WO2017134994A1 - 発光装置およびその製造方法 - Google Patents
発光装置およびその製造方法 Download PDFInfo
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- WO2017134994A1 WO2017134994A1 PCT/JP2017/000661 JP2017000661W WO2017134994A1 WO 2017134994 A1 WO2017134994 A1 WO 2017134994A1 JP 2017000661 W JP2017000661 W JP 2017000661W WO 2017134994 A1 WO2017134994 A1 WO 2017134994A1
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- 229910015802 BaSr Inorganic materials 0.000 description 1
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L33/00—Semiconductor devices having potential barriers specially adapted for light emission; Processes or apparatus specially adapted for the manufacture or treatment thereof or of parts thereof; Details thereof
- H01L33/48—Semiconductor devices having potential barriers specially adapted for light emission; Processes or apparatus specially adapted for the manufacture or treatment thereof or of parts thereof; Details thereof characterised by the semiconductor body packages
- H01L33/50—Wavelength conversion elements
- H01L33/501—Wavelength conversion elements characterised by the materials, e.g. binder
- H01L33/502—Wavelength conversion materials
- H01L33/504—Elements with two or more wavelength conversion materials
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L25/00—Assemblies consisting of a plurality of individual semiconductor or other solid state devices ; Multistep manufacturing processes thereof
- H01L25/03—Assemblies consisting of a plurality of individual semiconductor or other solid state devices ; Multistep manufacturing processes thereof all the devices being of a type provided for in the same subgroup of groups H01L27/00 - H01L33/00, or in a single subclass of H10K, H10N, e.g. assemblies of rectifier diodes
- H01L25/04—Assemblies consisting of a plurality of individual semiconductor or other solid state devices ; Multistep manufacturing processes thereof all the devices being of a type provided for in the same subgroup of groups H01L27/00 - H01L33/00, or in a single subclass of H10K, H10N, e.g. assemblies of rectifier diodes the devices not having separate containers
- H01L25/075—Assemblies consisting of a plurality of individual semiconductor or other solid state devices ; Multistep manufacturing processes thereof all the devices being of a type provided for in the same subgroup of groups H01L27/00 - H01L33/00, or in a single subclass of H10K, H10N, e.g. assemblies of rectifier diodes the devices not having separate containers the devices being of a type provided for in group H01L33/00
- H01L25/0753—Assemblies consisting of a plurality of individual semiconductor or other solid state devices ; Multistep manufacturing processes thereof all the devices being of a type provided for in the same subgroup of groups H01L27/00 - H01L33/00, or in a single subclass of H10K, H10N, e.g. assemblies of rectifier diodes the devices not having separate containers the devices being of a type provided for in group H01L33/00 the devices being arranged next to each other
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L27/00—Devices consisting of a plurality of semiconductor or other solid-state components formed in or on a common substrate
- H01L27/15—Devices consisting of a plurality of semiconductor or other solid-state components formed in or on a common substrate including semiconductor components having potential barriers, specially adapted for light emission
- H01L27/153—Devices consisting of a plurality of semiconductor or other solid-state components formed in or on a common substrate including semiconductor components having potential barriers, specially adapted for light emission in a repetitive configuration, e.g. LED bars
- H01L27/156—Devices consisting of a plurality of semiconductor or other solid-state components formed in or on a common substrate including semiconductor components having potential barriers, specially adapted for light emission in a repetitive configuration, e.g. LED bars two-dimensional arrays
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L33/00—Semiconductor devices having potential barriers specially adapted for light emission; Processes or apparatus specially adapted for the manufacture or treatment thereof or of parts thereof; Details thereof
- H01L33/48—Semiconductor devices having potential barriers specially adapted for light emission; Processes or apparatus specially adapted for the manufacture or treatment thereof or of parts thereof; Details thereof characterised by the semiconductor body packages
- H01L33/52—Encapsulations
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L2224/00—Indexing scheme for arrangements for connecting or disconnecting semiconductor or solid-state bodies and methods related thereto as covered by H01L24/00
