WO2011004928A1 - 발광 장치 - Google Patents
발광 장치 Download PDFInfo
- Publication number
- WO2011004928A1 WO2011004928A1 PCT/KR2009/003894 KR2009003894W WO2011004928A1 WO 2011004928 A1 WO2011004928 A1 WO 2011004928A1 KR 2009003894 W KR2009003894 W KR 2009003894W WO 2011004928 A1 WO2011004928 A1 WO 2011004928A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- light emitting
- reflective layer
- layer
- protective layer
- chip
- Prior art date
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Images
Classifications
-
- 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
- H01L33/58—Optical field-shaping elements
- H01L33/60—Reflective elements
-
- 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
- H01L2224/481—Disposition
- H01L2224/48151—Connecting between a semiconductor or solid-state body and an item not being a semiconductor or solid-state body, e.g. chip-to-substrate, chip-to-passive
- H01L2224/48221—Connecting between a semiconductor or solid-state body and an item not being a semiconductor or solid-state body, e.g. chip-to-substrate, chip-to-passive the body and the item being stacked
- H01L2224/48245—Connecting between a semiconductor or solid-state body and an item not being a semiconductor or solid-state body, e.g. chip-to-substrate, chip-to-passive the body and the item being stacked the item being metallic
- H01L2224/48247—Connecting between a semiconductor or solid-state body and an item not being a semiconductor or solid-state body, e.g. chip-to-substrate, chip-to-passive the body and the item being stacked the item being metallic connecting the wire to a bond pad of the item
-
- 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
- H01L2224/481—Disposition
- H01L2224/48151—Connecting between a semiconductor or solid-state body and an item not being a semiconductor or solid-state body, e.g. chip-to-substrate, chip-to-passive
- H01L2224/48221—Connecting between a semiconductor or solid-state body and an item not being a semiconductor or solid-state body, e.g. chip-to-substrate, chip-to-passive the body and the item being stacked
- H01L2224/48245—Connecting between a semiconductor or solid-state body and an item not being a semiconductor or solid-state body, e.g. chip-to-substrate, chip-to-passive the body and the item being stacked the item being metallic
- H01L2224/48257—Connecting between a semiconductor or solid-state body and an item not being a semiconductor or solid-state body, e.g. chip-to-substrate, chip-to-passive the body and the item being stacked the item being metallic connecting the wire to a die pad of the item
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L2924/00—Indexing scheme for arrangements or methods for connecting or disconnecting semiconductor or solid-state bodies as covered by H01L24/00
- H01L2924/15—Details of package parts other than the semiconductor or other solid state devices to be connected
- H01L2924/181—Encapsulation
-
- 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
-
- 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
- H01L33/64—Heat extraction or cooling elements
- H01L33/642—Heat extraction or cooling elements characterized by the shape
Definitions
- the present invention relates to a light emitting device, and more particularly to a light emitting device having a high reflectivity and high reliability.
- a light emitting diode In general, a light emitting diode (LED) is a kind of semiconductor device used to convert an electrical signal into light by using the characteristics of a compound semiconductor, and has high luminous efficiency, long life, and low power consumption.
- the technology field using light emitting diodes is increasing due to many advantages of being environmentally friendly.
- Such a light emitting diode is typically manufactured in a package structure in which a light emitting chip is mounted on a lead frame, and is configured to perform the light emitting operation of the light emitting chip in response to power applied from the outside through the lead frame.
- Conventional light emitting diodes mainly use a silver plated lead frame to increase reflectance, but the silver plated lead frame is vulnerable to moisture or heat, which causes problems such as deterioration of brightness and lifespan due to corrosion or discoloration when driving for a long time.
- the present invention has been made in view of such a problem, and the present invention provides a light emitting device resistant to corrosion while maintaining a high reflectance.
- a light emitting device includes a light emitting chip that generates light, a chip mounting portion on which the light emitting chip is mounted, a reflective layer formed on at least a portion of an outer circumferential surface of the chip mounting portion, and an inner surface of the reflective layer than the reflective layer.
- a protective layer is formed of a metal having excellent corrosiveness to prevent corrosion of the reflective layer.
- the reflective layer is formed of a metal having a reflectance of 70% or more.
- the reflective layer may include at least one selected from silver (Ag), platinum (Pt), and aluminum (Al).
