Light emitting device, light emitting device and package, and lighting system

Provided are a light emitting device, a light emitting device package, and a lighting system. The light emitting device comprises a light emitting structure layer comprising a first conductive type semiconductor layer, a second conductive type semiconductor layer, and an active layer between the first conductive type semiconductor layer and the second conductive type semiconductor layer, and an electrode comprising a pad part and a finger part on the light emitting structure layer. The pad part comprises a pattern in which at least one opening is defined, and the finger part comprises a pattern electrically connected to the pad part and linearly extending from the pad part.

CROSS-REFERENCE TO RELATED APPLICATIONS

The present application claims priority under 35 U.S.C. §119(a) of Korean Patent Application No. 10-2009-0123005 filed on Dec. 11, 2009, which is hereby incorporated by reference in its entirety.

BACKGROUND

Embodiments relate to a light emitting device, a light emitting device package, and a lighting system.

Light emitting diodes (LED) are semiconductor devices that convert current into light.

A wavelength of light emitted from the respective LEDs is varied according to a semiconductor material used for manufacturing the LED. This is done because a wavelength of the emitted light depends on a band-gap of semiconductor material. The respective band-gaps represent an energy difference between a valence band electrons and conduction band electrons.

As luminance of LEDs is increased recently, the LEDs are being used as light sources for displays, vehicles, and illuminations. Also, LEDs emitting highly efficient white light may be realized by using a fluorescent substance or combining LEDs having various colors.

SUMMARY

Embodiments provide a light emitting device having a new structure, a light emitting device package, and a lighting system.

Embodiments also provide a light emitting device having a coupling force improved between an electrode and an electrode pad, a light emitting device package, and a lighting system.

In one embodiment, a light emitting device comprises: a light emitting structure layer comprising a first conductive type semiconductor layer, a second conductive type semiconductor layer, and an active layer; and an electrode comprising a pad part and a finger part on the light emitting structure layer, wherein the pad part comprises a pattern in which at least one opening is defined, and the finger part comprises a pattern electrically connected to the pad part and linearly extending from the pad part.

In another embodiment, a light emitting device package comprises: a package body; first and second electrode layers on the package body, the first and second electrode layers being electrically separated from each other; a light emitting device on the package body, the light emitting device being electrically connected to the first and second electrode layers; and a molding member surrounding the light emitting device on the main body, wherein the light emitting device comprises: a light emitting structure layer comprising a first conductive type semiconductor layer, a second conductive type semiconductor layer, and an active layer; and an electrode comprising a pad part and a finger part on the light emitting structure layer, wherein the pad part comprises a pattern in which at least one opening is defined, and the finger part comprises a pattern electrically connected to the pad part and linearly extending from the pad part, wherein the light emitting device comprises an electrode pad on the pad part.

In further another embodiment, a lighting system using a light emitting device as a light source comprises: a substrate; and at least one light emitting device on the substrate, wherein the light emitting device comprises: a light emitting structure layer comprising a first conductive type semiconductor layer, a second conductive type semiconductor layer, and an active layer between the first conductive type semiconductor layer and the second conductive type semiconductor layer; and an electrode comprising a pad part and a finger part on the light emitting structure layer, wherein the pad part comprises a pattern in which at least one opening is defined, and the finger part comprises a pattern electrically connected to the pad part and linearly extending from the pad part.

DETAILED DESCRIPTION OF THE EMBODIMENTS

In the descriptions of embodiments, it will be understood that when a layer (or film) is referred to as being ‘on’ another layer or substrate, it can be directly on another layer or substrate, or intervening layers may also be present. Further, it will be understood that when a layer is referred to as being ‘under’ another layer, it can be directly under another layer, and one or more intervening layers may also be present. Further, the reference about ‘on’ and ‘under’ each layer will be made on the basis of drawings.

In the drawings, the thickness or size of each layer is exaggerated, omitted, or schematically illustrated for convenience in description and clarity. Also, the size of each element does not entirely reflect an actual size.

