Method of manufacturing semiconductor light emitting device package including light transmissive substrate having wavelength conversion regions

A method of manufacturing a semiconductor light emitting device package includes arranging a plurality of light emitting structures on a support substrate, each light emitting structure including a first conductivity-type semiconductor layer, an active layer and a second conductivity-type semiconductor layer, bonding a light transmissive substrate to the plurality of light emitting structures, the light transmissive substrate having a plurality of wavelength conversion regions corresponding to the plurality of light emitting structures, respectively, removing the support substrate from the plurality of light emitting structures, and separating individual semiconductor light emitting device packages from one another by removing at least a portion of the light transmissive substrate.

CROSS-REFERENCE TO RELATED APPLICATION

This application claims the priority of Korean Patent Application No. 10-2014-0072864 filed on Jun. 16, 2014, with the Korean Intellectual Property Office, the disclosure of which is incorporated herein by reference in its entirety.

TECHNICAL FIELD

The present disclosure relates to a method of manufacturing a semiconductor light emitting device package.

DISCUSSION OF RELATED ART

A light emitting diode (LED) is a device including a material that emits light through the application of electrical energy thereto, in which energy generated by electron-hole recombination in semiconductor junction parts is converted into light to be emitted therefrom. LEDs can be employed as light sources in general lighting devices, display devices, and the like.

SUMMARY

According to an exemplary embodiment in the present disclosure, a method of manufacturing a semiconductor light emitting device package may include arranging a plurality of light emitting structures on a support substrate, each light emitting structure including a first conductivity-type semiconductor layer, an active layer and a second conductivity-type semiconductor layer; bonding a light transmissive substrate to the plurality of light emitting structures, the light transmissive substrate having a plurality of wavelength conversion regions corresponding to the plurality of light emitting structures, respectively, removing the support substrate, and removing at least a portion of the light transmissive substrate and separating individual semiconductor light emitting device packages from one another.

The plurality of wavelength conversion regions may be formed by forming recesses in a surface of the light transmissive substrate in positions corresponding to positions of the plurality of light emitting structures and filling the recesses with a wavelength conversion material.

The recesses may be a polygonal cylindrical shape, a cylindrical shape, or a concave lens shape.

The light transmissive substrate may be thicker than one of the light emitting structures.

The light transmissive substrate may include SiO2.

The wavelength conversion regions may be formed by injecting a mixture including phosphor mixed with SiO2 particles into the recesses and sintering the mixture.

The method may further include measuring color characteristics of light emitted from the plurality of light emitting structures prior to performing the arranging of the plurality of light emitting structures on the support substrate.

The method may further include determining a type and an amount of a wavelength conversion material required for color compensation of the plurality of light emitting structures based on a difference between the measured color characteristics and target color characteristics and forming the plurality of wavelength conversion regions in the light transmissive substrate based on the determined type and the determined amount of the wavelength conversion material, prior to performing the bonding of the light transmissive substrate to the plurality of light emitting structures.

The method may further include measuring color characteristics of light emitted from the plurality of light emitting structures prior to performing the separating of the individual semiconductor light emitting device packages from one another.

The method may further include determining a type and an amount of a wavelength conversion material required for color compensation of the light emitting structures based on a difference between the measured color characteristics and target color characteristics and forming additional wavelength conversion regions on the light transmissive substrate based on the determined type and the determined amount of the wavelength conversion material, prior to performing the separating of the individual semiconductor light emitting device packages from one another.

The forming of the additional wavelength conversion regions may include bonding a secondary light transmissive substrate having the additional wavelength conversion regions to the light transmissive substrate.

The arranging of the plurality of light emitting structures on the support substrate may include: forming the plurality of light emitting structures on a growth substrate; forming first and second electrodes on a first surface of each light emitting structure corresponding to a surface of the second conductivity-type semiconductor layer, the first and second electrodes being connected to the first and second conductivity-type semiconductor layers, respectively; bonding the support substrate to the first surface of the plurality of light emitting structures; and removing the growth substrate from the plurality of light emitting structures.

The method may further include bonding a package substrate to the first surface of the light emitting structure prior to performing the bonding of the support substrate, the package substrate having first and second via electrodes corresponding to the first and second electrodes, respectively.

The arranging of the plurality of light emitting structures on the support substrate may include: growing the plurality of light emitting structures on the support substrate; and removing at least a portion of the light emitting structures and dividing the plurality of light emitting structures into individual light emitting structures.