- the protective layer is formed of a metal having an extinction coefficient of 4.0 or less.
- the protective layer may include at least one selected from gold (Au), nickel (Ni), titanium (Ti), tungsten (W), and molybdenum (Mo).
- Au gold
- Ni nickel
- Ti titanium
- Mo molybdenum
- the protective layer is formed to a thickness of 0.1nm ⁇ 200nm.
- the chip mounting unit may include at least one selected from a lead frame, a slug, a printed circuit board, a ceramic substrate, and a CNT substrate.
- the light emitting device may further include a housing in which the chip mounting part is fixed and an opening for exposing the light emitting chip is formed, and a reflector formed on an inner surface of the opening of the housing. At this time, the reflective layer is formed on the surface of the reflector.
- a lead frame according to an aspect of the present invention is formed of a base conductive layer, a reflective layer formed on at least a portion of the outer circumferential surface of the base conductive layer, and a metal having better corrosion resistance than the reflective layer on the outer circumferential surface of the reflective layer to prevent corrosion of the reflective layer. It includes a protective layer to prevent.
- the reflective layer is formed of a metal having a reflectance of 70% or more.
- the reflective layer may include at least one selected from silver (Ag), platinum (Pt), and aluminum (Al).
- the protective layer is formed of a metal having an extinction coefficient of 4.0 or less.
- the protective layer may include at least one selected from gold (Au), nickel (Ni), titanium (Ti), tungsten (W), and molybdenum (Mo). When the protective layer is formed of gold, the protective layer is formed to a thickness of 0.1nm ⁇ 200nm.
- the light emitting device may further include a nickel layer formed between the base conductive layer and the reflective layer
- a reflective layer having a high reflectance is formed on at least a portion of a chip mounting portion such as a lead frame, a slug, a printed circuit board, a ceramic substrate, and a CNT substrate on which a light emitting chip may be mounted, and is a material vulnerable to corrosion.
- a metal resistant to corrosion on the outer circumferential surface of the formed reflective layer in a thin film, defects such as corrosion and discoloration can be suppressed while maintaining the reflectance of the chip mounting portion at a predetermined level or more.
- FIG. 1 is a plan view illustrating a light emitting device according to an exemplary embodiment of the present invention.
- FIG. 2 is a cross-sectional view taken along the line II ′ of FIG. 1.
- FIG. 3 is an enlarged view specifically showing the lead frame shown in FIG. 2.
- FIG. 4 is a graph illustrating light efficiency of a light emitting device package according to a change in thickness of a reflective layer formed of gold.
- 5 is a graph showing the light transmittance according to the thickness of the protective layer formed of nickel or titanium.
- FIG. 6 is a view showing a lead frame according to another embodiment of the present invention.
- FIG. 7 is a cross-sectional view illustrating a light emitting device according to another embodiment of the present invention.
- FIG. 8 is a cross-sectional view illustrating a light emitting device according to still another embodiment of the present invention.
- FIG. 9 is a cross-sectional view illustrating a light emitting device according to still another embodiment of the present invention.
- the terms “comprise” or “having” are intended to indicate that there is a feature, number, step, operation, component, part, or combination thereof described in the specification, and that one or more other features It should be understood that it does not exclude in advance the possibility of the presence or addition of numbers, steps, operations, components, parts or combinations thereof.
- Terms such as first and second may be used to describe various components, but the components should not be limited by the terms. The terms are used only for the purpose of distinguishing one component from another. For example, without departing from the scope of the present invention, the first component may be referred to as the second component, and similarly, the second component may also be referred to as the first component.
- the light emitting device is more excellent in corrosion resistance than the reflective layer on a light emitting chip for generating light, a chip mounting portion on which the light emitting chip is mounted, a reflective layer formed on at least a portion of an outer peripheral surface of the chip mounting portion, and an outer peripheral surface of the reflective layer.
- a protective layer is formed of a metal to prevent corrosion of the reflective layer.
- the chip mounting unit may be formed of various configurations for mounting the light emitting chip, and may include, for example, a lead frame, a slug, a printed circuit board, a ceramic substrate, a CNT substrate, or the like.
- FIG. 1 is a plan view illustrating a light emitting device according to an exemplary embodiment of the present invention
- FIG. 2 is a cross-sectional view taken along line II ′ of FIG. 1
- FIG. 3 specifically illustrates the lead frame illustrated in FIG. 2. It is an enlarged view.
