Patent Publication Number: US-2013236997-A1

Title: Method of fabricating light emitting device

Description:
CROSS-REFERENCE TO RELATED APPLICATION 
     This application claims priority from Korean Patent Application No. 10-2012-0023817, filed on Mar. 8, 2012 in the Korean Intellectual Property Office, the disclosure of which is incorporated herein by reference in its entirety. 
     BACKGROUND 
     1. Field 
     Exemplary embodiments relate to a light emitting device and a method of fabricating a light emitting device. 
     2. Description of the Related Art 
     A light emitting diode (LED), commonly utilized in simple small home appliances and the field of special interiors, has been applied to multiple applications and various usage environments including a backlight unit (BLU) for a display, a general illumination device, and an electric device, and efforts of enhancing LED efficiency have continued to be made. 
     Also, demand for a degree of freedom in designing products employing an LED is increasing. For example, the width of a BLU continues to be reduced to allow, for example, an LED TV to be thinner, and the size of LED products is demanded to be reduced in order to implement various forms of illumination devices or electrical devices. 
     A related art general LED package is fabricated such that an LED layer as a lamination structure of a semiconductor layer is grown on a growth substrate, the LED layer is transferred to a new support substrate, and then, an LED chip formed by removing the growth substrate is assembled on a package substrate. 
     Thus, in order to manufacture a final product, a separate support substrate is to be prepared and the LED layers are to be bonded to the support substrate, making the overall fabrication process complicated and degrading productivity. 
     Also, since an additional component such as the support substrate is used, production costs may be increased according to the increase in the number of components, and it is not easy to make the product thinner due to the size of the support substrate. 
     SUMMARY 
     One or more exemplary embodiments provide a method of fabricating a light emitting device having a reduced number of components by omitting a support substrate in fabricating a light emitting device such as a light emitting diode (LED) package, and simplifying the overall process thereof. 
     According to an aspect of an exemplary embodiment, there is provided a method for fabricating a light emitting device, the method including: forming a plurality of light emitting laminates in which a first conductivity-type semiconductor layer, an active layer, and a second conductivity-type semiconductor layer are sequentially laminated on a growth substrate; mounting the growth substrate on a substrate including a plurality of terminal units each including a pair of electrode terminals, such that the plurality of light emitting laminates respectively face the plurality of terminal units in a corresponding manner; joining and electrically connecting the second conductivity-type semiconductor layer of each of the plurality of light emitting laminates to a first electrode terminal, among the pair of electrode terminals, of a corresponding terminal unit; removing the growth substrate such that the first conductivity-type semiconductor layer of each of the plurality of light emitting laminates is exposed; forming an insulating layer on a lateral surface of each of the plurality of light emitting laminates; and electrically connecting the exposed first conductivity-type semiconductor layer of each of the plurality of light emitting laminates to a second electrode terminal, among the pair of electrode terminals, of the corresponding terminal unit. 
     The forming of the light emitting laminates may include: sequentially growing the first conductivity-type semiconductor layer, the active layer, and the second conductivity-type semiconductor layer on the growth substrate; and removing portions of the grown first conductivity-type semiconductor layer, the grown active layer, and the grown second conductivity-type semiconductor layer other than portions forming the plurality of light emitting laminates. 
     An electroconductive adhesive may be provided on the second conductivity-type semiconductor layer of each of the plurality of light emitting laminates to join the plurality of light emitting laminates and the plurality of terminal units in the corresponding manner. 
     The substrate may further include a recess which accommodates a light emitting laminate. 
     At least portions of the pair of electrode terminals of the terminal unit may be within the recess. 
     The second conductivity-type semiconductor layer may be joined to the first electrode terminal within the recess. 
     The method may further include modifying a surface of the first conductivity-type semiconductor layer after the removing of the growth substrate. 
     The method may further include forming a current spreading layer on the exposed first conductivity-type semiconductor layer after the removing of the growth substrate. 
     The method may further include forming a wavelength conversion layer on the substrate to cover a light emitting laminate. 
