Semiconductor light emitting device package with wavelength conversion layer

A semiconductor light emitting device package is provided and includes a light emitting diode (LED) chip including a first electrode and a second electrode, the LED chip having a first surface on which the first electrode and the second electrode are disposed, and a second surface opposing the first surface; a dam structure disposed on the first surface, an outside edge of the dam structure being co-planar with an outside edge of the LED chip; and a wavelength conversion layer disposed on side surfaces of the LED chip, the second surface of the LED chip, and a surface of the dam structure, the wavelength conversion layer containing a wavelength conversion material.

CROSS-REFERENCE TO RELATED APPLICATION

This application claims priority from Korean Patent Application No. 10-2015-0159217, filed on Nov. 12, 2015 in the Korean Intellectual Property Office, the disclosure of which is incorporated by reference herein in its entirety.

BACKGROUND

Apparatuses, devices, and articles of manufacture consistent with the present disclosure relate to a semiconductor light emitting device package.

When a current is applied to a semiconductor light emitting device, the semiconductor light emitting device emits light using the principle of the recombination of electrons and holes, and semiconductor light emitting devices are widely used as light sources due to various advantages thereof, such as low power consumption, high brightness, and compact size. In particular, since nitride-based light emitting devices have been developed, the extent of the use of semiconductor light emitting devices has been expanding, and semiconductor light emitting devices have been employed in light source modules, home lighting fixtures, vehicle lighting, and the like.

With the increased use of semiconductor light emitting devices, the application of the semiconductor light emitting device has expanded to encompass high-current and high-output light source fields. As such, as semiconductor light emitting devices are used in high-current and high-output light source fields, improvements in luminous efficiency have been studied in the related art. In particular, a method of increasing an orientation angle of light emitted from a package in which a semiconductor light emitting device is provided is being investigated in fields related to light source modules.

SUMMARY

One or more example embodiments provide a semiconductor light emitting device package having improved color quality and an increased orientation angle of light.

According to an aspect of an example embodiment, there is provided a semiconductor light emitting device package including a light emitting diode (LED) chip having a first surface on which a first electrode and a second electrode are disposed, and a second surface opposing the first surface; a dam structure disposed on the first surface, an outside edge of the dam structure being co-planar with an outside edge of the LED chip; and a wavelength conversion layer disposed on side surfaces of the LED chip, the second surface, and at least one surface of the dam structure, the wavelength conversion layer containing a wavelength conversion material.

According to an aspect of another example embodiment, there is provided a semiconductor light emitting device package including an LED chip having a first surface on which a first electrode and a second electrode are disposed, a second surface opposing the first surface, and at least one side surface connecting the first surface to the second surface; and a wavelength conversion layer having an opening portion exposing at least a portion of each of the first electrode and the second electrode, the wavelength conversion layer disposed on the first surface, the second surface, and the at least one side surface of the LED chip, and the wavelength conversion layer containing a wavelength conversion material.

According to an aspect of another example embodiment, there is provided a semiconductor light emitting device package including a light emitting diode (LED) chip including a substrate, a light emitting structure disposed on the substrate, and a first electrode and a second electrode disposed on a surface of the light emitting structure opposite to the substrate, the first and second electrodes being electrically connected to the light emitting structure; and a wavelength conversion layer disposed to cover the substrate and at least one side surface of the LED chip.

DETAILED DESCRIPTION

Hereinafter, example embodiments will be described as follows with reference to the attached drawings.

The present inventive concept may, however, be exemplified in many different forms and should not be construed as being limited to the specific example embodiments set forth herein. Rather, these example embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the disclosure to those skilled in the art.

It will be apparent that though the terms “first”, “second”, “third”, etc. may be used herein to describe various members, components, regions, layers and/or sections, these members, components, regions, layers and/or sections should not be limited by these terms. These terms are only used to distinguish one member, component, region, layer or section from another region, layer or section. Thus, a “first” member, component, region, layer or section discussed below could be termed a “second” member, component, region, layer or section without departing from the teachings of the example embodiments.

Hereinafter, example embodiments will be described with reference to schematic views illustrating example embodiments. In the drawings, for example, due to manufacturing techniques and/or tolerances, modifications of the shape shown may be estimated. Thus, example embodiments should not be construed as being limited to the particular shapes of regions shown herein, for example, to include a change in shape results in manufacturing. The following example embodiments may also be constituted by one or a combination thereof.

The contents of the present inventive concept described below may have a variety of configurations and propose only a required configuration herein, but are not limited thereto.

FIG. 1is a schematic perspective view of a semiconductor light emitting device package according to an example embodiment.FIG. 2is a schematic cross-sectional view taken along line I-I′ of the semiconductor light emitting device package ofFIG. 1.FIG. 3is a schematic cross-sectional view of a light emitting diode (LED) chip of the semiconductor light emitting device package ofFIG. 2.

