A light-emitting device includes a light-emitting laminated structure, an electrode structure that is disposed on the light-emitting laminated structure, an insulation layer that is disposed on the light-emitting laminated structure, and a blocking layer structure that is interposed between the electrode structure and the insulation layer. The light-emitting laminated structure includes a first type semiconductor layer, a second type semiconductor layer, and an active layer that is interposed between the first type semiconductor layer and the second type semiconductor layer and is configured to emit light. The blocking layer structure has a first section and a second section that forms a continuous structure with the first section. The first section is interposed between a side wall of the electrode structure and the insulation layer, and the second section is interposed between the insulation layer and the light-emitting laminated structure.

CROSS-REFERENCE TO RELATED APPLICATION

This application claims priority of Chinese Patent Application No. 202210616589.2, filed on Jun. 1, 2022.

FIELD

The present disclosure relates to a semiconductor optoelectronic device, and more particularly to a light-emitting device.

BACKGROUND

Light-emitting diode is a type of semiconductor optoelectronic device that may emit light by releasing energy in the form of photons upon recombination of electrons with electron holes. The light-emitting diode is widely applied in several fields (e.g., illumination, optical communication, display, etc.) for its advantageous characteristics, e.g., low power consumption, pure chromaticity, long lifespan, fast response time, and eco-friendliness, etc.

In conventional light-emitting diodes, a silicon dioxide (SiO2) material is usually used to form an insulation layer. However, such an insulation layer lacks high compactness and exhibits low adhesion property with a metal material. Hence, the insulation layer is prone to intrusion of moisture and electrolytes so a metal electrode of the light-emitting diode may peel off after long-term use. As coverage of the insulation layer on the metal electrode deteriorates, metal atoms would lose protection and may easily migrate from a p-type electrode to an n-type electrode in an applied electric field.

FIG.1is a scanning electron microscope (SEM) diagram of the conventional light-emitting diode that shows a common metal migration occurring in the conventional light-emitting diode, in which the metal electrode of the light-emitting diode experiences migration of relatively high active metals such as chromium, nickel, aluminum, etc., or even gold that has a high specific gravity. If this migration occurs continuously, it would cause current leakage at an edge of a quantum well layer (i.e., an active layer) and short circuit of the light-emitting diode; the metal electrode may even peel off if the migration of Cr, Ni, Al and Au is exacerbated. Therefore, in the conventional light-emitting diode, in order to resolve the aforesaid problems, an adhesive layer (i.e., a thin titanium layer) is disposed between the insulation layer and the metal electrode to enhance the adhesion therebetween. However, the thin titanium layer is still unable to completely protect a side wall of the metal electrode from the intrusion of moisture. Thus, chromium, nickel, aluminum, and gold of the metal electrode would still migrate when the light-emitting diode is in use.

SUMMARY

Therefore, an object of the disclosure is to provide a light-emitting device that can alleviate at least one of the drawbacks of the prior art.

According to the disclosure, a light-emitting device includes a light-emitting laminated structure, an electrode structure, an insulation layer, and a blocking layer structure. The light-emitting laminated structure includes a first type semiconductor layer, a second type semiconductor layer, and an active layer that is interposed between the first type semiconductor layer and the second type semiconductor layer and is configured to emit light. The electrode structure is disposed on the light-emitting laminated structure. The insulation layer is disposed on the light-emitting laminated structure. The blocking layer structure is interposed between the electrode structure and the insulation layer. The blocking layer structure has a first section and a second section that forms a continuous structure with the first section. The first section is interposed between a side wall of the electrode structure and the insulation layer, and the second section is interposed between the insulation layer and the light-emitting laminated structure.

DETAILED DESCRIPTION

FIG.2is a sectional view illustrating a light-emitting device of a first embodiment according to the disclosure. Referring toFIG.2, the light-emitting device of the first embodiment includes a substrate110, a light-emitting laminated structure120, a current spreading layer130, an electrode structure140, a blocking layer structure150, and an insulation layer160.

The substrate110may be an insulating substrate, and may be made from a transparent material, a semi-transparent material, a non-transparent material, but is not limited thereto. In this embodiment, the substrate110is a sapphire substrate (i.e., an aluminum oxide (Al2O3) substrate). In certain embodiments, the substrate110is a patterned sapphire substrate. In some embodiments, the substrate110may be made from a conducting material or a semiconductor material. For instance, the substrate10is made from a material selected from the group consisting of silicon carbide (SiC), silicon (Si), magnesium aluminum oxide (MgAl2O4), magnesium oxide (MgO), lithium aluminum oxide (LiAlO2), gallium nitride (GaN), and combinations thereof. In some embodiments, the substrate10may be thinned or removed to obtain a thin-film light-emitting device1.