- the light emitting device 100 includes a light emitting chip 110 and a chip mounting unit 120 on which the light emitting chip 110 is mounted.
- the light emitting device 100 may include a housing 130 for fixing the chip mounting unit 120, first and second conductive wires 140 for electrically connecting the light emitting chip 110 and the chip mounting unit 120.
- 150 may further include an encapsulant 160 filled in the opening 132 of the housing 130.
- the chip mounting unit 120 in which the light emitting chip 110 is mounted is configured as a lead frame for applying power to the light emitting chip 110.
- the same reference numerals as those of the chip mounting unit 120 are attached to the lead frame.
- the lead frame 120 supports the light emitting chip 110, and receives power from the outside to supply the light emitting chip 110 to the light emitting chip 110.
- the lead frame 120 may include a first lead terminal 122 and a second lead terminal 124 spaced apart at predetermined intervals and electrically separated from each other.
- the light emitting chip 110 is mounted on, for example, the first lead terminal 122.
- the first lead terminal 122 is electrically connected to the light emitting chip 110 through the first conductive wire 140, and the second lead terminal 124 is electrically connected to the light emitting chip 110 through the second conductive wire 150. And can be electrically connected. Meanwhile, the first lead terminal 122 may be electrically connected to the lower surface of the light emitting chip 110 through the conductive adhesive. Portions of the first lead terminal 122 and the second lead terminal 124 are exposed to the outside of the housing 130 for electrical connection with an external circuit board.
- the lead frame 120 is formed on the base conductive layer 120a, the reflective layer 120b formed on at least a portion of the outer circumferential surface of the base conductive layer 120a, and the outer circumferential surface of the reflective layer 120b. And a protective layer 120c for preventing corrosion of the reflective layer 120b.
- the base conductive layer 120a is formed of a metal having excellent electrical conductivity and workability.
- the base conductive layer 120a may be formed of copper (Cu) or a copper alloy in which zinc (Zn) or iron (Fe) is mixed with copper.
- the base conductive layer 120a is formed to have a thickness of, for example, about 0.1 to 1.0 mm.
- the base conductive layer 120a may be formed of a material such as carbon nanotube (CNT) having excellent electrical conductivity.
- CNT carbon nanotube
- the reflective layer 120b is formed of a material having high reflectance on the surface of the base conductive layer 120a in order to increase the reflectance of the lead frame 120. In order for the reflective layer 120b to function as a unique mirror, the reflectance must be at least 70% or more. Accordingly, referring to Table 1 below, the reflective layer 120b may be formed of a material such as silver (Ag), aluminum (Al), platinum (Pt), or the like. Preferably, the reflective layer 120b is preferably formed of a metal having higher electrical conductivity and reflectance than the base conductive layer 120a. Accordingly, the reflective layer 120b is most preferably formed of silver (Ag).
- the reflective layer 120b may be formed on the outer circumferential surface of the base conductive layer 120a through a plating method. If the thickness of the reflective layer 120b is too thin, the color of the metal material does not appear, and the efficiency of reflecting light is low. If the thickness is too thick, the use of the material is increased and the cost is increased without further reflectivity. have. Therefore, the thickness range of the reflective layer 120b is formed in a range capable of minimizing the cost while maintaining the reflectivity of the reflective layer 120b in the best condition. For example, the reflective layer 120b is formed to a thickness of about 1 ⁇ 50 ⁇ m for improving the reflectance and cost reduction.
- the protective layer 120c is formed on the surface of the reflective layer 120b to prevent corrosion of the lead frame 120.
- the reflective layer 120b formed of silver (Ag), aluminum (Al), platinum (Pt), or the like on the outer circumferential surface of the base conductive layer 120a has a high reflectance but is weak to high temperature and high humidity, and thus may be corroded and discolored. And a protective layer 120c on the outer circumferential surface of the reflective layer 120b to prevent discoloration.
- the protective layer 120c is formed of a metal having better corrosion resistance than the reflective layer 120b in order to prevent or suppress corrosion of the reflective layer 120b.
- the excellent corrosion resistance means that the energy required for the metal to be oxidized is high, and the diffusion prevention function for preventing the rapid propagation of oxygen atoms is excellent.
