Method of manufacturing semiconductor light emitting device

A method of manufacturing a semiconductor light emitting device includes forming a light emitting structure layer including an active layer on a first substrate. A second substrate is bonded to the light emitting structure layer at a first temperature higher than room temperature. The first substrate is removed from the light emitting structure layer at a second temperature higher than room temperature. The second substrate and the light emitting structure are cooled to reach room temperature. A coefficient of thermal expansion of the second substrate is different from a coefficient of thermal expansion of the active layer.

CROSS-REFERENCE TO RELATED APPLICATION

This application claims benefit of priority to Korean Patent Application No. 10-2014-0007116, filed on Jan. 21, 2014, with the Korean Intellectual Property Office, the entire content of which is incorporated herein by reference.

TECHNICAL FIELD

The present disclosure relates to a method of manufacturing a semiconductor light emitting device.

BACKGROUND

In general, in manufacturing a nitride semiconductor light emitting device, a light emitting structure layer is formed on a sapphire substrate, and here, a sapphire substrate is an electrical insulator having poor thermal conductivity, limiting manufacturing capabilities in terms of high output, high luminance light emitting devices. For this reason, after a light emitting structure layer is formed on a growth substrate such as a sapphire substrate, a support substrate may be bonded thereto and the growth substrate may be removed. In this case, in order to remove the growth substrate, a laser lift-off or a chemical lift-off process is commonly used.

Meanwhile, when a light emitting structure layer of a semiconductor lighting device is formed on a growth substrate, stress is induced in the growth substrate and the light emitting structure layer due to differences in lattice constants and coefficients of thermal expansion between the light emitting structure layer and the growth substrate, affecting luminous efficiency of the semiconductor lighting device.

SUMMARY

An aspect of the present disclosure may provide a method of manufacturing a semiconductor light emitting device capable of enhancing luminous efficiency.

However, the object of the present disclosure is not limited thereto and the object and effects that may be recognized from technical solutions or embodiments described hereinafter may also be included while not explicitly mentioned.

One aspect of the present disclosure relates to a method of manufacturing a semiconductor light emitting device, including forming a light emitting structure layer including an active layer on a first substrate. A second substrate is bonded to the light emitting structure layer at a first temperature higher than room temperature. The first substrate is removed from the light emitting structure layer at a second temperature higher than room temperature. The second substrate and the light emitting structure are cooled to reach room temperature. A coefficient of thermal expansion of the second substrate is different from a coefficient of thermal expansion of the active layer.

In the forming of the light emitting structure layer, compressive or tensile stress may be induced in the active layer, and the compressive or tensile stress induced in the active layer may be relieved while the light emitting structure layer is cooled to reach room temperature.

The active layer may have compressive stress, and the coefficient of thermal expansion of the second substrate may be lower than the coefficient of thermal expansion of the active layer.

The second substrate may be any one material selected from the group consisting of Si, SiC, AlN, GaP, InP, and graphite.

The first substrate may be a sapphire substrate, and the light emitting structure layer including the active layer may include a Group III-V nitride semiconductive material.

The active layer may have tensile stress, and the coefficient of thermal expansion of the second substrate may be greater than the coefficient of thermal expansion of the active layer.

The second temperature may be lower than or equal to the first temperature.

A difference in coefficients of thermal expansion between the active layer and the second substrate may be within a range of 0.5×10−6/K to 3.0×10−6/K.

The bonding of the second substrate to the light emitting structure layer may be performed by eutectic bonding of a bonding metal.

The bonding metal may be a gold alloy having a eutectic temperature of 200° C. or higher.

The removing of the first substrate may be performed by laser lift-off (LLO).

A thickness of the second substrate may be greater than a thickness of the light emitting structure layer.

The method may further include forming an electrode on a surface of the light emitting structure layer from which the first substrate has been removed.

Another aspect of the present disclosure relates to a method of manufacturing a semiconductor light emitting device package, including manufacturing a semiconductor light emitting device according to the above-noted method of manufacturing a semiconductor light emitting device. The semiconductor light emitting device is mounted on one of a pair of lead frames. The semiconductor light emitting device is electrically connected to the other of the lead frames through a wire and to the one of the lead frames through the second substrate of the semiconductor light emitting device.

