Light emitting device and lighting system

Disclosed are a light emitting device, a method of manufacturing a light emitting device, a light emitting device package and a lighting system. The light emitting device includes a substrate; a first conductive semiconductor layer on the substrate; an active layer on the first conductive semiconductor layer; a second conductive semiconductor layer on the active layer; a contact layer on the second conductive semiconductor layer; an insulating layer on the contact layer; a first branch electrode electrically connected to the first conductive semiconductor layer; a plurality of first via electrodes connected to the first branch electrode and electrically connected to the first conductive semiconductor layer by passing through the insulating layer; a first pad electrode electrically connected to the first branch electrode; a second pad electrode contacts the contact layer by passing through the insulating layer; a second branch electrode connected to the second pad electrode and disposed on the insulating layer; and a plurality of second via electrodes provided through the insulating layer to electrically connect the second branch electrode to the contact layer.

CROSS-REFERENCE TO RELATED APPLICATIONS

The present application claims priority under 35 U.S.C. 119 to Korean Patent Application No. 10-2014-0151308 filed on Nov. 3, 2014, which is hereby incorporated by reference in its entirety.

BACKGROUND

The embodiment relates to a light emitting device, a method of manufacturing a light emitting device, a light emitting device package and a lighting system.

A light emitting device (LED) includes a p-n junction diode having a characteristic of converting electric energy into light energy. The p-n junction diode may be formed by combining group III-V elements of the periodic table. The LED may represent various colors by adjusting the compositional ratio of compound semiconductors.

When a forward voltage is applied to an LED, electrons of an n layer are combined with holes of a p layer, so that energy corresponding to an energy gap between a conduction band and a valance band may be released. The LED emits the energy as the light.

For instance, a nitride semiconductor represents superior thermal stability and wide band gap energy, so that the nitride semiconductor has been spotlighted in the field of optical devices and high-power electronic devices. In particular, blue, green, and UV light emitting devices employing the nitride semiconductor have already been commercialized and extensively used.

A light emitting device may be classified into a lateral type and a vertical type according to the positions of an electrode.

The lateral-type light emitting device among light emitting devices according to the related art is formed in a structure in which a nitride semiconductor layer is formed on a substrate, and two electrode layers are disposed on the nitride semiconductor layer.

Meanwhile, the lateral-type light emitting device according to the related art has a great loss caused at the active layer able to emit light since mesa etching is performed over a large area. In order to compensate for the loss, various attempts are performed to ensure a wider active layer.

For example, according to the related art, there has been an attempt to secure a relatively larger area of an active layer by forming an electrode making contact with a nitride semiconductor layer in a through-electrode type to allow the electrode to be partially and electrically connected to the nitride semiconductor layer so that a removed area of the active area is reduced. However, the related art has a problem in reliability since an operating voltage VF is increased, and thus, the improvement is required.

In addition, according to the related art, the light extraction efficiency may be degraded due to the light absorption of the electrode layer.

SUMMARY

The embodiment is to provide a light emitting device having superior light efficiency and reliability, a method of manufacturing a light emitting device, and a light emitting device package and a lighting system.

In addition, the embodiment is to provide a light emitting device having superior light efficiency and reliability, a method of manufacturing a light emitting device, and a light emitting device package and a lighting system.

To achieve the object, according to the embodiment, there is provided a light emitting device which includes: a substrate105; a first conductive semiconductor layer112on the substrate105; an active layer114on the first conductive semiconductor layer112; a second conductive semiconductor layer116on the active layer114; an contact layer120on the second conductive semiconductor layer116; an insulating layer130on the contact layer120; a first branch electrode146electrically connected to the first conductive semiconductor layer112; a plurality of first via electrodes145connected to the first branch electrode146and electrically connected to the first conductive semiconductor layer112by passing through the insulating layer130; a first pad electrode142electrically connected to the first branch electrode146; a second pad electrode152contacts the contact layer120by passing through the insulating layer130; a second branch electrode156connected to the second pad electrode152and disposed on the insulating layer130; and a plurality of second via electrodes155provided through the insulating layer130to electrically connect the second branch electrode156to the contact layer120.