- Representative metals having excellent anti-diffusion capabilities include gold (Au), nickel (Ni), titanium (Ti), tungsten (W), molybdenum (Mo), and vanadium (V). It effectively blocks the diffusion of water and other contaminants even at its thickness.
- the protective layer 120c is preferably formed of a metal having a thickness thinner than the reflective layer 120b and having a low extinction coefficient.
- the extinction coefficient is a coefficient indicating how quickly the light intensity decreases in the depth direction when light is incident on the metal. The lower the extinction coefficient of the protective layer 120c is, the more likely the light is transmitted in the depth direction of the protective layer 120c. As a result, the decrease in reflectance of the reflective layer 120b is lowered.
- Table 2 shows the extinction coefficients of the metal materials.
- examples of metals having low extinction coefficients include gold (Au), nickel (Ni), tungsten (W), and molybdenum (Mo), all of which have an extinction of 4.0 or less at all wavelengths of visible light. Has a coefficient.
- Metals satisfying these two conditions include gold (Au) and nickel (Ni). , Titanium (Ti), tungsten (W), molybdenum (Mo) and the like.
- the protective layer 120c may be formed through a plating process.
- electroless plating is performed by directly electroplating a solution that provides metal ions, or by appropriately mixing a reducing agent such as dimethylamine borane (DMAB) or an EDTA standard solution and a corrosion inhibitor with an electrolytic solution that provides metal ions. Can be carried out to obtain a metal film.
- DMAB dimethylamine borane
- the protective layer 120c may be formed through sputtering.
- the reflective layer 120b of the lead frame 120 is formed of silver (Ag) having the highest reflectance
- the protective layer 120c is made of gold (Au) having high corrosion resistance and low plasticity coefficient even at a thin thickness. Is formed.
- the protective layer 120c As the thickness of the protective layer 120c is too thick, the function of protecting the reflective layer 120b from chemical attack becomes stronger, but the brightness of the light emitting device 100 is lowered. As the thickness of the protective layer 120c is thinner, the brightness increases. Manufacturing is not easy and the function as a protective film may be weakened. Therefore, the protective layer 120c needs to be selected with an appropriate optimum thickness capable of simultaneously serving as a high reflectance and an antioxidant film.
- FIG. 4 is a graph showing light efficiency of a light emitting device package according to a change in thickness of a protective layer formed of gold.
- the y-axis package light efficiency is formed of gold on the reflective layer formed of silver, assuming that the light efficiency of the package using a lead frame that does not form a protective layer formed of gold on the reflective layer formed of silver is 100%.
- the light efficiency ratio of the package using the lead frame in which the protective layer was formed is shown.
- the thickness of the reflective layer is fixed at 3 mu m.
- the gold protective layer 120c formed on the reflective layer 120b can be formed at about 0.1 nm or more, which is the minimum thickness that can prevent corrosion of the reflective layer 120b, and maintain the light efficiency at about 85% or more.
- a thickness of about 200 nm or less which is the maximum thickness, the corrosion of the reflective layer 120b can be prevented and the package light efficiency of the light emitting device 100 can be maintained at about 85% or more.
- 5 is a graph showing the light transmittance according to the thickness of the protective layer formed of nickel or titanium.
- the thickness of the nickel (Ni) or titanium (Ti) used as the protective layer 120c increases, the light transmittance can be seen to decrease, but the light transmittance of about 10% or more can be obtained even at a thickness of about 20 nm.
- the reflectance of the lead frame 120 decreases while the function of the protective film is improved. Accordingly, the light efficiency can be improved as compared with the decrease in reflectance due to corrosion and discoloration of the reflective layer 120b.
- the protective layer 120c of nickel (Ni) or titanium (Ti) formed on the reflective layer 120b is formed to about 0.1 nm or more, which is the minimum thickness that can prevent corrosion of the reflective layer 120b, and the light
- a thickness of about 20 nm or less which is the maximum thickness that can maintain the transmittance above a certain level, it is possible to prevent corrosion of the reflective layer 120b and at the same time reduce the light reflectance of the lead frame 120.
- the thickness of the protective layer 120c of nickel (Ni) or titanium (Ti) to 2 nm or less so that the light transmittance is 70% or more, the decrease in light reflectance can be minimized.
