Light emitting device including multiple light emitting parts

A light emitting device including a first light emitting part including a first n-type semiconductor layer, a first active layer, a first p-type semiconductor layer, and a first transparent electrode, a second light emitting part disposed over the first light emitting part and including a second n-type semiconductor layer, a second active layer, a second p-type semiconductor layer, and a second transparent electrode, and a third light emitting part disposed over the second light emitting part and including a third n-type semiconductor layer, a third active layer, a third p-type semiconductor layer, and a third transparent electrode, in which the light emitting device has substantially a quadrangular shape when viewed from the top, and has first to fourth corners.

BACKGROUND

Field

Exemplary embodiments of the present disclosure relate to a light emitting device, and more particularly, to a light emitting device including a plurality of stacked light emitting layers.

Discussion of the Background

Light emitting diodes, as inorganic light sources, are being diversely used in various fields, such as display devices, vehicle lamps, and general lighting. Light emitting diodes are rapidly replacing existing light sources due to their longer lifetime, lower power consumption, and quicker response speed that conventional light sources.

A display device typically displays various colors by utilizing mixed colors of blue, green, and red. Each pixel of a display device may include blue, green, and red sub-pixels, and the color of a particular pixel may be determined through the colors of the sub-pixels, and an image may be displayed by a combination of pixels.

Light emitting diodes have been mainly used as backlight sources in display devices. However, recently, a micro LED display has been developed as a next generation display, which directly displays images by using light emitting diodes.

SUMMARY

Light emitting devices constructed according to exemplary embodiments of the invention have light, thin, and compact characteristics.

A light emitting device according to an exemplary embodiment includes a first light emitting part including a first n-type semiconductor layer, a first active layer, a first p-type semiconductor layer, and a first transparent electrode, a second light emitting part disposed over the first light emitting part and including a second n-type semiconductor layer, a second active layer, a second p-type semiconductor layer, and a second transparent electrode, a third light emitting part disposed over the second light emitting part and including a third n-type semiconductor layer, a third active layer, a third p-type semiconductor layer, and a third transparent electrode, a first adhesion layer disposed between the first and second light emitting parts and including first coupling patterns that are adhesive and conductive, and a second adhesion layer disposed between the second and third light emitting parts and including second coupling patterns that are adhesive and conductive, in which the third light emitting part has a mesa structure exposing a portion of the second coupling patterns of the second adhesion layer.

The light emitting device may further include a common electrode pad electrically connected to the first, second, and third transparent electrodes, a first electrode pad electrically connected to the first n-type semiconductor layer, a second electrode pad electrically connected to the second n-type semiconductor layer, and a third electrode pad disposed at one corner of the light emitting device and electrically connected to the third n-type semiconductor layer.

Each of the first and second light emitting parts may have a substantially quadrangular shape including first, second, third, and fourth corners respectively corresponding to first, second, third, and fourth corners of the light emitting device, and the third light emitting part may have a substantially quadrangular shape, the third light emitting part having cut portions in areas that correspond to the second and third corners of the light emitting device.

The second coupling patterns may be exposed by the third light emitting part in areas that correspond to the second and third corners of the light emitting device.

The first electrode pad may be disposed between a first outer sidewall of the third light emitting part and an outer sidewall of the second light emitting part, and the second electrode pad may be disposed between a second outer sidewall of the third light emitting part and a second outer sidewall of the second light emitting part.

A length of the third light emitting part between the cut portions may be shorter than a length of the third light emitting part between two opposing corners of the third light emitting part that correspond to the first and fourth corners of the light emitting device.

The light emitting device may further include a first through structure electrically coupling the first, second, and third transparent electrodes with the common electrode pad, a second through structure electrically coupling the first n-type semiconductor layer and the first electrode pad, and a third through structure electrically coupling the second n-type semiconductor layer and the second electrode pad.

The first through structure may include a first through pattern electrically coupling the first transparent electrode and the first coupling pattern, a second through pattern electrically coupling the second transparent electrode and the second coupling pattern, and a third through pattern electrically coupling the third transparent electrode and the common electrode pad.

The first through structure may further include a fourth through pattern electrically coupling the second coupling pattern and the third transparent electrode, the second coupling pattern may be disposed between the second and fourth through patterns to electrically couples the second and fourth through patterns, and the first coupling pattern may be disposed between the first through pattern and the second transparent electrode to electrically couple the first through pattern and the second transparent electrode.

The light emitting device may further include a first insulation layer surrounding an outer sidewall of the second through pattern and extending onto the second n-type semiconductor layer, and a second insulation layer surrounding an outer sidewall of the third through pattern.

The first through pattern may include an upper portion wider than a lower portion thereof, and the first coupling pattern may be connected to the upper portion.

The second through structure may include a first through pattern electrically coupling the first n-type semiconductor layer and a first coupling pattern, a second through pattern electrically coupling the first coupling pattern and a second coupling pattern, and a third through pattern electrically coupling the second coupling pattern and the first electrode pad.

The third through pattern may be disposed between an outer sidewall of the second light emitting part and an outer sidewall of the third light emitting part.

The light emitting device may further include a passivation layer disposed over the second coupling pattern and surrounding the third through pattern, and having a top surface which is coplanar with a top surface of the third n-type semiconductor layer.

The first coupling pattern may include an extension extended toward an outside of the first through pattern, and the second through pattern may be connected to the extension of the first coupling pattern.

A first vertical central axis crossing a center of the first through pattern may be laterally spaced apart from a second vertical central axis crossing a center of the second through pattern.

The third through structure may include a first through pattern electrically coupling the third n-type semiconductor layer and a second coupling pattern, and a second through pattern electrically coupling the second coupling pattern and the second electrode pad.

The second through pattern may be disposed between an outer sidewall of the third light emitting part and an outer sidewall of the second light emitting part.

The light emitting device may further include a passivation layer surrounding the second through pattern over the second coupling pattern and having a top surface which is coplanar with a top surface of the third n-type semiconductor layer.

The first coupling pattern may be disposed at the same elevation as the first adhesion layer, and the second coupling pattern may be disposed at the same elevation as the second adhesion layer.

DETAILED DESCRIPTION

Hereinafter, a light emitting device will be described below with reference to the accompanying drawings through various exemplary embodiments.

FIGS.1A and1Bare top views of light emitting devices according to an exemplary embodiment, andFIG.1Cis a cross-sectional views taken along line A-A′ of the light emitting device ofFIG.1A.

Referring toFIGS.1A through1C, a light emitting device may include a first light emitting part LE1, a second light emitting part LE2, and a third light emitting part LE3, which are vertically stacked on a substrate100.