In addition, a light emitting device according to the embodiment includes a light emitting structure110including a first conductive semiconductor layer112, an active layer114and a second conductive semiconductor layer116; a first branch electrode146electrically connected to the first conductive semiconductor layer112; a plurality of third via electrodes149connected to the first branch electrode146and electrically connected to the first conductive semiconductor layer112by passing through a predetermined insulating layer130; a second branch electrode156electrically connected to the second conductive semiconductor layer116while interposing an contact layer120between the second branch electrode156and the second conductive semiconductor layer116; and a plurality of second via electrodes155disposed between the second branch electrode156and the contact layer120while passing through the insulating layer130.

One of the third via electrodes149electrically connected to the first conductive semiconductor layer112has a third horizontal width W3wider than a second horizontal width W of the second via electrode155disposed on the contact layer130.

A light system may include a light emitting unit having a light emitting device.

According to the embodiment, the embodiment can provide a light emitting device having superior light efficiency and reliability, a method of manufacturing a light emitting device, and a light emitting device package and a lighting system.

In addition, according to the embodiment, the embodiment can provide a light emitting device having superior light extraction efficiency and reliability, a method of manufacturing a light emitting device, and a light emitting device package and a lighting system.

DETAILED DESCRIPTION OF THE EMBODIMENTS

In the description of the embodiments, it will be understood that, when a layer (or film), an area, a pattern, or a structure is referred to as being “on” or “under” another substrate, another layer (or film), another area, another pad, or another pattern, it can be “directly” or “indirectly” over the other substrate, layer (or film), area, pad, or pattern, or one or more intervening layers may also be present. Such a position of the layer has been described with reference to the drawings.

Embodiment

FIG. 1is a plan view showing a light emitting device100according to a first embodiment.FIG. 2is a first sectional view taken along line I-I′ ofFIG. 1.FIG. 4is a second sectional view taken along line II-II′ ofFIG. 1.

As shown inFIG. 2, a light emitting device100according to the first embodiment may include a substrate105, a first conductive semiconductor layer112formed on the substrate105, an active layer114formed on the first conductive semiconductor layer112, and a second conductive semiconductor layer116formed on the active layer114. The first and second conductive semiconductor layers112and116and the active layer114may constitute a light emitting structure110.

In addition, as shown inFIG. 2, the light emitting device100according to the first embodiment may include an contact layer120formed on the second conductive semiconductor layer116, an insulating layer130formed on the contact layer120, a first branch electrode146electrically connected to the first conductive semiconductor layer112, and a first pad electrode142connected to the first branch electrode146so that the first pad electrode142is electrically connected to the first conductive semiconductor layer112.

In addition, the light emitting device100according to the first embodiment may include a plurality of first via electrodes145which are connected to the first branch electrode146and pass through the insulating layer130such that the first via electrodes145are electrically connected to the first conductive semiconductor layer112.

A first electrode140may include the first pad electrode142, the first branch electrode146and the first via electrodes145.

As shown inFIG. 4, the light emitting device100according to the first embodiment may include a second pad electrode152passing through the insulating layer130to make contact with an contact layer120, a second branch electrode156disposed on the insulating layer130while being connected to the second pad electrode152, and a second via electrode155interposed between the second branch electrode156and the contact layer120while passing through the insulating layer130.

A second electrode150may include the second pad electrode152, the second branch electrode156and the second via electrode155.

Hereinafter, the characteristics of the light emitting device100according to an embodiment will be described with reference toFIGS. 2aand3. Although the lateral-type light emitting device according to the first embodiment is shown inFIGS. 1, 2aand3, the embodiment is not limited thereto.