     The method may further include forming a molded unit on the substrate to cover a light emitting laminate. 
     The method may further include cutting to separate the plurality of light emitting laminates. 
     According to an aspect of another exemplary embodiment, there is provided a method for fabricating a light emitting device, the method including: forming a plurality of light emitting laminates in which a first conductivity-type semiconductor layer, an active layer, and a second conductivity-type semiconductor layer are sequentially laminated on a growth substrate; removing portions of the second conductivity-type semiconductor layer and the active layer from the plurality of light emitting laminates to expose portions of the first conductivity-type semiconductor layer; mounting the growth substrate on a substrate including a plurality of terminal units each including a pair of electrode terminals, such that the plurality of light emitting laminates respectively face the plurality of terminal units in a corresponding manner; joining and electrically connecting the second conductivity-type semiconductor layer of each of the plurality of light emitting laminates to a first electrode terminal, among the pair of electrode terminals, of a corresponding terminal unit among the plurality of terminal units, and joining and electrically connecting the first conductivity-type semiconductor layer of each of the plurality of light emitting laminates to a second electrode terminal, among the pair of electrode terminals, of the corresponding terminal unit; and removing the growth substrate such that the first conductivity-type semiconductor layer of each of the plurality of light emitting laminates is exposed. 
     The forming the light emitting laminates may include: sequentially growing the first conductivity-type semiconductor layer, the active layer, and the second conductivity-type semiconductor layer on the growth substrate; and removing portions of the grown first conductivity-type semiconductor layer, the grown active layer, and the grown second conductivity-type semiconductor layer other than portions forming the plurality of light emitting laminates. 
     An electroconductive adhesive may be provided on the second conductivity-type semiconductor layer and the exposed first conductivity-type semiconductor layer of each of the plurality of light emitting laminates to join the plurality of light emitting laminates and the plurality of terminal units in the corresponding manner. 
     The substrate may further include: a recess which accommodates a light emitting laminate. 
     At least portions of the pair of electrode terminals may be within the recess. 
     The second conductivity-type semiconductor layer may be joined to the first electrode terminal within the recess and the exposed first conductivity-type semiconductor layer may be joined to the second electrode terminal within the recess by the electroconductive adhesive. 
     The method may further include modifying a surface of the first conductivity-type semiconductor layer after the removing of the growth substrate. 
     The method may further include forming a current spreading layer on the exposed first conductivity-type semiconductor layer after the removing of the growth substrate. 
     The method may further include forming a wavelength conversion layer on the substrate to cover a light emitting laminate. 
     The method may further include forming a molded unit on the substrate to cover a light emitting laminate. 
     The method may further include cutting to separate the plurality of light emitting laminates. 
     According to an aspect of another exemplary embodiment, there is provided a method for fabricating a light emitting device, the method including: mounting a growth substrate on a substrate including a plurality of terminal units each including a pair of electrode terminals, such that a plurality of light emitting laminates on the growth substrate respectively face the plurality of terminal units in a corresponding manner, the plurality of light emitting laminates including a first conductivity-type semiconductor layer, an active layer, and a second conductivity-type semiconductor layer that are sequentially laminated on a growth substrate; joining and electrically connecting the second conductivity-type semiconductor layer of each of the plurality of light emitting laminates to a first electrode terminal, among the pair of electrode terminals, of a corresponding terminal unit among the plurality of terminal units; removing the growth substrate such that the first conductivity-type semiconductor layer of each of the plurality of light emitting laminates is exposed; and electrically connecting the exposed first conductivity-type semiconductor layer of each of the plurality of light emitting laminates to a second electrode terminal, among the pair of electrode terminals, of the corresponding terminal unit. 
