JP2014093419A - Manufacturing method of light-emitting device and light-emitting device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a manufacturing method of a light-emitting device and a light-emitting device capable of easily fine adjusting color of a light from the light-emitting device.SOLUTION: A mount board 12 has a concave 121 formed in one surface and a light emitting element 11 mounted on a bottom plane of the concave 121. A first color conversion section part 13 contains a first fluorescent substance as a translucency material and is disposed within the concave 121 covering the light emitting element 11 to convert the wavelength of the light from the light emitting element 11 with the first fluorescent substance. A second color conversion part 14 is formed of a translucency material containing a second fluorescent substance in a sheet-like shape, and is disposed to cover an opening of the concave 121 to convert the wavelength of the light from the first color conversion section part 13 with the second fluorescent substance. A manufacturing method of the light-emitting device 1 includes the steps of: measuring the color of the light from the light-emitting device 1 in a state the second color conversion part 14 is not disposed yet; and adjusting the color of the light from the light-emitting device 1 by processing the second color conversion part 14 based on the measured color of the light.

Description

  The present invention relates to a method for manufacturing a light-emitting device in which a light-emitting element is covered with a color conversion unit including a phosphor that converts wavelength of light, and the light-emitting device.

  2. Description of the Related Art Conventionally, a light emitting device that emits light of a color different from the light emission color of a light emitting element or white light by combining a light emitting element (LED chip) and a color conversion unit (wavelength conversion unit) containing a phosphor. Provided (for example, see Patent Document 1). The light-emitting device described in Patent Document 1 is configured such that a light-emitting element is mounted on the bottom surface of a concave portion of a mounting substrate, and a sheet-like color conversion unit is bonded and fixed to the upper surface of the mounting substrate so as to cover the opening of the concave portion. Yes. For example, when the light emitting element emits blue light, the color conversion unit includes a phosphor that absorbs blue light and generates yellow light, and the blue light and the yellow light are mixed with an appropriate intensity balance. Thus, the light from the light emitting device is recognized as white light.

  Here, the color conversion unit is provided with a phosphor region part including the phosphor and a transparent region part not including the phosphor, and in the manufacturing process of the light emitting device, the phosphor region part and the transparent region in the opening region of the recess. It is possible to slide so that the ratio with the part can be adjusted. This light emitting device can adjust the color tone by adjusting the intensity balance of the mixed colors by sliding the color conversion unit before the color conversion unit is bonded and fixed to the mounting substrate in the manufacturing process.

  Further, in Patent Document 1, a part of the surface of the phosphor region portion of the color conversion portion is cut to form a transparent portion including a cut-off portion, or an increase portion that increases the thickness of the phosphor sheet is added to the phosphor. It is also described that a color conversion unit is provided on a sheet. In these configurations, the light-emitting device balances the intensity of the color mixture by determining the cutting area of the cutting removal portion and the thickness of the phosphor sheet according to the difference between the chromaticity coordinates as the light emission characteristics and the reference. Can be adjusted.

JP 2011-66460 A

  However, in the light emitting device described in Patent Document 1, since the light from the light emitting element is wavelength-converted only by the color conversion unit, the ratio of the phosphor region part and the transparent region unit, the cutting area of the cutting removal unit and the fluorescence A slight change in the thickness of the body sheet may greatly change the light emission color of the light emitting device. Therefore, this light emitting device has a problem that it is difficult to finely adjust the emission color.

  The present invention has been made in view of the above reasons, and an object of the present invention is to provide a method for manufacturing a light emitting device and a light emitting device in which fine adjustment of the emission color of the light emitting device is simple.