- the reflective layer 120b and the protective layer 120c may be formed on both surfaces of the lead frame 120 as a whole, or may be formed on only one surface on which the light emitting chip 110 is mounted, or light generated from the light emitting chip 110. It may be formed only in some regions which are directly reflected.
- FIG. 6 is a view showing a lead frame according to another embodiment of the present invention.
- the remaining components are the same as those shown in FIG. 3, and the same reference numerals are used for the same components, and detailed description thereof will be omitted.
- the lead frame 120 may further include a nickel layer 120d formed between the base conductive layer 120a and the reflective layer 120b. Since the reflective layer 120b formed of silver (Ag) may not be plated well on the base conductive layer 120a formed of copper (Cu) or the like, nickel (Ni) may be plated on the base conductive layer 120a first. After the formation of the layer 120d, the silver layer Ag is plated on the nickel layer 120d to easily form the reflective layer 120b.
- the light emitting chip 110 is mounted on the lead frame 120 and generates light in response to a power applied through the lead frame 120.
- the light emitting chip 110 is mounted on the first lead terminal 122, and the first lead terminal 122 and the second lead terminal through the first conductive wire 140 and the second conductive wire 150. And electrically connected to 124, respectively.
- the light emitting chip 110 may be made of a semiconductor material such as, for example, gallium nitride, arsenic nitride, phosphorus nitride, or the like.
- the light emitting chip 110 may generate light of various wavelength bands according to its use. For example, the light emitting chip 110 may generate light in a blue, red, yellow, or ultraviolet wavelength band.
- the housing 130 is coupled to the lead frame 120 to fix the lead frame 120. That is, the housing 130 is formed to surround at least a portion of the first lead terminal 122 and the second lead terminal 124 to fix the first lead terminal 122 and the second lead terminal 124.
- the housing 130 may be formed of, for example, polyphthalamide (PPA) resin.
- An opening 132 is formed in the housing 130 to expose a light emitting chip 110 and a portion of the lead frame 120 on which the light emitting chip 110 is mounted.
- the opening 132 may be formed in a funnel shape in which the opening area becomes wider from the inner side adjacent to the lead frame 120 toward the outer side. Accordingly, the inner surface of the housing 130 in which the opening 132 is formed may be formed as an inclined surface inclined at a predetermined angle, and a reflective material may be formed on the inner surface.
- the encapsulant 160 is filled in the opening 132 of the housing 130 to cover the light emitting chip 110.
- the encapsulant 160 is for protecting the light emitting chip 110 from the outside, and is formed of, for example, a transparent epoxy or silicone resin.
- a phosphor 162 for converting a wavelength of light generated from the light emitting chip 110 may be formed.
- the encapsulant 160 may include any one or more of red, green, and blue phosphors to implement light of a desired color such as white light.
- the light emitting device 100 may implement white light through a combination of the light emitting chip 110 and the phosphor 162.
- the light emitting chip 110 may be formed of a blue chip that generates blue light
- the phosphor 162 may be formed of a yellow phosphor that converts at least a portion of the blue light generated from the blue chip into yellow light.
- the blue light generates blue light having a maximum emission wavelength of about 430 nm to 470 nm, and is formed of, for example, an InGaN-based light emitting device chip.
- the yellow phosphor is excited by a portion of the blue light generated in the blue chip to emit yellow light.
- the yellow phosphor may include, for example, Yttrium Aluminum Garnet (Y 3 Al 5 O 12 ; hereinafter referred to as 'YAG'), silicate, or TAG-based fluorescent material. Accordingly, the light emitting device 100 emits white light by mixing blue light emitted from the blue chip and yellow light emitted from the yellow phosphor.
- the light emitting chip 110 is formed of a blue chip for generating blue light
- the phosphor 162 is a red phosphor for converting at least a portion of the blue light generated from the blue chip into red light and green light, respectively; Green phosphor.
- the red phosphor may be formed of, for example, an inorganic compound or a solid solution having a crystal structure similar to SrS: Eu, (Sr, Ca) S: Eu, CaS: Eu, (Sr, Ca) GeS: Eu, and CaAlSiN 3. Can be.
- the green phosphor may be formed of, for example, SrGa 2 S 4 : Eu and (Ba, Sr, Ca) 2 SiO 4 : Eu.