    
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
       The above and other aspects, features and other advantages will be more clearly understood from the following detailed description taken in conjunction with the accompanying drawings, in which: 
         FIGS. 1 through 3  and  4 A,  5 A,  6 A,  7 A,  8 A,  9 A,  10 A,  11 A,  12 A, and  13 A are views schematically illustrating respective steps of a method of fabricating a light emitting device according to an exemplary embodiment; 
         FIGS. 4B ,  5 B,  6 B,  7 B,  8 B,  9 B,  10 B,  11 B,  12 B, and  13 B are views schematically illustrating respective steps of a method of fabricating a light emitting device according to another exemplary embodiment; 
         FIG. 14A  is a view schematically showing a light emitting device fabricated through the method of fabricating a light emitting device according to an exemplary embodiment; 
         FIG. 14B  is a view schematically showing a light emitting device fabricated through the method of fabricating a light emitting device according to another exemplary embodiment; 
         FIGS. 15A and 15B  are views schematically showing a modification of a light emitting device fabricated according to an exemplary embodiment; 
         FIG. 16  is a view schematically showing another modification of a light emitting device fabricated according to an exemplary embodiment; 
         FIGS. 17 through 20  are views schematically illustrating respective steps of a method of fabricating a light emitting device according to another exemplary embodiment; and 
         FIG. 21  is a view schematically showing a light emitting device fabricated through a method of fabricating a light emitting device according to another exemplary embodiment. 
     
    
    
     DETAILED DESCRIPTION OF EXEMPLARY EMBODIMENTS 
     Exemplary embodiments will now be described in detail referring to the accompanying drawings. 
     Exemplary embodiments may, however, be embodied in many different forms and should not be construed as being limited to the exemplary embodiments set forth herein. 
     Rather, these exemplary embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the inventive concept to those skilled in the art. 
     In the drawings, the shapes and dimensions of elements may be exaggerated for clarity, and the same reference numerals will be used throughout to designate the same or like components. 
     A method of fabricating a light emitting device according to an exemplary embodiment will be described with reference to  FIGS. 1 through 13B .  FIGS. 1 through 3  and  4 A,  5 A,  6 A,  7 A,  8 A,  9 A,  10 A,  11 A,  12 A, and  13 A are views schematically illustrating respective steps of a method of fabricating a light emitting device according to an exemplary embodiment, and  FIGS. 1 through 3  and  4 B,  5 B,  6 B,  7 B,  8 B,  9 B,  10 B,  11 B,  12 B, and  13 B are views schematically illustrating respective steps of a method of fabricating a light emitting device according to a modification of  FIGS. 4A to 13A .  FIG. 14A  is a view schematically showing a light emitting device fabricated through the method of fabricating a light emitting device according to the foregoing exemplary embodiment, and  FIG. 14B  is a view schematically showing a light emitting device fabricated through the method of fabricating a light emitting device according to the foregoing modification. 
     First, as illustrated in  FIG. 1 , a first conductivity-type semiconductor layer  21 , an active layer  22 , and a second conductivity-type semiconductor layer  23  are sequentially grown on a growth substrate  10  to form an LED layer  20 ′. The LED layer  20 ′ is a type of semiconductor layer that is, for example, deposited and grown on the growth substrate  10  through a chemical vapor deposition device, or the like. 
     As the growth substrate  10 , a sapphire substrate, a SiC substrate, or the like, may be used, and various other types of substrate may also be used. 
     The first conductivity-type semiconductor layer  21  and the second conductivity-type semiconductor layer  23  may be an n-type semiconductor layer and a p-type semiconductor layer, respectively, and may be made of a nitride semiconductor. Thus, in the present exemplary embodiment, the first and second conductivity-types may be understood to indicate n-type and p-type conductivities, respectively, but one or more other exemplary embodiments are not limited thereto. 
     The active layer  22  is a layer for emitting light according to electron-hole recombination. The active layer  22  may have a multi-quantum well (MQW) structure formed by alternatively disposing InGaN layers as quantum well layers and (Al)GaN layers as quantum barrier layers. A blue LED may use an MQW structure including InGaN/GaN, or the like, and an ultraviolet (UV) LED may use an MQW structure including GaN/AlGaN, InAlGaN/InAlGaN, InGaN/AlGaN, or the like. In order to enhance efficiency of the active layer  22 , a wavelength of light is adjusted by changing a composition ratio of indium (In) or aluminum (Al), or internal quantum efficiency is enhanced by changing the depth of the quantum well layer in the active layer  22 , the number of active layers, the thickness of the active layer, or the like. 