Referring toFIGS. 1 and 2, a semiconductor light emitting device package100according to an example embodiment may include an LED chip110including a first electrode113and a second electrode114, a lateral wavelength conversion layer120disposed on side surfaces of the LED chip110, and an upper wavelength conversion layer130covering an upper surface of the LED chip110.

Referring toFIG. 3, the LED chip110may have a first surface B on which the first and second electrodes113and114are disposed, and a second surface C opposing the first surface B.

The LED chip110may include a light transmitting substrate111, and a light emitting structure112disposed on the light transmitting substrate111. A surface of the light emitting structure112may form the first surface B, and the first and second electrodes113and114may be connected to the light emitting structure112.

The light transmitting substrate111may be a substrate for semiconductor growth including a material such as a sapphire, SiC, MgAl2O4, MgO, LiAlO2, LiGaO2, or GaN. In this case, the sapphire may be a crystal having Hexa-Rhombo R3c symmetry, may have a lattice constant of 13.001 Å in a c-axis orientation, and a lattice constant of 4.758 Å in an a-axis orientation and have a C-plane (0001), an A-plane (11-20), an R-plane (1-102), and the like. In this case, the C-plane (0001) of this sapphire substrate may allow a thin nitride film to be grown thereupon relatively easily, and may be stable even at high temperatures, and thus the C-plane is predominantly utilized as a substrate for nitride growth.

The light transmitting substrate111may have surfaces opposing each other, and at least one of the opposing surfaces may have an unevenness structure formed thereon. The unevenness structure may be provided by etching a portion of the light transmitting substrate111, and may also be provided by forming a heterogeneous substance layer different from the light transmitting substrate111.

The light emitting structure112may include a first conductive semiconductor layer112A, an active layer112B, and a second conductive semiconductor layer112C sequentially disposed on a surface of the light transmitting substrate111. The first and second conductive semiconductor layers112A and112C may be n- and p-type semiconductor layers, respectively, and may include a nitride semiconductor. However, the first and second conductive semiconductor layers112A and112C are not limited thereto. In some example embodiments, it may be understood that the first and second conductive semiconductor layers112A and112C refer to n- and p-type nitride semiconductor layers, respectively. The first and second conductive semiconductor layers112A and112C may have a composition of AlxInyGa1-x-yN (0≦x≦1, 0≦y≦1, and 0≦x+y<1) which corresponds to a material such as GaN, AlGaN, or InGaN.

The active layer112B may emit visible light having a wavelength from about 350 nm to about 680 nm, and may include an undoped nitride semiconductor layer having a single quantum well (SQW) structure or a multiple quantum well (MQW) structure. The active layer112B may be formed of, for example, an MQW structure in which quantum barrier layers and quantum well layers having respective compositions of AlxInyGa1-x-yN (0≦x<1, 0≦y<1, and 0≦x+y<1) are alternately stacked to have a predetermined band gap. Such a quantum well may allow electrons and holes to be recombined with each other to emit light. For example, an InGaN/GaN structure may be used as the MQW structure. The first and second conductive semiconductor layers112A and112C and the active layer112B may be formed using a crystal growth process such as metal organic chemical vapor deposition (MOCVD), molecular beam epitaxy (MBE), or hydride phase vapor epitaxy (HYPE).

The first electrode113and the second electrode114may be provided to contact the first conductive semiconductor layer112A and the second conductive semiconductor layer112C, respectively.

The first and second electrodes113and114may include a monolayer or a multilayer structure formed of the first and second conductive semiconductor layers112A and112C and a conductive material having ohmic characteristics. The first and second electrodes113and114may be formed by depositing, for example, at least one of materials such as gold (Au), silver (Ag), copper (Cu), zinc (Zn), aluminum (Al), indium (In), titanium (Ti), silicon (Si), germanium (Ge), tin (Sn), magnesium (Mg), tantalum (Ta), chromium (Cr), tungsten (W), ruthenium (Ru), rhodium (Rh), iridium (Jr), nickel (Ni), palladium (Pd), platinum (Pt), and a transparent conductive oxide (TCO) using sputtering or the like. The first and second electrodes113and114may be disposed in an identical direction on the first surface B provided on an opposite side of the light transmitting substrate111, based on the light emitting structure112. The LED chip110may be disposed on a surface in a flip-chip form. In this case, light emitted from the active layer112B may be externally emitted via the light transmitting substrate111.

The first surface B of the LED chip110may include a first region R1and a second region R2surrounding the first region R1. The first region R1may have the first electrode113and the second electrode114disposed thereon. The second region R2may be disposed adjacently to an edge of the first surface B of the LED chip110.