- H01L2224/01—Means for bonding being attached to, or being formed on, the surface to be connected, e.g. chip-to-package, die-attach, "first-level" interconnects; Manufacturing methods related thereto
- H01L2224/42—Wire connectors; Manufacturing methods related thereto
- H01L2224/47—Structure, shape, material or disposition of the wire connectors after the connecting process
- H01L2224/48—Structure, shape, material or disposition of the wire connectors after the connecting process of an individual wire connector
- H01L2224/4805—Shape
- H01L2224/4809—Loop shape
- H01L2224/48091—Arched
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- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L2224/00—Indexing scheme for arrangements for connecting or disconnecting semiconductor or solid-state bodies and methods related thereto as covered by H01L24/00
- H01L2224/01—Means for bonding being attached to, or being formed on, the surface to be connected, e.g. chip-to-package, die-attach, "first-level" interconnects; Manufacturing methods related thereto
- H01L2224/42—Wire connectors; Manufacturing methods related thereto
- H01L2224/47—Structure, shape, material or disposition of the wire connectors after the connecting process
- H01L2224/48—Structure, shape, material or disposition of the wire connectors after the connecting process of an individual wire connector
- H01L2224/481—Disposition
- H01L2224/48135—Connecting between different semiconductor or solid-state bodies, i.e. chip-to-chip
- H01L2224/48137—Connecting between different semiconductor or solid-state bodies, i.e. chip-to-chip the bodies being arranged next to each other, e.g. on a common substrate
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L2933/00—Details relating to devices covered by the group H01L33/00 but not provided for in its subgroups
- H01L2933/0008—Processes
- H01L2933/0033—Processes relating to semiconductor body packages
- H01L2933/0041—Processes relating to semiconductor body packages relating to wavelength conversion elements
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L2933/00—Details relating to devices covered by the group H01L33/00 but not provided for in its subgroups
- H01L2933/0008—Processes
- H01L2933/0033—Processes relating to semiconductor body packages
- H01L2933/005—Processes relating to semiconductor body packages relating to encapsulations
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L33/00—Semiconductor devices having potential barriers specially adapted for light emission; Processes or apparatus specially adapted for the manufacture or treatment thereof or of parts thereof; Details thereof
- H01L33/48—Semiconductor devices having potential barriers specially adapted for light emission; Processes or apparatus specially adapted for the manufacture or treatment thereof or of parts thereof; Details thereof characterised by the semiconductor body packages
- H01L33/62—Arrangements for conducting electric current to or from the semiconductor body, e.g. lead-frames, wire-bonds or solder balls
Definitions
- the present invention relates to a light emitting device and a method for manufacturing the same.
- a COB (Chip On Board) light emitting device in which a light emitting element such as an LED (light emitting diode) element is mounted on a general-purpose substrate such as a ceramic substrate or a metal substrate is known.
- the LED element is sealed with a translucent resin containing a phosphor, and the light from the LED element and the light obtained by exciting the phosphor with the light from the LED element are mixed.
- white light or the like can be obtained depending on the application.
- Patent Document 1 includes an LED chip disposed on a support, and a phosphor that absorbs at least a part of light emitted from the LED chip and converts the wavelength to emit light, and other than on the LED chip and the LED chip.
- a light emitting diode is described having a coating formed on the substrate. This coating part is formed by dispersing the phosphor in the gas phase or liquid phase and precipitating the phosphor.
- the LED chip on the substrate is sealed with a translucent resin not containing a phosphor, and a resin layer containing the phosphor is formed with a uniform thickness on the LED chip.
- a light emitting device is described in which color unevenness is less likely to occur than in the case where a phosphor is dispersed in a light-sensitive resin.
- the present invention provides a light emitting device and a method for manufacturing the same, in which color unevenness is not conspicuous at the time of light emission even if the concentration of the phosphor precipitated in the resin encapsulating the plurality of light emitting elements varies between the light emitting elements.