Hereinafter, a light emitting device, a light emitting device package, and a lighting system according to embodiments will be described with reference to accompanying drawings.

A light emitting device includes a light emitting structure layer including a first conductive type semiconductor layer, an active layer, and a second conductive type semiconductor layer. The first conductive type semiconductor layer and the second conductive type semiconductor layer are electrically connected to electrodes for applying a power source.

The first conductive type semiconductor layer may be an N-type semiconductor layer, and the second conductive type semiconductor layer may be a P-type semiconductor layer. On the other hand, the first conductive type semiconductor layer may be the P-type semiconductor layer, and the second conductive type semiconductor layer may be the N-type semiconductor layer.

The light emitting device may include a lateral type light emitting device in which the whole electrodes are exposed to an upward direction of the light emitting structure layer and a vertical type light emitting device in which one of the electrodes is exposed to the upward direction of the light emitting structure layer and the other one is exposed to a downward direction of the light emitting structure layer.

In the light emitting device, the electrodes are disposed on the light emitting structure layer to allow current applied from a wire-bonded electrode pad to widely flow into the semiconductor layer.

FIGS. 1 to 3are views of a light emitting device according to embodiments.

Referring toFIG. 1, a light emitting device includes an un-doped nitride layer20including a buffer layer disposed on a growth substrate10, a light emitting structure layer including a first conductive type semiconductor layer20, an active layer40, and a second conductive type semiconductor layer50, which are disposed on the un-doped nitride layer20, a transparent electrode layer60disposed on the second conductive type semiconductor layer50, a first electrode90disposed on the first conductive type semiconductor layer30, a second electrode disposed on the transparent electrode layer60, and an electrode pad80disposed on the second electrode70.

The growth substrate10may be formed of one of sapphire (Al2O3), Si, SiC, GaAS, ZnO, or MgO. For example, a sapphire substrate may be used as the growth substrate10.

The un-doped nitride layer20may include a GaN-based semiconductor layer. For example, an un-doped GaN layer grown by injecting trimethylgallium (TMGa) gas together with hydrogen gas and ammonia gas into a chamber may be used as the un-doped nitride layer.

For example, the first conductive type semiconductor layer30may include an N-type semiconductor layer. The first conductive type semiconductor layer30may be formed of a semiconductor material having a compositional formula of InxAlyGa1-x-yN (0≦x≦1, 0≦y≦1, 0≦x+y≦1), e.g., InAlGaN, GaN, AlGaN, AlInN, InGaN, AlN, or InN, and doped with an N-type dopant such as Si, Ge, and Sn.

The active layer40is a layer in which electrons (or holes) injected through the first conductive type semiconductor layer30meets with electrons (holes) injected through the second conductive type semiconductor layer50to emit light by a band gap difference of an energy band depending on a formation material of the active layer40.

The active layer40may have a single quantum well structure, a multi quantum well (MQW) structure, a quantum dot structure, or a quantum wire structure, but is not limited thereto.

The active layer40may be formed of a semiconductor material having a compositional formula of InxAlyGa1-x-yN (0≦x≦1, 0≦y≦1, 0≦x+y≦1). When the active layer40has the MQW structure, a plurality of well layers and a plurality of barrier layers may be stacked to form the active layer40. For example, the active layer40may have a stacked structure of InGaN well layer/GaN barrier layer.

A clad layer (not shown) in which an N-type or P-type dopant is doped may be disposed on/under the active layer40. The clad layer (not shown) may be realized by an AlGaN layer or an InAlGaN layer.

For example, the second conductive type semiconductor layer50may be realized by a P-type semiconductor layer. The second conductive type semiconductor layer50may be formed of a semiconductor material having a compositional formula of InxAlyGa1-x-yN (0≦x≦1, 0≦y≦1, 0≦x+y≦1), e.g., InAlGaN, GaN, AlGaN, AlInN, InGaN, AlN, or InN, and doped with a P-type dopant such as Mg, Zn, Ca, Sr, and Ba.