According to the first embodiment, the substrate105may include an insulating substrate or a conductive substrate. For example, the substrate105may include at least one of sapphire (Al2O3), SiC, Si, GaAs, GaN, ZnO, GaP, InP, Ge, and Ga2O3, or the combination thereof, but the embodiment is not limited thereto. A predetermined concave-convex structure (not shown) may be formed on the substrate105to improve light extraction efficiency, but the embodiment is not limited thereto.

According to the first embodiment, a predetermined buffer layer (not shown) is formed on the substrate105to reduce lattice mismatch between the light emitting structure110and the substrate105. The buffer layer may include at least one of GaN, InN, AlN, InGaN, AlGaN, InAlGaN, and AlInN, but the embodiment is not limited thereto.

According to the first embodiment, the light emitting device100may include the light emitting structure110formed on the substrate105or the buffer layer. The light emitting structure110may include the first conductive semiconductor layer112on the substrate105, the active layer114on the first conductive semiconductor layer112, and the second conductive semiconductor layer116on the active layer114.

The first conductive semiconductor layer112may be realized using a group III-V compound semiconductor doped with first conductive dopants. For example, when the first conductive semiconductor layer112is an N type semiconductor layer, the first conductive dopants may include Si, Ge, Sn, Se, and Te serving as N type dopants, but the embodiment is not limited thereto.

In the active layer114, electrons injected through the first conductive semiconductor layer112and holes injected through the second conductive semiconductor layer116thereafter meet each other, so that light having energy determined by the inherent energy band of a material constituting the active layer (light emission layer) is emitted.

The active layer114may include at least one of a single quantum well, a multi-quantum well (MQW), a quantum-wire structure, and a quantum dot structure.

The active layer114may have a well layer/barrier layer. For example, the active layer114may be formed in a pair structure having at least one of InGaN/GaN, InGaN/InGaN, GaN/AlGaN, InAlGaN/GaN, GaAs/AlGaAs, GaP/AlGaP, InGaAs/AlGaAs and InGaP/AlGaP, but the embodiment is not limited thereto. The well layer may include a material having a bandgap lower than that of the barrier layer.

According to the first embodiment, an electron blocking layer (not shown) may be formed on the active layer114. For example, the electron blocking layer may include a semiconductor based on AlxInyGa(1-x-y)N (0≦x≦1, 0≦y≦1), and may have the energy bandgap higher than that of the active layer114. The electron blocking layer160is implanted with P type ions to effectively block overflowed electrons, so that hole injection efficiency may be increased.

According to the embodiment, the second conductive semiconductor layer116may include a group III-V compound semiconductor layer doped with second conductive dopants. For example, the second conductive semiconductor layer116may include a semiconductor material having a composition formula of InxAlyGa1-x-yN (0≦x≦1, 0≦y≦1, 0≦x+y≦1). When the second conductive semiconductor layer116includes a P type semiconductor layer, the second conductive dopant may include Mg, Zn, Ca, Sr, or Ba serving as the second conductive dopant.

As shown inFIG. 2a, according to the first embodiment, the light emitting device100may include the contact layer120on the second conductive semiconductor layer116, the insulating layer130on the contact layer120, the first branch electrode146electrically connected with the first conductive semiconductor layer112, the first via electrodes145connected with the first branch electrode146and passing through the insulating layer130to be electrically connected to the first conductive semiconductor layer112, and the first pad electrode142connected with the first branch electrode140so that the first pad electrode142is electrically connected to the first conductive semiconductor layer112.

The contact layer120may be formed by multi-layering single metal, a metal alloy, and a metallic oxide so that carriers may be efficiently implanted. The contact layer120includes a transmissive electrode to improve the light extraction efficiency and to lower the operating voltage, so that the reliability may be improved.

The insulating layer130may include an electrical insulator including an oxide or a nitride, but the embodiment is not limited thereto. The insulating layer130may perform a short protection function. For example, the insulating layer130may be interposed between the first via electrode145, the contact layer120, the second conductive semiconductor layer116and the active layer114, so that the first via electrode145, the contact layer120, the second conductive semiconductor layer116and the active layer114are prevented from being short circuited with each other.