The substrate100may be capable of growing a gallium nitride-based semiconductor layer thereon, and may include a sapphire (Al2O3), a silicon carbide (SiC), a gallium nitride (GaN), an indium gallium nitride (InGaN), an aluminum gallium nitride (AlGaN), an aluminum nitride (AlN), a gallium oxide (Ga2O3) or silicon. In some exemplary embodiments, the substrate100may be a patterned sapphire substrate.

One surface of the substrate100may be brought into contact with the first light emitting part LE1, and the other surface facing away the one surface may be the light extraction surface of the light emitting device. In some exemplary embodiments, the substrate100may be removed. In this case, one surface of the first light emitting part LE1, which faces the substrate100, may be the light extraction surface of the light emitting device. When the light extraction surface is the other surface of the substrate100or one surface of the first light emitting part LE1, the wavelength of light emitted from the first light emitting part LE1 may be the shortest, the wavelength of light emitted from the second light emitting part LE2 may be longer than the wavelength of the first light emitting part LE1 and shorter than the wavelength of light emitted from the third light emitting part LE3, and the wavelength of light emitted from the third light emitting part LE3 may be the longest. For example, the first light emitting part LE1 may emit blue light, the second light emitting part LE2 may emit green light, and the third light emitting part LE3 may emit red light. However, the inventive concepts are not limited thereto. In some exemplary embodiments, for example, the first light emitting part LE1 may emit light having a wavelength longer than that of the second light emitting part LE2 or the third light emitting part LE3, and the second light emitting part LE2 may emit light having a wavelength longer than that of the third light emitting part LE3. For example, the first light emitting part LE1 may emit green light, the second light emitting part LE2 may emit blue light, and the third light emitting part LE3 may emit red light.

The substrate100may have a substantially quadrangular structure when viewed from the top. Hereinafter, the respective corners of the substantially quadrangular structure may be referred to as a first area AR1, a second area AR2, a third area AR3, and a fourth area AR4. The first light emitting part LE1 and the second light emitting part LE2 may have substantially the same size of light emitting area and similar stack structure, and the third light emitting part LE3 may have a light emitting area having a size smaller than that of the first light emitting part LE1 or the second light emitting part LE2. More particularly, the third light emitting part LE3 may have a mesa structure, in which the corner of each of the second area AR2 and the third area AR3 is etched. As the third light emitting part has the mesa structure, in which each of the second area AR2 and the third area AR3 is cut (e.g., cut portions), the light emitting area of the third light emitting part LE3 may be smaller than that of the light emitting area of the first light emitting part LE1 or the second light emitting part LE2 when viewed from the top. The etched side surface of the third light emitting part LE3 may be an inclined side surface.

According to the illustrated exemplary embodiment shown inFIG.1A, in the third light emitting part LE3, the second area AR2 and the third area AR3 may be neighboring corners. A length DT1 of the third light emitting part LE3 between the second area AR2 and the third area AR3 may be shorter than a length DT2 of the third light emitting part LE3 including the first area AR1 and the fourth area AR4. The length DT1 between the second area AR2 and the third area AR3, and the length DT2 including the first area AR1 and the fourth area AR4 may be defined as shortest distances.

According to another exemplary embodiment shown inFIG.1B, in the third light emitting part LE3, the second area AR2 and the third area AR3 may be opposite corners. A length DT1 of the third light emitting part LE3 between the second area AR2 and the third area AR3 may be shorter than a diagonal length DT2 of the third light emitting part LE3 including the first area AR1 and the fourth area AR4. The length DT1 between the second area AR2 and the third area AR3 and the length DT2 including the first area AR1 and the fourth area AR4 may be defined as shortest distances.

According to an exemplary embodiment, in the second area AR2 and the third area AR3, the outer sidewall of the third light emitting part LE3 may be disposed inwardly with respect to the outer sidewall of the second light emitting part LE2. More particularly, in the second area AR2 and the third area AR3, a fifth coupling pattern314and a sixth coupling pattern316, which will be described later, may be exposed by the outer sidewall of the third light emitting part LE3.

The first light emitting part LE1 may include a first n-type semiconductor layer102, a first active layer104, a first p-type semiconductor layer106, and a first transparent electrode108, which are vertically stacked. The second light emitting part LE2 may include a second transparent electrode208, a second p-type semiconductor layer206, a second active layer204, and a second n-type semiconductor layer202, which are sequentially stacked. The third light emitting part LE3 may include a third transparent electrode308, a third p-type semiconductor layer306, a third active layer304, and a third n-type semiconductor layer302, which are sequentially stacked.

According to an exemplary embodiment, each of the first n-type semiconductor layer102, the second n-type semiconductor layer202, and the third n-type semiconductor layer302may be a Si-doped gallium nitride-based semiconductor layer. Each of the first p-type semiconductor layer106, the second p-type semiconductor layer206, and the third p-type semiconductor layer306may be a Mg-doped gallium nitride-based semiconductor layer. Each of the first active layer104, the second active layer204, and the third active layer304may include a multi-quantum well (MQW), and the composition ratio thereof may be determined to emit light of a desired peak wavelength. Each of the first transparent electrode108, the second transparent electrode208, and the third transparent electrode308may include a transparent oxide layer, such as a zinc oxide (ZnO), indium tin oxide (ITO), zinc-doped indium tin oxide (ZITO), zinc indium oxide (ZIO), gallium indium oxide (GIO), zinc tin oxide (TEO), fluorine-doped tin oxide (FTO), gallium doped zinc oxide (GZO), aluminum-doped zinc oxide (AZO), or others.

The light emitting device may further include a common electrode pad CEL, a first electrode pad EL1, a second electrode pad EL2, and a third electrode pad EL3, which are disposed on the third light emitting part LE3.

The common electrode pad CEL may be electrically coupled with the first p-type semiconductor layer106of the first light emitting part LE1, the second p-type semiconductor layer206of the second light emitting part LE2, and the third p-type semiconductor layer306of the third light emitting part LE3 in the first area AR1. The first electrode pad EL1 may be electrically coupled with the first n-type semiconductor layer102of the first light emitting part LE1 in the second area AR2. The second electrode pad EL2 may be electrically coupled with the second n-type semiconductor layer202of the second light emitting part LE2 in the third area AR3. The third electrode pad EL3 may be electrically coupled with the third n-type semiconductor layer302of the third light emitting part LE3 in the fourth area AR4.

Alternatively, the common electrode pad CEL of the first area AR1 may be electrically coupled with the first n-type semiconductor layer102of the first light emitting part LE1, the second n-type semiconductor layer202of the second light emitting part LE2, and the third n-type semiconductor layer302of the third light emitting part LE3. The first electrode pad EL1 in the second area AR2 may be electrically coupled with the first p-type semiconductor layer106of the first light emitting part LE1, the second electrode pad EL2 in the third area AR3 may be electrically coupled with the second p-type semiconductor layer206of the second light emitting part LE2, and the third electrode pad EL3 in the fourth area AR4 may be electrically coupled with the third p-type semiconductor layer306of the third light emitting part LE3.