  The light emitting device manufacturing method of the present invention includes a light emitting element, a mounting substrate on which the light emitting element is mounted in a recess formed on one surface, and the light emitting element disposed in the recess so as to cover the light emitting element. A translucent material including a first color conversion unit including a first phosphor that converts the wavelength of light from the first phosphor and a second phosphor that converts the wavelength of light from the first color conversion unit A light emitting device manufacturing method comprising: a second color conversion unit that is formed in a sheet shape and is installed so as to close an opening surface of the concave portion, wherein the first color conversion unit is disposed and the first color conversion unit is disposed. A measurement step of measuring the emission color of the light emitting device in a state where the second color conversion unit is not installed, and the second color conversion unit is installed based on the emission color measured in the measurement step In order to reduce the difference between the emission color of the light emitting device in the state and the predetermined target color, An adjustment step of adjusting the emission color of the light emitting device by adjusting at least one of the thickness of the second color conversion unit and the opening area of the hole penetrating the second color conversion unit. It is characterized by.

  The light emitting device manufacturing method of the present invention includes a light emitting element, a mounting substrate on which the light emitting element is mounted in a recess formed on one surface, and the light emitting element disposed in the recess so as to cover the light emitting element. A first color conversion unit including a first phosphor that converts the wavelength of light from the first phosphor, and a second phosphor that converts the wavelength of light from the first color conversion unit are attached to the surface of the transparent sheet. And a second color conversion unit installed so as to close the opening surface of the recess, wherein the first color conversion unit is disposed and the second color conversion unit is provided. A measurement step of measuring the emission color of the light emitting device in a state in which no part is installed, and the second color conversion unit in a state of being installed based on the emission color measured in the measurement step The transparent sheet is reduced so that the difference between the emission color of the light emitting device and the predetermined target color is reduced. By adjusting the deposition amount of the second phosphor for preparative, and having an adjusting step of adjusting the emission color of the light emitting device.

  In this method of manufacturing a light emitting device, before the adjustment step, there is an assembly step of installing the transparent sheet in a state where the second phosphor is not attached so as to close the opening surface of the concave portion, In the adjusting step, it is preferable that the second phosphor is attached to a surface of the transparent sheet opposite to the mounting substrate.

  In the method for manufacturing the light emitting device, in the adjustment step, the second color conversion unit is formed by attaching the second phosphor to the transparent sheet, and the second color is formed after the adjustment step. It is desirable to have an assembly process in which the conversion unit is installed so as to block the opening surface of the recess.

  The light-emitting device of the present invention includes a light-emitting element, a mounting substrate on which the light-emitting element is mounted in a recess formed on one surface, and a light from the light-emitting element that is disposed in the recess so as to cover the light-emitting element. A first color conversion unit including a first phosphor that converts the wavelength of the first phosphor, and a second phosphor that is installed so as to block the opening surface of the recess and converts the wavelength of light from the first color conversion unit. And a second color conversion unit for adjusting the emission color.

  According to the present invention, since the light emission color of the light emitting device is adjusted by the second color conversion unit based on the light emission color measured in the measurement process, there is an advantage that fine adjustment of the light emission color of the light emitting device is easy. .

1 is a cross-sectional view illustrating a light emitting device according to Embodiment 1. FIG. 3 is a flowchart illustrating a method for manufacturing the light emitting device according to the first embodiment. 5 is an explanatory diagram of a method for manufacturing the light emitting device according to Embodiment 1. FIG. 6 is a cross-sectional view showing a light emitting device according to Embodiment 2. FIG. It is sectional drawing which shows the other example of the light-emitting device which concerns on Embodiment 2. FIG.

(Embodiment 1)
The light-emitting device 1 of this embodiment is provided with the light emitting element 11 which consists of a light emitting diode (henceforth LED) as shown in FIG. In addition to the light emitting element 11, the light emitting device 1 includes a mounting substrate 12 on which the light emitting element 11 is mounted, a first color conversion unit 13 including a first phosphor (not shown), and a second phosphor ( And a second color conversion unit 14 including the second color conversion unit 14.