- the light emitting device 100 emits white light by mixing blue light emitted from the blue chip, red light emitted from the red phosphor, and green light emitted from the green phosphor.
- white light is implemented using the light emitting chip 110 made of the blue chip, the red phosphor, and the green phosphor, up to 20% of the light emitting device using the blue chip and the yellow phosphor having color reproducibility of about 85 or less is used. An improved color reproducibility of about 90 to 110 can be obtained.
- the light emitting device 100 may include two light emitting chips 110 and one kind of phosphor 162 for generating light of different colors.
- the light emitting chip 110 may include a blue chip for generating blue light and a red chip for generating red light
- the phosphor 162 may include at least one of blue light and red light generated from the blue chip and the red chip. It may include a green phosphor for converting a part to green light.
- the light emitting chip 110 may include a blue chip for generating blue light and a green chip for generating green light
- the phosphor 162 may include at least a portion of the blue light and the green light generated from the blue chip and the green chip. It may include a red phosphor for converting to red light.
- the lead frame 120 including the protective layer 120c formed of gold (Au) or the like having excellent corrosion resistance on the reflective layer 120b formed of a material such as silver (Ag) having a high reflectance. It is possible to suppress defects such as corrosion and discoloration while maintaining the reflectance of 120 or above.
- the lead frame 120 according to the present invention may be applied to various models such as a top view package, a side view package, a lamp package, and a chip package.
- FIG. 7 is a cross-sectional view illustrating a light emitting device according to another embodiment of the present invention.
- the reflector is the same as that shown in FIG. 2 except that the reflector is added, the same reference numerals will be used for the same components, and detailed description thereof will be omitted.
- the light emitting device further includes a reflector 170 formed on an inner surface of the opening 132 of the housing 130.
- the reflector 170 reflects the light generated from the light emitting chip 110 to the outside to improve the light emission efficiency of the light emitting device.
- the reflector 170 is formed of a metal having high light reflectivity, and thus, similar to that formed on the lead frame 120, the reflector 170 is made of a metal having excellent internal resistance. ) Is formed.
- FIG. 8 is a cross-sectional view illustrating a light emitting device according to still another embodiment of the present invention.
- the light emitting device 200 supplies power to the light emitting chip 210, the chip mounting unit 220 on which the light emitting chip 210 is mounted, and the light emitting chip 110.
- the light emitting device 200 may include an encapsulant formed to cover the first and second conductive wires 250 and 260 and the light emitting chip 210 to electrically connect the light emitting chip 210 and the lead frame 230. 270) may be further included.
- the chip mounting unit 220 on which the light emitting chip 210 is mounted is composed of slugs for dissipating heat generated from the light emitting chip 210.
- the same reference numerals as those of the chip mounting unit 220 are attached to the slug.
- the other components except for the slug 220 has a configuration similar to that shown in Figures 1 and 2, a detailed description thereof will be omitted.
- Slug 220 is disposed inside the center of the housing 240, the upper portion of the light emitting chip 210 is mounted, the lower portion is exposed to the outside of the housing 240 to increase the heat dissipation efficiency.
- the slug 220 is formed on the outer circumferential surfaces of the base conductive layer 120a and the base conductive layer 120a in the same manner as the lead frame 120 shown in FIG. 3 in order to prevent corrosion and discoloration while maintaining high reflectance.
- a protective layer 120c formed on the outer circumferential surface of the reflective layer 120b and a metal having better corrosion resistance than the reflective layer 120b.
- the reflective layer 120b may be formed of a material such as silver (Ag), aluminum (Al), or platinum (Pt)
- the protective layer 120c may be formed of gold (Au), nickel (Ni), or titanium ( Ti), tungsten (W), molybdenum (Mo), or the like.
- the actual configuration of the slug 220 except for the shape is the same as that of the lead frame 120 illustrated in FIG. 3, detailed description thereof will be omitted.
- FIG. 9 is a cross-sectional view illustrating a light emitting device according to still another embodiment of the present invention.
- a light emitting device 300 includes a light emitting chip 310, a substrate 320 corresponding to a chip mounting unit on which the light emitting chip 310 is mounted, and a substrate 320. It includes a reflective layer 330 formed on at least a portion of the outer peripheral surface of the protective layer 340 formed on the outer peripheral surface of the reflective layer 330.