- the purpose is to do.
- a substrate, a plurality of light emitting elements mounted on the substrate, and the plurality of light emitting elements are integrally sealed, and a first phosphor excited by light from the plurality of light emitting elements is disposed on a side far from the substrate.
- the concentration of the second phosphor in the second resin layer is lower than the concentration of the first phosphor at the lower end of the first resin layer, and the second fluorescence in the second resin layer.
- the body concentration is preferably higher than the concentration of the first phosphor at the upper end of the first resin layer.
- the upper end of the first resin layer is preferably a transparent resin layer not containing the first phosphor.
- the step of mounting the plurality of light emitting elements on the substrate and the plurality of light emitting elements are integrally sealed with an uncured resin containing a first phosphor excited by light from the plurality of light emitting elements.
- the concentration of the phosphor precipitated in the resin encapsulating the plurality of light emitting elements varies among the light emitting elements, the color unevenness is not conspicuous during light emission.
- FIG. 1 is a perspective view of a light emitting device 1.
- FIG. FIG. 2 is a cross-sectional view taken along line II-II in FIG. 3 is a perspective view for explaining the arrangement of a circuit board 20 and LED elements 30.
- FIG. FIG. 4 is a sectional view taken along line IV-IV in FIG. 3.
- (A) to (D) are diagrams showing examples of phosphor concentration distributions in the precipitated phosphor layer 50 and the dispersed phosphor layer 60.
- FIG. 4 is a flowchart illustrating an example of a manufacturing process of the light emitting device 1.
- 6 is a perspective view of another light emitting device 2.
- FIG. FIG. 8 is a sectional view taken along line VIII-VIII in FIG.
- FIG. 1 is a perspective view of the light emitting device 1.
- FIG. 2 is a cross-sectional view taken along the line II-II in FIG.
- the light emitting device 1 includes an LED element as a light emitting element, and is used as an LED light source device for various illuminations, for example.
- the light emitting device 1 includes a mounting substrate 10, a circuit substrate 20, an LED element 30, a resin frame 40, a precipitated phosphor layer 50, and a dispersed phosphor layer 60 as main components.
- the mounting substrate 10 has a square shape as an example, and is a metal substrate having a circular mounting region 11 (see FIG. 3 to be described later) on which the LED element 30 is mounted at the center of the upper surface thereof. Since the mounting substrate 10 also functions as a heat dissipation substrate that dissipates heat generated by the LED elements 30 and phosphor particles described later, the mounting substrate 10 is made of aluminum having excellent heat resistance and heat dissipation, for example. However, as long as the material of the mounting substrate 10 is excellent in heat resistance and heat dissipation, another metal such as copper may be used.
- FIG. 3 is a perspective view for explaining the arrangement of the circuit board 20 and the LED elements 30.
- 4 is a cross-sectional view taken along line IV-IV in FIG.
- the circuit board 20 has a square shape having the same size as the mounting board 10 and has a circular opening 21 at the center thereof.
- the lower surface of the circuit board 20 is fixed on the mounting board 10 by an adhesive sheet, for example.
- a wiring pattern 23A is formed on one side of the upper surface of the circuit board 20 and a wiring pattern 23B is formed on the other side so as to surround the opening 21.
- a connection electrode 24A is formed at one corner located diagonally on the upper surface of the circuit board 20, and a connection electrode 24B is formed at the other corner.
- One of the connection electrodes 24A and 24B serves as an anode electrode and the other serves as a cathode electrode.
- the LED element 30 is an example of a light emitting element, and is, for example, an LED element such as a gallium nitride compound semiconductor that emits light having a wavelength ranging from an ultraviolet region to a blue region.
- the LED element 30 is a blue LED that emits blue light having an emission wavelength band of about 450 to 460 nm, for example.