A dam structure140may include a first dam structure141disposed adjacently to the second region R2of the LED chip110, and a second dam structure142disposed on a third region R3between the first and second electrodes113and114. The first dam structure141may be provided on each side of the LED chip110, as shown inFIG. 3. The first and second dam structures141and142may extend to be integrated with each other, but may also be separated from each other. The dam structure140may be formed to have a greater height than that of a coated lateral wavelength conversion layer in a subsequent process of manufacturing a semiconductor light emitting device package, thereby preventing the lateral wavelength conversion layer from permeating an upper surface of an LED chip in a process of coating the lateral wavelength conversion layer. The dam structure140may include a mixture of materials having high reflectivity, such as SiO2, SiN, SiOxNy, TiO2, Si3N4, Al2O3, TiN, AlN, ZrO2, TiAlN, and TiSiN, and may reflect light emitted from the active layer112B.

Referring toFIG. 2, the semiconductor light emitting device package100may include the lateral wavelength conversion layer120disposed on the side surfaces of the LED chip110, and the upper wavelength conversion layer130covering the upper surface of the LED chip110.

The lateral wavelength conversion layer120may be disposed to cover the side surfaces of the LED chip110. The lateral wavelength conversion layer120may be disposed to surround all of the side surfaces of the LED chip110to allow light emitted from the side surfaces of the LED chip110to be wavelength converted. Hence, the semiconductor light emitting device package100may provide a wider orientation angle of light as compared to a related art semiconductor light emitting device package, in which a reflective layer is formed on side surfaces of an LED chip and a wavelength conversion layer is disposed only on an upper surface of the LED chip. For example, the semiconductor light emitting device package100according to an example embodiment may provide light having an orientation angle greater than or equal to about 140°. The lateral wavelength conversion layer120may be disposed on the side surfaces of the LED chip110, and emission of light not passing through the lateral wavelength conversion layer120may thus be fundamentally prevented. Hence, a color of angle (COA) of emitted light may be increased.

The lateral wavelength conversion layer120may be disposed on the side surfaces of the LED chip110to have a substantially uniform thickness. Here, the substantially uniform thickness may mean that a change in the thickness of the lateral wavelength conversion layer120is within an acceptable error range in a process of manufacturing the semiconductor light emitting device package100even in a case in which the lateral wavelength conversion layer120does not have a constant thickness along the side surfaces of the LED chip110.

When the lateral wavelength conversion layer120may be disposed to surround all of the side surfaces of the LED chip110, the lateral wavelength conversion layer120surrounding the respective side surfaces of the LED chip110may have the substantially uniform thickness. The lateral wavelength conversion layer120is not limited thereto, and in some example embodiments only portions of the lateral wavelength conversion layer120disposed on opposing side surfaces of the LED chip110may have a substantially uniform thickness.

An upper surface123of the lateral wavelength conversion layer120may be disposed to contact an edge of the upper wavelength conversion layer130. In this case, side surfaces122of the lateral wavelength conversion layer120and side surfaces131of the upper wavelength conversion layer130may be disposed to form co-planar surfaces, respectively. A lower surface121of the lateral wavelength conversion layer120may also have a curved surface having a meniscus shape.

The lateral wavelength conversion layer120may include a mixture of a light transmitting material and a wavelength conversion material. In some example embodiments, such a light transmitting material may include a thermosetting resin. For example, the lateral wavelength conversion layer120may be a composite material in which a polymer binder including a thermosetting resin, a hardener, a curing catalyst, and the like is semi-cured (B-stage). Such a thermosetting resin may remain semi-cured when heated at a temperature lower than a threshold temperature to undergo a phase change to a level at which the thermosetting resin is malleable, but may be cured when heated at a temperature greater than a temperature. Hence, the wavelength conversion material may be coated on the side surfaces of the LED chip110while being semi-cured to be dispersed, and may then be cured through a heating process, thus covering the side surfaces of the LED chip110.

A resin used in the lateral wavelength conversion layer120may be an epoxy resin or a silicone resin that may satisfy properties such as high levels of adhesion, high light transmittance, high heat resistance, a high refractive index, and good moisture resistance. In order to secure a high level of adhesion, an additive contributing to an improvement in adhesion, for example, a silane-based material, may be employed.

The wavelength conversion material may be a phosphor or a quantum dot. The phosphor may be a garnet-based phosphor, such as YAG, TAG, or LuAG, a silicate-based phosphor, a nitride-based phosphor, a sulfide-based phosphor, or an oxide-based phosphor, and may be configured as a single type of phosphor or multiple kinds of phosphors mixed at a predetermined ratio.

The lateral wavelength conversion layer120may have a structure in which a single layer is stacked, or may be formed as a multilayer structure. When the lateral wavelength conversion layer120is formed as a multilayer structure, each of the multiple layers may contain different types of light transmitting materials and wavelength conversion materials. In this case, the light transmitting materials forming the respective layers may have different characteristics, respectively.