According to an exemplary embodiment in the present disclosure, a method of manufacturing a semiconductor light emitting device package may include forming a plurality of light emitting structures on a growth substrate, each light emitting structure including a first conductivity-type semiconductor layer, an active layer and a second conductivity-type semiconductor layer; bonding a light transmissive substrate to the plurality of light emitting structures; removing the growth substrate from the plurality of light emitting structures, forming first and second electrodes to be connected to the first and second conductivity-type semiconductor layers, respectively, and bonding a package substrate having first and second electrode structures connected to the first and second electrodes, respectively.

According to an exemplary embodiment in the present disclosure, a method of manufacturing a semiconductor light emitting device package may include arranging a plurality of light emitting structures on a support substrate, each light emitting structure including a first conductivity-type semiconductor layer, an active layer and a second conductivity-type semiconductor layer, bonding one surface of a light transmissive substrate to the plurality of light emitting structures, the light transmissive substrate having a plurality of wavelength conversion regions corresponding to the plurality of light emitting structures, respectively; removing the support substrate, and cutting the light transmissive substrate to separate individual semiconductor light emitting device packages from one another.

The cutting of the light transmissive substrate to separate the individual semiconductor light emitting device packages from one another may be performed using a laser beam.

The method may further include micromachining the other surface of the light transmissive substrate opposing the one surface thereof on which the plurality of light emitting structures are bonded by using a chemical mechanical polishing (CMP) method prior to performing the cutting of the light transmissive substrate to separate the individual semiconductor light emitting device packages from one another.

The method may further include forming an uneven structure on the light transmissive substrate.

The bonding of the light transmissive substrate may be performed by applying water glass or silicone to the plurality of light emitting structures and heating the plurality of light emitting structures with the water glass or silicone applied thereto.

DETAILED DESCRIPTION

Exemplary embodiments in the present disclosure will now be described in detail with reference to the accompanying drawings.

In the present specification, terms such as “top,” “top surface,” “bottom,” “bottom surface,” “side (or lateral) surface,” and the like, are determined based on the drawings, and in actuality, the terms may be changed according to a direction in which a device or a package is disposed.

FIGS. 1A through 6are schematic views illustrating sequential processes in a method of manufacturing a semiconductor light emitting device package according to an exemplary embodiment in the present disclosure.FIG. 1Aillustrates that a light emitting structure120is formed on a growth substrate110, andFIG. 1Bis a cross-sectional view taken along the line A-A′ ofFIG. 1A.

A semiconductor light emitting device package100according to an exemplary embodiment may be a chip scale package (CSP) or a wafer level package (WLP).

Referring toFIG. 1A, a light emitting structure120including a first conductivity-type semiconductor layer121, an active layer122and a second conductivity-type semiconductor layer123may be formed on the growth substrate110.

The growth substrate110may be provided as a substrate for semiconductor growth, and may be formed of an insulating, conductive or semiconductor material, such as sapphire, SiC, MgAl2O4, MgO, LiAlO2, LiGaO2, GaN or the like. A sapphire substrate comprises a crystal having Hexa-Rhombo R3C symmetry. The sapphire substrate has a lattice constant of 13.001 Å along a C-axis and a lattice constant of 4.758 Å along an A-axis and includes a C (0001) plane, an A (11-20) plane, an R (1-102) plane, and the like. The C plane is mainly used as a substrate for nitride semiconductor growth because it facilitates the growth of a nitride film and is stable at high temperatures. When an Si substrate is used as the growth substrate110, the Si substrate may be easily formed to have a large diameter. In an embodiment, a buffer layer may be further formed on a surface of the growth substrate110on which the first conductivity-type semiconductor layer121is to be formed prior to forming the light emitting structure120.

The light emitting structure120may be formed by sequentially stacking the first conductivity-type semiconductor layer121, the active layer122and the second conductivity-type semiconductor layer123on the growth substrate110.

The first and second conductivity-type semiconductor layers121and123may be formed of a nitride semiconductor material having a composition of AlxInyGa(1-x-y)N (where 0≦x<1, 0≦y<1, and 0≦x+y<1) and doped with n-type and p-type impurities, respectively. Representative semiconductor materials may include GaN, AlGaN, and InGaN. The n-type impurities may be at least one of Si, Ge, Se, or Te, and the p-type impurities may be at least one of Mg, Zn, or Be. The first and second conductivity-type semiconductor layers121and123may be grown using metal organic chemical vapor deposition (MOCVD), hydride vapor phase epitaxy (HVPE), molecular beam epitaxy (MBE), or the like. In an exemplary embodiment, the first and second conductivity-type semiconductor layers121and123may be formed of GaN, and may be formed on the growth substrate110. The growth substrate110may be formed of Si.