  The mounting substrate 12 has a recess 121 formed on one surface (the upper surface in FIG. 1), and the light emitting element 11 is mounted on the bottom surface of the recess 121. The recess 121 has a rectangular cross section (here, a square shape) along the opening surface, and has an inner surface tapered so that the opening area increases toward the opening surface. In the example of FIG. 1, the mounting substrate 12 has a two-layer structure of a first layer 122 and a second layer 123, and is recessed so as to penetrate the second layer 123 in the thickness direction (vertical direction in FIG. 1). 121 is formed, and the first layer 122 is exposed on the bottom surface of the recess 121. That is, the second layer 123 constitutes the side wall of the recess 121.

  Here, the light emitting element 11 is die-bonded to one of a pair of electrodes (not shown) disposed on the bottom surface of the recess 121, and is electrically connected to the other by a bonding wire 15. The pair of electrodes is electrically connected to a pair of pads (not shown) formed on the back surface (the lower surface in FIG. 1) of the mounting substrate 12. With this configuration, the light emitting element 11 emits light when a voltage is applied between the pair of pads.

  The first color conversion unit 13 contains the first phosphor in the translucent material, and is disposed in the recess 121 so as to cover the light emitting element 11. The first phosphor converts the light emitting element 11 from the light emitting element 11. Wavelength conversion. The first phosphor is excited by absorbing light emitted from the light emitting element 11 (hereinafter referred to as first light) and has a wavelength different from that of the first light (hereinafter referred to as second light). ). The translucent material of the first color conversion unit 13 is made of, for example, silicone resin, acrylic resin, epoxy resin, polycarbonate resin, or the like. The first phosphors (phosphor particles) contained in these translucent materials are dispersed substantially uniformly in the translucent material.

  In addition, the first color conversion unit 13 is filled not to completely fill the recess 121 but to leave a gap 124 between the opening surface of the recess 121 and the surface thereof is located on the center side of the recess 121. It is formed in a curved shape that is concave. That is, the filling here includes a state in which the first color conversion unit 13 fills the concave portion 121 leaving the gap 124. Here, the first color conversion unit 13 covers not only the light emitting element 11 but also the bonding wire 15.

  Here, since the phosphor is generally excited by light having a shorter wavelength than the light emitted by itself (second light), the light emitted from the first phosphor is emitted from the light emitting element 11. The light has a longer wavelength than the emitted light. As an example, a blue LED chip having a peak wavelength of 450 nm is used for the light emitting element 11, and the first phosphor of the first color conversion unit 13 is excited by the emitted light from the light emitting element 11 to 450 nm. A phosphor that emits green light having a longer wavelength is used.

  With the above configuration, in the light emitting device 1, when the light emitting element 11 emits light, a part of the first light from the light emitting element 11 is absorbed by the first phosphor contained in the first color conversion unit 13. Thus, the first phosphor is excited and emits second light having a wavelength longer than that of the light emitting element 11. In other words, a part of the first light from the light emitting element 11 is converted into light of a different color (second light) by the first color conversion unit 13 covering the light emitting element 11 (color conversion). Is done. On the other hand, since the remainder of the first light is not absorbed by the first phosphor and passes through the first color conversion unit 13, the first color conversion unit 13 receives the first light from the light emitting element 11. The light of the color which mixed the light of 2 and the 2nd light wavelength-converted with the 1st fluorescent substance is radiated | emitted.

  The second color conversion unit 14 contains the second phosphor in the translucent material and covers the first color conversion unit 13 by being installed so as to close the opening surface of the recess 121. The wavelength of the light from the first color conversion unit 13 is converted by the second phosphor. The second phosphor is excited by absorbing light emitted from the first color conversion unit 13 (hereinafter referred to as third light) and has a wavelength different from that of the third light (hereinafter referred to as first light). 4). The translucent material of the second color conversion unit 14 is made of, for example, a silicone resin, an acrylic resin, an epoxy resin, a polycarbonate resin, or the like. The second phosphors (phosphor particles) contained in these translucent materials are dispersed substantially uniformly in the translucent material.

