices 30 are continuously manufactured by heating to a temperature higher than the temperature at which the sealing material 33 starts to be cured, the variation in chromaticity is greatly reduced and light emission having a constant chromaticity is achieved. The apparatus 30 can be manufactured stably with a high yield.

 Hereinafter, the present invention will be described more specifically with experimental examples, but the present invention is not limited to the following experimental examples.

"Experiment 1"
Using the light emitting device manufacturing apparatus 10 shown in FIG. 1, 1024 light emitting devices 30 were continuously manufactured.
As the sealing material 33, three types of silicone resins (silicone resin A, silicone resin B, silicone resin C) used in white light emitting diodes and three types of epoxy resins (epoxy resin D, epoxy resin E, Epoxy resin F) was used.
The sealing material 33 containing the fluorescent substance contained in the syringe 15 is fixed to the heating means 14 while being continuously stirred by the rotating stirring member 17 while being cooled to a predetermined temperature by the cooling means 13. A sealing material 33 was applied to the light emitting element 31 in the package 39. Under the present circumstances, the temperature of the sealing material 33 in the syringe 15 was adjusted to 25 degreeC (no cooling), 15 degreeC, 10 degreeC, 5 degreeC, 0 degreeC, and -5 degreeC.
In addition, the package 39 was heated by the heating unit 14 before the sealing material 33 was applied to the light emitting element 31, and the temperature of the package 39 was adjusted to a temperature at which the sealing material 33 began to be cured.
For all the light emitting devices 30 obtained, the chromaticity of the sealing material 33 containing the cured fluorescent material was measured, and the variation was examined.
Evaluated as (○) when there was no chromaticity variation, (△) when the chromaticity was monotonically or slightly changed periodically, and (×) when the chromaticity was monotonically or significantly changed periodically. did.
The results are shown in Table 1.

From the results in Table 1, when the temperature of the sealing material 33 in the syringe 15 is 10 ° C. or higher, the chromaticity varies, and when the temperature of the sealing material 33 in the syringe 15 is 5 ° C. or lower, the chromaticity is increased. It was confirmed that no variation occurred.
From the above results, the temperature of the package 39 is set to a temperature at which the curing of the sealing material 33 starts before the sealing material 33 in the syringe 15 is stirred and before the sealing material 33 is applied to the light emitting element 31. Even if it was adjusted, it was found that the chromaticity would not be stable unless the temperature of the sealing material 33 in the syringe 15 was adjusted to 5 ° C. or lower.

"Experimental example 2"
Using the light emitting device manufacturing apparatus 10 shown in FIG. 1, 1024 light emitting devices 30 were continuously manufactured.
As the sealing material 33, the thing similar to Experimental example 1 was used.
The sealing material 33 containing the fluorescent substance contained in the syringe 15 is fixed to the heating means 14 while being continuously stirred by the rotating stirring member 17 while being cooled to a predetermined temperature by the cooling means 13. A sealing material 33 was applied to the light emitting element 31 in the package 39. Under the present circumstances, the temperature of the sealing material 33 in the syringe 15 was adjusted to 25 degreeC (no cooling), 15 degreeC, 10 degreeC, 5 degreeC, 0 degreeC, and -5 degreeC.
In addition, before applying the sealing material 33 to the light emitting element 31, the heating means 14 does not heat the package 39, and after applying the sealing material 33 to all 1024 light emitting elements 31, the heating means 14 applies the package. 39 was heated to cure the sealing material 33.
For all the light emitting devices 30 obtained, the chromaticity of the sealing material 33 containing the cured fluorescent material was measured, and the variation was examined.
Evaluated as (○) when there was no chromaticity variation, (△) when the chromaticity was monotonically or slightly changed periodically, and (×) when the chromaticity was monotonically or significantly changed periodically. did.
The results are shown in Table 2.

 From the results in Table 2, the chromaticity can be improved even if the sealing material 33 in the syringe 15 is stirred while being cooled unless the package 39 is heated before the sealing material 33 is applied to the light emitting element 31. It was confirmed that variation occurred. This is because the sealing material 33 applied to the light emitting element 31 is not cured immediately after application, and thus the fluorescent material contained in the sealing material 33 gradually settles in the package until the curing starts. Thus, it is considered that the chromaticity gradually changes because the distribution of the fluorescent substance in the sealing material 33 becomes non-uniform. Therefore, if the sealing material 33 applied to 1000 or more light emitting elements 31 is cured together without heating the package 39, the chromaticity varies greatly.