- the LED element 30 may be an element that emits light of other wavelengths such as violet light or ultraviolet light.
- a plurality of LED elements 30 are mounted in a grid pattern on the mounting region 11 of the mounting substrate 10 exposed in the opening 21 of the circuit board 20.
- FIG. 3 shows an example in which 21 LED elements 30 are mounted.
- the lower surface of the LED element 30 is fixed to the upper surface of the mounting substrate 10 with, for example, a transparent insulating adhesive.
- the LED element 30 has a pair of element electrodes on its upper surface. As shown in FIGS. 3 and 4, the element electrodes of the adjacent LED elements 30 are electrically connected to each other by bonding wires 31 (hereinafter simply referred to as wires 31). It is connected to the. A wire 31 coming out of the LED element 30 located on the outer peripheral side of the opening 21 is connected to the wiring pattern 23 ⁇ / b> A or the wiring pattern 23 ⁇ / b> B of the circuit board 20. Thereby, a current is supplied to each LED element 30 via the wire 31.
- the resin frame 40 is a circular frame made of, for example, white resin according to the size of the opening 21 of the circuit board 20, and is formed so as to border the opening 21 on the upper surface of the circuit board 20.
- the wiring patterns 23A and 23B are fixed to the overlapping positions.
- the resin frame 40 is a dam material for preventing the resin of the precipitated phosphor layer 50 and the dispersed phosphor layer 60 from flowing out. Further, the light emitted from the LED element 30 to the side is emitted from the light emitting device 1. The light is reflected upward (on the side opposite to the mounting substrate 10 when viewed from the LED element 30).
- the precipitated phosphor layer 50 is an example of a first resin layer, and is made of a translucent resin containing the phosphor 51 that is the first phosphor. As shown in FIG. 2, the precipitated phosphor layer 50 fills the space on the mounting substrate 10 surrounded by the resin frame 40 to a position higher than the upper end of the wire 31, and the plurality of LED elements 30 and wires 31 are filled. Are integrally covered and protected (sealed).
- a colorless and transparent thermosetting resin such as an epoxy resin or a silicone resin is used.
- the phosphor 51 is, for example, a yellow phosphor such as YAG (Yttrium Aluminum Garnet), and the particles are precipitated downward in the precipitation phosphor layer 50. That is, the concentration of the precipitated phosphor layer 50 increases as the phosphor 51 excited by light from the plurality of LED elements 30 moves from the upper end that is far from the mounting substrate 10 toward the lower end that is closer to the mounting substrate 10. Contains.
- the precipitation of the phosphor 51 particles in the precipitated phosphor layer 50 is represented by a shade pattern.
- the phosphor 51 is deposited not only on the upper surface of the mounting substrate 10 but also on the upper surface of the LED element 30.
- the light emitting device 1 emits white light obtained by mixing blue light from the LED element 30 and yellow light obtained by exciting the phosphor 51 in the precipitated phosphor layer 50 thereby.
- the LED element 30 is directly mounted on the mounting substrate 10 with high heat dissipation, and the phosphor 51 in the precipitated phosphor layer 50 is precipitated at a position close to the mounting substrate 10.
- the heat generated in 30 and the phosphor 51 easily escapes to the outside of the apparatus through the mounting substrate 10. Accordingly, it is possible to prevent a decrease in the light emission intensity of the LED element 30 due to heat, which is advantageous in improving the light emission intensity.
- the dispersed phosphor layer 60 is an example of a second resin layer, is made of a translucent resin containing the phosphor 61 that is the second phosphor, and is disposed on the precipitated phosphor layer 50. Yes.
- a colorless and transparent resin such as an epoxy resin or a silicone resin is used for the dispersed phosphor layer 60.
- the material of the dispersed phosphor layer 60 may be the same as or different from the precipitated phosphor layer 50. Good. Further, another transparent resin layer may be provided between the precipitated phosphor layer 50 and the dispersed phosphor layer 60.