Still another aspect of the present disclosure encompasses a method of manufacturing a semiconductor light emitting device package, including manufacturing a semiconductor light emitting device according to the above-noted method of manufacturing a semiconductor light emitting device. The semiconductor light emitting device is mounted on a first portion of a mounting board. The semiconductor light emitting device is electrically connected to a second portion of the mounting board separated from the first portion through a wire, and to the first portion of the mounting board through the second substrate of the semiconductor light emitting device.

Still another aspect of the present disclosure relates to a method of manufacturing a semiconductor light emitting device, including forming, on a first substrate, a light emitting structure layer to include an active layer. It is determined whether compressive or tensile stress is induced in the active layer. Based on a result of the determination, a second substrate is selectively formed to have a material having a coefficient of thermal expansion lower than a coefficient of thermal expansion of the active layer or to have a material having a coefficient of thermal expansion greater than the coefficient of thermal expansion of the active layer. The second substrate is bonded to the light emitting structure layer at a first temperature higher than room temperature. The first substrate is removed from the light emitting structure layer at a second temperature higher than room temperature. The second substrate and the light emitting structure are cooled to reach room temperature.

The second substrate may be formed to have a material having a coefficient of thermal expansion lower than the coefficient of thermal expansion of the active layer, when it is determined that compressive stress is induced in the active layer.

The second substrate may be formed to have a material having a coefficient of thermal expansion greater than the coefficient of thermal expansion of the active layer, when it is determined that tensile stress is induced in the active layer.

DETAILED DESCRIPTION

Hereinafter, exemplary embodiments of the present inventive concept will be described in detail with reference to the accompanying drawings.

FIGS. 1 through 4are cross-sectional views schematically illustrating a sequential process of a method of manufacturing a semiconductor light emitting device according to an exemplary embodiment of the present inventive concept.

FIG. 5is a flow chart illustrating a method of manufacturing a semiconductor light emitting device according to an exemplary embodiment of the present inventive concept.

Referring toFIGS. 1 and 5, a method of manufacturing a semiconductor lighting device according to an exemplary embodiment of the present inventive concept may include operation S1of forming a light emitting structure layer on a first substrate10. Here, the light emitting structure layer refers to a structure including an active layer22emitting light and first and second semiconductor layers21and23disposed above and below the active layer22, respectively.

The first substrate10may be used as a growth substrate for growing the light emitting structure layer20, and a sapphire substrate may be typically used as the first substrate10. A sapphire substrate is a crystal having Hexa-Rhombo R3c symmetry, of which lattice constants in c-axial and a-axial directions are 13.001 Å and 4.758 Å, respectively, and has a C-plane (0001), an A-plane (1120), an R-plane (1102), and the like. In this case, the C-plane of sapphire crystal allows a nitride thin film to be relatively easily grown thereon and is stable at high temperatures, so the sapphire substrate is advantageously used as a substrate for growing a nitride semiconductor. According to an exemplary embodiment of the present inventive concept, a substrate formed of SiC, GaN, ZnO, MgAl2O4, MgO, LiAlO2, LiGaO2, or the like, may also be used.

In the structure of the light emitting structure layer20, the first and second semiconductor layers21and23and the active layer22disposed therebetween may be formed of a Group III-V nitride semiconductor, for example, a material having a composition of AlxInyGa1-x-yN (0≦x≦1, 0≦y≦1, 0≦x+y≦1), or may be formed of AlInGaP or AlInGaAs-based material. Also, the first and second semiconductor layers21and23may be respectively doped with n-type and p-type impurities. The active layer22disposed between the first and second semiconductor layers21and23may emit light having a predetermined level of energy according to electron-hole recombination and may have a multi-quantum well (MQW) structure in which quantum well layers and quantum barrier layers are alternately laminated. The first and second semiconductor layers21and23and the active layer22may be grown through a process known in the art, such as metal-organic chemical vapor deposition (MOCVD), hydride vapor phase epitaxy (HVPE), molecular beam epitaxy (MBE), or the like. Also, although not shown, before the first semiconductor layer21is formed on the first substrate10, a buffer having various structures (crystalline, amorphous, and the like) may be formed to enhance crystallinity of the first semiconductor layer. For example, an undoped GaN layer may be formed as a buffer layer.