For example, a light transmitting material forming a lower layer may have a characteristic in which a strength of the light transmitting material is greater than that of a light transmitting material forming an upper layer, and the lateral wavelength conversion layer120may thus maintain a stable shape. A light transmitting material forming a layer that contacts the upper wavelength conversion layer130may also have a characteristic in which the light transmitting material has higher adhesion than that of the light transmitting material forming the lower layer to thus be easily bonded to the upper wavelength conversion layer130. One of the plurality of layers may include a transparent layer not containing a wavelength conversion material.

As illustrated inFIG. 2, the upper wavelength conversion layer130may be disposed to cover the entire second surface C of the LED chip110. The upper wavelength conversion layer130may be formed by dispersing the wavelength conversion material in a material similar to the light transmitting material used in the lateral wavelength conversion layer120described above. The light transmitting material may contain the thermosetting resin described above. Hence, the light transmitting material may remain semi-cured when heated at a temperature less than a predetermined threshold temperature to undergo a phase change to a level at which the thermosetting resin is malleable, but may be cured when heated at a temperature greater than or equal to a predetermined temperature. The upper wavelength conversion layer130may be provided in the form of a sheet being semi-cured and having adhesiveness. The LED chip110may be attached to the upper wavelength conversion layer130, and then may be cured through a heating process so that the upper wavelength conversion layer130may firmly adhere to an upper surface of the LED chip110.

The wavelength conversion material may be the phosphor or the quantum dot described above. The wavelength conversion material contained in the upper wavelength conversion layer130may be the same as that included in the lateral wavelength conversion layer120. The wavelength conversion material contained in the upper wavelength conversion layer130is not limited thereto, and may be a heterogeneous phosphor or quantum dot.

The upper wavelength conversion layer130may cover the entire second surface C of the LED chip110, and may have a width W2which covers the upper surface123of the lateral wavelength conversion layer120.

A thickness W2of the upper wavelength conversion layer130may be from about 15% to about 30% of a thickness W1of the lateral wavelength conversion layer120. When the upper wavelength conversion layer130and the lateral wavelength conversion layer120having such a thickness ratio are disposed, color variation of light emitted by the semiconductor light emitting device package100may be maintained to be less than or equal to ΔU′ V′0.01.

FIG. 4is a schematic cross-sectional view of a semiconductor light emitting device package200according to an example embodiment. In the example embodiment, an LED chip210having a structure identical to that of the LED chip110described above may be used, and a detailed description of the LED chip210will be omitted.

The semiconductor light emitting device package200according to an example embodiment may include the LED chip210including a first electrode213and a second electrode214, a wavelength conversion layer230covering side surfaces and an upper surface of the LED chip210.

The wavelength conversion layer230of the example embodiment may differ from the lateral wavelength conversion layer120and the upper wavelength conversion layer130described above in that the wavelength conversion layer230may be formed as a single body. The wavelength conversion layer230may also differ in that a lower surface231of the wavelength conversion layer230and a lower surface241aof a first dam structure241form a co-planar surface.

In the example embodiment, the side surfaces and the upper surface of the LED chip210may be covered with a single wavelength conversion layer230, and the semiconductor light emitting device package200may thus be manufactured more easily than in the example embodiment described above with respect toFIGS. 1-3.

A thickness W4of the wavelength conversion layer230may be from about 15% to about 30% of a thickness W3thereof. When the wavelength conversion layer230having such a thickness ratio is disposed, color variation of light emitted by the semiconductor light emitting device package200may be maintained to be less than or equal to ΔU′ V′ 0.01.

FIG. 5is a schematic cross-sectional view of a semiconductor light emitting device package300according to an example embodiment.FIG. 6is a schematic cross-sectional view of an LED chip of the semiconductor light emitting device package ofFIG. 5. The example embodiment may differ in that an LED chip310having a configuration different from that of the LED chips110and210described above is adopted.

Referring toFIG. 6, the LED chip310of the example embodiment may differ in that a light transmitting structure312is completely removed from a fourth region R4of a substrate311, and in that a reflective layer315is disposed on a region including side surfaces of the light transmitting structure312. Unlike the example embodiments described above, the LED chip310may also differ in that a dam structure is removed.

Turning toFIG. 5, the semiconductor light emitting device package300according to an example embodiment may include the LED chip310including a first electrode313and a second electrode314, and a wavelength conversion layer330covering side surfaces and an upper surface of the LED chip310, and having opening portions331and332that expose the first and second electrodes313and314, respectively. The light emitting structure312may include a first conductive semiconductor layer312A, an active layer312B, and a second conductive semiconductor layer312C.