A mesa-etched surface M may be formed in a region of the light emitting structure120. The region of the first conductivity-type semiconductor layer121exposed through a mesa-etching process may be used as a device isolation region. The mesa-etched surface M may be formed by an appropriate etching process known in the art such as, for example, inductive coupled plasma reactive ion etching (ICP-RIE).

First and second electrodes130aand130bmay be formed on the first and second conductivity-type semiconductor layers121and123, respectively. In an embodiment, the first electrodes130amay be disposed on the mesa-etched surface M of the first conductivity-type semiconductor layer121exposed by etching a portion of the light emitting structure120. The first and second electrodes130aand130bmay be disposed to expose surfaces thereof to which a package substrate140is bonded in a subsequent process. The first and second electrodes130aand130bmay have different shapes and may be spaced apart from each other, and the shapes and arrangements thereof are not limited to those illustrated inFIG. 1B.

In an embodiment, the other surface of the growth substrate110opposing one surface thereof on which the light emitting structure120is grown may be processed through micromachining using a chemical mechanical polishing (CMP) method, thereby thinning the growth substrate110. In an embodiment, the CMP method is performed for planarization of a surface of an object through a combination of chemical and mechanical actions. A portion of the other surface of the growth substrate110may be chemically etched or the process of thinning the growth substrate110may be omitted if the growth substrate is sufficiently thin.

An oxide film may be formed on the light emitting structure120to cover the first and second electrodes130aand130band a surface of the oxide film may be flattened, such that the bonding of the package substrate140may be further facilitated in a subsequent process.

Referring toFIG. 2, the color characteristics of the plurality of light emitting structures120may be measured. The color characteristics may be measured using a method of applying power to individual light emitting structures120and measuring light emitted from the light emitting structures120.

The power may be applied to the first and second electrodes130aand130bof the light emitting structures120using a probe P, and the emitted light may be measured through a light receiving sensor S. The probe P and the light receiving sensor S may be provided as separate devices, or may be included in a single measuring device T.

The color characteristics may be at least one of wavelength, power, full width at half maximum (FWHM) and color coordinates of light emitted from the light emitting structures120. In an exemplary embodiment, an average wavelength of light emitted from the light emitting structures120may be measured.

Various methods for measuring the color characteristics, such as a method of irradiating ultraviolet light or a laser beam onto the surfaces of the light emitting structures120and measuring light reflected from the surfaces, may be used.

The growth of the plurality of light emitting structures to be manufactured on a single wafer may be different due to differences in temperature, supply gas flow, and the like, during the manufacturing processes. According to an embodiment, they differ in terms of a wavelength of light, an amount of light, and the like.

Thereafter, as illustrated inFIG. 3, the package substrate140may be bonded to the light emitting structures120.

First and second bonding pads143aand143bmay be formed on the package substrate140. By electrically connecting the first and second electrodes130aand130bto the first and second bonding pads143aand143b, the light emitting structures120may be mounted on the package substrate140. The first and second electrodes130aand130bmay be electrically connected to the first and second bonding pads143aand143busing a conductive adhesive such as solder bumps or the like, but the connections thereof are not limited thereto.

First and second via electrodes142aand142bmay be formed to penetrate through the package substrate140from one surface of the package substrate140to the other surface thereof in a thickness direction, thereby making electrical connections with the first and second electrodes130aand130b.

The first and second via electrodes142aand142bmay be formed by bonding the package substrate140to the light emitting structures120, forming first and second via holes141aand141bpenetrating through one surface and the other surface of the package substrate140, and filling the first and second via holes141aand141bwith a conductive paste. Alternatively, the first and second via electrodes142aand142bmay be formed by plating the first and second via holes141aand141bwith a conductive material. However, the formation of the first and second via electrodes is not limited thereto, and the first and second via electrodes142aand142bmay be formed and bonded prior to bonding the package substrate140to the light emitting structures120.

The first and second bonding pads143aand143bmay be disposed on one surface and the other surface of the package substrate140to which both ends of the first and second via electrodes142aand142bare exposed, such that both surfaces of the package substrate140may be electrically connected to each other. The package substrate140may be a substrate for manufacturing CSPs or WLPs in which packages are completely formed on the wafer level.