In general, when the light emitting structure layer20is grown at a temperature of approximately 1000° C. on the first substrate10and cooled to reach room temperature, stress may be induced in the light emitting structure layer20due to differences in lattice constants and coefficients of thermal expansion between the first substrate10and the light emitting structure layer20. Namely, when a coefficient of thermal expansion of the first substrate10is greater than a coefficient of thermal expansion of the light emitting structure layer20, compressive stress may be induced in the light emitting structure layer20, and when the coefficient of thermal expansion of the first substrate10is lower than the coefficient of thermal expansion of the light emitting structure layer20, tensile stress may be induced in the light emitting structure layer20.

In an exemplary embodiment of the present inventive concept, for example, when the light emitting structure layer20composed of the GaN-based first and second semiconductor layers and the active layer22including InGaN is grown on the first substrate10as a sapphire substrate at a high temperature ranging from approximately 800° C. to 1200° C. and cooled to reach room temperature, since the coefficient of thermal expansion of the first substrate10is greater than the coefficient of thermal expansion of the light emitting structure layer20, compressive stress may be induced in the light emitting structure layer20including the active layer22. Also, the InGaN layer constituting the active layer22having a quantum well structure may have compressive stress additionally induced due to a difference in lattice constants between the InGaN layer and the first and second semiconductor layers21and23, and such compressive stress may form piezoelectric polarization within the quantum well structure to deform an energy band structure and degrade internal quantum efficiency.

For reference, a coefficient of thermal expansion of sapphire is approximately 7.5×10−6/K and that of the GaN-based semiconductor is approximately 5.6×10−6/K. A lattice constant of GaN is 3.189 Å (a-axis) and 5.185 Å (c-axis), and in case of InGaN, a lattice constant thereof is increased as the content of indium (In) is increased.

Thereafter, a reflective metal layer30may be formed on the light emitting structure layer20. The reflective metal layer30may be formed of a metal having electrically ohmic-characteristics with respect to the second semiconductor layer23and having a high level of reflectivity. In consideration of this function, the reflective metal layer30may be formed to include a material such as Ag, Ni, Al, Rh, Pd, Ir, Ru, Mg, Zn, Pt, Au, or the like. The reflective metal layer30may be formed through a process such as sputtering, or the like. In an exemplary embodiment of the present inventive concept, since the reflective metal layer30obtains an advantageous effect rather than being essential, the reflective metal layer30may be excluded.

Referring toFIGS. 2A, 2B, and 5, operation S2of bonding a second substrate50to the light emitting structure layer20may be performed.

The second substrate50may serve as a support supporting the light emitting structure layer20during a follow-up process of removing the first substrate10, or the like. Also, when the second substrate50is formed of a conductive material, the second substrate50may be connected to an external power source to apply an electrical signal to the second semiconductor layer23.

As described above, in an exemplary embodiment of the present inventive concept, when the light emitting structure layer20formed of a GaN-based semiconductor material is formed on the first substrate10, luminous efficiency, specifically, internal quantum efficiency, of a light emitting device may be degraded due to compressive stress induced in the light emitting structure layer20, in particular, within the active layer22as a light emitting unit. Thus, in order to relieve such stress during a follow-up cooling process as described hereinafter, the second substrate50may be selectively formed of a material having a coefficient of thermal expansion lower than a coefficient of thermal expansion of the active layer22to induce tensile stress in the active layer22.

In this respect, the second substrate50may be formed of any one of materials among Si, SiC, GaP, InP, AlN, and graphite, and coefficients of thermal expansion of these materials are respectively 3.59×10−6/K. 4.2×10−6/K, 4.65×10−6/K, 4.6×10−6/K, 4.15×10−6/K, and 3.0×10−6/K. Also, in order to induce tensile stress in the light emitting structure layer20including the active layer22, the second substrate50may have a thickness sufficiently greater than a thickness of the light emitting structure layer20.