The example embodiment may reduce a time used to manufacture a semiconductor light emitting device package by removing a dam structure, as compared to the example embodiments described above. Further, the reflective layer315may be disposed on the region including the side surfaces of the light transmitting structure312to reflect light emitted by the light transmitting structure312above the light transmitting structure312. A thickness W6of the wavelength conversion layer330may be from about 15% to about 30% of a thickness W5thereof. When the wavelength conversion layer330having such a thickness ratio is disposed, color variation of light emitted by the semiconductor light emitting device package300may be maintained to be less than or equal to ΔU′V′0.01.

FIG. 7is a plan view of an LED chip1100employed in a semiconductor light emitting device package according to an example embodiment.FIGS. 8A and 8Bare cross-sectional views of LED chips according to various example embodiments, respectively.

Referring toFIGS. 7 and 8A, the LED chip1100according to an example embodiment may include a dam structure1180. The dam structure1180may be disposed to expose a first electrode1130and a second electrode1140. As illustrated inFIG. 8A, a light transmitting structure1120may be formed on a substrate1110as in the LED chip110illustrated inFIG. 3. The light emitting structure1120may include a first conductive semiconductor layer1121, an active layer1122, and a second conductive semiconductor layer1123sequentially stacked on the substrate1110.

As described above with reference toFIG. 3, the LED chip1100may be disposed on a circuit board in a flip-chip form. Hence, the LED chip1100may include the first electrode1130and the second electrode1140as illustrated inFIGS. 7 and 8A. The first electrode1130and the second electrode1140may be formed on respective open regions from which portions of a cover layer1170are removed. Meanwhile, the numbers of the first electrode1130and the second electrode1140and an arrangement thereof are not limited to the drawings, and may be changed. In an example embodiment, the first electrode1130and the second electrode1140may be, for example, an under bump metallurgy (UBM) layer.

The first electrode1130and the second electrode1140may be provided on a first metal layer1151and a second metal layer1152, respectively. The first metal layer1151may be electrically connected to a first contact electrode1135provided on the first conductive semiconductor layer1121through a first opening portion1161′, and the second metal layer1152may be electrically connected to a second contact electrode1145provided on the second conductive semiconductor layer1123through a second opening portion1162′ (seeFIG. 8A).

Referring toFIGS. 8A and 8B, the LED chip1100illustrated inFIG. 7will hereinafter be described in more detail.

FIG. 8Ais a schematic cross-sectional view taken along line II-II′ of the semiconductor light emitting device package1100ofFIG. 7as a cross-sectional view of the semiconductor light emitting device (LED chip1100) illustrated inFIG. 7.FIG. 8Bis a modification ofFIG. 8A.

Referring first toFIG. 8A, the LED chip1100according to an example embodiment may include the substrate1110, the light transmitting structure1120disposed on the substrate1110, the first electrode1130, the second electrode1140and the like. The light emitting structure1120may include the first conductive semiconductor layer1121, the active layer1122, and the second conductive semiconductor layer1123sequentially stacked on the substrate1110.

The substrate1110may be, for example, a sapphire substrate, and may be provided as a substrate for semiconductor growth. When the substrate1110is the sapphire substrate, the substrate1110may be a crystal having Hexa-Rhombo R3c symmetry, may have a lattice constant of 13.001 Å in a c-axis orientation, and a lattice constant of 4.758 Å in an a-axis orientation, and may have a C-plane (0001), an A-plane (11-20), an R-plane (1-102), and the like. In this case, the C-plane (0001) of this sapphire substrate may allow a thin nitride film to be grown thereupon relatively easily, and may be stable even at high temperatures, and thus the C-plane may be predominantly utilized as a substrate for nitride growth. A plurality of unevenness structures may be provided on an upper surface of the substrate1110, for example, a surface on which the light transmitting structure1120is formed.

A buffer layer may further be formed on the upper surface of the substrate1110. The buffer layer may allow crystal defects of a semiconductor layer grown on the substrate1110to be reduced, and may include an undoped semiconductor layer formed of a nitride or the like. The buffer layer may reduce a difference between a lattice constant of the substrate1110including sapphire and that of the first conductive semiconductor layer1121stacked on the upper surface of the substrate1110and including a GaN layer, thereby increasing crystallinity of the GaN layer. Undoped GaN, AlN, and InGaN layers, and the like, may be applied to the buffer layer, and the buffer layer may be grown to have tens to hundreds Å of thicknesses at a low temperature of 500° C. to 600° C. Here, the term “undope” may mean that the semiconductor layer does not undergo an additional impurity doping process. For example, when a gallium nitride semiconductor including an impurity which is inherently present in the semiconductor layer and has a level of concentration is grown using metal organic chemical vapor deposition (MOCVD), Si or the like used as a dopant may be unintentionally contained in the semiconductor layer at a level of about 1104to about 1108/cm3. Such a buffer layer may be a necessary element in the example embodiment, and may be omitted according to some example embodiments.