The first conductive type semiconductor layer30may include the P-type semiconductor layer, and the second conductive type semiconductor layer50may include the N-type semiconductor layer. Also, a third conductive type semiconductor layer (not shown) including an N-type or P-type semiconductor layer may be disposed on the second conductive type semiconductor layer50. Thus, the light emitting structure layer may have at least one of an np junction structure, a pn junction structure, an npn junction structure, or a pnp junction structure. Also, impurities may be doped into the first conductive type semiconductor layer30and the second conductive type semiconductor layer50with uniform or ununiform concentration. That is, the light emitting structure layer50may have various structures, but is not limited thereto.

The light emitting structure layer including the first conductive type semiconductor layer30, the active layer40, and the second conductive type semiconductor layer50may have various structures, but is not limited to the structure of the light emitting structure layer exemplified in the embodiment.

The transparent electrode layer60is disposed between the second conductive type semiconductor layer50and the second electrode70to serve as an ohmic contact layer. For example, the transparent electrode layer60may be formed of at least one of ITO, ZnO, RuOx, TiOx, or IrOx.

It is not necessary that the transparent electrode layer60is provided. The second electrode70may be directly disposed on the second conductive type semiconductor layer50. Also, a material serving as the other ohmic contact layer instead of the transparent electrode layer60may be formed.

The second electrode70may have a predetermined pattern shape, and the electrode pad80is disposed on the second electrode70. The pattern of the second electrode70will be described later.

Also, although the second electrode70has the predetermined pattern shape, the electrode pad80is disposed on the second electrode70, and the electrode pad80is connected to an external power source through a wire in the present embodiment, the above-described structure, may also be applied to the first electrode90.

Since the second electrode70has the predetermined pattern in the present embodiment, one portion of the electrode pad80contacts the transparent electrode layer60, and the other portion of the electrode pad80contacts the second electrode70.

Since a contact area between the electrode pad80and the second electrode70is increased by the pattern of the second electrode70, a coupling force between the electrode pad80and the second electrode70may be increased.

A light emitting device ofFIG. 2has a structure similar to that of the light emitting device ofFIG. 1. Thus, descriptions overlapping withFIG. 1will be omitted.

Referring toFIG. 2, the transparent electrode layer is partially disposed on the second conductive type semiconductor layer50, and the second electrode70is disposed on the second conductive type semiconductor layer50and the transparent electrode layer60.

The second electrode70has the predetermined pattern, and the second conductive type semiconductor layer50is partially exposed upward by the pattern of the second electrode70. The electrode pad80is disposed on the second electrode70, and a portion of the electrode pad80contacts the second conductive type semiconductor layer50.

Since a contact area between the second electrode70and the electrode pad80is increased by the pattern of the second electrode70, a coupling force between the electrode pad80and the second electrode70may be increased.

A light emitting device ofFIG. 3includes a vertical type light emitting device, unlike the lateral type light emitting device ofFIGS. 1 and 2.

Referring toFIG. 3, a light emitting device includes a reflective layer120on a conductive support substrate130, an ohmic contact layer110on the reflective layer120, a second conductive type semiconductor layer50on the ohmic contact layer110, an active layer40on the second conductive type semiconductor layer50, a first conductive type semiconductor layer30on the active layer40, a first electrode90on the first conductive type semiconductor layer30, and an electrode pad95on the first electrode90.

The first electrode90has a predetermined pattern, and a portion of the first conductive type semiconductor layer30is partially exposed upward by the pattern. The electrode pad95connected to a wire100is disposed on the first electrode90, and a portion of the electrode pad95contacts the first conductive type semiconductor layer30.

Since a contact area between the first electrode90and the electrode pad95is increased by the pattern of the first electrode90, a coupling force between the electrode pad95and the first electrode90may be increased.

As illustrated inFIGS. 1 to 3, the light emitting device according to the embodiment includes the electrode for applying the power source. Also, the electrode has the predetermined pattern to increase the coupling force between the electrode and the electrode pad.