- the light emitting device 300 includes at least one lead terminal 350 for applying power to the light emitting chip 310, and at least one conductive wire for electrically connecting the lead terminal 350 and the light emitting chip 310.
- an encapsulant 370 formed to cover the light emitting chip 310 and at least the conductive wire 360.
- the substrate 320 is for supporting the light emitting chip 310 and applying power to the light emitting chip 310.
- Various substrates such as a printed circuit board, a ceramic substrate, and a carbon nanotube (CNT) substrate may be used.
- a reflective layer 330 for reflecting light generated from the light emitting chip 310 and a protective layer 340 for preventing corrosion of the reflective layer 330 are formed in at least a portion of the substrate 320. Since the material of the reflective layer 330 and the protective layer 340 has been described above with reference to FIG. 3, it will be omitted.
- the reflective layer 330 and the protective layer 340 may be connected to at least one lead terminal 350 to serve as a lead terminal for applying power to the light emitting chip 310.
- a reflective layer having a high reflectance is formed on at least a portion of a chip mounting portion such as a lead frame, slug, printed circuit board, ceramic substrate, CNT substrate, etc. on which the light emitting chip may be mounted, and the corrosion of the reflective layer is prevented on the reflective layer.
- a chip mounting portion such as a lead frame, slug, printed circuit board, ceramic substrate, CNT substrate, etc. on which the light emitting chip may be mounted
- the corrosion of the reflective layer is prevented on the reflective layer.
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- Engineering & Computer Science (AREA)
- Microelectronics & Electronic Packaging (AREA)
- Manufacturing & Machinery (AREA)
- Computer Hardware Design (AREA)
- Power Engineering (AREA)
- Led Device Packages (AREA)
Abstract
Description
금속 | Ag | Al | Pt | W | Mo |
반사율(%) | 97 | 73 | 73 | 62 | 58 |
λ(㎚) | Au | Ni | W | Mo | Pd | Pb |
0.4592 | - | 2.71 | 2.55 | 3.51 | 3.26 | ∞ |
0.4769 | 1.796 | 2.81 | 2.59 | 3.61 | 3.39 | ∞ |
0.4959 | 1.84 | 2.93 | 2.68 | 3.73 | 3.54 | ∞ |
0.5166 | 2.12 | 3.06 | 2.72 | 3.78 | 3.68 | ∞ |
0.5391 | 2.54 | 3.19 | 2.72 | 3.61 | 3.84 | ∞ |
0.5636 | 2.88 | 3.33 | 2.75 | - | 4.02 | ∞ |
Claims (15)
- 광을 발생시키는 발광 칩;상기 발광 칩이 실장되는 칩실장부;상기 칩실장부의 외주면의 적어도 일부 영역에 형성된 반사층; 및상기 반사층의 외주면 상에 상기 반사층보다 내부식성이 우수한 금속으로 형성되어 상기 반사층의 부식을 방지하는 보호층을 포함하는 발광 장치.
- 제1항에 있어서,상기 반사층은 반사율이 70% 이상인 금속으로 형성된 것을 특징으로 하는 발광 장치.
- 제2항에 있어서,상기 반사층은 은(Ag), 백금(Pt) 및 알루미늄(Al) 중에서 선택된 적어도 하나를 포함하는 것을 특징으로 하는 발광 장치.
- 제1항에 있어서,상기 보호층은 소광 계수가 4.0 이하인 금속으로 형성된 것을 특징으로 하는 발광 장치.
- 제4항에 있어서,상기 보호층은 금(Au), 니켈(Ni), 티타늄(Ti), 텅스텐(W) 및 몰리브덴(Mo) 중에서 선택된 적어도 하나를 포함하는 것을 특징으로 하는 발광 장치.
- 제5항에 있어서,상기 보호층이 금으로 형성된 경우, 상기 보호층은 0.1㎚ ~ 200㎚의 두께를 갖는 것을 특징으로 하는 발광 장치.
- 제1항에 있어서,상기 칩실장부는 리드 프레임, 슬러그, 인쇄회로기판, 세라믹 기판, CNT 기판 중에서 선택된 적어도 하나를 포함하는 것을 특징으로 하는 발광 장치.