- the phosphor 61 is, for example, the same yellow phosphor as the phosphor 51.
- the dispersed phosphor layer 60 contains a phosphor 61 that is excited by light from the plurality of LED elements 30 at a uniform concentration. That is, in the dispersed phosphor layer 60, unlike the phosphor 51 of the precipitated phosphor layer 50, the particles of the phosphor 61 are uniformly dispersed regardless of the positions in the horizontal direction and the vertical direction. Even in the dispersed phosphor layer 60, white light is generated by mixing the blue light from the LED element 30 and the yellow light obtained by exciting the phosphor 61 thereby.
- the dispersed phosphor layer 60 in which the phosphors 61 are uniformly dispersed is on the precipitated phosphor layer 50, the blue light from the precipitated phosphor layer 50 is dispersed in the dispersed phosphor layer 60. It passes through and is converted to white light. For this reason, even if there is a portion in which the concentration of the phosphor 51 in the precipitated phosphor layer 50 varies between the LED elements 30 and a large amount of blue light is emitted, such variation in light emission is caused by the emitted light being dispersed fluorescence. It is relaxed by passing through the body layer 60. Therefore, the presence of the dispersed phosphor layer 60 makes the color unevenness due to the variation in the phosphor concentration in the precipitated phosphor layer 50 inconspicuous.
- the precipitated phosphor layer 50 and the dispersed phosphor layer 60 may contain a plurality of types of phosphors such as a green phosphor and a red phosphor as the phosphors 51 and 61.
- the light emitting device 1 is obtained by mixing blue light from the LED element 30 that is a blue LED and green light and red light obtained by exciting the green phosphor and the red phosphor thereby. Emits light.
- the green phosphor is a particulate phosphor material such as (BaSr) 2 SiO 4 : Eu 2+ that absorbs blue light emitted from the LED element 30 and converts the wavelength into green light.
- the red phosphor is a particulate phosphor material such as CaAlSiN 3 : Eu 2+ that absorbs blue light emitted from the LED element 30 and converts the wavelength into red light.
- one or both of the precipitated phosphor layer 50 and the dispersed phosphor layer 60 may further contain, for example, a yellow phosphor in addition to a green phosphor and a red phosphor as the phosphors 51 and 61, or yellow Different combinations of phosphors such as phosphor and red phosphor may be included.
- FIG. 5 (A) to 5 (D) are diagrams showing examples of the concentration distribution of the phosphor in the precipitated phosphor layer 50 and the dispersed phosphor layer 60.
- the concentration distribution f (Z) of the phosphor in the height direction (Z direction) is shown in a graph.
- the dispersed phosphor layers 60 are the same, but the concentration distributions of the phosphors 51 in the precipitated phosphor layer 50 are different from each other.
- the relationship between the phosphor concentrations in the precipitated phosphor layer 50 and the dispersed phosphor layer 60 may be any of the four shown in FIGS. 5 (A) to 5 (D).
- the precipitated phosphor layer 50A includes a transparent resin layer 53 having a height Z 1 to Z 2 (Z 1 > Z 2 ) at the upper end and a height Z containing the phosphor 51.
- the phosphor concentration of the dispersed phosphor layer 60 is f 1
- the phosphor concentration of the transparent resin layer 53 is 0.
- the phosphor concentration of the intermediate concentration layer 52 is gradually increased from 0 as it approaches 0 from Z 2, rapidly increasing especially in the vicinity of the height 0, greater than f 1 in the vicinity of the lower end height It becomes f 2.
- the precipitated phosphor layer 50B contains the transparent resin layer 53 in the range of heights Z 1 to Z 2 at the upper end and the phosphor 51, as in the case of FIG. 5 (A). And an intermediate concentration layer 52 ′ in the range of the height Z 2 to 0. Phosphor concentration of the intermediate concentration layer 52 ', the height is increased in a straight line from 0 closer to the 0 to Z 2, to f 2 greater than the phosphor concentration f 1 of the dispersion fluorescent layer 60 in the vicinity of the lower end Become.