Conversely, when tensile stress is induced in the light emitting structure layer20, in particular, in the active layer22, the second substrate50may be formed of a material having a coefficient of thermal expansion greater than a coefficient of thermal expansion of the active layer22in order to relieve the tensile stress.

The process of bonding the second substrate50will be described in detail. First, as illustrated inFIG. 2A, a first bonding material layer40amay be formed on the reflective metal layer30, and a second bonding material layer40bmay be formed on the second substrate50. The first and second bonding material layers40aand40bmay be formed through e-beam evaporation, chemical or physical vapor deposition, or the like. According to an exemplary embodiment of the present inventive concept, the first bonding material layer40amay be formed directly on the light emitting structure layer20. Also, although not shown, a diffusion barrier layer may be formed between the second substrate50and the second bonding material layer40bin order to prevent diffusion of a metal.

Next, as illustrated inFIG. 2B, the first and second bonding material layers40aand40bmay be melted at a first temperature higher than room temperature to form a bonding layer40to bond the second substrate50to the light emitting structure layer20. In this case, in order to facilitate the bonding, pressure may be applied.

In the related art, a bonding metal having a relatively low eutectic temperature is used to minimize bowing or distortion of a substrate during a cooling process to reach room temperature, but in an exemplary embodiment of the present inventive concept, an alloy having a relatively high eutectic temperature of 200° C. or higher may be used as a bonding metal.

When the first temperature, a temperature for bonding the second substrate, is high, a second temperature during a process of separating the first substrate10(seeFIG. 3) as described hereinafter may be increased, which may resultantly increase the effect of alleviating stress due to difference in coefficients of thermal expansion between the second substrate50and the active layer22during a process of performing cooling after the separation. Thus, as a material of the bonding layer40, an AuSn ally (eutectic temperature: approximately 280° C.), an AuGe ally (eutectic temperature: approximately 350° C.), an AuSi ally (eutectic temperature: approximately 380° C.), or the like, may be used. Since bonding is performed at the relatively high first temperature, the light emitting device may be heat-treated at a high temperature in a follow-up process, and thus, quality and operation stability of the light emitting device may be enhanced.

Thereafter, referring toFIGS. 3 and 5, operation S3of separating the first substrate10used for growing the nitride semiconductor layers from the light emitting structure layer20may be performed through a laser lift-off (LLO) scheme.

When a laser is irradiated from the first substrate10, since the first substrate10is a light-transmissive substrate, the first semiconductor layer21may be decomposed by energy absorbed to an interface between the first substrate10and the first semiconductor layer21, whereby the first substrate10is separated. Also, although not shown in detail, when a buffer layer is formed between the first substrate10and the first semiconductor layer21, the buffer layer may be decomposed to separate the first substrate10.

The process of separating the first substrate10may be performed at a second temperature higher than room temperature. The second temperature may vary depending on a eutectic alloy of the bonding layer40, and may be lower than or equal to the first temperature. In an exemplary embodiment of the present inventive concept, when the bonding layer40is formed of AuSn, a process of separating the first substrate10may be performed at the second temperature ranging from 250° C. to 280° C.

Thereafter, referring toFIG. 5, after the first substrate10is removed, operation S4of cooling the second substrate50and the light emitting structure layer20to reach room temperature may be performed.

The second substrate50and the light emitting structure layer20including the active layer22in a bonded state may be contracted while being cooled from the second temperature to room temperature, and at this time, thermal stress may be induced in the light emitting structure layer20due to a difference in coefficients of thermal expansion between the second substrate50and the light emitting structure layer20, and thus, residual stress on the active layer22may be relieved.