In some embodiments, a top surface of the substrate110is entirely formed with pattern structures (not shown in the Figure) that are used to enhance light extraction efficiency of the light-emitting device and a crystallinity of the light-emitting laminated structure120(to be described), but is not limited thereto. In certain embodiments, the pattern structures may be omitted or formed on some certain regions of the top surface of the substrate110. It should be noted that, the pattern structures may have a shape such as a frustum shape, a circular cone shape, a triangular pyramid shape, a hexagonal pyramid shape, a circular cone-like shape, a triangular pyramid-like shape, a hexagonal pyramid-like shape, etc., but are not limited thereto. The pattern structures and the substrate110may be made from the same material or different materials. In some embodiments, the pattern structures are made from a material (e.g., silicon dioxide (SiO2)) having a refractive index of less than that of the substrate110, so as to facilitate light extraction.

The light-emitting laminated structure120is formed on the substrate10(i.e., the top surface of the substrate10) by epitaxy such as metalorganic chemical vapor deposition (MOCVD), molecular beam epitaxy (MBE), hydride vapor phase epitaxy (HYPE), physical vapor deposition (PVD), ion plating, etc., but is not limited to thus. In this embodiments, the light-emitting laminated structure120includes a first type semiconductor layer121, an active layer122(also called light-emitting layer), and a second type semiconductor layer123that are stacked on one another in such order from the top surface of the substrate110. In some embodiments, the light-emitting laminated structure120and the substrate110are interconnected through a bonding layer that is made from a transparent material.

The first type semiconductor layer121is doped with a first conductivity type dopant, and the second type semiconductor layer123is doped with a second conductivity type dopant that is opposite in conductivity type to the first conductivity type dopant. For instance, the first type semiconductor layer121may be doped with an n-type dopant providing electrons, and the second type semiconductor layer123may be doped with a p-type dopant providing holes, and vice versa. In this embodiment, the first type semiconductor layer121is an n-type semiconductor layer, and the second type semiconductor layer123is a p-type semiconductor layer. The n-type semiconductor layer may be an n-type nitride semiconductor layer that is doped with group IV element, and the p-type semiconductor layer may be a p-type nitride semiconductor layer that is doped with group II element or other suitable dopants. For instance, the first type semiconductor layer121(i.e., the n-type semiconductor layer) is doped with silicon (Si), germanium (Ge), tin (Sn), and combinations thereof, and the second type semiconductor layer123(i.e., the p-type semiconductor layer) is doped with magnesium (Mg), zinc (Zn), beryllium (Be), and combinations thereof. It should be noted that, each of the first type semiconductor layer121and the second type semiconductor layer123may be formed as a single-layer structure, or a multi-layered structure having different compositions.

The active layer122may emit light that has a predetermined wavelength (e.g., blue light, green light, red light, violet light, ultra-violet light, etc.). In this embodiment, the active layer122is configured to emit blue light. It should be noted that, the active layer122may be formed to have a single quantum well structure or a multiple quantum well (MQW) structure. The multiple quantum well structure includes a plurality of well layers and a plurality of barrier layers that are stacked on one another alternately. The barrier layer may be a layer that is made from gallium nitride, aluminum gallium nitride (AlGaN), or other suitable materials. In some embodiments, the active layer122is formed as a multiple quantum well structure that may be a paired structure including gallium nitride/aluminum gallium nitride, indium aluminum gallium nitride (InAlGaN)/indium aluminum gallium nitride structure, or indium gallium nitride (InGaN)/aluminum gallium nitride. It should be noted that, by adjusting a depth of the quantum well, the number of paired stacks of the well layers and the barrier layers, a thickness of the paired stacks, or other characteristics of the quantum well structure, enhancement of light-emitting efficiency of the active layer122may be achieved.

However, the configuration of the light-emitting laminated structure120is not limited to the aforesaid materials or structures, in other embodiments, other suitable types of material or structure may be selected according to actual requirements.

In some embodiments, the light-emitting device further includes a buffer layer (not shown in the Figures) that is disposed between the substrate110and the light-emitting laminated structure120to reduce lattice mismatch between the substrate110and the first type semiconductor layer121. In some embodiments, the buffer layer is formed to have an undoped gallium nitride (u-GaN) layer or an undoped aluminum gallium nitride (u-AlGaN) layer.