As described above, the light emitting structure1120may include the first conductive semiconductor layer1121, the active layer1122, and the second conductive semiconductor layer1123. The first conductive semiconductor layer1121may include a semiconductor doped with an n-type impurity, and may be an n-type nitride semiconductor layer. The second conductive semiconductor layer1123may include a semiconductor doped with a p-type impurity, and may be a p-type nitride semiconductor layer. According to an example embodiment, the order in which the first conductive semiconductor layer1121and the second conductive semiconductor layer1123are stacked may also be reversed. The first and second conductive semiconductor layers1121and1123may have a composition of AlxInyGa1-x-yN (0≦x≦1, 0≦y≦1, and 0≦x+y≦1) which corresponds to a material such as GaN, AlGaN, InGaN, or AlInGaN.

The active layer1122may be disposed between the first and second conductive semiconductor layers1121and1123to emit light having a level of energy by a recombination of electrons and holes. The level of energy may be predetermined. The active layer1122may contain a material having an energy band gap less than that of the first and second conductive semiconductor layers1121and1123. For example, when the first and second conductive semiconductor layers1121and1123are a GaN-based compound semiconductor, the active layer1122may include an InGaN-based compound semiconductor having an energy band gap less than that of GaN. The active layer1122may have an MQW structure in which quantum well layers and quantum barrier layers are alternately stacked on each other, for example, an InGaN/GaN structure. The active layer1122is not limited thereto, and may also have an SQW structure.

In a manufacturing process, the light transmitting structure1120may be formed on the substrate1110, and then at least a region of the light transmitting structure1120may be removed, thereby forming a mesa region and an etching region.

The first contact electrode1135and the second contact electrode1145may be disposed on the first conductive semiconductor layer1121and the second conductive semiconductor layer1123, respectively. The first contact electrode1135may be disposed on the first conductive semiconductor layer1121on the etching region, and the second contact electrode1145may be disposed on the second conductive semiconductor layer1123on the mesa region. The first contact electrode1135may have pad portions and a finger portion having narrower widths than those of the pad portions so that electrodes may be uniformly injected therein as illustrated inFIG. 7. The pad portions may be disposed to be spaced apart from each other, and the finger portion may connect the pad portions to each other.

The second contact electrode1145may include a reflective metal layer1143and a coating metal layer1144covering the reflective metal layer1143. The coating metal layer1144may be selectively provided, and may also be removed according to an example embodiment. The second contact electrode1145may have a shape that covers an upper surface of the second conductive semiconductor layer1123. For example, the second contact electrode1145may have a greater surface area than that of the first contact electrode1135considering characteristics of the second conductive semiconductor layer1123having a relatively great electrical resistance, and may include a plurality of layers as illustrated inFIG. 8A. The first contact electrode1135and the second contact electrode1145may be formed on regions provided by selectively removing portions of a first insulating layer1161formed on the light transmitting structure1120.

A second insulating layer1162may be provided on the first contact electrode1135and the second contact electrode1145. The second insulating layer1162may expose at least a portion of each of the first contact electrode1135and the second contact electrode1145. As described above, at least a portion of the first and second insulating layers1161and1162collectively represented by an insulating layer1160may be removed, and the first opening portion1161′ and the second opening portion1162′ may thus be provided on the first contact electrode1135and the second contact electrode1145, respectively. The insulating layer1160may contain a silicon oxide or a silicon nitride such as SiO2, SiN, SiOxNy, TiO2, Si3N4, Al2O3, TiN, AlN, ZrO2, TiAlN, or TiSiN.

A metal layer1150may be provided on the insulating layer1160. The metal layer1150may include the first metal layer1151and the second metal layer1152. The first contact electrode1135may be connected to the first metal layer1151through the first opening portion1161′, and the second contact electrode1145may be connected to the second metal layer1152through the second opening portion1162′. The metal layer1150may include, for example, a material such as Au, W, Pt, Si, Jr, Ag, Cu, Ni, Ti, or Cr, and a material including at least one of alloys thereof.

As an insulating material, the cover layer1170may further be provided on the metal layer1150, and may cover side surfaces of the light transmitting structure1120and the metal layer1150. Regions of the cover layer1170may be selectively removed, and the first electrode1130and the second electrode1140may be provided on the regions that are removed from the cover layer1170. In other words, as illustrated inFIG. 8A, the first electrode1130may be disposed on the first metal layer1151, and the second electrode1140may be disposed on the second metal layer1152. Resultantly, the first electrode1130may be electrically connected to the first conductive semiconductor layer1121through the first metal layer1151and the first contact electrode1135, and the second electrode1140may be electrically connected to the second conductive semiconductor layer1123through the second metal layer1152and the second contact electrode1145.