The insulating layer130is formed of a transmissive insulating material so that the light extraction efficiency may be improved.

As shown inFIG. 2, according to the first embodiment, the active layer114is not mesa-etched at the position in which the first pad electrode142is formed, thereby securing an active layer region to improve internal light emission efficiency, and to improve light efficiency due to current spreading.

Thus, according to the first embodiment, the first pad electrode142is disposed on the insulating layer130, so that the first pad electrode142may be connected to the first branch electrode146. The first pad electrode142may vertically overlap the insulating layer130and the contact layer120. The contact layer120is provided under the first pad electrode142while interposing the insulating layer130between the contact layer120and the first pad electrode142, thereby widening a light emission area to improve carrier injection efficiency, so that light efficiency may be improved.

According to the first embodiment, as shown inFIG. 2, the contact layer120, the second conductive semiconductor layer116and the active layer114are partially removed through the mesa-etching process, so that the first conductive semiconductor layer112may be partially exposed.

The first branch electrode146may be electrically connected to the exposed first conductive semiconductor layer112.

According to the first embodiment, an N type branch electrode structure sufficiently secures a contact area with an N type semiconductor layer to prevent the operating voltage from being increased so that the reliability of the device may be improved. The P type branch electrode employs a point contact structure to contribute to current spreading. The second conductive semiconductor layer116makes contact with the contact layer120to prevent the operating voltage from being increased, so that the reliability and the light emission efficiency of the device may be maximized.

To this end, according to the first embodiment, as shown inFIGS. 1 and 2a, the first horizontal width W1of one of the first via electrodes145electrically connected to the first conductive semiconductor layer112is longer than the first distance D1between the first via electrodes145, so that the area, in which the first via electrode145is electrically connected to the first conductive semiconductor layer112, may be sufficiently secured, thereby preventing the operating voltage from being increased to improve the reliability of the light emitting device.

In addition, according to the second embodiment, as shown inFIG. 4, the second horizontal width W2of one of the second via electrodes155electrically connected to the contact layer120is longer than the second distance D2between the second via electrodes155, so that the area, in which the second via electrode155is electrically connected to the contact layer120, may be sufficiently secured, thereby preventing the operating voltage from being increased to improve the reliability of the light emitting device.

Table 1 shows the electrical characteristics of an embodiment example and a comparative example for comparison.

As shown in Table 1, according to the first embodiment, a first horizontal width W1of one of the first via electrodes145electrically connected to the first conductive semiconductor layer112is set to be longer than a first distance D1between the first via electrodes145, and a second horizontal width W2of one of the second via electrodes155electrically connected to the contact layer120is set to be longer than a first distance D2between the second via electrodes155. According to the comparative example, the horizontal width of a via electrode of a light emitting device to which a point contact is applied is substantially equal to a distance between the via electrodes.

As described above, according to the related art, an attempt to secure a wider active layer is performed based on the electrical connection with the nitride semiconductor layer through a via electrode. However, the related art has a problem in reliability since the operating voltage VF is increased.

As shown in Table 1, when the first embodiment is applied, as compared with the related art, the operating voltage VF is reduced, so that the reliability is improved. In addition, the intensity of light (Po) is increased from 102.84 mW to 107 mW, so that the wall-plug efficiency (WPE) is increased by about 2.5% from 55.24% to 57.82%.

Meanwhile, in case of a point contact structure according to the related art, an issue of increasing the operating voltage by varying a metal layer according to a partial contact has been raised.

For example,FIG. 5is a photo of a light emitting device according to the related art, where a light emitting structure10according to the related art includes a GaN layer, and an electrode layer20includes a Cr layer21, an Al layer22and a Ni layer23.