The package substrate140may be a substrate formed of Si, sapphire, ZnO, GaAs, SiC, MgAl2O4, MgO, LiAlO2, LiGaO2, GaN or the like. In an exemplary embodiment, an Si substrate may be used. However, a material for the package substrate140is not limited thereto. Depending on heat dissipation properties and electrical connections of semiconductor light emitting device packages manufactured by mounting the light emitting structures120on the package substrate140, the package substrate140may be formed of an organic resin material containing epoxy, triazine, silicone, polyimide, or the like, or another organic resin material. To improve the heat dissipation properties and light emitting efficiency, the package substrate140may be formed of a ceramic material having high heat resistance, superior thermal conductivity, high reflective efficiency, and the like. For example, Al2O3, AlN, or the like, may be used.

Besides the aforementioned substrate, a printed circuit board, a lead frame, or the like may be used for the package substrate140in an exemplary embodiment.

Referring toFIG. 4, a support substrate160may be bonded to the bottom of the package substrate140, and the growth substrate110may be removed. Prior to the bonding of the support substrate160, an adhesive150may be applied to the bottom of the package substrate140. The support substrate160may be provided as a support body for preventing the light emitting structures120from being damaged in subsequent manufacturing processes, and various types of substrate may be bonded. In an exemplary embodiment, an Si substrate may be bonded.

The support substrate160may serve as a support body supporting the light emitting structures120in a process for separating the growth substrate110from the light emitting structures120, and thus, after the support substrate160is bonded, the growth substrate110may be separated from the light emitting structures120.

The growth substrate110may be separated from the light emitting structures120through a laser lift off (LLO) process. Here, a laser used in the LLO process may be at least one of an excimer laser having a wavelength of 193 nm, 248 nm, or 308 nm, a Nd:YAG laser, a He—Ne laser, and an argon (Ar) ion laser.

In an embodiment, the growth substrate110may be removed by a physical method such as grinding, polishing, lapping, or the like.

Referring toFIG. 5, a light transmissive substrate180having a plurality of wavelength conversion regions182may be bonded to portions of the light emitting structures120exposed after the growth substrate110is removed, and then the support substrate160bonded in the previous process may be separated by using the light transmissive substrate180as a support body.

FIG. 14is a view of the light transmissive substrate ofFIG. 5, andFIG. 15is a side cross-sectional view of the light transmissive substrate ofFIG. 14taken along line B-B′.FIG. 16illustrates the arrangement of the wavelength conversion regions on the light transmissive substrate, andFIGS. 17A through 17Care views of modified examples of recesses formed in the light transmissive substrate.

The light transmissive substrate180may be formed of a transparent material, and any material may be used therefor so long as it has a degree of hardness sufficient to securely support the light emitting structures120during the separation of the support substrate160. For example, the light transmissive substrate180may be formed of a light-transmissive insulating material, and may be formed of at least one of glass, quartz, transparent resin, SiO2, SiNx, Al2O3, HfO, TiO2 and ZrO.

When the light transmissive substrate180is formed of glass, it may be formed of a glass material which is not melted even at high temperatures, such as Pyrex®, Zerodur®, or the like.

The light transmissive substrate180may be a plate-like substrate having one surface and the other surface opposing each other, and may have the form of a wafer as illustrated inFIG. 14. The light transmissive substrate180may be formed of an insulating material as described above, and may be formed to have a thickness of about 10 μm to about 500 μm.

The bonding of the light transmissive substrate180may be performed by applying a light transmissive adhesive170such as water glass or silicone to the exposed surfaces of the light emitting structures120and heating the same at a temperature of approximately 400° C. or below. In an embodiment, the bonding of the light transmissive substrate180may be performed through anodic bonding or fusion bonding at a temperature of approximately 400° C. or below. When the light transmissive substrate180is bonded at a relatively low temperature of 400° C. or below, damage to the light emitting structures120that may be caused by heat when the light transmissive substrate is bonded at a relatively high temperature may be reduced.

The light transmissive substrate180may have the wavelength conversion regions182in positions corresponding to those of the light emitting structures120. The wavelength conversion regions182may be formed to be exposed to a surface of the light transmissive substrate180in contact with the light emitting structures120, but the arrangement thereof is not limited thereto. The wavelength conversion regions182may be disposed inside the light transmissive substrate180.

The wavelength conversion regions182may be obtained by forming a plurality of recesses181in one surface of the light transmissive substrate180and filing the recess181with a wavelength conversion material.

The plurality of recesses181may be formed to have a predetermined depth in positions corresponding to those of the light emitting structures120, respectively. The recess181may have various shapes. For example, referring toFIG. 17A, when viewed from the top of the light transmissive substrate180, the recess181may be a quadrangular cylindrical shape. Referring toFIG. 17B, when viewed from the top of a light transmissive substrate180′, a recess181′ may be a cylindrical shape. Furthermore, as illustrated inFIG. 17C, when viewed from the top of a light transmissive substrate180″, a recess181″ may be formed to have a concave lens shape.