On the third light emitting part LE3, a passivation layer PA covering portions where the corner of the second area AR2 and the corner of the third area AR3 in the third light emitting part LE3 are respectively removed may be additionally provided. The passivation layer PA may include one of SiO2, Al2O3, Si3N4, SOG (silicon on glass), epoxy, polyimide, SUB, or BCB (benzo cyclo butene). More particularly, the passivation layer may include an oxide layer or nitride layer including Si.

In an exemplary embodiment, the light emitting device may further include a first color filter CF1, a first adhesion layer AD1, and a second adhesion layer AD2, which are disposed between the first light emitting part LE1 and the second light emitting part LE2, and a second color filter CF2 and a third adhesion layer AD3, which are disposed between the second light emitting part LE2 and the third light emitting part LE3. In some exemplary embodiments, the first color filter CF2 and the second color filter CF2 can be omitted. The first color filter CF1 may be disposed adjacent to the first transparent electrode108of the first light emitting part LE1, and the first adhesion layer AD1 may be disposed on the first color filter CF1. The first adhesion layer AD1 may be bonded with the second adhesion layer AD2 to bond the first light emitting part LE1 and the second light emitting part LE2 to each other. Further, the second color filter CF2 may be disposed adjacent to the third transparent electrode308of the third light emitting part LE3, and the third adhesion layer AD3 may bond the second light emitting part LE2 and the second color filter CF2 to bond the second light emitting part LE2 and the third light emitting part LE3 to each other. In some exemplary embodiments, a fourth adhesion layer may be additionally provided between the second color filter CF2 and the third adhesion layer AD3.

Each of the first color filter CF1 and the second color filter CF2 may include a DBR (distributed Bragg reflector), in which TiO2and SiO2are alternately stacked. For example, the first color filter CF1 and the second color filter CF2 may be different in the composition ratio and alternate stacking order and number of TiO2and SiO2. Each of the first adhesion layer AD1 and the second adhesion layer AD2 may be an insulative and transparent adhesion layer, and include, for example, SOG (silicon on glass), epoxy, polyimide, SUB, or BCB.

The light emitting device may further include a first through structure TVP1, which electrically couples the first transparent electrode108, the second transparent electrode208, and the third transparent electrode308with the common electrode pad CEL. Hereinafter, ‘first,’ ‘second,’ ‘seventh,’ ‘eighth’, and ‘ninth’ are simply used as ordinal numbers for distinguishing patterns, and description order thereof may not be sequentially.

The first through structure TVP1 may include through patterns112,214,310, and320, which pass through the first light emitting part LE1, the second light emitting part LE2, and the third light emitting part LE3, and electrically couple the first transparent electrode108, the second transparent electrode208, and the third transparent electrode308, and coupling patterns116,210, and312, which pass through the first adhesion layer AD1, the second adhesion layer AD2, and the third adhesion layer AD3, and are electrically coupled directly or indirectly through the through patterns112,214,310, and320with the first transparent electrode108, the second transparent electrode208, and the third transparent electrode308.

According to an exemplary embodiment, the first through structure TVP1 may include a first through pattern112, which passes through the first color filter CF1 and is brought into electrical contact with the first transparent electrode108, a first coupling pattern116and a third coupling pattern210, which pass through the first adhesion layer AD1 and the second adhesion layer AD2 are brought into electrical contact with the first through pattern112and the second transparent electrode208, a third through pattern214, which passes through the second p-type semiconductor layer206, the second active layer204, and the second n-type semiconductor layer202and is brought into electrical contact with the second transparent electrode208, a fourth coupling pattern312, which passes through the third adhesion layer AD3 and is brought into electrical contact with the third through pattern214, a sixth through pattern310, which passes through the second color filter CF2 and is brought into electrical contact with the fourth coupling pattern312and the third transparent electrode308, and a seventh through pattern320, which passes through the third p-type semiconductor layer306, the third active layer304, and the third n-type semiconductor layer302and is brought into electrical contact with the third transparent electrode308and the common electrode pad CEL. According to an exemplary embodiment, the first color filter CF1 may surround the outer sidewall of the first through pattern112. The second color filter CF2 may surround the outer sidewall of the sixth through pattern310.

Each of the first through pattern112, the third through pattern214, the sixth through pattern310, and the seventh through pattern320of the first through structure TVP1 may include at least one of Ti, Ni, Au, Cr, Cu, TiW, or Mo. Each of the first coupling pattern116, the third coupling pattern210, and the fourth coupling pattern312of the first through structure TVP1 may include metal having low melting temperature, such as Sn or In, which also has an adhesion property and an electrical conductivity. When the first coupling pattern116and the third coupling pattern210include substantially the same material, the first coupling pattern116and the third coupling pattern210may not be distinguished from each other. Each of the first through pattern112, the third through pattern214, and the seventh through pattern320may have an inclined side surface such that a width thereof gradually decreases in a downward direction. The sixth through pattern310may have an inclined side surface such that a width thereof gradually increases in the downward direction.

According to an exemplary embodiment, one surface of the first through pattern112is brought into electrical contact with the first transparent electrode108, and the other surface of the first through pattern112may be electrically coupled with the second transparent electrode208through the first coupling pattern116and the third coupling pattern210. The second transparent electrode208may be brought into electrical contact with one surface of the third through pattern214, and the other surface of the third through pattern214may be brought into electrical contact with the fourth coupling pattern312. The fourth coupling pattern312may be electrically coupled with one surface of the third transparent electrode308through the sixth through pattern310. The other surface of the third transparent electrode308may be brought into electrical contact with the common electrode pad CEL by the seventh through pattern320. In this case, the first transparent electrode108, the second transparent electrode208, and the third transparent electrode308may not be etched, and may be electrically coupled with one another through the through patterns and the coupling patterns, which pass through the first light emitting part LE1, the first adhesion layer AD1, the second adhesion layer AD2, the second light emitting part LE2, the third adhesion layer AD3, and the third light emitting part LE3. In this manner, since contact areas through which the first transparent electrode108, the second transparent electrode208, and the third transparent electrode308are brought into contact with the through patterns112,214,310, and320, or the coupling patterns116,210, and312may be increased, the electrical reliability of the light emitting device may be improved.