In an exemplary embodiment of the present inventive concept, the silicon substrate having a coefficient of thermal expansion lower than a coefficient of thermal expansion of the active layer22may be bonded as the second substrate50and thereafter, the first substrate10may be separated through a laser lift-off (LLO) at the second temperature. During the process of cooling the light emitting structure layer20and the second substrate50in bonded state, the second substrate50may be less contracted than the active layer22, inducing tensile stress in the active layer22to relieve the residual compressive stress in the active layer22.

Subsequently, referring toFIG. 4, a first electrode60may be formed on the first semiconductor layer21exposed as the first substrate10is removed.

The first electrode60may be connected to an external power source to apply an electrical signal to the first semiconductor layer21. The first electrode60may be formed of an electrically conductive material, for example, one of materials among silver (Ag), aluminum (Al), nickel (Ni), chromium (Cr), or the like, and may be formed through a process such as sputtering, or the like.

FIGS. 6A through 6Care cross-sectional views schematically illustrating a sequential process of a method of manufacturing a semiconductor light emitting device according to an exemplary embodiment of the present inventive concept.

Referring toFIG. 6A, conductive vias70electrically connecting the first semiconductor layer21and the second substrate50may be formed.

First, the first semiconductor layer21, the active layer22, the second semiconductor layer23, and the reflective metal layer30may be formed through a method according to the exemplary embodiment ofFIG. 1. Next, the conductive vias70penetrating through the reflective metal layer30, the second semiconductor layer23, and the active layer22may be formed. The first semiconductor layer21may be electrically connected to the second substrate50through the conductive vias70, and here, the amount, shape, pitch, and the like, of the conductive vias70may be appropriately adjusted to lower contact resistance.

For electrical insulation, an insulating layer71may be formed on the periphery of the conductive vias70and on the reflective metal layer30. The insulating layer71may be formed of a material as long as it has electrical insulating properties, but in terms of minimizing light absorption, the insulating layer71may be formed of, for example, a silicon oxide, a silicon oxynitride, or a silicon nitride, such as SiO2, SiOxNy, SixNy.

Thereafter, as illustrated inFIG. 6B, the second substrate50may be bonded to the conductive vias70and the insulating layer71through the medium of a bonding layer40.

Here, the second substrate50may be bonded to the conductive vias70and the insulating layer71by eutectic bonding at the first temperature through a method of the exemplary embodiment ofFIGS. 2A and 2B.

Thereafter, referring toFIG. 6C, the first substrate10may be separated, a portion of the light emitting structure layer20may be removed, and a second electrode80may be formed.

In this case, as described above with reference toFIGS. 3 through 5, operation S3of separating the first substrate10through a laser lift-off (LLO) at the second temperature and operation S4of cooling the resultant structure to reach room temperature may be performed. In order to apply an electrical signal to the second semiconductor layer23, a portion of the light emitting structure layer20may be removed to expose a portion of the surface of the reflective metal layer30, and the second electrode80may be formed on the exposed portion of the reflective metal layer30. With this electrode connection scheme, an electrode may not be formed on a surface of the first semiconductor layer21, thereby enhancing light extraction efficiency.

FIG. 7is a graph illustrating characteristics of a semiconductor light emitting device according to an exemplary embodiment of the present inventive concept.

Referring toFIG. 7together withFIG. 4, when the light emitting structure layer20is formed with a GaN-based nitride semiconductor on the first substrate10as a sapphire substrate according to an exemplary embodiment of the present inventive concept, compressive stress may be induced in the light emitting structure layer20including the active layer22.

In this case, according to an exemplary embodiment of the present inventive concept, a silicon substrate, as the second substrate50, having a coefficient of thermal expansion lower than a coefficient of thermal expansion of the active layer22may be bonded through the medium of the AuSn bonding layer40at the first temperature of 300° C., the first substrate10may be separated through a laser lift-off (LLO) at the second temperature ranging from 250° C. to 280° C., and the resultant structure may be subsequently cooled to reach room temperature. Also, in a comparative example, a SiAl substrate, as the second substrate50, having a coefficient of thermal expansion similar to a coefficient of thermal expansion of the active layer22was bonded by the medium of the AuSn bonding layer40, the resultant structure was cooled to reach room temperature, and the first substrate10was subsequently removed through a laser lift-off (LLO).