FIG. 4is a view illustrating an electrode of a light emitting device according to a first embodiment.

Referring toFIG. 4, an electrode230including a pad part210and a finger part220is disposed on a conductive layer200.

The conductive layer200may be a layer for supplying a power source to a first conductive type semiconductor layer or a second, conductive type semiconductor layer. That is, the conductive layer200may be a portion of a light emitting structure layer or a layer electrically connected to the light emitting structure layer. For example, the conductive layer200may include one of the first conductive type semiconductor layer, the second conductive type semiconductor layer, and a transparent electrode layer.

The pad part210has an approximately circular plate-shaped pattern. The finger part220is connected to the pad part210and has a pattern linearly extending from the pad part210. At least one opening219is defined in the pad part210to upwardly expose the conductive layer200through the opening219. According to the present embodiment, a plurality of openings219is defined in the pad part210.

As illustrated inFIGS. 1 to 3, the electrode pad80is disposed on the pad part210. A contact area between an electrode pad80and the pad part210is increased by the pattern of the pad part210to improve a coupling force therebetween.

FIG. 5is a view illustrating an electrode of a light emitting device according to a second embodiment.

In descriptions of the second embodiment, descriptions overlapping with the first embodiment described above will be omitted.

Referring toFIG. 5, an electrode230including a pad part210and a finger part220is disposed on a conductive layer200.

The pad part210has an approximately circular plate-shaped pattern. The finger part220is spaced from the pad part210and has a linearly extending pattern. The finger part220and the pad part210are electrically connected to each other through the conductive layer200. A plurality of openings219is defined in the pad part210to upwardly expose the conductive layer200through the openings219.

As illustrated inFIGS. 1 to 3, the electrode pad80is disposed on the pad part210. A contact area between the electrode pad80and the pad part210is increased by the pattern of the pad part210to improve a coupling force therebetween.

FIG. 6is a view illustrating an electrode of a light emitting device according to a third embodiment.

In descriptions of the third embodiment, descriptions overlapping with the first embodiment described above will be omitted.

Referring toFIG. 6, an electrode230including a pad part210and a finger part220is disposed on a conductive layer200.

The pad part210has a pattern having a concentric circle shape, and the finger part220is connected to the pad part210and has a pattern linearly extending from the pad part210. The pad part210has a shape in which a plurality of concentric circle-shaped patterns connected to each other is arranged, and the pad part210and the finger part220have the same pattern width as each other.

In the present embodiment, the finger part220is provided in plurality, and at least one extends from the pad part210in a direction in which the at least one is at right angles to the other one.

The pad part210includes openings between the plurality of patterns having the concentric circle shape to upwardly expose the conductive layer200through the openings.

As illustrated inFIGS. 1 to 3, the electrode pad80is disposed on the pad part210. A contact area between the electrode pad80and the pad part210is increased by the pattern of the pad part210to improve a coupling force therebetween.

FIG. 7is a view illustrating an electrode of a light emitting device according to a fourth embodiment.

In descriptions of the fourth embodiment, descriptions overlapping with the first embodiment described above will be omitted.

Referring toFIG. 7, an electrode230including a pad part210and a finger part220is disposed on a conductive layer200.

The pad part210has a pattern having a circular plate shape and a pattern having a concentric circle shape. The finger part220is connected to the pad part220and has a pattern linearly extending from the pad part210. The pad part210has a plurality of concentric circle-shaped patterns spaced from each other, and at least portion of the pad part210and the finger part220have the same pattern width as each other.

In the present embodiment, the finger part220is provided in plurality, and at least one of the finger part220extends from the pad part210in a direction in which the at least one is at right angles to the other one.

The pad part210includes openings between the pattern having the circular plate shape and the pattern having the concentric circle shape to upwardly expose the conductive layer200through the openings.

As illustrated inFIGS. 1 to 3, the electrode pad80is disposed on the pad part210. A contact area between the electrode pad80and the pad part210is increased by the pattern of the pad part210to improve a coupling force therebetween.