"Experiment 3"
Using the light emitting device manufacturing apparatus 10 shown in FIG. 1, 1024 light emitting devices 30 were continuously manufactured.
As the sealing material 33, the thing similar to Experimental example 1 was used.
The sealing material 33 containing the fluorescent substance contained in the syringe 15 is fixed to the heating means 14 while being continuously stirred by the rotating stirring member 17 while being cooled to a predetermined temperature by the cooling means 13. A sealing material 33 was applied to the light emitting element 31 in the package 39. Under the present circumstances, the temperature of the sealing material 33 in the syringe 15 was adjusted to 25 degreeC (no cooling), 15 degreeC, 10 degreeC, 5 degreeC, 0 degreeC, and -5 degreeC.
Further, before applying the sealing material 33 to the light emitting element 31, the heating means 14 does not heat the package 39, and each time the sealing material 33 is applied to 128 light emitting elements, the heating means 14 applies the package. The process of heating 39 to cure the sealing material 33 was repeated 8 times.
For all the light emitting devices 30 obtained, the chromaticity of the sealing material 33 containing the cured fluorescent material was measured, and the variation was examined.
Evaluated as (○) when there was no chromaticity variation, (△) when the chromaticity was monotonically or slightly changed periodically, and (×) when the chromaticity was monotonically or significantly changed periodically. did.
The results are shown in Table 3.

 From the results in Table 3, even if the number of light emitting elements 31 to which the sealing material 33 is applied in a single process is smaller than that in Experimental Example 2, before the sealing material 33 is applied to the light emitting elements 31, the package 39 It was confirmed that variation in chromaticity would occur even if the sealing material 33 in the syringe 15 was stirred while being cooled unless it was heated. If the temperature of the sealing material 33 in the syringe 15 was 5 ° C. or less, the chromaticity variation was reduced, but the variation could not be completely eliminated.

"Experimental example 4"
Using the light emitting device manufacturing apparatus 10 shown in FIG. 1, 1024 light emitting devices 30 were continuously manufactured.
As the sealing material 33, the thing similar to Experimental example 1 was used.
The light-emitting element 31 in the package 39 fixed to the heating means 14 while cooling the sealing material 33 containing the fluorescent substance contained in the syringe 15 to a predetermined temperature by the cooling means 13 without stirring. The sealing material 33 was apply | coated to. Under the present circumstances, the temperature of the sealing material 33 in the syringe 15 was adjusted to 25 degreeC (no cooling), 15 degreeC, 10 degreeC, 5 degreeC, 0 degreeC, and -5 degreeC.
Further, the package 39 was heated by the heating means 14, and the temperature of the package 39 was adjusted to a temperature at which the curing of the sealing material 33 started.
For all the light emitting devices 30 obtained, the chromaticity of the sealing material 33 containing the cured fluorescent material was measured, and the variation was examined.
Evaluated as (○) when there was no chromaticity variation, (△) when the chromaticity was monotonically or slightly changed periodically, and (×) when the chromaticity was monotonically or significantly changed periodically. did.
The results are shown in Table 4.

 From the results in Table 4, the temperature of the package 39 is adjusted before the temperature of the sealing material 33 in the syringe 15 is adjusted to 5 ° C. or less and the sealing material 33 is applied to the light emitting element 31. It was found that the chromaticity is not stable unless the sealing material 33 in the syringe 15 is agitated even if the temperature is adjusted to the temperature at which the curing of the resin begins.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a schematic configuration diagram illustrating an embodiment of a light emitting device manufacturing apparatus according to the present invention, a part of which is shown in cross section.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 ... Manufacturing apparatus of light-emitting device, 11 ... Application | coating means, 12 ... Stirring means, 13 ... Cooling means, 14 ... Heating means, 15 ... Syringe, 16 ... Nozzle, 17 ... Stirring member, 18 ... Rotating shaft, 19 ... Blade, 20 ... Drive part, 21 ... Heating part, 22 ... Fixing jig, 23 ... Storage part, 24 ..Gas introduction pipe, 25... Gas introduction path, 26.

Claims (4)

A light emitting element is mounted on a package, and the light emitting element includes a fluorescent material that emits light by absorbing at least a part of light emitted from the light emitting element, and is coated with a sealing material that seals the light emitting element. A method of manufacturing a light emitting device by:
By stirring the sealing material while cooling, the sealing material is applied to the light emitting element while suppressing an increase in viscosity, and the light emitting element is applied before the sealing material is applied to the light emitting element. The method of manufacturing a light emitting device, wherein the package is heated to a temperature at which the package is cured immediately after the sealing material is applied to the light emitting element.  The method for manufacturing a light emitting device according to claim 1, wherein the sealing material is cooled to 5 ° C. or lower in the stirring step.  In the stirring step, the sealing material containing the fluorescent material is stirred by a rotating stirring member, and the rotation speed of the stirring member is 0.1 rotation / second or more and 5 rotation / second or less. The manufacturing method of the light-emitting device of Claim 1 or 2.  The method for manufacturing a light emitting device according to claim 1, wherein, in the heating step, the package on which the light emitting element is mounted is heated to a temperature higher than a temperature at which the sealing material starts to be cured.

Images