In the first through structure TVP1, the first through pattern112may be disposed to be aligned with the first transparent electrode108in the first area AR1, and the first coupling pattern116may be disposed to be aligned with the first through pattern112. The third through pattern214may be disposed to be aligned with the second transparent electrode208in the first area AR1, and be aligned with the first coupling pattern116in the first area AR1. The fourth coupling pattern312may be disposed to be aligned with the third through pattern214, and the sixth through pattern310may be disposed to be aligned with the fourth coupling pattern312. The seventh through pattern320may be disposed to be aligned with the third transparent electrode308in the first area AR1, and be aligned with a position where the common electrode pad CEL is to be formed.

The light emitting device may further include a second insulation layer212, which is surrounds the outer sidewall of the third through pattern214. The second insulation layer212may insulate the second n-type semiconductor layer202, the second active layer204, and the second p-type semiconductor layer206from the third through pattern214. The second insulation layer212may include, for example, SiO2or Si3N4, which has high light transmittance and an electrical insulation property. The second insulation layer212may extend onto the second n-type semiconductor layer202as shown in the drawings, however, in some exemplary embodiments, the second insulation layer212may surround only the outer sidewall of the third through pattern214.

The light emitting device may further include a third insulation layer318, which surrounds the outer sidewall of the seventh through pattern320. The third insulation layer318may insulate the third n-type semiconductor layer302, the third active layer304, and the third p-type semiconductor layer306from the seventh through pattern320. The third insulation layer318may include, for example, SiO2or Si3N4, which have high light transmittance and an electrical insulation property. While the third insulation layer318is illustrated as surrounding only the outer sidewall of the seventh through pattern320, however, in some exemplary embodiments, the third insulation layer318may extend onto the third n-type semiconductor layer302.

The light emitting device may further include a second through structure TVP2, which is electrically coupled with the first n-type semiconductor layer102in the second area AR2.

The second through structure TVP2 may include through patterns114,216, and322, which are electrically coupled with the first n-type semiconductor layer102of the first light emitting part LE1 and pass through the first light emitting part LE1, the second light emitting part LE2, the third light emitting part LE3, the first adhesion layer AD1, the second adhesion layer AD2, and the third adhesion layer AD3. The second through structure TVP2 may further include coupling patterns118and314, which are electrically coupled with the through patterns114,216, and322.

According to an exemplary embodiment, the second through structure TVP2 may include a second through pattern114, which passes through the first active layer104, the first p-type semiconductor layer106, the first transparent electrode108, and the first color filter CF1 and is brought into electrical contact with the first n-type semiconductor layer102, a second coupling pattern118, which passes through the first adhesion layer AD1 and is brought into electrical contact with the second through pattern114, a fourth through pattern216, which passes through the second adhesion layer AD2, the second transparent electrode208, the second p-type semiconductor layer206, the second active layer204, and the second n-type semiconductor layer202and is brought into electrical contact with the second coupling pattern118, a fifth coupling pattern314, which passes through the third adhesion layer AD3 and is brought into electrical contact with the fourth through pattern216, and an eighth through pattern322, which passes through the third transparent electrode308, the third p-type semiconductor layer306, the third active layer304, the third n-type semiconductor layer302, and the passivation layer PA and is brought into electrical contact with the fifth coupling pattern314and the first electrode pad ELL According to an exemplary embodiment, in the second area AR2, the eighth through pattern322may be disposed between the outer sidewall of the third light emitting part LE3 and the outer sidewall of the second light emitting part LE2. The first color filter CF1 may surround the outer sidewall of the second through pattern114.

Each of the second through pattern114, the fourth through pattern216, and the eighth through pattern322of the second through structure TVP2 may include at least one of Ti, Ni, Au, Cr, Cu, TiW or Mo. Each of the second coupling pattern118and the fifth coupling pattern314of the second through structure TVP2 may include metal having low melting temperature, such as Sn or In, which also has an adhesion property and an electrical conductivity.

In the second through structure TVP2, the second through pattern114may be aligned with the first n-type semiconductor layer102in the second area AR2, and the second coupling pattern118may be aligned with the second through pattern114. The fourth through pattern216may be aligned with the second coupling pattern118, and the fifth coupling pattern314may be aligned with the fourth through pattern216. The eighth through pattern322may be disposed to be aligned with the fifth coupling pattern314and the first electrode pad ELL

According to another exemplary embodiment, as shown inFIG.1C, each of the second through pattern114, the fourth through pattern216, and the eighth through pattern322of the second through structure TVP2 may have an inclined side surface such that a width thereof gradually decreases in the downward direction. According to the exemplary embodiment shown inFIG.1D, each of the second through pattern114, the fourth through pattern216, and the eighth through pattern322of the second through structure TVP2 may have a stepped side surface, such that a width thereof decreases in the downward direction. For example, the second through pattern114may include a first portion, which passes through the first active layer104and the first p-type semiconductor layer106, a second portion which has a width greater than the first portion and passes through the first transparent electrode108, and a third portion which has a width greater than the second portion and passes through the first color filter CF1. The fourth through pattern216may include a first portion disposed in the second adhesion layer AD2, a second portion which has a width greater than the first portion and passes through the second transparent electrode208, and a third portion which has a width greater than the second portion and passes through the second p-type semiconductor layer206, the second active layer204, and the second n-type semiconductor layer202. Each of the second through pattern114, the fourth through pattern216, and the eighth through pattern322may be formed to have a side surface with a stepped structure, because since layers formed of different components are etched, the etching selectivity of the layers formed of the different components may be different depending on the type of an etching process or an etchant.

The light emitting device may further include a first insulation layer110, which surrounds the outer sidewall of the second through pattern114. The first insulation layer110may insulate the second through pattern114from the first active layer104, the first p-type semiconductor layer106, and the first transparent electrode108. In some exemplary embodiments, the first insulation layer110may extend onto the first color filter CF1 and surround the side surface of the first through pattern112. In this case, since the first color filter CF1 includes an insulation material, the first insulation layer110may not surround the side surface of the first through pattern112. The first insulation layer110may include, for example, SiO2, Al2O3, Si3N4, or others, which has high light transmittance and an electrical insulation property. Also, the second insulation layer212may surround the outer sidewall of the third through pattern214in the first area AR1, extend on the second n-type semiconductor layer202, and surround the outer sidewall of the fourth through pattern216in the second area AR2.

The light emitting device may further include a third through structure TVP3, which is electrically coupled with the second n-type semiconductor layer202in the third area AR3.

The third through structure TVP3 may include through patterns218and324, which are electrically coupled with the second n-type semiconductor layer202of the second light emitting part LE2 and pass through the third light emitting part LE3 and a portion of the second light emitting part LE2, and a sixth coupling pattern316which passes through the third adhesion layer AD3 bonding the second light emitting part LE2 and the third light emitting part LE3 and is electrically coupled with the through patterns218and324.