As described above, the LED chip1100according to an example embodiment may have the dam structure1180provided adjacently to an edge of the LED chip1100. The dam structure1180may include a first dam structure1181disposed adjacently to a second region R2of the LED chip1100, and a second dam structure1182disposed on a third region R3between the first and second electrodes1130and1140. The first and second dam structures1181and1182may extend to be integrated with each other, but may also be separated from each other. The dam structure1180may be formed by disposing a mask on the first and second electrodes1130and1140of the LED chip1100, injecting a resin including a filler such as TiO2into the mask, and then hardening the mask. In this case, the dam structure1180may be formed to have a greater height than that of a coated lateral wavelength conversion layer in a subsequent process of manufacturing a semiconductor light emitting device package, thereby preventing the lateral wavelength conversion layer from permeating an upper surface of an LED chip in the process of coating the lateral wavelength conversion layer.

FIG. 8Billustrates an LED chip1200according to an example embodiment. The LED chip1200may differ from the LED chip1100of the example embodiment described above in that a substrate1210may be exposed by completely removing an edge of a light transmitting structure1220. The LED chip1200may also differ in that side surfaces of the light transmitting structure1220may be covered with a first insulating layer1261. The insulating layer1261may contain a silicon oxide or a silicon nitride such as SiO2, SiN, SiOxNy, TiO2, Si3N4, Al2O3, TiN, AlN, ZrO2, TiAlN, or TiSiN. Hence, light emitted to the side surfaces of the light transmitting structure1220may be fundamentally blocked, and the emitted light may be emitted only through the substrate1210. Resultantly, when the LED chip1200is applied to the semiconductor light emitting device package300ofFIG. 5, light may be prevented from being emitted to the side surfaces of the light transmitting structure1220without using a dam structure.

FIGS. 9A through 9Fare diagrams illustrating a method of manufacturing the LED chip1110ofFIG. 8A.

Referring first toFIG. 9A, the light transmitting structure1120may be formed on the substrate1110. The light emitting structure1120may include the first conductive semiconductor layer1121, the active layer1122, and the second conductive semiconductor layer1123sequentially stacked on the substrate1110. As illustrated inFIG. 9A, the substrate1110may include an unevenness structure provided on a surface on which the first conductive semiconductor layer1121is formed, and may contain a material such as sapphire, Si, SiC, MgAl2O4, MgO, LiAlO2, LiGaO2, or GaN.

The light transmitting structure1120may be formed by sequentially growing the first conductive semiconductor layer1121, the active layer1122, and the second conductive semiconductor layer1123on the substrate1110using a process such as metal organic chemical vapor deposition (MOCVD), hydride vapor phase epitaxy (HYPE), or a molecular beam epitaxy (MBE). The first conductive semiconductor layer1121and the second conductive semiconductor layer1123may be an n-type semiconductor layer and a p-type semiconductor layer, respectively. Locations of the first conductive semiconductor layer1121and the second conductive semiconductor layer1123may be changed with each other in the light transmitting structure1120, and the second conductive semiconductor layer1123may be formed first on the substrate1110.

Referring toFIG. 9B, a portion of the light transmitting structure1120may be etched to expose at least a portion of the first conductive semiconductor layer1121. The first insulating layer1161may be formed on a region on which the portion of the first conductive semiconductor layer1121is exposed. A portion of the first insulating layer1161may be removed, and portions of the first conductive semiconductor layer1121and the second conductive semiconductor layer1123may thus be exposed.

Referring next toFIG. 9C, the first contact electrode1135may be formed in the first opening portion1161′, and the second contact electrode1145may be formed. The second contact electrode1145may include the reflective metal layer1143and the coating metal layer1144. The first contact electrode1135may have the plurality of pad portions and the finger portions extending from the plurality of pad portions as illustrated inFIG. 7.

Referring toFIG. 9D, the second insulating layer1162may have a structure in which the light transmitting structure1120is entirely covered by the second insulating layer1162. Portions of the second insulating layer1162may be selectively removed on the first contact electrode1135and the second contact electrode1145, and the first metal layer1151and the second metal layer1152may be formed on the second insulating layer1162. The first metal layer1151may be electrically connected to the first contact electrode1135through the first opening portion1161′ in the first insulating layer1161, and the second metal layer1152may be electrically connected to the second contact electrode1145through the second opening portion1162′ in the second insulating layer1162.

Referring toFIG. 9E, the cover layer1170may be formed on the first and second metal layers1151and1152, and the first and second electrodes1130and1140may be provided on removed regions of the cover layer1170. The first and second electrodes1130and1140may be electrically connected to the first and second metal layers1151and1152, respectively. The cover layer1170may contain a material having electrically insulating characteristics such as SiO2, SiN, SiOxNy, TiO2, Si3N4, Al2O3, TiN, AlN, ZrO2, TiAlN, or TiSiN.

Referring toFIG. 9F, the dam structure1180may be formed to be provided adjacently to the edge of the LED chip1100. The dam structure1180may be formed by disposing the mask on the first and second electrodes1130and1140of the LED chip1100, injecting the resin including the filler such as TiO2into the mask, and then hardening the mask. When the LED chip is cut into individual LED chip units D, the LED chip1100ofFIG. 8Amay be manufactured.