  The second color conversion unit 14 is formed in a sheet shape, and is disposed so as to close the opening surface of the recess 121 while leaving a gap 124 between the second color conversion unit 14 and the first color conversion unit 13. The second color conversion unit 14 is a substantially flat plate and is disposed on one surface (the upper surface in FIG. 1) of the mounting substrate 12 so as to be parallel to the light extraction surface (the upper surface in FIG. 1) of the light emitting element 11. Has been. The second color conversion unit 14 is fixed to the mounting substrate 12 with an adhesive or the like.

  Here, since the phosphor is generally excited by light having a shorter wavelength than the light emitted by itself (fourth light), the light emitted from the second phosphor is subjected to the first color conversion. Compared with the light from the unit 13, the light has a longer wavelength. As an example, when the light emitting element 11 is a blue LED chip and the first phosphor emits green light as described above, the second phosphor of the second color conversion unit 14 includes the first phosphor Two types of phosphors are used that are excited by the emitted light from the color conversion unit 13 and emit yellow and red light.

  With the above configuration, the light-emitting device 1 causes the second phosphor in which part of the third light from the first color conversion unit 13 is contained in the second color conversion unit 14 when the light-emitting element 11 emits light. By being absorbed, the second phosphor is excited and emits fourth light having a wavelength longer than that of the first color conversion unit 13. In other words, a part of the third light from the first color conversion unit 13 is light of a different color (fourth light) by the second color conversion unit 14 covering the first color conversion unit 13. ) Is wavelength converted (color converted). On the other hand, since the remainder of the third light is not absorbed by the second phosphor and passes through the second color conversion unit 14, the second color conversion unit 14 sends the first color conversion unit 13. The light of the color which mixed the 3rd light from 4th and the 4th light wavelength-converted with the 2nd fluorescent substance is radiated | emitted.

  As a result, when the light emitting element 11 emits light, the light emitting device 1 emits light (here, white light) having a spectral distribution in a relatively wide wavelength range (for example, about 400 nm to 680 nm).

  By the way, in the light emitting device 1 having the above-described configuration, the emission color is adjusted by processing the second color conversion unit 14 in the manufacturing process. That is, the light emitting device 1 may vary in emission color due to variations in emission wavelength and brightness for each light emitting element 11 and variations in the filling amount of the first color conversion unit 13. In order to solve this problem, it is necessary to adjust the emission color. Therefore, in the method for manufacturing the light emitting device 1 according to the present embodiment, as described below, the second color conversion is performed based on the measurement step of measuring the emission color of the light emitting device 1 and the emission color measured in the measurement step. An adjustment step of adjusting the emission color of the light emitting device 1 by processing the portion 14.

  Hereinafter, the manufacturing method of the light-emitting device 1 of this embodiment is demonstrated with reference to FIG.

  That is, first, in the mounting process, the light emitting element 11 is mounted on the mounting substrate 12 in which the recess 121 is formed (S1). Then, in the filling step, the translucent material containing the first phosphor is filled into the recess 121 of the mounting substrate 12 to form the first color conversion unit 13 (S2).

  Next, in the measurement process, the measuring instrument (not shown) emits light from the light-emitting device 1 in a state where the first color conversion unit 13 is filled and the second color conversion unit 14 is not installed. The color is measured (S3). That is, in the measurement step, the light emission color of the light emitting device 1 when the light emitting device 11 is caused to emit light by energizing the light emitting device 1 in a state before the second color conversion unit 14 is attached is measured. The luminescent color here includes the chromaticity, color tone (brightness and saturation), color temperature, and the like of the emitted light, and a known light source color measuring device such as a color luminance meter is used as the measuring instrument. In this embodiment, as an example, it is assumed that the chromaticity of the emitted light from the light emitting device 1 (coordinate values on the xy chromaticity diagram) is measured by a measuring instrument.

  In the next adjustment process, based on the emission color measured in the measurement process, the difference between the emission color of the light emitting device 1 and the predetermined target color when the second color conversion unit 14 is installed is reduced. As described above, the second color conversion unit 14 is processed (S4). Here, in the present embodiment, since it is the chromaticity of the emitted light from the light emitting device 1 that is measured in the measurement process, in the adjustment process, the measurement result in the measurement process is set to the difference from the chromaticity of the target color. Accordingly, the second color conversion unit 14 is processed so that the measurement result approaches the target color on the chromaticity diagram.