The plurality of recesses181may be formed to have the same depth or different depths. Referring toFIG. 15, a plurality of recesses181a,181b, and181cmay be formed to have different depths according to regions. The depths thereof may be varied according to the measured color characteristics of the plurality of light emitting structures120obtained in the previous measuring operation. The shapes of the wavelength conversion regions182a,182b, and182cformed in the light transmissive substrate180may be varied by adjusting the shape of the recess181.

The wavelength conversion material may be a material in which at least one type of a phosphor, a quantum dot, or the like, is dispersed in a silicone resin or the like. In an embodiment, the phosphor or the quantum dot may be dispersed in a material having the same composition as that of the light transmissive substrate180, or may be mixed with a material having the same composition as that of the light transmissive substrate180.

The wavelength conversion regions182may be formed by filling the plurality of recesses181formed in the light transmissive substrate180with the wavelength conversion material and curing the wavelength conversion material. In an embodiment, the wavelength conversion regions182may be formed by mixing the phosphor or the quantum dot with a material such as silicone, filling the recesses181with the mixture, and heat-curing the mixture. In an embodiment, the wavelength conversion regions182may be formed by mixing the phosphor or the quantum dot with glass particles, filling recesses of the light transmissive substrate180formed of glass with the mixture, and sintering the mixture.

The plurality of recesses181may be filled with the same type and the same amount of the wavelength conversion material. Alternatively, a type and an amount of a wavelength conversion material filling individual recesses181may be changed according to the measured color characteristics of the plurality of light emitting structures120obtained in the previous measuring operation. The recesses181may be grouped according to positions thereof, each group of which may be filled with the same type and the same amount of the wavelength conversion material.

The process of forming the wavelength conversion regions182according to the measured color characteristics of the plurality of light emitting structures120obtained in the measuring operation will be detailed below.

A type and an amount of a wavelength conversion material required for color compensation of the light emitting structures120may be determined based on a difference between the previously measured color characteristics and color characteristics targeted in the manufacturing process (hereinafter, referred to as “target color characteristics”).

To determine the type and amount of a wavelength conversion material required for the color compensation of the light emitting structures120, it may be determined whether or not the previously measured color characteristics correspond to the target color characteristics. When the previously measured color characteristics conform to the target color characteristics, it may be determined that the wavelength conversion regions182are formed by filling the recesses181of the light transmissive substrate180with the wavelength conversion material in a standard amount for converting the light emitted from the light emitting structures120into white light.

When the previously measured color characteristics do not conform to the target color characteristics, a type or an amount of a wavelength conversion material may be adjusted, so that the light emitted from the light emitting structures120is converted into light having target color characteristics after passing through the wavelength conversion material.

The type and amount of a wavelength conversion material may be determined by quantifying a rate of change of color characteristics with respect to the type and amount of the wavelength conversion material and calculating the type and amount of a wavelength conversion material required based on the change rate of the color characteristics.

For example, when a wavelength of light measured is relatively short with respect to the target color characteristics, an amount of phosphors or quantum dots per unit volume of the wavelength conversion material capable of increasing wavelength of light may be increased or depths of the recesses181may be increased in the light transmissive substrate180, so as to convert the light emitted from the light emitting structures120into light having a longer wavelength. The amount of the wavelength conversion material may be controlled by adjusting the depths of the recesses181in the light transmissive substrate180, and the type of the wavelength conversion material may be controlled by changing types of phosphors or quantum dots and increasing or decreasing a mixing ratio thereof.

Therefore, by changing the shapes of the recesses181formed in the light transmissive substrate180and the type and amount of a wavelength conversion material filling the recesses181, the wavelength conversion regions182allowing for the emission of light satisfying the target color characteristics may be formed.

FIG. 16illustrates the arrangement of the wavelength conversion regions182, according to the measured color characteristics of the plurality of light emitting structures120manufactured on a single wafer. As illustrated inFIG. 16, similar wavelength conversion regions182are distributed in regions C1to C4based on concentric circles. The distribution is because the growth of the plurality of light emitting structures120to be manufactured on a single wafer is different due to differences in temperature, supply gas flow, and the like, during the manufacturing processes, and accordingly, they differ in terms of a wavelength of light, an amount of light, and the like. In an embodiment, while the wafer is rotated at high speed during the injecting of supply gas, the concentration of the supply gas may differ based on concentric circles.