According to an exemplary embodiment, the third through structure TVP3 may include a fifth through pattern218which is brought into electrical contact with the second n-type semiconductor layer202, the sixth coupling pattern316which is brought into electrical contact with the fifth through pattern218and passes through the third adhesion layer AD3, and a ninth through pattern324which passes through the third transparent electrode308, the third p-type semiconductor layer306, the third active layer304, the third n-type semiconductor layer302, and the passivation layer PA and is brought into electrical contact with the sixth coupling pattern316and the second electrode pad EL2. According to an exemplary embodiment, in the third area AR3, the ninth through pattern324may be disposed between the outer sidewall of the third light emitting part LE3 and the outer sidewall of the second light emitting part LE2.

Each of the fifth through pattern218and the ninth through pattern324of the third through structure TVP3 may include at least one of Ti, Ni, Au, Cr, Cu, TiW, or Mo. The sixth coupling pattern316of the third through structure TVP3 may include metal having low melting temperature, such as Sn or In, which also has an adhesion property and an electrical conductivity. Each of the fifth through pattern218and the ninth through pattern324may have a inclined side surface such that a width thereof gradually decreases in the downward direction.

In the third through structure TVP3, the fifth through pattern218may be aligned with the second n-type semiconductor layer202in the third area AR3, and the sixth coupling pattern316may be aligned with the fifth through pattern218. The ninth through pattern324may be disposed to be aligned with the sixth coupling pattern316and the second electrode pad EL2.

The second insulation layer212may surround the outer sidewall of the third through pattern214in the first area AR1, surround the outer sidewall of the fourth through pattern216in the second area AR2, extend to the second n-type semiconductor layer202and surround an upper portion of the outer sidewall of the fifth through pattern218in the third area AR3.

In the fourth area AR4, the third electrode pad EL3 may be brought into electrical contact directly with the third n-type semiconductor layer302, without forming a through pattern or a coupling pattern on the third n-type semiconductor layer302of the third light emitting part LE3.

In this manner, by the plurality of through patterns112,114,214,216,218,310,320,322, and324, which pass through the first light emitting part LE1, the second light emitting part LE2, and the third light emitting part LE3, and the coupling patterns116,118,210,312,314, and316, which pass through the first adhesion layer AD1, the second adhesion layer AD2, and the third adhesion layer AD3 and have electrical conductivities, the common electrode pad CEL, the first electrode pad EL1, the second electrode pad EL2, and the third electrode pad EL3 may be coupled to the first light emitting part LE1, the second light emitting part LE2, and the third light emitting part LE3, which are vertically stacked. In this manner, since the common electrode pad CEL, the first electrode pad EL1, the second electrode pad EL2, and the third electrode pad EL3 of a light emitting device are coupled to the first light emitting part LE1, the second light emitting part LE2, and the third light emitting part LE3, without etching every light emitting parts to form through patterns therein, the light emitting area of the light emitting device according to the illustrated exemplary embodiment may be formed larger. Moreover, as compared to a case where through via patterns, which vertically pass through the first light emitting part LE1, the second light emitting part LE2, and the third light emitting part LE3, and the common electrode pad CEL, the first electrode pad EL1, the second electrode pad EL2, and the third electrode pad EL3 are coupled to the first light emitting part LE1, the second light emitting part LE2, and the third light emitting part LE3, the degree of difficulty in processing the light emitting device, for example, the degree of difficulty in an etching process for forming contact vias and the degree of difficulty in a deposition process for filling contact vias due to a large aspect ratio of etched contact vias, may be reduced, and thus, the manufacture of the light emitting device according to the illustrated exemplary embodiment may be facilitated.

FIG.2is a cross-sectional view of a light emitting device according to another exemplary embodiment.

Referring toFIG.2, a light emitting device may include a first light emitting part LE1, a second light emitting part LE2, and a third light emitting part LE3, which are vertically stacked.

The first light emitting part LE1 may include a first n-type semiconductor layer102, a first active layer104, a first p-type semiconductor layer106, and a first transparent electrode108, which are vertically stacked. The second light emitting part LE2 may include a second transparent electrode208, a second p-type semiconductor layer206, a second active layer204, and a second n-type semiconductor layer202, which are sequentially stacked. The third light emitting part LE3 may include a third transparent electrode308, a third p-type semiconductor layer306, a third active layer304, and a third n-type semiconductor layer302, which are sequentially stacked.

The light emitting device may further include a common electrode pad CEL, which is electrically coupled with the first p-type semiconductor layer106of the first light emitting part LE1, the second p-type semiconductor layer206of the second light emitting part LE2, and the third p-type semiconductor layer306of the third light emitting part LE3 in a first area AR1, a first electrode pad EL1 which is electrically coupled with the first n-type semiconductor layer102of the first light emitting part LE1 in a second area AR2, a second electrode pad EL2 which is electrically coupled with the second n-type semiconductor layer202of the second light emitting part LE2 in a third area AR3, and a third electrode pad EL3 which is electrically coupled with the third n-type semiconductor layer302of the third light emitting part LE3 in a fourth area AR4.

The light emitting device may further include a first color filter CF1 and a first adhesion layer AD1, which are disposed between the first light emitting part LE1 and the second light emitting part LE2, and a second color filter CF2 and a second adhesion layer AD2, which are disposed between the second light emitting part LE2 and the third light emitting part LE3.

The light emitting device may further include a first through structure TVP1, which includes a first through pattern112, a first coupling pattern116, a third coupling pattern210, a third through pattern214, a fourth coupling pattern312, a sixth through pattern310, and a seventh through pattern320in the first area AR1, a second through structure TVP2 which includes a second through pattern114, a second coupling pattern118, a fourth through pattern216, a fifth coupling pattern314, and an eighth through pattern322in the second area AR2, and a third through structure TVP3 which includes a fifth through pattern218, a sixth coupling pattern316and a ninth through pattern324in the third area AR3. The light emitting device may further include a first insulation layer110, a second insulation layer212, and a third insulation layer318.

The first through pattern112of the first through structure TVP1 may include a first portion which is disposed in the first color filter CF1, and a second portion which has a width greater than the first portion and extends onto the first color filter CF1. By the second portion of the first through pattern112, a margin for aligning the first coupling pattern116with the first through pattern112may be increased.

The third through pattern214of the first through structure TVP1 may include a first portion which is disposed in the second p-type semiconductor layer206, the second active layer204, the second n-type semiconductor layer202, and the second insulation layer212, and a second portion which has a width greater than the first portion and extends onto the second insulation layer212. By the second portion of the third through pattern214, a margin for aligning the fourth coupling pattern312with the third through pattern214may be increased.