FIG. 8is a view illustrating an electrode of a light emitting device according to a fifth embodiment.

In descriptions of the fifth embodiment, descriptions overlapping with the first embodiment described above will be omitted.

Referring toFIG. 8, an electrode230including a pad part210and a finger part220is disposed on a conductive layer200.

The pad part210has a pattern having an approximately circular plate shape and a pattern having a concentric circle shape, and the finger part220is connected to the pad part210and has a pattern linearly extending from the pad part210. The pad part210has a plurality of concentric circle-shaped patterns partially connected to each other and a circular plate-shaped pattern. At least portion of the pad part210and the finger part220have the same pattern width as each other.

In the present embodiment, the finger part220is provided in plurality, and at least one extends from the pad part210in a direction in which the at least one is at right angles to the other one.

The pad part210includes openings between the pattern having the concentric circle shape and the pattern having the circular plate shape to upwardly expose the conductive layer200through the openings.

As illustrated inFIGS. 1 to 3, the electrode pad80is disposed on the pad part210. A contact area between the electrode pad80and the pad part210is increased by the pattern of the pad part210to improve a coupling force therebetween.

FIG. 9is a view illustrating an electrode of a light emitting device according to a sixth embodiment.

In descriptions of the sixth embodiment, descriptions overlapping with the first embodiment described above will be omitted.

Referring toFIG. 9, an electrode230including a pad part210and a finger part220is disposed on a conductive layer200.

The pad part210has an approximately circular pattern, and the finger part220is connected to the pad part210and has a pattern linearly extending from the pad part210. The pad part210has the circular pattern, and a portion of the pad part210extends inside the circular pattern.

At least portion of the pad part210and the finger part220have the same pattern width as each other.

In the present embodiment, the finger part220is provided in plurality, and at least one extends from the pad part210in a direction in which the at least one is at right angles to the other one.

The pad part210includes an opening within the circular pattern to upwardly expose the conductive layer200through the opening.

As illustrated inFIGS. 1 to 3, the electrode pad80is disposed on the pad part210. A contact area between the electrode pad80and the pad part210is increased by the pattern of the pad part210to improve a coupling force therebetween.

FIG. 10is a view illustrating an electrode of a light emitting device according to a seventh embodiment.

In descriptions of the seventh embodiment, descriptions overlapping with the first embodiment described above will be omitted.

Referring toFIG. 10, an electrode230including a pad part210and a finger part220is disposed on a conductive layer200.

The pad part210has a plurality of patterns spaced from each other, and at least portion of the patterns has an arc shape. The finger part220is connected to the pad part210and has a pattern linearly extending from the pad part210.

The pad parts210respectively connected to the finger parts220are separated from each other. Also, the pad part210and the finger part220have the same pattern width as each other.

In the present embodiment, the finger part220is provided in plurality, and at least one extends from the pad part210in a direction in which the at least one is at right angles to the other one.

As illustrated inFIGS. 1 to 3, the electrode pad8is disposed on the pad part210. A contact area between the electrode pad80and the pad part210is increased by the pattern of the pad part210to improve a coupling force therebetween.

FIG. 11is a view illustrating an electrode of a light emitting device according to an eighth embodiment.

In descriptions of the eight embodiment, descriptions overlapping with the first embodiment described above will be omitted.

Referring toFIG. 11, an electrode230including a pad part210and a finger part220is disposed on a conductive layer200.

The pad part210has a pattern having a spiral shape. The finger part220is connected to the pad part210and has a pattern linearly extending from the pad part210. Also, the pad part210and the finger part220have the same pattern width as each other.

As illustrated inFIGS. 1 to 3, the electrode pad80is disposed on the pad part210. A contact area between the electrode pad80and the pad part210is increased by the pattern of the pad part210to improve a coupling force therebetween.

FIG. 12is a view of a light emitting device package including the light emitting device according to the embodiments.