According to the related art, when the electrode layer20is formed on the light emitting structure10, as temperature is increased, inter metallic compounds I are generated, so that the electrode layer20is brittle and the operating voltage is increased, thereby raising an issue in electrical reliability.

According to the first embodiment, the first horizontal width W1of one of the first via electrodes145electrically connected to the first conductive semiconductor layer112is controlled to be longer than the first distance D1between the first via electrodes145, so that the electrical contact area with the first conductive semiconductor layer112may be sufficiently secured. Thus, the center current crowding of the light emitting device may be minimized so that the light efficiency is improved. In addition, the electrical reliability may be improved so that the light efficiency is improved.

According to the first embodiment, the first horizontal width W1of the first via electrode145electrically connected to the first conductive semiconductor layer112may be 2.5 times or more of the first distance D1between the first via electrodes145.

For example, according to the first embodiment, the first horizontal width W1of one of the first via electrodes145may be equal to or more than about 50 μm and the first distance D1between the first via electrodes145may be about 20 μm, but the embodiment is not limited thereto. When the first horizontal width W1of one of the first via electrodes145is less than about 50 μm, due to current crowding, the operating voltage Vf may be increased to exert an influence on the reliability.

For example, the first embodiment, the first horizontal width W1of one of the first via electrodes145may be in the range of about 50 μm to about 70 μm and the first distance D1between the first via electrodes145may be in the range of about 15 μm to 25 μm, but the embodiment is not limited thereto.

Although the horizontal width of the via electrode of the comparative example shown in Table 1 is about 20 μm, the first horizontal width W1of the first via electrode145according to the first embodiment is controlled to be in the range of about 50 μm to about 70 μm, preferably, about 54 μm to about 66 μm, so that the electrical contact area with the first conductive semiconductor layer112may be sufficiently secured to minimize the center current crowding of the light emitting device chip, thereby improving the electrical reliability as well as the light efficiency.

As the comparative example, when the horizontal width of the via electrode is approximate to the distance between the via electrodes, the contact area between the first conductive semiconductor layer and the via electrode is insufficient to secure significant light intensity and electrical reliability.

FIG. 3is an enlarged view of part A ofFIG. 1.

Referring toFIGS. 1 to 3, according to the embodiment, when viewed from the top, a second thickness T2of one of the second via electrodes155making contact with the contact layer120is thicker than a first thickness T1of the second branch electrode156, so that the area substantially making contact with the contact layer120is widely secured and the remaining areas are set to be narrow. Thus, the electrical reliability may be improved and. degradation of the light extraction efficiency, which may be caused as the emitted light is reflected or blocked by the branch electrode, can be prevented.

For example, when a high current is applied and the second thickness T2of one of the second via electrode155is relatively enlarged when viewed from the top, the electrical reliability may be improved.

Although not shown in any drawings, the first electrode140may employ technical properties of the second electrode150including the second branch electrode156having the first thickness T1and the second via electrode155having the second thickness T2.

FIG. 6is a third sectional view of a light emitting device102taken along line I-I′ ofFIG. 1according to a second embodiment.FIG. 7is a fourth sectional view of a light emitting device taken along line II-II′ ofFIG. 1according to the second embodiment.

As shown inFIG. 6, according to the second embodiment, the first electrode140may include a first contact branch electrode144making contact with the first conductive semiconductor layer112and a first reflective branch electrode147disposed on the first via electrode145.

According to the second embodiment, by employing the first contact branch electrode144making contact with the first conductive semiconductor layer112, the contact property between the first via electrode145and the first conductive semiconductor layer112may be secured at the maximum, so that the operating voltage is reduced to improve the electrical reliability.

For example, the first contact branch electrode144may include at least one of Cr, Ni, Ti, Rh, Pd, Ir, Ru, Pt, Au and Hf, or the combination thereof, but the embodiment is not limited thereto.