When compared, it was confirmed that the use of the silicon substrate as the second substrate50according to an exemplary embodiment of the present inventive concept enhanced internal quantum efficiency of a manufactured semiconductor light emitting device by 2% or more than the use of the SiAl substrate (comparative example). Also, it was observed that the lattice constant of the a-axis of GaN constituting the light emitting structure layer20was further increased in the case of using the silicon substrate as the second substrate50, relative to the comparative example, and the lattice constant of the c-axis of GaN was further reduced in the case of using the silicon substrate. This means that the use of the silicon substrate as the second substrate may further relieve compressive stress in the light emitting structure layer20including the active layer22.

As set forth above, according to exemplary embodiments of the present inventive concept, after the second substrate having a coefficient of thermal expansion different from a coefficient of thermal expansion of the active layer is bonded at a temperature higher than room temperature, the first substrate may be separated, and while the resultant structure is being cooled to reach room temperature, the residual stress in the active layer may be relieved, and furthermore, luminous efficiency (internal quantum efficiency) of the light emitting device may be increased.

FIGS. 8 and 9are views illustrating examples of packages employing a semiconductor light emitting device according to an exemplary embodiment of the present inventive concept.

Referring toFIG. 8, a semiconductor light emitting device package1000may include a semiconductor light emitting device1001, a package body1002, and a pair of lead frames1003. The semiconductor light emitting device1001may be mounted on the lead frames1003and electrically connected to the lead frames1003through a wire W and through the second substrate50(refer toFIG. 4). According to an exemplary embodiment of the present inventive concept, the semiconductor light emitting device1001may be mounted on a different region, for example, on the package body1002, rather than on the lead frames1003. The package body1002may have a cup shape, e.g., a recess, to improve the reflectivity efficiency of light. An encapsulant1005formed of a light-transmissive material may be formed in the reflective cup to encapsulate the semiconductor light emitting device1001, the wire W, and the like. In an exemplary embodiment of the present inventive concept, the semiconductor light emitting device package1000may include the semiconductor light emitting device manufactured according to the method of manufacturing a semiconductor light emitting device illustrated inFIGS. 1 through 4, and may include the semiconductor light emitting device manufactured through the method of manufacturing a semiconductor light emitting device illustrated inFIGS. 6A through 6C.

Referring toFIG. 9, a semiconductor light emitting device package2000may include a semiconductor light emitting device2001, a mounting board2010, and an encapsulant2003. The semiconductor light emitting device2001may be mounted on the mounting board2010and electrically connected to the mounting board2010through a wire W and through the second substrate50(refer toFIG. 4), and in an exemplary embodiment of the present inventive concept, the second substrate50may be a conductive substrate.

The mounting board2010may include a board body2011, an upper electrode2013, and a lower electrode2014. Also, the mounting board2010may include a through electrode2012connecting the upper electrode2013and the lower electrode2014. The mounting board2010may be provided as a board such as a printed circuit board (PCB), a metal-core printed circuit board (MCPCB), a metal printed circuit board (MPCB), a flexible printed circuit board (FPCB), or the like, and the structure of the mounting board2010may be applied to have various forms.

The wavelength conversion part2002may include fluorescent materials or quantum dots. The encapsulant2003may be formed to have a lens structure with an upper surface having a convex dome shape. However, according to an exemplary embodiment of the present inventive concept, the encapsulant2003may have a lens structure having a convex or concave surface to adjust a beam angle of light emitted through an upper surface of the encapsulant2003.

In an exemplary embodiment of the present inventive concept, the semiconductor light emitting device package2000may include the semiconductor light emitting device manufactured through the method of manufacturing a semiconductor light emitting device illustrated inFIGS. 1 through 4, and may include the semiconductor light emitting device manufactured through the method of manufacturing a semiconductor light emitting device illustrated inFIGS. 6A through 6C.

FIGS. 10 and 11are views illustrating examples of backlight units employing semiconductor light emitting device according to an exemplary embodiment of the present inventive concept.