  Here, since the 2nd color conversion part 14 is formed in the sheet form with the translucent material containing the 2nd fluorescent substance, the thickness and the opening area of the hole which penetrates self in the thickness direction The light emission color of the light emitting device 1 can be adjusted by adjusting at least one of the above. That is, the second color conversion unit 14 has a smaller amount of the second phosphor as the thickness becomes smaller, even if the concentration of the second phosphor in the light-transmitting material that is the base is fixed. In addition, the amount of the second phosphor decreases as the opening area of the hole increases. Therefore, the second color conversion unit 14 has a thickness and a hole opening area, and the light that passes through the second color conversion unit 14 as it is (without wavelength conversion) and the light that is wavelength-converted by the second phosphor. And the emission color of the light emitting device 1 changes.

  In the present embodiment, a laser irradiator (not shown) is used to process the second color conversion unit 14, and the laser irradiator is used for the second color conversion unit 14 before being fixed to the mounting substrate 12. By irradiating the laser, the second color conversion unit 14 is trimmed (laser trimming). As a result, the second color conversion unit 14 is formed with a hole (including a slit) 141 penetrating in the thickness direction as shown in FIG. In other words, the laser irradiator adjusts the opening area of the hole 141 penetrating the second color conversion unit 14 in the thickness direction by adjusting the laser irradiation range, and as a result, the emission color of the light emitting device 1 is changed. Can be adjusted. In the laser irradiation machine, when a plurality of holes 141 (3 × 4 = 12 in the example of FIG. 3) are formed in one second color conversion unit 14 as shown in FIG. The opening area of the hole 141 may be adjusted by the above.

  Here, the relationship between the opening area of the hole 141 formed in the second color conversion unit 14 in the adjustment process and the measurement result (chromaticity) in the measurement process is stored in advance in the memory of the laser irradiator as a table. Alternatively, it may be expressed as a function of the measurement result in the measurement process. The laser irradiator determines the opening area and shape of the hole 141 formed in the second color conversion unit 14 based on the measurement result by acquiring the measurement result from the measuring instrument.

  The second color conversion unit 14 processed in the adjustment step in this manner is the light emitting device (the second color conversion unit 14 is attached to the measurement target in the measurement step in the assembly step after the adjustment step). (S5) before being attached (S5). That is, the second color conversion unit 14 is fixed to the mounting substrate 12 of the light emitting device 1 in a state where the light emitting element 11 is mounted and the concave portion 121 is filled with the first color conversion unit 13 with an adhesive or the like. Is done.

  According to the light emitting device 1 of the present embodiment described above, the manufacturing method includes a measurement process for measuring the emission color and an adjustment for processing the second color conversion unit 14 based on the emission color measured in the measurement process. Fine adjustment of the emission color is easy. That is, in the measurement step, the light emission color of the light emitting device 1 at the time of light emission of the light emitting element 11 in a state where the second color conversion unit 14 is not installed is measured, and in the adjustment step, the light emission device is based on the result. The second color conversion unit 14 is processed so that the one emission color approaches the target color. Therefore, by adding the second color conversion unit 14 that has undergone the adjustment process to the light-emitting device 1 (the state before the second color conversion unit 14 is attached) 1 that is a measurement target in the measurement process, the light-emitting device. The emission color of 1 approaches the target color.

  Moreover, in the light emitting device 1, the light from the light emitting element 11 is not wavelength-converted only by the second color converter 14, but is also wavelength-converted by the first color converter 13. In the adjustment step, only the second color conversion unit 14 is processed, and the first color conversion unit 13 is not processed. Therefore, the emission color of the light emitting device 1 is significantly changed in the adjustment step. There is no end to it. Therefore, according to the manufacturing method of the light emitting device 1, there is an advantage that fine adjustment of the emission color of the light emitting device is easy. Therefore, color unevenness is less likely to occur in an appliance or the like equipped with a plurality of light emitting devices 1.