Referring toFIG. 12, a light emitting device package600according to an embodiment includes a package body300, first and second electrode layers310and320disposed on the package body300, a light emitting device150disposed on the package body300and electrically connected to the first and second electrode layers310and320, and a molding member500surrounding the light emitting device150.

The package body300may be formed of a silicon material, a synthetic resin material, or a metal material. An inclined surface may be disposed around the light emitting device150.

The first and second electrode layers310and320are electrically separated from each other to supply a power to the light emitting device150. Also, the first and second electrode layers310and320may reflect light generated in the light emitting device150to increase light efficiency. In addition, the first and second electrode layers310and320may discharge heat generated in the light emitting device150.

The light emitting device150may include a lateral type light emitting device or a vertical type light emitting device. Also, the light emitting device150may be disposed on the package body300or the first or second electrode layer310or320.

The light emitting device150may be electrically connected to the first electrode layer310and/or the second electrode layer320through a wire100. Since the vertical-type light emitting device150is described as an example in the embodiment, the embodiment is illustrated to use one wire100as an example. Alternatively, when the light emitting device150includes the lateral type light emitting device as illustrated inFIGS. 1 and 2, two wires100may be used. Also, when the light emitting device150includes a flip chip type light emitting device, the wire100may not be used.

The molding member500may surround the light emitting device150to protect the light emitting device150. Also, a phosphor may be contained in the molding member500to change a wavelength of the light emitted from the light emitting device150.

Since the light emitting device package600uses the light emitting device having superior reliability due to the coupling force improved between the electrode70and the electrode pad80, the light emitting device package600may have superior electrical property and a low defect occurrence rate.

A plurality of light emitting device packages600is arrayed on the substrate. Optical members such as a light guide plate, a prism sheet, a diffusion sheet, and a fluorescence sheet may be disposed on a path of the light emitted from the light emitting device package600. The light emitting device package, the substrate, and the optical member may be functioned as a backlight unit or a light unit. For example, a lighting system may include the backlight unit, the lighting unit, an indicating device, a lamp, and a street lamp.

FIG. 13is a view of a backlight unit using the light emitting device or the light emitting device package according to the embodiments. However, the backlight unit1100ofFIG. 13is an example of a lighting system, and thus the present disclosure is not limited thereto.

Referring toFIG. 13, the backlight unit1100may include a bottom frame1140, a light guide member1120disposed within the bottom frame1140, and a light emitting module1110disposed on at least one side or an under surface of the light guide member1120. Also, a reflective sheet1130may be disposed below the light guide member1120.

The bottom frame1140may have a box shape with an opened upper side to receive the light guide member1120, the light emitting module1110, and the reflective sheet1130. The bottom frame1140may be formed of a metal material or a resin material, but is not limited thereto.

The light emitting module1110may include a substrate700and a plurality of light emitting device packages600mounted on the substrate700. The plurality of light emitting device packages600may provide light to the light guide member1120. In the light emitting module1110according to the embodiment, although the light emitting device package600is disposed on the substrate700as an example, the light emitting device150according to the embodiment may be directly disposed.

As shown inFIG. 13, the light emitting module1110may be disposed on at least one of inner surfaces of the bottom frame1140. Thus, the light emitting module1110may provide light toward at least lateral surface of the light guide member1120.

The light emitting module1110may be disposed on the bottom frame1140to provide light toward an under surface of the light guide member1120. This may be variously varied according to a design of the backlight unit1150, but is not limited thereto.

The light guide member1120may be disposed within the bottom frame1140. The light guide member1120may receive the light provided from the light emitting module1110to produce planar light, and then guide the planar light to a liquid crystal panel (not shown).

For example, the light guide member1120may be a light guide panel (LGP). The LGP may be formed of one of a resin-based material such as polymethylmethacrylate (PMMA), a polyethylene terephthalate (PET) resin, a poly carbonate (PC) resin, a cyclic olefin copolymer (COC) resin, or a polyethylene naphthalate (PEN) resin.