The buffer layer may be formed as a single layer structure or a multi-layered structure, and is formed by epitaxy such as metalorganic chemical vapor deposition (MOCVD), molecular beam epitaxy (MBE), physical vapor deposition (PVD), etc., but is not limited to thus. The method of physical vapor deposition may include sputtering deposition (e.g., reactive sputtering, etc.) or evaporation deposition (e.g., beam vapor deposition, thermal evaporation, etc.). In this embodiment, the buffer layer includes an aluminum nitride (AlN) layer that is formed by sputtering deposition, and the aluminum nitride layer is formed on the pattern structure of the substrate10. The method of sputtering deposition may allow the buffer layer to have characteristics such as high uniformity and high compactness, so the buffer layer may be formed on the pattern structure of the substrate10.

The current spreading layer130is disposed on the light-emitting laminated structure120opposite to the substrate110, and is in contact with the second type semiconductor layer123of the light-emitting laminated structure120. The current spreading layer130is used to enhance current spreading and form an ohmic contact with the second type semiconductor layer123. Furthermore, the current spreading layer130may be made from a material selected from the indium tin oxide (ITO), indium (III) oxide (In2O3), tin dioxide (SnO2), cadmium tin oxide (CTO), antimony tin oxide (ATO), zinc oxide (ZnO), gallium phosphide (GaP), and combinations thereof, and is formed by the sputtering deposition or the evaporation deposition. In this embodiments, the current spreading layer130has a thickness ranging from 5 nm to 500 nm. In certain embodiments, the thickness of the current spreading layer130ranges from 50 nm to 300 nm.

The electrode structure140is disposed on the light-emitting laminated structure120, and includes a first electrode141and a second electrode142. The first electrode141is disposed on the first type semiconductor layer121of the light-emitting laminated structure120and is electrically connected to the first type semiconductor layer121. The second electrode142is disposed on the current spreading layer130and is in contact with the second type semiconductor layer123of the light-emitting laminated structure120by extending through the current spreading layer130so that the second electrode142is electrically connected to the second type semiconductor layer123. Each of the first electrode141and the second electrode142is made from a metal material having high reflectivity and high conductivity such as aluminum (Al), copper (Cu), silver (Ag), gold (Au), platinum (Pt), or combinations thereof.

FIGS.3and4are enlarged views of a region A and region B ofFIG.1respectively. Referring toFIGS.3and4, the electrode structure140(i.e., each of the first electrode141and the second electrode142) has a first metal layer141a,142a, a second metal layer141b,142b, and a third metal layer141d,142d. The first metal layer141a,142ais disposed on the light-emitting laminated structure120and is in contact with the first type semiconductor layer121or the second type semiconductor layer123of the light-emitting laminated structure120(i.e., the first metal layer141aof the first electrode141is in contact with the first type semiconductor layer121, and the first metal layer142aof the second electrode142is in contact with the second type semiconductor layer123). The second metal layer141b,142bis disposed between the first metal layer141a,142aand the third metal layers141d,142dand covers the first metal layer141a,142a. The third metal layer141d,142dcovers the first metal layer141a,142aand the second metal layer141b,142b, and is in contact with the blocking layer structure150(to be described). In some embodiments, the electrode structure140further has a forth metal layer141c,142cthat is disposed between the second metal layer141b,142band the third metal layers141d,142dand covers the first metal layer141a,142aand the second metal layer141b,142b.

Each of the first metal layers141a,142ais made from a material selected from the group consisting of chromium, titanium, nickel, and combinations thereof, so as to enhance adhesion between the first metal layers141a,142aand the light-emitting laminated structure120. Each of the second metal layers141b,142bis made from a material selected from the group consisting of aluminum, silver, platinum, and an aluminum-silver alloy, to serve as a reflection layer. Each of the third metal layers141d,142dis made from gold, platinum, or combinations thereof, which is used for wire bonding with external elements. In this embodiment, the third metal layer141d,142dis formed from gold. Each of the forth metal layers141c,142cis made from a material such as a titanium-platinum alloy, a nickel-platinum alloy, or other suitable materials, to protect aluminum that may easily be oxidized and to avoid migration of metals such as aluminum, chromium, etc.