  In the present embodiment, the wavelength (color) of the emitted light is the same between the first phosphor included in the first color converter 13 and the second phosphor included in the second color converter 14. Is different. Therefore, in the light emitting device 1, since at least three colors of light emitted from the light emitting element 11, the first phosphor, and the second phosphor are mixed to determine the emission color, only two colors of light are mixed. Various emission colors can be realized as compared with the case of the above. Further, the light emitting device 1 has an advantage that the color rendering properties are high because the emitted light contains more wavelength components than when only two colors of light are mixed.

  Moreover, in this embodiment, the thickness of the 2nd color conversion part 14 formed in the sheet form with the translucent material containing the 2nd fluorescent substance in the adjustment process, and the 2nd color conversion part 14 The light emission color of the light emitting device 1 is adjusted by adjusting at least one of the opening area of the hole 141 passing through the light emitting device. According to this configuration, fine adjustment of the emission color of the light emitting device 1 can be easily performed by finely processing the second color conversion unit 14 by, for example, laser trimming as described above.

  Note that the first phosphor included in the first color converter 13 and the second phosphor included in the second color converter 14 may have the same wavelength (color) of emitted light. Good. In this case, the same phosphor can be used for the first phosphor and the second phosphor.

  In addition, as described above, it is not essential that the first phosphor is green and the second phosphor is yellow or red as described above, and can be set as appropriate. For example, the light emitting device 1 realizes a color close to the target color (white in the present embodiment) by using only the first color conversion unit 13, and the second color conversion unit 14 is used for fine color adjustment. Also good. As a specific example in that case, if the light emitting element 11 is a blue LED chip, the first phosphor and the second phosphor are all three types of phosphors of yellow, red, and green. Therefore, only the composition is set to be different. Depending on the relationship between the target color and the original color, the first phosphor and the second phosphor may be the same up to the blending.

  As described above, when a color close to the target color is realized only by the first color conversion unit 13, the light emitting device 1 has the light emitting element 11 mounted on the mounting substrate 12 and the first color conversion unit 13 is already installed. Even when a package (off-the-shelf) is provided, the color can be finely adjusted. That is, the light emitting device 1 includes a measurement process for measuring the emission color of the package and an adjustment process for processing the second color conversion unit 14 based on the emission color measured in the measurement process. Thus, the color can be finely adjusted by the second color conversion unit 14 added to the package. Therefore, according to the configuration of the present embodiment, it is possible to reduce the influence of color variations of ready-made products (packages).

  Furthermore, in the adjustment step, not only the amount of the second phosphor is adjusted by processing the second color conversion unit 14, but also the color (composition) of the second phosphor itself is a measurement result in the measurement step. Adjustment (selection) may be performed based on the above, and in that case, the adjustment accuracy becomes higher.

(Embodiment 2)
The light emitting device 1 of the present embodiment is the same as that of the first embodiment in that the second phosphor 143 is attached to the surface of the transparent sheet 142 to form the second color conversion unit 14 as shown in FIG. Different from the light emitting device 1. Hereinafter, the same configurations as those of the first embodiment are denoted by common reference numerals, and description thereof is omitted as appropriate.

  In other words, in the present embodiment, the second phosphor 143 is attached to the surface of the transparent sheet 142 made of the translucent material, instead of mixing the second phosphor into the translucent material. The color conversion unit 14 is configured. Here, the composition of the translucent material on which the transparent sheet 142 is based and the second phosphor 143 is the same as in the first embodiment. That is, as the second phosphor 143, two types of phosphors that emit yellow and red light are used.