According to an exemplary embodiment, the most appropriate wavelength conversion regions182may be provided to respective light emitting structures120having different color characteristics, and thus, the resultant color characteristics may be improved.

Since the light transmissive substrate180has light transmissive properties, the light emitted from the light emitting structure120may pass through the light transmissive substrate180, and may serve as a protective layer encapsulating the wavelength conversion regions182. Since the light transmissive substrate180is bonded to the light emitting structures120, the effect of preventing moisture permeation may be expected.

The light transmissive substrate180has a certain degree of hardness sufficient to firmly support the light emitting structures120during the separation of the support substrate160, and thus it may be used as a support body in separating the support substrate160. Therefore, a separate support body may not be necessary in removing the support substrate160.

The plurality of light transmissive substrates may be stacked, and details thereof will be provided with respect to another exemplary embodiment in the present disclosure.

In an embodiment, the other surface of the light transmissive substrate180opposing one surface thereof to which the light emitting structures120are bonded may be processed through micromachining using a chemical mechanical polishing (CMP) method, thereby forming a thin light transmissive substrate180a. However, the present operation is not limited thereto, and a portion of the other surface of the light transmissive substrate180may be chemically etched or the process of thinning the light transmissive substrate180may be omitted if the light transmissive substrate180is sufficiently thin. This operation reduces the thickness of the light transmissive substrate180, thereby improving light extraction efficiency and reducing damage to the light transmissive substrate180that may be caused during a subsequent separation process of individual semiconductor light emitting device packages100.

In an embodiment, an uneven structure may be formed on the light transmissive substrate180, whereby the light extraction efficiency may be further improved. Such an uneven structure may be formed by performing wet etching or plasma-based dry etching on the surface of the light transmissive substrate180.

Then, as illustrated inFIG. 6, the light transmissive substrate180, the light emitting structures120and the package substrate140may be cut using a laser beam L and individual semiconductor light emitting device packages100may be separated from one another. At this time, the cutting process may be performed to separate the plurality of wavelength conversion regions182formed in the light transmissive substrate180from one another. However, the method of separating the semiconductor light emitting device packages100is not limited thereto, and a separation method using a blade or a water jet may be employed.

Hereinafter, a method of manufacturing a semiconductor light emitting device package according to another exemplary embodiment in the present disclosure will be described.FIGS. 7 through 12are schematic views illustrating sequential processes in a method of manufacturing a semiconductor light emitting device package according to another exemplary embodiment in the present disclosure, andFIG. 13illustrates a modified example of the exemplary embodiment illustrated inFIGS. 7 through 12.

In an embodiment, the color characteristics of light emitting structures220are not measured prior to bonding a light transmissive substrate280thereto. The light emitting structures220in the present exemplary embodiment are inserted into recesses281formed in the light transmissive substrate280. The present exemplary embodiment will be described on the basis of the aforementioned differences.

Referring toFIG. 7, a light emitting structure220including a first conductivity-type semiconductor layer221, an active layer222and a second conductivity-type semiconductor layer223may be formed on a support substrate210. The support substrate210may be a growth substrate for growing the light emitting structure220.

However, unlike the mesa-etched surface M formed in the region of the light emitting structure120in the previous exemplary embodiment, a region of the light emitting structure220may be etched to expose a corresponding portion of the support substrate210, thereby forming a device isolation region (ISO).

Referring toFIGS. 8 and 9, the light transmissive substrate280may be bonded to the support substrate210.

In an embodiment, the color characteristics of individual light emitting structures120may be measured and then the wavelength conversion regions182may be formed in light of the measured color characteristics. In an exemplary embodiment, wavelength conversion regions282may be formed in the light transmissive substrate280without measuring the color characteristics of the light emitting structures220.

The recesses281of the light transmissive substrate280for the wavelength conversion regions282may have the same shape, and may be filled with the same type and the same amount of a wavelength conversion material. However, the formation of the wavelength conversion regions282is not limited thereto. For example, the shapes of the recesses281and the type and amount of a wavelength conversion material appropriate for converting light emitted from the light emitting structures220may be predicted on the basis of the results of statistics through preliminary research in manufacturing processes, and the wavelength conversion regions282may be formed on the basis of the predicted results.

A width W1and a depth H1of the recess281formed in the light transmissive substrate280may be greater than a width W2and a height H2of the light emitting structure220. Therefore, when the wavelength conversion regions282formed in the light transmissive substrate280and the light emitting structures220formed on the support substrate210are arranged to correspond to one another and are bonded to one another, the light emitting structures220may be inserted into the wavelength conversion regions282, respectively, as illustrated inFIG. 9.