Referring toFIGS.2to4, the blocking layer structure150is disposed on the electrode structure140, and is configured to cover a side wall of the electrode structure140, a portion of the light-emitting laminated structure120adjacent to the electrode structure140, and a portion of the current spreading layer130adjacent to the electrode structure140. Particularly, the blocking layer structure150includes a first blocking layer151that is in contact with the first electrode141, and a second blocking layer152that is in contact with the second electrode142. The insulation layer160is disposed on the light-emitting laminated structure120. Specifically, the insulation layer160covers a top surface and a side wall of the light-emitting laminated structure120, the current spreading layer130, the electrode structure140, and the blocking layer structure150. The blocking layer structure150is interposed between the electrode structure140and the insulation layer160.

Referring toFIG.4, the second blocking layer152is divided into a first section152aand a second section152bthat forms a continuous structure with the first section152a. The first section152acovers and is in contact with the side wall of the second electrode142of the electrode structure140. The second section152bcovers and is in contact with the current spreading layer130adjacent to the second electrode142; particularly, the second section152bis in surface contact with the current spreading layer130. The first section152aextends downward from the side wall of the second electrode142to the second section152bthat is located on a portion of a top surface of the current spreading layer130adjacent to the side wall, and is interposed between the side wall of the second electrode142and the insulation layer160. The second section152bis interposed between the insulation layer160and the second type semiconductor layer123of the light-emitting laminated structure120. Generally, due to limitations in the production of the light-emitting device, a portion of the insulation layer160that covers the side wall of the first or second electrode141,142may have a relatively thin thickness, so gold migration is likely to occur at the side wall of the second electrode142. Thus, by disposing the first section152aof the second blocking layer152, the aforesaid problem may be resolved. Furthermore, since the gold contained at a bottom portion of the second electrode142(i.e., a bottom portion of the third metal layer142d) is closer in distance to a location where electromigration occurs than that of the gold contained at the side wall of the second electrode142(i.e., buckets effect), by forming the second section152bthat forms the continuous structure with the first section152aon the portion of the current spreading layer130adjacent to the side wall of the second electrode142, occurrence of gold migration at the bottom portion of the second electrode142may be avoided. If gold migration occurs at the bottom portion of the second electrode142, the metal materials (e.g. aluminum, chromium and/or nickel) that are covered by gold may be damaged or corroded, reliability of the light-emitting device may be affected and failure of the light-emitting device may result. In the conventional light-emitting diode, only a thin adhesion layer is disposed on the side surface of the electrode, which is unable to block the metal migration occurring in the electrode, especially at the bottom of the electrode.

In this embodiment, referring to theFIG.4, the second section152bof the second blocking layer152further contacts with the third metal layer142dof the second electrode142and also forms the continuous structure with the first section152aof the second blocking layer152. By such configuration, external moisture may not permeate into the second electrode142, and gold migration occurring at the bottom portion of the second electrode142may be effectively avoided.

In this embodiment, referring toFIG.4, the second section152bof the second electrode152of the blocking layer structure150has a width (W2) of greater than 0.5 μm. In certain embodiments, the width (W2) of the second section152branges from 0.5 μm to 15 μm, e.g., 0.5 μm, 1 μm, 2 μm, 3 μm, 4 μm, μm, 6 μm, 7 μm, 8 μm, 9 μm, 10 μm, 11 μm, 12 μm, 13 μm, 14 μm, or 15 μm. If the width (W2) of the second section152bis less than 0.5 μm, the continuous structure formed by the first section152aand the second section152bof the second blocking layer152may not be able to avoid intrusion of moisture that may cause gold migration at the bottom of the second electrode142; and if the width (W2) of the second section152bis greater than 15 μm, the second section152bof the second blocking layer152that is located on the current spreading layer130may adversely affect the light extraction efficiency of the light-emitting device.

Since gold migration is more likely to occur at the bottom portion of the second electrode142compared to the side wall of the second electrode142, the width (W2) of the second section152bis not less than (i.e., greater than or equal to) 5 times of the thickness (H1) of the first section152a. In certain embodiments, the width (W2) of the second section152bis not less than 10, 15, or 50 times of the thickness (H1) of the first section152a.