  In the present embodiment, a supply device (not shown) for supplying the second phosphor 143 in the adjustment step adjusts the amount of the second phosphor 143 attached to the transparent sheet 142, thereby providing a light emitting device. 1 emission color is adjusted. In short, the light emitting device 1 of the present embodiment adjusts the light emission color by modifying the second color conversion unit 14 based on the measurement result in the measurement process in the adjustment process, as in the first embodiment. Is done. For this reason, in the adjustment step, the emission color of the light emitting device 1 is adjusted by adjusting the amount of the second phosphor 143 attached, instead of removing a part of the second color conversion unit 14 by laser trimming or the like. be able to. Therefore, compared with the case where a part of the second color conversion unit 14 is removed in the adjustment process, the yield is improved by the amount that the light-transmitting material and the second phosphor 143 are not wasted.

  Note that the amount of adhesion of the second phosphor 143 may be stored in advance in the memory of the supply device as a table of the relationship with the measurement result (chromaticity) in the measurement step, or the measurement result in the measurement step It may be expressed as a function. The supply device acquires the measurement result from the measuring instrument, and determines the supply amount of the second phosphor 143 to the transparent sheet 142 based on the measurement result.

  Here, as a specific procedure of the adjustment process of the present embodiment, a method of attaching the second phosphor 143 after the transparent sheet 142 is installed on the opening surface of the recess 121, and the second phosphor first. There is a method of installing the transparent sheet 142 on the opening surface of the recess 121 after attaching 143.

  That is, in the former method, first, in the assembly process before the adjustment process, the transparent sheet 142 in a state where the second phosphor 143 is not attached is installed so as to block the opening surface of the recess 121. Then, in the adjustment step, the second phosphor 143 is attached to the surface of the transparent sheet 142 opposite to the mounting substrate 12 (upper surface in FIG. 4), whereby the second color conversion unit 14 is formed. According to this method, the amount of adhesion of the second phosphor 143 can be adjusted in a state where the second color conversion unit 14 is attached to the mounting substrate 12, so that the second phosphor 143 is once adhered and then the light emission is performed. It is possible to readjust the emission color of the device 1 and readjust the amount of adhesion of the second phosphor 143. In short, by repeatedly performing the measurement process and the adjustment process, the light emitting device 1 can realize a light emission color closer to the target color.

  In the latter method, the second color conversion unit 14 is formed by first attaching the second phosphor 143 to the transparent sheet 142 in the adjustment step. Then, in the assembly process, the second color conversion unit 14 formed in the previous adjustment process is installed so as to block the opening surface of the recess 121. According to this method, since the second phosphor 143 is attached before the transparent sheet 142 is attached to the mounting substrate 12, not only the surface of the transparent sheet 142 opposite to the mounting substrate 12 but also the mounting substrate 12 side. The second phosphor 143 can also be attached to the surface (the lower surface in FIG. 4).

  In the example of FIG. 4, the second phosphor 143 is directly attached to the transparent sheet 142 by thermal welding or laser welding. In other words, in the case of heat welding, the entire thermoplastic transparent sheet 142 is heated, and immediately after that, the second phosphor 143 is applied to the surface of the transparent sheet 142, whereby the second phosphor 143 is applied to the transparent sheet 142. To attach. In the case of laser welding, a part of the thermoplastic transparent sheet 142 is irradiated with laser, and immediately after that, the second phosphor 143 is applied to the surface of the transparent sheet 142, whereby the second phosphor is applied to the transparent sheet 142. 143 is deposited. Further, in the case of laser welding, a part of the transparent sheet 142 having the surface coated with the second phosphor 143 is irradiated with laser to dissolve the second phosphor 143, whereby the second sheet is applied to the transparent sheet 142. A phosphor 143 may be attached.

  In the case of laser welding, since the region where the second phosphor 143 adheres on the transparent sheet 142 can be finely determined according to the laser irradiation range, fine adjustment of the amount of adhesion of the second phosphor 143 is easy. become.

  Furthermore, as a method of attaching the second phosphor 143 to the transparent sheet 142, the particles of the second phosphor 143 are directly attached as shown in FIG. 4, and coating, dripping and printing are shown as shown in FIG. The second phosphor 143 may be attached by a method such as the above. That is, in the example of FIG. 5, the liquid resin mixed with the second phosphor 143 is attached to the transparent sheet 142 by a method such as coating, dripping (potting), printing (inkjet), and the liquid resin is cured. As a result, the second phosphor 143 is attached to the transparent sheet 142.