Referring toFIG. 10, the support substrate210may be separated from the light emitting structures220, and first and second electrodes230aand230bmay be formed on the bottom of the light emitting structures220.

As described above, the light transmissive substrate280has a degree of hardness sufficient to allow the light emitting structures220to be firmly supported during the separation of the support substrate210, and thus a separate support body is not necessary in removing the support substrate210. Therefore, the simplicity of the manufacturing process may be achieved.

The support substrate210may be separated from the light emitting structures220through an LLO process, and may be removed by a physical method such as grinding, polishing, lapping, or the like.

The method of forming the first and second electrodes230aand230bon the bottom of the light emitting structure220will be described in detail. First, in order to form the first electrode230a, a via hole may be formed to penetrate through the second conductivity-type semiconductor layer221and the active layer222by performing an etching process using a mask, and then an insulating layer231may be formed. Then, a conductive ohmic-contact material may be deposited on the bottom of the light emitting structure220, thereby forming the first and second electrodes230aand230b. At this time, the first and second electrodes230aand230bmay be formed of various materials or may have a multilayer structure so as to improve ohmic-contact or reflective characteristics.

After forming the first and second electrodes230aand230b, at least one light transmissive substrate may be further stacked on the light transmissive substrate280. Details thereof will be provided below with reference to a modified example.

Referring toFIG. 11, a package substrate240may be bonded to the light emitting structures220. Prior to the bonding of the package substrate240, an adhesive270may be applied to the bottom of the light transmissive substrate280and the light emitting structures220. First and second bonding pads243aand243bmay be formed on the package substrate240. By electrically connecting the first and second electrodes230aand230bto the first and second bonding pads243aand243b, the light emitting structures220may be mounted on the package substrate240. The first and second electrodes230aand230bmay be electrically connected to the first and second bonding pads243aand243busing a conductive adhesive such as solder bumps or the like, but the connections thereof are not limited thereto.

In an embodiment, first and second via electrodes242aand242bmay be formed to penetrate through the package substrate240from one surface of the package substrate240to the other surface thereof in a thickness direction, thereby making electrical connections with the first and second electrodes230aand230b. The first and second via electrodes242aand242bmay be formed by bonding the package substrate240to the light emitting structures220, forming first and second via holes241aand241bpenetrating through one surface and the other surface of the package substrate240, and filling the first and second via holes241aand241bwith a conductive paste. Alternatively, the first and second via electrodes242aand242bmay be formed by plating the first and second via holes241aand241bwith a conductive material. However, the formation of the first and second via electrodes is not limited thereto, and the first and second via electrodes242aand242bmay be formed and bonded prior to bonding the package substrate240to the light emitting structures220.

Then, as illustrated inFIG. 12, the light transmissive substrate280and the package substrate240may be cut using a laser beam L and individual semiconductor light emitting device packages100may be separated from one another. At this time, the cutting process may be performed to separate the plurality of wavelength conversion regions282formed in the light transmissive substrate280from one another. However, the method of separating the semiconductor light emitting device packages200is not limited thereto, and a separation method using a blade or a water jet may be employed.

Hereinafter, a modified example of the exemplary embodiment illustrated inFIGS. 7 through 12will be described.FIG. 13illustrates a modified example of the exemplary embodiment illustrated inFIGS. 7 through 12.

A semiconductor light emitting device package300in the modified example may include a light emitting structure320having first and second conductivity-type semiconductor layers321and323and an active layer322. In an embodiment, first and second electrodes330aand330band an insulating layer331may be formed on the first and second conductivity-type semiconductor layers321and323.

A package substrate340may be bonded to the bottom of the light emitting structure320. First and second bonding pads343aand343bmay be formed on the package substrate340. By electrically connecting the first and second electrodes330aand330bto the first and second bonding pads343aand343b, the light emitting structures320may be mounted on the package substrate340. Prior to the bonding of the package substrate340, an adhesive370may be applied to the bottom of the light transmissive substrate380and the light emitting structures320.

In an embodiment, first and second via electrodes342aand342bmay be formed to penetrate through the package substrate340from one surface of the package substrate340to the other surface thereof in a thickness direction, thereby making electrical connections with the first and second electrodes330aand330b.

A plurality of light transmissive substrates380and390may be bonded to the light emitting structures320, wherein an uneven structure393may be formed on an exposed top surface of the light transmissive substrate390, whereby light extraction efficiency may be further improved. Such an uneven structure may be formed by performing wet etching or plasma-based dry etching on the surface of the light transmissive substrate390. Here, recesses381and391formed in the light transmissive substrates380and390for wavelength conversion regions382and392, respectively, may have different shapes and may be filled with different types and amounts of a wavelength conversion material.