In some embodiments, referring toFIG.4, the second blocking layer152further has a third section152cthat is connected to the first section152aand covers a portion (i.e., an edge portion) of a top surface of the second electrode142of the electrode structure140distal from the light-emitting laminated structure120. The third section152cforms continuously with the first section152aand the second section152b. By such configuration, protection of the gold layer of the second electrode142may be further enhanced to avoid gold migration. The third section152chas a width (W3) of not greater than 5 μm. In certain embodiments, the width (W3) ranges from 0.2 μm to 3 μm, e.g., 0.2 μm, 0.5 μm, 1 μm, 2 μm, or 3 μm. If the width (W3) of the third section152cis greater than 5 μm, an area of the top surface of the second electrode142that is exposed from the second blocking layer152would be too small, which may adversely affect subsequent wire bonding and the reliability of the light-emitting device. In addition, the third section152chas a thickness (H3) of not less than 30 Å. In certain embodiments, the thickness (H3) of the third section152cmay be the same or different from the thickness (H2) of the second section152b.

In this embodiment, the second blocking layer152is made from a material selected from the group consisting of chromium (Cr), titanium (Ti), platinum (Pt), palladium (Pd), osmium (Os), iridium (Ir), ruthenium (Ru), rhodium (Rh), and combinations thereof. The second blocking layer152not only may avoid gold migration occurring at the bottom of the second electrode142but also may enhance adhesion between the insulation layer160and the second electrode142, so as to prevent peeling of the insulation layer160from the electrode structure140, and failure of the light-emitting device due to the intrusion of moisture.

In this embodiment, the second blocking layer152is an aluminum oxide (Al2O3) layer that is formed by atomic layer deposition (ALD). The aluminum oxide second blocking layer152is more compact than the insulation layer160, and thus is capable of preventing corrosion of the electrode structure which would cause metal migration.

Referring back toFIG.3, in this embodiment, the first blocking layer151is generally similar to the second blocking layer152shown inFIG.4, except for the following differences. The first blocking layer151is divided into a first section151a, a second section151b, and a third section151c. The second section151bis in contact with the first type semiconductor layer121of the light-emitting laminated structure120, particularly, the second section151bis in surface contact with the first type semiconductor layer121. Furthermore, the first section151aextends downward from the side wall of the first electrode141to the second section151bthat is located on a portion of a top surface of the first type semiconductor layer121adjacent to the side wall of the first electrode141. The second section151bof the first electrode151of the blocking layer structure150has a width (W2) of greater than 0.5 μm. Since it is not necessary to consider the impact of the width (W2) on the light extraction efficiency of the light-emitting device, as long as the width (W2) is greater than 0.5 μm, the intrusion of moisture that may cause the corrosion of chromium, nickel, aluminum, and gold of the first electrode141of the electrode structure140may be avoided effectively.

The insulation layer160is formed with a plurality of openings that are located above the first electrode141and the second electrode142and are communicated with the top surface of the first electrode141and the top surface of the second electrode142. Thus, a portion of the top surface of the first electrode141and a portion of the top surface of the second electrode142are exposed from the insulation layer160for wire bonding. In this embodiment, the insulation layer160has a thickness ranging from 100 nm to 500 nm. In certain embodiments, the thickness of the insulation layer160ranges from 150 nm to 300 nm.

The insulation layer160is made from a material from the group consisting of silicon dioxide (SiO2), silicon nitride (SiN), aluminum oxide (Al2O3), and combinations thereof, but is not limited thereto. In this embodiment, the insulation layer160is a silicon dioxide layer that has superior physical characteristics and superior chemical stability, and therefore is capable of protecting the current spreading layer130, the light-emitting laminated structure120, and the electrode structure140. In some embodiments, the insulation layer160may be formed as a multi-layered structure (e.g., distributed Bragg reflector (DBR)) composed of multiple dielectric film layers with high refractive index and multiple dielectric film layers with low refractive index that are alternately stacked on one another. The dielectric film layers with high refractive index are made from a material selected from the group consisting of titanium dioxide (TiO2), niobium pentoxide (Nb2O5), tantalum pentoxide (Ta2O5), hafnium (IV) oxide (HfO2), zirconium dioxide (ZrO2), or any combination thereof, but is not limited thereof; and the dielectric film layers with low refractive index are made from a material selected from the group consisting of silicon dioxide (SiO2), magnesium fluoride (MgF2), aluminum oxide (Al2O5), silicon oxynitride (SiON), or any combination thereof, but is not limited thereof. By such configuration, the insulation layer160may have a superior photoelectronic property.