  In this case, since the region where the liquid resin containing the second phosphor 143 adheres on the transparent sheet 142 can be finely determined by a printing pattern or the like, fine adjustment of the amount of adhesion of the second phosphor 143 is easy. Become. In addition, when two or more kinds of phosphors are used as the second phosphor 143, the adhesion region on the transparent sheet 142 can be determined for each kind of the phosphor, so that the light emission color of the light emitting device 1 can be determined. Fine adjustment is possible. For example, in the example of FIG. 5, a phosphor that emits red light adheres to a region of the transparent sheet 142 that is in front of (directly above) the light emitting element 11, and a phosphor that emits yellow light around the phosphor. Is attached.

  Other configurations and functions are the same as those of the first embodiment.

DESCRIPTION OF SYMBOLS 1 Light-emitting device 11 Light-emitting element 12 Mounting board 121 Recessed part 13 1st color conversion part 14 2nd color conversion part 141 Hole 142 Transparent sheet 143 2nd fluorescent substance

Claims (5)

A light-emitting element; a mounting substrate on which the light-emitting element is mounted in a recess formed on one surface; and a first light source disposed in the recess so as to cover the light-emitting element and wavelength-converting light from the light-emitting element An opening surface of the concave portion formed in a sheet shape with a translucent material containing a first color conversion portion including a phosphor and a second phosphor that converts the wavelength of light from the first color conversion portion. And a second color conversion unit installed so as to block the light emitting device,
A measurement step of measuring a light emission color of the light emitting device in a state where the first color conversion unit is arranged and the second color conversion unit is not installed;
Based on the luminescent color measured in the measuring step, the second color so that the difference between the luminescent color of the light emitting device and the predetermined target color when the second color conversion unit is installed is reduced. Adjusting the emission color of the light emitting device by adjusting at least one of the thickness of the color conversion portion and the opening area of the hole penetrating the second color conversion portion. A method for manufacturing a light emitting device. A light-emitting element; a mounting substrate on which the light-emitting element is mounted in a recess formed on one surface; and a first light source disposed in the recess so as to cover the light-emitting element and wavelength-converting light from the light-emitting element. A first color conversion unit including a phosphor and a second phosphor that converts the wavelength of light from the first color conversion unit are attached to the surface of the transparent sheet so as to block the opening surface of the recess. A method of manufacturing a light emitting device including a second color conversion unit to be installed,
A measurement step of measuring a light emission color of the light emitting device in a state where the first color conversion unit is arranged and the second color conversion unit is not installed;
Based on the emission color measured in the measurement step, the transparent sheet so that the difference between the emission color of the light emitting device and the predetermined target color in a state where the second color conversion unit is installed is reduced. And adjusting the emission color of the light emitting device by adjusting the amount of the second phosphor adhering to the light emitting device. Before the adjustment step, the assembly step of installing the transparent sheet in a state where the second phosphor is not attached so as to close the opening surface of the recess,
3. The method of manufacturing a light emitting device according to claim 2, wherein, in the adjustment step, the second phosphor is attached to a surface of the transparent sheet opposite to the mounting substrate. In the adjustment step, the second color conversion unit is formed by attaching the second phosphor to the transparent sheet,
The method of manufacturing a light emitting device according to claim 2, further comprising an assembly step of installing the second color conversion unit so as to block the opening surface of the recess after the adjustment step. A light-emitting element; a mounting substrate on which the light-emitting element is mounted in a recess formed on one surface; and a first light source disposed in the recess so as to cover the light-emitting element and wavelength-converting light from the light-emitting element. A first color conversion unit including a phosphor, and a second color-adjusting unit that includes a second phosphor that is installed so as to close the opening surface of the recess and converts the wavelength of light from the first color conversion unit. And a color conversion unit.

Images