Prior to stacking the light transmissive substrate390, the color characteristics of the light emitting structures320may be measured, and a type and an amount of a wavelength conversion material required for color compensation of the light emitting structures320may be determined based on a difference between the measured color characteristics and color characteristics targeted in the manufacturing process. The wavelength conversion region392of the light transmissive substrate390may be determined on the basis of the type and amount of a wavelength conversion material determined.

The semiconductor light emitting device packages according to the exemplary embodiments in the present disclosure may be usefully applied to various products.

FIGS. 18 and 19illustrate examples of a backlight unit to which a semiconductor light emitting device package according to an exemplary embodiment in the present disclosure is applied.

With reference toFIG. 18, a backlight unit1000may include at least one light source1001mounted on a substrate1002and at least one optical sheet1003disposed thereabove. The semiconductor light emitting device packages according to the above-described exemplary embodiments may be used as the light source1001.

The light source1001in the backlight unit1000ofFIG. 18emits light toward a liquid crystal display (LCD) device disposed thereabove, whereas a light source2001mounted on a substrate2002in a backlight unit2000according to another embodiment illustrated inFIG. 19emits light laterally, and the light is incident to a light guide plate2003such that the backlight unit2000may serve as a surface light source. The light travelling to the light guide plate2003may be emitted upwardly and a reflective layer2004may be disposed below the light guide plate2003in order to improve light extraction efficiency.

FIG. 20is an exploded perspective view illustrating an example of a lighting device to which a semiconductor light emitting device package according to an exemplary embodiment in the present disclosure is applied.

A lighting device3000illustrated inFIG. 20is a bulb-type lamp by way of example, and includes a light emitting module3003, a driver3008, and an external connector3010.

In an embodiment, the lighting device3000may further include exterior structures such as external and internal housings3006and3009, a cover3007, and the like. The light emitting module3003may include a light source3001and a circuit board3002on which the light source3001is mounted. For example, the first and second electrodes of the above-described semiconductor light emitting device package may be electrically connected to electrode patterns of the circuit board3002. In an exemplary embodiment, a single light source3001is mounted on the circuit board3002by way of example; however, a plurality of light sources may be mounted thereon as necessary.

The external housing3006may serve as a heat radiator and may include a heat sink plate3004directly contacting the light emitting module3003to thereby improve heat dissipation and heat radiating fins3005surrounding a lateral surface of the lighting device3000. The cover3007may be disposed above the light emitting module3003and have a convex lens shape. The driver3008may be disposed inside the internal housing3009and be connected to the external connector3010such as a socket structure to receive power from an external power source. In addition, the driver3008may convert the received power into power appropriate for driving the light source3001of the light emitting module3003and supply the converted power thereto. For example, the driver3008may be provided as an AC-DC converter, a rectifying circuit part, or the like.

FIG. 21illustrates an example of a headlamp to which a semiconductor light emitting device package according to an exemplary embodiment in the present disclosure is applied.

With reference toFIG. 21, a headlamp4000used in a vehicle or the like may include a light source4001, a reflector4005and a lens cover4004, and the lens cover4004may include a hollow guide part4003and a lens4002. The semiconductor light emitting device packages according to the above-described exemplary embodiments may be used as the light source4001.

The headlamp4000may further include a heat radiator4012dissipating heat generated by the light source4001outwardly. The heat radiator4012may include a heat sink4010and a cooling fan4011in order to effectively dissipate heat. In addition, the headlamp4000may further include a housing4009allowing the heat radiator4012and the reflector4005to be fixed thereto and supported thereby. The housing4009may include a body4006and a central hole4008formed in one surface thereof, to which the heat radiator4012is coupled.

The housing4009may include a forwardly open hole4007formed in the other surface thereof integrally connected to one surface thereof and bent in a direction perpendicular thereto. The reflector4005may be fixed to the housing4009, such that light generated by the light source4001may be reflected by the reflector4005, pass through the forwardly open hole4007, and be emitted outwardly.

As set forth above, in a method of manufacturing a semiconductor light emitting device package according to exemplary embodiments in the present disclosure, a light transmissive substrate having wavelength conversion regions is used as a support substrate, whereby manufacturing time may be reduced.

While exemplary embodiments have been shown and described above, it will be apparent to those skilled in the art that modifications and variations could be made without departing from the scope of the invention as defined by the appended claims.