- the precipitated phosphor layer 50 ⁇ / b> C does not have a transparent resin layer except for a very small range at the upper end, and the entire precipitated phosphor layer 50 ⁇ / b> C contains the phosphor 51.
- the phosphor concentration of the precipitated phosphor layer 50C increases linearly from 0 as the height approaches Z 1 to 0, and reaches f 2 that is greater than the phosphor concentration f 1 of the dispersed phosphor layer 60 near the lower end. Become.
- the precipitated phosphor layer 50 ⁇ / b> D does not have any transparent resin layer, and the entire precipitated phosphor layer 50 ⁇ / b> D contains the phosphor 51.
- Phosphor concentration of the precipitate phosphor layer 50D is a small f 3 than the phosphor concentration f 1 of the dispersion fluorescent layer 60 in the upper end of the height Z 1, f 3 as the height approaches 0 from Z 1 Increases in a straight line to f 2 larger than f 1 in the vicinity of the lower end.
- the phosphor concentration f 1 of the dispersed phosphor layer 60 is higher than the phosphor concentration f 2 at the highest concentration in the precipitated phosphor layer 50. Low. That is, the concentration of the phosphor 61 in the dispersed phosphor layer 60 is preferably lower than the concentration of the phosphor 51 at the lower end of the precipitated phosphor layer 50. Since the dispersed phosphor layer 60 is an auxiliary material for alleviating the color unevenness caused by the variation in the phosphor concentration in the precipitated phosphor layer 50, the phosphor concentration of the dispersed phosphor layer 60 is determined by the dispersed phosphor.
- the phosphor concentration of the dispersed phosphor layer 60 is not too high.
- the phosphor concentration f 1 of the dispersed phosphor layer 60 is the phosphor concentration 0 or 0 at the lowest concentration in the precipitated phosphor layer 50. higher than f 3. That is, the concentration of the phosphor 61 in the dispersed phosphor layer 60 is preferably higher than the concentration of the phosphor 51 at the upper end of the precipitated phosphor layer 50 (just below the dispersed phosphor layer 60). Even if the phosphor concentration of the dispersed phosphor layer 60 is too low, the effect of alleviating color unevenness cannot be obtained.
- the upper end of the precipitated phosphor layer 50 (directly below the dispersed phosphor layer 60) is a transparent resin layer 53 that does not contain the phosphor 51. It is preferable.
- the phosphor concentration f 1 of the dispersed phosphor layer 60 is the fluorescence at the upper end of the precipitated phosphor layer 50 (just below the dispersed phosphor layer 60). Below the body density f 3, relaxation effect of color irregularity due to dispersion phosphor layer 60 is hardly obtained.
- the upper limit of the phosphor concentration of the dispersed phosphor layer 60 is determined by the relationship between the amount of temperature rise by the phosphor 61 of the dispersed phosphor layer 60 and the heat resistance temperature of the resin constituting the dispersed phosphor layer 60.
- the lower limit of the phosphor concentration of the dispersed phosphor layer 60 includes the degree of variation in the phosphor concentration in the precipitated phosphor layer 50, the degree of color unevenness mitigation by the dispersed phosphor layer 60, and the allowable range of color unevenness. It depends on the relationship. As the phosphor concentration of the dispersed phosphor layer 60 increases, the color unevenness becomes less noticeable. However, as described above, since the phosphor concentration has an upper limit, the amount of the phosphor 61 that is actually dispersed and mixed in the dispersed phosphor layer 60. Is determined experimentally.
- the concentration distribution of the phosphor 51 is different for each product. Therefore, the chromaticity of the emitted light depends on the degree of variation in the phosphor concentration in the precipitated phosphor layer 50. Also varies from product to product. However, if the phosphor concentration of the dispersed phosphor layer 60 is adjusted, the chromaticity difference for each product can be canceled and the chromaticity of the emitted light can be kept within an allowable range. For this reason, it is also possible to reduce the defective rate of the product by disposing the dispersed phosphor layer 60 on the precipitated phosphor layer 50.