Further, a vertical central axis crossing a center of the first through pattern112may be laterally spaced apart from a vertical central axis crossing a center of the third through pattern214. A vertical central axis crossing a center of the sixth or seventh through pattern310or312may be laterally spaced apart from the vertical central axis crossing a center of the third through pattern214. The vertical central axis crossing the center of the sixth or seventh through pattern310or312may be consistent with or laterally spaced apart from the vertical central axis crossing the center of the first through pattern112.

The second through pattern114of the second through structure TVP2 may include a first portion which is disposed in the first active layer104, the first p-type semiconductor layer106, the first transparent electrode108, and the first color filter CF1, and a second portion which has a width greater than the first portion and extends onto the first color filter CF1. By the second portion of the second through pattern114, a margin for aligning the second coupling pattern118with the second through pattern114may be increased. The second coupling pattern118may be in contact with the second portion of the second through pattern114and be extended toward an outside of the second portion.

The fourth through pattern216of the second through structure TVP2 may include a first portion which is disposed in the second adhesion layer AD2, the second transparent electrode208, the second p-type semiconductor layer206, the second active layer204, the second n-type semiconductor layer202, and the second insulation layer212, and a second portion which has a width greater than the first portion and extends onto the second insulation layer212. By the second portion of the fourth through pattern216, a margin for aligning the fifth coupling pattern314with the fourth through pattern216may be increased.

As shown inFIG.2, the first portion of the fourth through pattern216may be spaced apart from the first portion of the second through pattern114. The first portion of the fourth through pattern216may be electrically connected to the extension of the second coupling pattern118. Accordingly, a vertical central axis crossing a center of the second through pattern114may be laterally spaced apart from a vertical central axis crossing a center of the fourth through pattern216. A vertical central axis crossing a center of the eighth through pattern322may be consistent with or laterally spaced apart from a vertical central axis crossing the center of the second through pattern114.

In some exemplary embodiments, each of the fifth through pattern218and the sixth through pattern310may have an upper portion and lower portion which has a greater width, and thus, a coupling margin for a coupling pattern to be stacked on the upper portion may be increased.

Since the light emitting device ofFIG.2includes components substantially the same as those of the light emitting device shown inFIGS.1A to1D, repeated descriptions thereof will be omitted.

FIG.3is a cross-sectional view of a light emitting device according to yet another exemplary embodiment.

Referring toFIG.3, a light emitting device may include a first light emitting part LE1, a second light emitting part LE2, and a third light emitting part LE3, which are vertically stacked.

The first light emitting part LE1 may include a first n-type semiconductor layer102, a first active layer104, a first p-type semiconductor layer106, and a first transparent electrode108, which are vertically stacked. The second light emitting part LE2 may include a second transparent electrode208, a second p-type semiconductor layer206, a second active layer204, and a second n-type semiconductor layer202, which are sequentially stacked. The third light emitting part LE3 may include a third transparent electrode308, a third p-type semiconductor layer306, a third active layer304, and a third n-type semiconductor layer302, which are sequentially stacked.

The light emitting device may further include a common electrode pad CEL which is electrically coupled with the first p-type semiconductor layer106of the first light emitting part LE1, the second p-type semiconductor layer206of the second light emitting part LE2, and the third p-type semiconductor layer306of the third light emitting part LE3 in a first area AR1, a first electrode pad EL1 which is electrically coupled with the first n-type semiconductor layer102of the first light emitting part LE1 in a second area AR2, a second electrode pad EL2 which is electrically coupled with the second n-type semiconductor layer202of the second light emitting part LE2 in a third area AR3, and a third electrode pad EL3 which is electrically coupled with the third n-type semiconductor layer302of the third light emitting part LE3 in a fourth area AR4.

The light emitting device may further include a first color filter CF1 and a first adhesion layer AD1, which are disposed between the first light emitting part LE1 and the second light emitting part LE2, and a second color filter CF2 and a second adhesion layer AD2, which are disposed between the second light emitting part LE2 and the third light emitting part LE3.

The light emitting device may further include a first through structure TVP1 which includes a first through pattern112, a first coupling pattern116, a third coupling pattern210, a third through pattern214, a fourth coupling pattern312, a sixth through pattern310, and a seventh through pattern320in the first area AR1, a second through structure TVP2 which electrically couples the first n-type semiconductor layer102and the first electrode pad EL1 in the second area AR2, and a third through structure TVP3 which electrically couples the second n-type semiconductor layer202and the second electrode pad EL2 in the third area AR3.

The light emitting device may further include a second insulation layer212, a third insulation layer318, and a fourth insulation layer326.

The second insulation layer212may surround the outer sidewall of the third through pattern214and extend onto the second n-type semiconductor layer202. The third insulation layer318may surround the outer sidewall of the seventh through pattern320. The fourth insulation layer326may surround the outer sidewall of the second through structure TVP2. The fourth insulation layer326may insulate the first active layer104, the first p-type semiconductor layer106, the first transparent electrode108, the second transparent electrode208, the second p-type semiconductor layer206, the second active layer204, and the second n-type semiconductor layer202from the second through structure TVP2.

Since the first through structure TVP1 electrically couples one surfaces and the other surfaces of the first transparent electrode108, the second transparent electrode208, and the third transparent electrode308through the plurality of through patterns112,214,310, and320, and the plurality of coupling patterns116,210and312, without etching the first transparent electrode108, the second transparent electrode208, and the third transparent electrode308, areas through which the first transparent electrode108, the second transparent electrode208, and the third transparent electrode308are brought into contact with the through patterns112,214,310, and320and the coupling patterns116,210, and312may be increased, whereby electrical resistance may be reduced. On the other hand, since the second through structure TVP2 and the third through structure TVP3 directly couple the first n-type semiconductor layer102with the first electrode pad EL1 and the second n-type semiconductor layer202with the second electrode pad EL2 without using through patterns and coupling patterns, manufacturing processes may be simplified.

Since the light emitting device ofFIG.3includes components substantially the same as those of the light emitting device shown inFIGS.1A to1D, repeated descriptions thereof will be omitted.

FIGS.4to19are cross-sectional views illustrating a method for manufacturing a light emitting device according to an exemplary embodiment. Hereinafter, the manufacturing method will be exemplarily described with reference to the light emitting device ofFIGS.1A and1C, however, the inventive concepts are not limited thereto.

Referring toFIG.4, a first n-type semiconductor layer102, a first active layer104, a first p-type semiconductor layer106, and a first transparent electrode108may be sequentially formed on a substrate100to form a first light emitting part LE1. A first color filter CF1 may be formed on the first light emitting part LE1.