In addition, according to the embodiment, the first reflective branch electrode147is provided at a lower portion of the first branch electrode146, so that the light absorption by the first branch electrode146may be minimized, thereby improving the external light extraction efficiency.

The first reflective branch electrode147may include at least one of Ag, Al, Ni, Ti, Rh, Pd, Ir, Ru, Mg, Zn, Pt, Au, and Hf, or the combination thereof, but the embodiment is not limited thereto.

The first reflective branch electrode147may be formed in a multi-layered structure, but the embodiment is not limited thereto. For example, if the first reflective branch electrode147is formed to have two layers, the first reflective branch electrode147may include Al/Ni or Ag/Ni. If the first reflective branch electrode147is formed to have a single layer, the first reflective branch electrode147may include a distributed bragg reflector (DBR), but the embodiment is not limited thereto.

In addition, as shown inFIG. 7, the second electrode150according to the second embodiment may include the second reflective branch electrode157which is provided at an lower portion of the second branch electrode156, so that the light absorption by the second branch electrode156may be minimized, thereby improving the external light extraction efficiency.

The second reflective branch electrode157may include at least one of Ag, Al, Ni, Ti, Rh, Pd, Ir, Ru, Mg, Zn, Pt, Au, and Hf, or the combination thereof, but the embodiment is not limited thereto. The second reflective branch electrode157may be formed in a multi-layered structure, but the embodiment is not limited thereto.

FIG. 8is a fifth sectional view taken along line II-II′ ofFIG. 1according to a third embodiment.

According to the third embodiment, the second electrode150may include a second reflective via electrode154at an outside of the second via electrode155.

The second reflective via electrode154may be interposed between the contact layer120and the second via electrode155. The second reflective via electrode154may surround the side surface of the second via electrode155, but the embodiment is not limited thereto.

According to the third embodiment, since the second reflective via electrode154is provided to the outside of the second via electrode155, the light absorption by the second via electrode155may be minimized.

FIG. 9is a plan view showing a light emitting device according to a fourth embodiment.FIG. 10is a sixth sectional view taken along line III-III′ ofFIG. 9.FIG. 11is a seventh sectional view taken along line IV-IV′ ofFIG. 9.

The light emitting device104according to the fourth embodiment may include a light emitting structure110including a first conductive semiconductor layer112, an active layer114and a second conductive semiconductor layer116, a first branch electrode146electrically connected to the first conductive semiconductor layer112, a plurality of third via electrodes149connected to the first branch electrode146and electrically connected to the first conductive semiconductor layer112by passing through a predetermined insulating layer130, a second branch electrode156electrically connected to the second conductive semiconductor layer116while interposing an contact layer120therebetween, and a plurality of second via electrodes155disposed between the second electrode156and the contact layer120while passing through the insulating layer130.

The fourth embodiment may employ technical properties of the first to third embodiments.

As shown inFIG. 9, according to the fourth embodiment, the third horizontal width W3of one of the third via electrodes149electrically connected to the first conductive semiconductor layer112may be greater than the second horizontal width W2of the second via electrode disposed on the contact layer130.

According to the fourth embodiment, the third horizontal width W3of the third via electrode149electrically connected to the first conductive semiconductor layer112is controlled to be greater than the second horizontal width W2of the second via electrode155electrically connected to the contact layer120, so that the area of the third via electrode149making electrical contact with the first conductive semiconductor layer112may be sufficiently secured on the central portion of a chip of which the current crowding is greatly issued. Thus, the center current crowding of the central portion may be minimized so that the light efficiency is improved. In addition, the electrical reliability may be improved so that the light efficiency is improved.

In addition, as shown inFIG. 9, according to the fourth embodiment, the third horizontal width W3of the third via electrode149connected to the first branch electrode146may be about three times or more of a third distance D3between the third via electrodes149. Thus, the third via electrodes149may be disposed to the first branch electrodes146by assigning two third via electrodes149to one first branch electrode146.