FIGS.5and6illustrate a light-emitting device of a second embodiment according to the disclosure.FIG.5is a sectional view illustrating the light-emitting device of the second embodiment, andFIG.6is an enlarged view of a region C ofFIG.5. Referring toFIGS.5and6, the light-emitting device of the second embodiment is generally similar to the aforementioned light-emitting device of the first embodiment except for the following differences.

Referring toFIGS.5and6, the light-emitting device of the second embodiment further includes an adhesive layer170that is disposed between the second blocking layer152(i.e., the aluminum oxide layer) and the second electrode142, to improve adhesion therebetween. In some embodiments, referring toFIGS.5and6, the adhesive layer170is further disposed between the first blocking layer151and the first electrode141. In particular, the adhesive layer170is disposed on the side wall and a portion of the top surface of the second electrode142, and is in contact with the first section152aand the third section152cof the second blocking layer152, such that the adhesion between the second electrode142and the second blocking layer152may be enhanced.

In some embodiments, the adhesive layer170may be further disposed between the current spreading layer130and the second section152bof the second blocking layer152, so as to further enhance the adhesion between the second electrode142and the second blocking layer152.

In this embodiment, the adhesive layer170is made from a material selected from the group consisting of chromium, titanium, platinum, and combinations thereof, but is not limited thereof.

In other embodiments, in the second blocking layer152, the second section152bmay be made from aluminum oxide (Al2O3) and is formed by atomic layer deposition (ALD), and the first section152amay be made from a metal material. By such configuration, not only the adhesion may be improved, corrosion of the metal material of the second electrode142caused by the intrusion of moisture may also be avoided. In such case, the adhesive layer170may be omitted.

FIGS.7to11illustrate a method for producing the light-emitting device of the first embodiment.

Referring toFIG.7, firstly, the light-emitting laminated structure120including the first type semiconductor layer121, the active layer122, and the second type semiconductor layer123is formed on the substrate110. Then, the light-emitting laminated structure120is etched from the second type semiconductor layer123side toward the first type semiconductor layer121side until the first type semiconductor layer121is exposed, so that the light-emitting laminated structure120is formed with a recess structure120a. Furthermore, a peripheral portion of the light-emitting laminated structure120may be optionally etched or removed, so as to expose a peripheral portion of the substrate110(not shown in the Figure), which may facilitate the subsequent dicing process.

Referring toFIG.8, the current spreading layer130is formed on the second type semiconductor layer123of the light-emitting laminated structure120. The current spreading layer130is used to enhance current spreading, so as to improve the reliability of the light-emitting device. Then, the opening130ais formed in the current spreading layer130, so as to expose a portion of the second type semiconductor layer123. InFIG.8, the current spreading layer130is not in contact with the first type semiconductor layer121of the light-emitting laminated structure120.

Referring toFIG.9, the first electrode141is formed on the first type semiconductor layer121, and the second electrode142is formed on the second type semiconductor123and the current spreading layer130. The second electrode142fills the opening130aof the current spreading layer130, so as to improve adhesion between the second electrode142and the current spreading layer130, thereby avoiding peeling of the second electrode142. InFIG.9(A), the first electrode141and the second electrode142are represented by parallel shading lines.

Referring toFIG.10, the first blocking layer151is formed on the side wall of the first electrode141, the portion of the top surface of the first electrode141and the portion of the first type semiconductor layer121adjacent to the first electrode141; and the second blocking layer152is formed on the side wall of the second electrode142, the portion of the top surface of the second electrode142adjacent to the side wall of the second electrode142, and the portion of the current spreading layer130adjacent to the bottom of the second electrode142. InFIG.10(A), the first blocking layer151and the second blocking layer152are represented by parallel shading lines.

Referring toFIG.11, the insulation layer160is formed to cover the light-emitting laminated structure120, the side wall and the portion of the top surface of the first electrode141, the side wall and the portion of the top surface of the second electrode142, the current spreading layer130, the first blocking layer151, and the second blocking layer152. InFIG.11(A), the insulation layer160is represented by parallel shading lines.

In sum, by having the blocking layer structure150between the electrode structure140and the insulation layer160, in which the first section151a,152aof the blocking layer structure150is interposed between the side wall of the electrode structure140and the insulation layer160, and the second section151b,152bis interposed between the insulation layer160and the light-emitting laminated structure120, the intrusion of moisture and electrolyte to the electrode structure140may be avoided. Therefore, migration of chromium, nickel, aluminum, silver, gold, from the electrode structure140may be prevented and problems such as current leakage and short circuit of the light-emitting device may be alleviated.