Referring toFIG. 10, a backlight unit3000may include light sources3001mounted on a substrate3002and one or more optical sheets3003disposed above the light sources3001. The semiconductor light emitting device package having the structure described above with reference toFIGS. 8 and 9or a structure similar thereto may be used as the light sources3001. Alternatively, a semiconductor light emitting device may be directly mounted on the substrate3002(a so-called chip-on-board (COB) type) and used.

Unlike the backlight unit3000inFIG. 10in which the light sources3001emit light toward an upper side where a liquid crystal display is disposed, a backlight unit4000as another example illustrated inFIG. 11may be configured such that a light source4001mounted on a substrate4002emits light in a lateral direction, and the emitted light may be made to be incident to a light guide plate4003so as to be converted into a surface light source. The semiconductor light emitting device package having the structure described above with reference toFIGS. 8 and 9or a structure similar thereto may be used as the light sources4001. Light, passing through the light guide plate4003, is emitted upwards, and in order to enhance light extraction efficiency, a reflective layer4004may be disposed on a lower surface of the light guide plate4003.

FIG. 12is a view illustrating an example of a lighting device employing a semiconductor light emitting device according to an exemplary embodiment of the present inventive concept.

Referring to the exploded perspective view ofFIG. 12, a lighting device5000is illustrated as, for example, a bulb-type lamp and may include a light emitting module5003, a driving unit5008, and an external connection unit5010. Also, the lighting device5000may further include external structures such as external housings5006, internal housings5009and a cover unit5007, and the like. The light emitting module5003may include a semiconductor light emitting device5001having a structure identical or similar to that of the semiconductor light emitting device ofFIG. 1manufactured through at least one of the methods of manufacturing a semiconductor light emitting device illustrated inFIGS. 1 through 4 and 6A through 6C, and a circuit board5002having the semiconductor light emitting device5001mounted thereon. In an exemplary embodiment of the present inventive concept, a single semiconductor light emitting device5001may be mounted on the circuit board5002, but a plurality of semiconductor light emitting devices may be mounted as needed. Also, the semiconductor light emitting device5001may be manufactured as a package and subsequently mounted, rather than being directly mounted on the circuit board5002.

The external housing5006may serve as a heat dissipation unit and may include a heat dissipation plate5004disposed to be in direct contact with the light emitting module5003to enhance heat dissipation, and heat dissipation fins5005surrounding the lateral surfaces of the lighting device5000. Also, the cover unit5007may be installed on the light emitting module5003and have a convex lens shape. The driving unit5008may be installed in the internal housing5009and connected to the external connection unit5010having a socket structure to receive power from an external power source. Also, the driving unit5008may convert power into an appropriate current source for driving the semiconductor light emitting device5001of the light emitting module5003, and provide the same. For example, the driving unit5008may be configured as an AC-DC converter, a rectifying circuit component, or the like.

Also, although not shown, the lighting device5000may further include a communications module.

FIG. 13is a view illustrating an example of a headlamp employing a semiconductor light emitting device according to an exemplary embodiment of the present inventive concept.

Referring toFIG. 13, a headlamp6000used as a vehicle lamp, or the like, may include a light source6001, a reflective unit6005, and a lens cover unit6004. The lens cover unit6004may include a hollow guide6003and a lens6002. The light source6001may include at least one of semiconductor light emitting device packages ofFIGS. 8 and 9. The headlamp6000may further include a heat dissipation unit6012outwardly dissipating heat generated by the light source6001. In order to effectively dissipate heat, the heat dissipation unit6012may include a heat sink6010and a cooling fan6011. Also, the headlamp6000may further include a housing6009fixedly supporting the heat dissipation unit6012and the reflective unit6005, and the housing6009may have a body unit6006and a central hole6008formed in one surface thereof, in which the heat dissipation unit6012is coupled. Also, the housing6009may have a front hole6007formed in the other surface integrally connected to the one surface and bent in a right angle direction. The reflective unit6005may be fixed to the housing6009such that light generated by the light source6001is reflected thereby to pass through the front hole6007to be outputted outwardly.