According to the fourth embodiment, the third distance D3between the third via electrodes149may be longer than the second distance D2between the second via electrodes155for the purpose of current spreading. For example, the third distance D3between the third via electrodes149may be secured to be about 100 μm or more for the purpose of current spreading so that current crowding may be prevented and the electrical reliability may be ensured due to current spreading.

According to the fourth embodiment, the area of the third via electrode149making electrical contact with the first conductive semiconductor layer112may be sufficiently secured to prevent the operating voltage from being increased, so that the reliability of a light emitting device may be more improved.

FIG. 12is an eighth sectional view taken along line III-III′ ofFIG. 9.

As shown inFIG. 12, the first electrode140of the light emitting device according to the fourth embodiment may include the third reflective branch electrode147which is provided at an lower portion of the first branch electrode146, so that the light absorption by the first branch electrode146may be minimized, thereby improving the external light extraction efficiency.

The third reflective branch electrode147may include at least one of Ag, Al, Ni, Ti, Rh, Pd, Ir, Ru, Mg, Zn, Pt, Au, and Hf, or the combination thereof, but the embodiment is not limited thereto. The third reflective branch electrode147may be formed in a multi-layered structure, but the embodiment is not limited thereto.

According to the embodiment, the embodiment can provide a light emitting device having superior light efficiency and reliability, a method of manufacturing a light emitting device, and a light emitting device package and a lighting system.

In addition, according to the embodiment, the embodiment can provide a light emitting device having superior light extraction efficiency and reliability, a method of manufacturing a light emitting device, and a light emitting device package and a lighting system.

FIG. 13is a sectional view showing a light emitting device package in which the light emitting device according to an embodiment is mounted.

The light emitting device package according to an embodiment may include a package body part205, third and fourth electrode layers213and214mounted on the package body part205, a light emitting device100mounted on the package body part205and electrically connected with the third and fourth electrode layers213and214, and a molding member230having phosphor232and surrounding the light emitting device100.

The third and fourth electrode layers213and214are electrically isolated from each other to supply power to the light emitting device100. In addition, the third and fourth electrode layers213and214reflect light emitted from the light emitting device100to improve light efficiency, and emitting heat generated from the light emitting device100to an outside.

The light emitting device100may be electrically connected with the third electrode layer213and/or the fourth electrode layer214through one of a wire scheme, a flip-chip scheme and a die-bonding scheme.

FIG. 14is an exploded perspective of a lighting system according to an embodiment.

The lighting system according to the embodiment may include a cover2100, a light source module2200, a heat radiation member2400, a power supply unit2600, an internal case2700, and a socket2800. In addition, the lighting system according to the embodiment may further include at least one of a member2300and a holder2500. The light source module2200may include the light emitting device or the light emitting device package according to the embodiment.

The light source module2200may include a light source unit2210, a connection plate2230, and a connector2250. The member2300is provided on a top surface of the heat radiation member2400, and has a guide groove2310into which a plurality of light source units2210and the connector2250are inserted.

The holder2500closes a receiving groove2719of an insulating part2710provided in the internal case2700. Accordingly, the power supply unit2600, which is received in the insulating part2710of the internal case2700, is sealed. The holder2500has a guide protrusion part2510.

The power supply unit2600may include a protrusion part2610, a guide part2630, a base2650, and an extension part2670. The inner case2700may include a molding part together with the power supply unit2600. The molding part is formed by hardening a molding solution to fix the power supply unit2600to an inner part of the internal case2700.

A plurality of light emitting device packages according to the embodiment are arrayed on a substrate, and a light guide plate, a prism sheet, a diffusion sheet and a fluorescent sheet serving as optical members may be disposed on a path of light emitted from the light emitting device packages.

The light emitting device according to the embodiment may be applied to a backlight unit, a lighting unit, a display device, an indicator, a lamp, a street lamp, a vehicle lighting device, a vehicle display device, a smart clock, and the like, but the embodiment is not limited thereto.