- 제1항에 있어서,상기 칩실장부를 고정하며, 상기 발광칩을 노출시키기 위한 개구부가 형성된 하우징; 및상기 하우징의 개구부 내면에 형성된 리플렉터를 포함하며,상기 리플렉터의 표면에도 상기 반사층이 형성된 것을 특징으로 하는 발광 장치.
- 베이스 도전층;상기 베이스 도전층의 외주면 상의 적어도 일부 영역에 형성된 반사층; 및상기 반사층의 외주면 상에 상기 반사층보다 내부식성이 우수한 금속으로 형성되어 상기 반사층의 부식을 방지하는 보호층을 포함하는 리드 프레임.
- 제9항에 있어서,상기 반사층은 반사율이 70% 이상인 금속으로 형성된 것을 특징으로 하는 리드 프레임.
- 제10항에 있어서,상기 반사층은 은(Ag), 백금(Pt) 및 알루미늄(Al) 중에서 선택된 적어도 하나를 포함하는 것을 특징으로 하는 리드 프레임.
- 제9항에 있어서,상기 보호층은 소광 계수가 4.0 이하인 금속으로 형성된 것을 특징으로 하는 리드 프레임.
- 제12항에 있어서,상기 보호층은 금(Au), 니켈(Ni), 티타늄(Ti), 텅스텐(W) 및 몰리브덴(Mo) 중에서 선택된 적어도 하나를 포함하는 것을 특징으로 하는 리드 프레임.
- 제13항에 있어서,상기 보호층이 금으로 형성된 경우, 상기 보호층은 0.1㎚ ~ 200㎚의 두께를 갖는 것을 특징으로 하는 리드 프레임.
- 제9항에 있어서,상기 베이스 도전층과 상기 반사층 사이에 형성된 니켈층을 더 포함하는 것을 특징으로 하는 리드 프레임.
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KR101892917B1 (ko) * | 2011-06-27 | 2018-08-29 | 엘지이노텍 주식회사 | 발광소자 패키지 |
KR101440514B1 (ko) * | 2012-08-24 | 2014-09-17 | 시스테크 주식회사 | Led 조명등 기구 |
CN106549091A (zh) * | 2016-07-31 | 2017-03-29 | 深圳市微纳科学技术有限公司 | 内设光反射层、用于led封装的陶瓷印刷电路板及方法 |
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KR20010020677A (ko) * | 1999-08-25 | 2001-03-15 | 다카노 야스아키 | 혼성 집적 회로 장치 |
WO2004064154A1 (en) * | 2003-01-16 | 2004-07-29 | Matsushita Electric Industrial Co., Ltd. | Lead frame for a semiconductor device |
US20040256632A1 (en) * | 2003-02-26 | 2004-12-23 | Osram Opto Semiconductors Gmbh | Electrical contact for optoelectronic semiconductor chip and method for its production |
JP2007067116A (ja) * | 2005-08-30 | 2007-03-15 | Toshiba Lighting & Technology Corp | 発光装置 |
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- 2009-07-15 WO PCT/KR2009/003894 patent/WO2011004928A1/ko active Application Filing
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KR20010020677A (ko) * | 1999-08-25 | 2001-03-15 | 다카노 야스아키 | 혼성 집적 회로 장치 |
WO2004064154A1 (en) * | 2003-01-16 | 2004-07-29 | Matsushita Electric Industrial Co., Ltd. | Lead frame for a semiconductor device |
US20040256632A1 (en) * | 2003-02-26 | 2004-12-23 | Osram Opto Semiconductors Gmbh | Electrical contact for optoelectronic semiconductor chip and method for its production |
JP2007067116A (ja) * | 2005-08-30 | 2007-03-15 | Toshiba Lighting & Technology Corp | 発光装置 |
Cited By (3)
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CN110249437A (zh) * | 2018-01-10 | 2019-09-17 | 首尔半导体株式会社 | 发光装置 |
US11908984B2 (en) | 2018-01-10 | 2024-02-20 | Seoul Semiconductor Co., Ltd. | Light emitting device having a reflective member |
CN110249437B (zh) * | 2018-01-10 | 2024-06-21 | 首尔半导体株式会社 | 发光装置 |
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CN102473823A (zh) | 2012-05-23 |
KR101081920B1 (ko) | 2011-11-10 |
KR20110004066A (ko) | 2011-01-13 |
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