- a diffused layer may be disposed in place of the dispersed phosphor layer if lightness unevenness is alleviated.
- the color unevenness does not disappear.
- the dispersed phosphor layer is used instead of the diffusion layer.
- FIG. 6 is a flowchart showing an example of a manufacturing process of the light emitting device 1.
- a plurality of LED elements 30 are mounted on the mounting region 11 of the mounting substrate 10 to which the circuit board 20 is bonded (S1). Then, the LED elements 30 are connected to each other by wires 31, and each LED element 30 is connected to the wiring patterns 23A and 23B via the wires 31 (S2). Next, the resin frame 40 is fixed on the circuit board 20 along the edge of the opening 21 (S3).
- FIG. 7 is a perspective view of another light emitting device 2.
- FIG. 8 is a cross-sectional view taken along line VIII-VIII in FIG.
- the light-emitting device 2 is different from the light-emitting device 1 in that the mounting substrate 10 and the circuit board 20 of the light-emitting device 1 are replaced with a ceramic substrate 20 ′.
- the ceramic substrate 20 ′ is a flat substrate on which the wiring pattern and the connection electrodes 24 ⁇ / b> A and 24 ⁇ / b> B are formed on the upper surface, and on which the LED element 30 is mounted. Even when the ceramic substrate 20 ′ having no opening is used, the same precipitated phosphor layer 50 and dispersed phosphor layer 60 as those of the light emitting device 1 may be used as shown in FIG. 8. Also in the light emitting device 2, as in the light emitting device 1, the presence of the dispersed phosphor layer 60 makes the color unevenness due to the variation in the phosphor concentration in the precipitated phosphor layer 50 inconspicuous.
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Abstract
Description
Claims (5)
- 基板と、
前記基板上に実装された複数の発光素子と、
前記複数の発光素子を一体的に封止し、前記複数の発光素子からの光により励起される第1の蛍光体を、前記基板から遠い側である上端から前記基板に近い側である下端に向かうほど高い濃度で含有する第1の樹脂層と、
前記第1の樹脂層よりも上に配置され、前記複数の発光素子からの光により励起される第2の蛍光体を一様な濃度で含有する第2の樹脂層と、
を有することを特徴とする発光装置。 - 前記第2の樹脂層における前記第2の蛍光体の濃度は、前記第1の樹脂層の前記下端における前記第1の蛍光体の濃度よりも低い、請求項1に記載の発光装置。
- 前記第2の樹脂層における前記第2の蛍光体の濃度は、前記第1の樹脂層の前記上端における前記第1の蛍光体の濃度よりも高い、請求項2に記載の発光装置。
- 前記第1の樹脂層の前記上端は、前記第1の蛍光体を含有しない透明樹脂層である、請求項3に記載の発光装置。
- 基板上に複数の発光素子を実装する工程と、
前記複数の発光素子からの光により励起される第1の蛍光体を含有する未硬化の樹脂で前記複数の発光素子を一体的に封止して、第1の樹脂層を形成する工程と、
前記第1の樹脂層を未硬化の状態に保ったままで、前記第1の蛍光体を前記基板側に沈殿させる工程と、
前記第1の樹脂層を硬化させる工程と、
前記複数の発光素子からの光により励起される第2の蛍光体を一様な濃度で含有する第2の樹脂層を前記第1の樹脂層よりも上に配置する工程と、
を有することを特徴とする発光装置の製造方法。
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CN201780003133.6A CN109075234B (zh) | 2016-02-02 | 2017-01-11 | 发光装置及其制造方法 |
DE112017000624.4T DE112017000624T5 (de) | 2016-02-02 | 2017-01-11 | Licht emittierende Vorrichtung und Verfahren zu deren Herstellung |
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