A process of manufacturing the semiconductor light emitting device package200will next be described.FIGS. 10A through 10Dare views illustrating the process of manufacturing the semiconductor light emitting device package100ofFIG. 1.

As first illustrated inFIG. 10A, a wavelength conversion layer sheet130amay be prepared. The wavelength conversion layer sheet130amay be provided in a flexible semi-cured state by mixing a light transmitting material with a wavelength conversion material such as a phosphor or a quantum dot. Such a light transmitting material may be formed using an epoxy resin or a silicone resin.

The wavelength conversion layer sheet130amay be provided in a semi-cured state while having adhesiveness by being heated at a temperature lower than a curing temperature after mixing the light transmitting material with light reflecting particles, and may be used to attach and align the LED chip110in a subsequent process.

As next illustrated inFIG. 10B, a plurality of prepared LED chips110may be arranged on a surface of the wavelength conversion layer sheet130a. Each of the LED chips110may be disposed to allow the first surface B on which the first and second electrodes113and114are disposed to be exposed, and each of the LED chips110may be disposed such that the second surface C thereof is attached to the wavelength conversion layer sheet130a. The chip separation regions150between the plurality of LED chips110may be determined considering spaces on which the lateral wavelength conversion layers120will be formed in a subsequent process and regions which will disappear in the process of cutting into the individual semiconductor light emitting device packages100.

After the LED chips110are attached to the wavelength conversion layer sheet130a, the wavelength conversion layer sheet130amay be heated at a temperature greater than or equal to a curing temperature, becoming hardened. In an example embodiment, the wavelength conversion layer sheet130amay remain heated for about 30 minutes at a temperature of about 150° C., becoming hardened.

As next illustrated inFIG. 10C, wavelength conversion layers120amay be formed by coating spaces between the plurality of LED chips110with a wavelength conversion material. As described above, the wavelength conversion material may be coated in the spaces while being dispersed in a liquid light transmitting material. In more detail, the wavelength conversion material may be dispensed using a nozzle N. When the wavelength conversion layers120aare formed by dispersing the wavelength conversion material in the liquid light transmitting material and then dispensing the wavelength conversion material, meniscuses121amay be formed on surfaces of the wavelength conversion layers120aby surface tension.

After the wavelength conversion material is coated, the wavelength conversion material may be heated at a temperature greater than or equal to a curing temperature of the light transmitting material to be cured, and thus the wavelength conversion layers120amay be formed. In an example embodiment, the wavelength conversion material may remain heated for about 30 minutes at a temperature of about 150° C., forming the wavelength conversion layers120a.

As next illustrated inFIG. 10D, use of a blade E may allow the wavelength conversion layer sheet130aand the wavelength conversion layers120ato be cut into the individual semiconductor light emitting device packages100. In this case, the wavelength conversion layers120amay be cut in half so that the lateral wavelength conversion layers120having identical thicknesses may be disposed on the side surfaces, respectively, of each of the semiconductor light emitting device packages100. A method of separating the individual semiconductor light emitting device packages100is not limited thereto, and a method of separating the individual semiconductor light emitting device packages100using a laser beam, water jet, or the like may also be applied.

A process of manufacturing the semiconductor light emitting device package200will next be described.FIGS. 11A through 11Eare views illustrating the process of manufacturing the semiconductor light emitting device package200ofFIG. 4.

As first illustrated inFIG. 11A, an adhesive sheet T may be prepared. The adhesive sheet T may have a base film with a surface on which an adhesive layer is formed, and may be used to bond an LED chip in a subsequent process.

As next illustrated inFIG. 11B, a plurality of prepared LED chips210may be arranged on the adhesive layer of the adhesive sheet T. The LED chips210may be disposed to allow the first surface B on which the first and second electrodes213and214are disposed to be bonded to the adhesive sheet T.

As next illustrated inFIG. 11C, a wavelength conversion layer230amay be formed by coating a wavelength conversion material onto the plurality of LED chips210. The wavelength conversion material may be coated onto a light transmitting material being in a paste state while being dispersed therein. In particular, the wavelength conversion material may be coated using a method of screen printing a paste using a squeezer S.

As next illustrated inFIG. 11D, the wavelength conversion layer230amay be heated at a curing temperature or higher to be cured.

As next illustrated inFIG. 11E, the wavelength conversion layer230amay be cut into individual semiconductor light emitting device packages200by using a blade E, and then the adhesive sheet T may be removed.

As set forth above, according to example embodiments, disposal of a wavelength conversion layer on side surfaces and an upper surface of an LED chip may allow a semiconductor light emitting device package having improved color quality and an increased orientation angle of light to be provided.