An optical sheet1150may be disposed on the light guide member1120.

For example, the optical sheet1150may include at least one of a diffusion sheet, a light collection sheet, a brightness enhancement sheet, or a fluorescence sheet. For example, the diffusion sheet, the light collection sheet, the brightness enhancement sheet, and the fluorescence sheet may be stacked to form the optical sheet1150. In this case, the diffusion sheet may uniformly diffuse light emitted from the light emitting module1110, and the diffused light may be collected into the display panel (not shown) by the light collection sheet. Here, the light emitted from the light collection sheet is randomly polarized light. The brightness enhancement sheet may enhance a degree of polarization of the light emitted from the light collection sheet. For example, the light collection sheet may be a horizontal and/or vertical prism sheet. Also, the brightness enhancement sheet may be a dual brightness enhancement film. The fluorescence sheet may be a light transmitting plate or film containing a phosphor.

The reflective sheet1130may be disposed under the light guide member1120. The reflective sheet1130reflects the light emitted through the under surface of the light guide member1120toward a light emitting surface of the light guide member1120.

The reflective sheet1130may be formed of a material having superior reflectance, e.g., a PET resin, a PC resin, or a PVC resin, but is not limited thereto.

FIG. 14is a view of a lighting unit using the light emitting device or the light emitting device package according to the embodiments. However, the lighting unit1200ofFIG. 14is an example of the lighting system, and thus the present disclosure is not limited thereto.

Referring toFIG. 14, the lighting unit1200may include a case body1310, a light emitting module1230disposed on the case body1310, a connection terminal1320disposed on the case body1310to receive a power from an external power source.

The case body1310may be formed of a material having good thermal dissipation properties, e.g., a metal material or a resin material.

The light emitting module1230may include a substrate700and at least one light emitting device package600mounted on the substrate700. In the light emitting module1230according to the embodiment, although the light emitting device package600is disposed on the substrate700as an example, the light emitting device150according to the embodiment may be directly disposed.

A circuit pattern may be printed on a dielectric to form the substrate700. For example, the substrate700may include a printed circuit board (PCB), a metal core PCB, a flexible PCB, or a ceramic PCB.

Also, the substrate700may be formed of an effectively reflective material or have a color on which light is effectively reflected from a surface thereof, e.g., a white color or a silver color.

At least one light emitting device package600may be mounted on the substrate700. The light emitting device package600may include at least one light emitting diode (LED). The LED may include colored LEDs, which respectively emit light having a red color, a green color, a blue color, and a white color and an ultraviolet (UV) LED emitting UV rays.

The light emitting module1230may have various combinations of the LED to obtain color impression and brightness. For example, the white LED, the red LED, and the green LED may be combined with each other to secure a high color rendering index (CRI). Also, a fluorescence sheet may be further disposed on a path of light emitted from the light emitting module1230. The fluorescence sheet changes a wavelength of the light emitted from the light emitting module1230. For example, when the light emitted from the light emitting module1230has a blue wavelength band, the fluorescence sheet may include a yellow phosphor. Thus, the light emitted from the light emitting module1230passes through the fluorescence sheet to finally emit white light.

The connection terminal1320may be electrically connected to the light emitting module1230to provide a power to the light emitting module1230. Referring toFIG. 14, the connection terminal1320is screw-coupled to an external power source in a socket manner, but is not limited thereto. For example, the connection terminal1320may have a pin shape, and thus, be inserted into the external power source. Alternatively, the connection terminal1320may be connected to the external power source by a wire.

As described above, in the lighting system, at least one of the light guide member, the diffusion sheet, the light collection sheet, the brightness enhancement sheet, and the fluorescence sheet may be disposed on the path of the light emitted from the light emitting module to obtain a desired optical effect.

Since the lighting system uses the light emitting device having superior reliability due to the coupling force improved between the electrode70and the electrode pad80, the light emitting device package600may have superior electrical property and a low defect occurrence rate.