The substrate100may include a first area AR1, a second area AR2, a third area AR3, and a fourth area AR4. For example, the substrate100may have a substantially quadrangular structure when viewed from the top, and the first area AR1, the second area AR2, the third area AR3, and the fourth area AR4 may respectively correspond to the corner portions of the substrate100.

The first n-type semiconductor layer102, the first active layer104, and the first p-type semiconductor layer106may be sequentially grown on the substrate100through a process, such as metal organic chemical vapor deposition (MOCVD) or molecular beam epitaxy (MBE). Then, the first transparent electrode108may be formed on the first p-type semiconductor layer106by using chemical vapor deposition (CVD) or the like. The first color filter CF1 may be formed on the first transparent electrode108by using CVD, for example.

Referring toFIG.5, by etching the first color filter CF1 and the first light emitting part LE1, a first hole H1 may be formed in the first area AR1 and a second hole H2 may be formed in the second area AR2. The first hole H1 may expose the first transparent electrode108, and the second hole H2 may expose the first n-type semiconductor layer102.

Then, a pre-first insulation layer may be conformally formed on the first color filter CF1 formed with the first hole H1 and the second hole H2, continuously along the surfaces of the first color filter CF1 and the first light emitting part LE1, while not completely filling the first hole H1 and the second hole H2. By etching the pre-first insulation layer, a first insulation layer110disposed on the inner sidewall of the first hole H1 may be formed.

In some exemplary embodiments, the first insulation layer110may also be formed on the inner sidewall of the first hole H1. However, when the first color filter CF1 includes an insulating material, the first insulation layer110may or may not be formed in the first hole H1.

Referring toFIG.6, a first through pattern112and a second through pattern114, which fill the first hole H1 and the second hole H2, respectively, may be formed.

In particular, a first conductive layer may be formed on the first insulation layer110, the first color filter CF1, and the first light emitting part LE1, which are formed with the first hole H1 and the second hole H2, to substantially fill the first hole H1 and the second hole H2. The first conductive layer may include at least one of Ti, Ni, Au, Cr, Cu, TiW, or Mo.

By etching the first conductive layer, such that the surface of the first color filter CF1 is exposed, the first through pattern112substantially filling (or burying) the first hole H1 and the second through pattern114substantially filling the second hole H2 may be formed. The first through pattern112may be formed in the first area AR1, and the second through pattern114may be formed in the second area AR2.

Referring toFIG.7, a first adhesion layer AD1 including a first coupling pattern116aligned with the first through pattern112and a second coupling pattern118aligned with the second through pattern114may be formed.

In particular, a pre-first adhesion layer may be formed on the first color filter CF1 formed with the first through pattern112and the second through pattern114. The pre-first adhesion layer may be formed by using a spin coating process, for example, which may include SOG (spin on glass), epoxy, polyimide, SUB, BCB, or others. By etching the pre-first adhesion layer, the first adhesion layer AD1 having a first opening exposing the first through pattern112and a second opening exposing the second through pattern114may be formed. A second conductive layer may be formed on the first adhesion layer AD1. The second conductive layer may include a metallic material having a low melting temperature, an adhesion property, and an electrical conductivity, for example, such Sn or In. By etching the second conductive layer, such that the surface of the first adhesion layer AD1 is exposed, the first coupling pattern116and the second coupling pattern118may be respectively formed. The first coupling pattern116may be formed in the first area AR1, and the second coupling pattern118may be formed in the second area AR2.

Referring toFIG.8, a second n-type semiconductor layer202, a second active layer204, and a second p-type semiconductor layer206may be sequentially formed on a second substrate200by using MOCVD or MBE, and a second transparent electrode208may be formed on the second p-type semiconductor layer206by using a PVD, CVD, sol-gel, or hydrothermal synthesis method to form a second light emitting part LE2.

Referring toFIG.9, a second adhesion layer AD2 including a third coupling pattern210may be formed on the second transparent electrode208. In particular, a pre-second adhesion layer may be formed on the second transparent electrode208by using a spin coating process or the like. For example, the pre-second adhesion layer may include SOG, epoxy, polyimide, SUB, BCB, or others. By etching the pre-second adhesion layer, the second adhesion layer AD2 including a third opening may be formed. A third conductive layer may be formed on the second adhesion layer AD2 to substantially fill the third opening. The third conductive layer may include a material having low melting temperature, an adhesion property, and an electrical conductivity, for example, such as Sn or In. By etching the third conductive layer up to the exposed top surface of the second adhesion layer AD2, the third coupling pattern210substantially filling the third opening may be formed.

Then, the second substrate200may be turned over such that the second adhesion layer AD2 including the third coupling pattern210faces downward direction. Then, the second substrate200may be removed by laser lift-off or the like.

Referring toFIG.10, by bonding the first adhesion layer AD1 formed on the first light emitting part LE1 and the second adhesion layer AD2 formed on the second light emitting part LE2, the first light emitting part LE1 and the second light emitting part LE2 may be bonded with each other. When each of the first adhesion layer AD1 and the second adhesion layer AD2 includes SOG, by performing thermo-compression after bringing the first adhesion layer AD1 and the second adhesion layer AD2 into contact with each other, the first adhesion layer AD1 and the second adhesion layer AD2 may be bonded with each other. The first coupling pattern116in the first area AR1 may be bonded with the third coupling pattern210, and the second coupling pattern118in the second area AR2 may be bonded with the second adhesion layer AD2.

Then, a third hole H3 and a fourth hole H4 may be formed to expose the second transparent electrode208and the second coupling pattern118, respectively. In particular, by etching the second n-type semiconductor layer202, the second active layer204, and the second p-type semiconductor layer206in the first area AR1, the third hole H3 which exposes the second transparent electrode208may be formed. By etching the second n-type semiconductor layer202, the second active layer204, the second p-type semiconductor layer206, the second transparent electrode208, and the second adhesion layer AD2 in the second area AR2, the fourth hole H4 which exposes the second coupling pattern118may be formed.

Referring toFIG.11, a second insulation layer212may be formed on a top surface of the second light emitting part LE2. In this case, the second insulation layer212may be disposed on sidewalls that define the third hole H3 and the fourth hole H4. Then, a fifth hole H5 may be formed in the third area AR3 to expose the second n-type semiconductor layer202.

Referring toFIG.12, a third through pattern214, a fourth through pattern216, and a fifth through pattern218, which substantially fill the third hole H3, the fourth hole H4, and the fifth hole H5 may be respectively formed.

In particular, a fourth conductive layer may be formed on the second insulation layer212to substantially fill the third hole H3, the fourth hole H4, and the fifth hole H5. The fourth conductive layer may include at least one of Ti, Ni, Au and Cr. By etching the fourth conductive layer to expose the surface of the second insulation layer212, the third through pattern214which substantially fills the third hole H3, the fourth through pattern216which substantially fills the fourth hole H4, and the fifth through pattern218which substantially fills the fifth hole H5 may be respectively formed. The third through pattern214may be formed in the first area AR1, the fourth through pattern216may be formed in the second area AR2, and the fifth through pattern218may be formed in the third area AR3.

Referring toFIG.13, a third n-type semiconductor layer302, a third active layer304, and a third p-type semiconductor layer306may be sequentially formed on a third substrate300by using MOCVD or MBE, and a third transparent electrode308may be formed on the third p-type semiconductor layer306by using CVD or the like to form a pre-third light emitting part. Then, a second color filter CF2 may be formed on the pre-third light emitting part.

Referring toFIG.14, the second color filter CF2 is etched to form a sixth hole H6 which exposes the third transparent electrode308in the first area AR1, a fifth conductive layer substantially filling the sixth hole H6 may be formed. The fifth conductive layer may include at least one of Ti, Ni, Au and Cr. By etching the fifth conductive layer to expose the surface of the second color filter CF2, a sixth through pattern310substantially filling the sixth hole H6 may be formed.

Referring toFIG.15, a pre-third adhesion layer may be formed on the second color filter CF2, by using a spin coating process or the like. The pre-third adhesion layer may include SOG.

After forming a fourth opening exposing the sixth through pattern310in the first area AR1, a fifth opening exposing the second color filter CF2 in the second area AR2, and a sixth opening exposing the second color filter CF2 in the third area AR3, by etching the pre-third adhesion layer, a sixth conductive layer may be formed on the second color filter CF2 to substantially fill the fourth opening, the fifth opening, and the sixth opening. The sixth conductive layer may include metal having a low melting temperature, such as Sn or In.

By etching the sixth conductive layer to expose the second color filter CF2, a fourth coupling pattern312substantially filling the fourth opening, a fifth coupling pattern314substantially filling the fifth opening, and a sixth coupling pattern316substantially filling the sixth opening may be respectively formed. The fourth coupling pattern312may be formed in the first area AR1, the fifth coupling pattern314may be formed in the second area AR2, and the sixth coupling pattern316may be formed in the third area AR3.

The third substrate300may be removed through a laser lift-off process or the like. Then, the third light emitting part LE3 may be turned over, such that the third adhesion layer AD3 may face downward direction.

Referring toFIG.16, a seventh hole H7 exposing the third transparent electrode308may be formed by etching the third n-type semiconductor layer302, the third active layer304, and the third p-type semiconductor layer306in the first area AR1. Then, a pre-third insulation layer may be conformally formed continuously along the surface of the pre-third light emitting part so as not to completely fill the seventh hole H7. By etching the pre-third insulation layer, a third insulation layer318disposed on the inner sidewall of the seventh hole H7 may be formed.

A seventh conductive layer may be formed on the third n-type semiconductor layer302to substantially fill the seventh hole H7 formed in the third insulation layer318. The seventh conductive layer may include at least one of Ti, Ni, Au, and Cr. By etching the seventh conductive layer to expose the surface of the third n-type semiconductor layer302, a seventh through pattern320substantially filling the seventh hole H7 may be formed.

Referring toFIG.17, by etching the pre-third light emitting part, a third light emitting part LE3 having a mesa structure may be formed. By removing the corners, which are respectively positioned in the second area AR2 and the third area AR3, the third light emitting part LE3 including a mesa structure that exposes the fifth coupling pattern314and the sixth coupling pattern316may be formed.

Referring toFIG.18, a passivation layer PA, which covers the fifth coupling pattern314and the sixth coupling pattern316, may be formed on the third adhesion layer AD3 and the third light emitting part LE3. The passivation layer PA may be etched to expose the surface of the third light emitting part LE3.

Referring toFIG.19, an eighth hole exposing the fifth coupling pattern314and a ninth hole exposing the sixth coupling pattern316may be formed by etching the passivation layer PA. Then, an eighth conductive layer may be formed on the passivation layer PA to substantially fill the eight hole and the ninth hole. The eighth conductive layer may include at least one of Ti, Ni, Au, and Cr. By etching the eighth conductive layer to expose the surface of the passivation layer PA, an eighth through pattern322substantially filling the eighth hole and a ninth through pattern324substantially filling the ninth hole H9 may be respectively formed. The eighth through pattern322may be formed in the second area AR2, and the ninth through pattern324may be formed in the third area AR3.

Then, the third light emitting part LE3 may be bonded to a structure, in which the first light emitting part LE1 and the second light emitting part LE2 are bonded with each other, by using the third adhesion layer AD3. The third adhesion layer AD3 may include SOG and be bonded with the second insulation layer212through a thermo-compression process. The fourth coupling pattern312may be aligned with the third through pattern214, the fifth coupling pattern314may be aligned with the fourth through pattern216, and the sixth coupling pattern316may be aligned with the fifth through pattern218.

In this manner, a first through structure TVP1 which includes the first through pattern112, the first coupling pattern116, the third coupling pattern210, the third through pattern214, the fourth coupling pattern312, the sixth through pattern310, and the seventh through pattern320, a second through structure TVP2 which includes the second through pattern114, the second coupling pattern118, the fourth through pattern216, the fifth coupling pattern314, and the eighth through pattern322, and a third through structure TVP3 which includes the fifth through pattern218, the sixth coupling pattern316, and the ninth through pattern324may be respectively formed. The first through structure TVP1 may be formed in the first area AR1, the second through structure TVP2 may be formed in the second area AR2, and the third through structure TVP3 may be formed in the third area AR3.

Referring back toFIG.1B, a common electrode pad CEL which is brought into electrical contact with the first through structure TVP1 in the first area AR1, a first electrode pad EL1 which is brought into electrical contact with the second through structure TVP2 in the second area AR2, a second electrode pad EL2 which is brought into electrical contact with the third through structure TVP3 in the third area AR3, and a third electrode pad EL3 which is brought into electrical contact with the third n-type semiconductor layer302in the fourth area AR4 may be respectively formed.

According to the exemplary embodiments, a light emitting device may include through patterns that pass through a first light emitting part, a second light emitting part, and a third light emitting part, and coupling patterns disposed in a first adhesion layer and a second adhesion layer that electrically couple the first to third light emitting parts with a common electrode pad, a first electrode pad, a second electrode pad, and a third electrode pad. In this manner, a wider light emitting area may be obtained as compared to when each of the first to third light emitting parts is formed to include a mesa structure. Also, as compared to a case where the first to third light emitting parts are electrically coupled straight to the command electrode pad, the first electrode pad, the second electrode pad, and the third electrode pad without using the through patterns and the coupling patterns, the degree of difficulty in manufacturing process may be reduced.