     Like the first conductivity-type semiconductor layer  21 , the second conductivity-type semiconductor layer  23  may also be made of a semiconductor material doped with a p-type impurity having an empirical formula Al x In y Ga (1-x-y) N (here, 0≦x≦1, 0≦y≦1, 0≦x+y≦1), and such materials may include GaN, AlGaN, and InGaN. Impurities used for doping the second conductivity-type semiconductor layer  23  may include magnesium (Mg), zinc (Zn), beryllium (Be), and the like. 
     Next, as illustrated in  FIG. 2 , a mask (M) is placed on the second conductivity-type semiconductor layer  23  and an etching process is performed thereon to remove portions other than the portion on which the mask (M) is placed. Accordingly, a plurality of light emitting laminates  20  (i.e., a plurality of light emitting lamination bodies) in which the first conductivity-type semiconductor layer  21 , the active layer  22 , and the second conductivity-type semiconductor layer  23  are sequentially laminated are formed on the growth substrate  10 . 
     The plurality of light emitting laminates  20  may be spaced apart from one another and arranged in row and column directions. In the drawing, it is illustrated that two light emitting laminates  20  are provided, although it is understood that one or more other exemplary embodiments are not limited thereto and the number of light emitting laminates  20  may vary. 
     An adhesive  24  may be provided on the light emitting laminates  20 . The light emitting laminates  20  may be joined to a substrate  30  of a package body by the adhesive  24  at a later time. 
     Then, as illustrated in  FIG. 4A , the substrate  30  on which a plurality of terminal units  40  including a pair of first and second electrode terminals  41  and  42  are formed is provided. The substrate  30  may correspond to a package body in a general light emitting device package. 
     The substrate  30  may be made of a ceramic material such as MN, Al 2 O 3 , or the like, and the terminal units  40  may be formed (i.e., provided) on upper and lower surfaces of the substrate  30  and electrically connected through a conductive via  43  penetrating the substrate  30 . In detail, the electrode terminals  41  and  42  formed on the upper surface of the substrate  30  may be electrically connected to the light emitting laminate  20 , and the electrode terminals  41  and  42  formed on the lower surface of the substrate  30  may be electrically connected to a circuit board such as an illumination device on which a light emitting device is to be mounted afterwards. 
     In the present exemplary embodiment, the substrate  30  is made of a ceramic material and includes the terminal units  40  on upper and lower surfaces thereof and a conductive via  43  penetrating the substrate  30 , although it is understood that one or more other exemplary embodiments are not limited thereto. The substrate  30  may be a printed circuit board (PCB), may be made of an organic resin material containing epoxy, triazine, silicon, polyimide, or the like, and any other organic resin materials, or a metal and a metal compound, and may include a metal PCB, a metal-core printed circuit board (MCPCB), or the like. 
     Meanwhile, as illustrated in  FIG. 4B , the substrate  30  according to another exemplary embodiment may further include a recess  31  accommodating the light emitting laminate  20 . A plurality of recesses  31  corresponding to the number of light emitting laminates  20  may be formed (i.e., provided) and are arranged to correspond to respective positions of the light emitting laminates  20 . The recess  31  may be formed to have a size larger than a sectional area of the light emitting laminate  20  and may be formed upon a depression in the upper surface of the substrate  30  being made, such that the recess  31  has a depth less than the thickness (or height) of the light emitting laminate  20 . 
     When the recess  31  is formed on the substrate  30 , at least a portion of a pair of electrode terminals of the terminal unit  40  may be formed within the recess  31 . For example, the first electrode terminal  41  may be formed on the upper surface of the substrate  30  and within the recess  31 , while the second electrode terminal  42  may be formed to be separated from the first electrode terminal  41  on the substrate  30 . 
     Then, as illustrated in  FIG. 5A , the growth substrate  10  is reversed to be placed on the substrate  30  such that the respective light emitting laminates  20  face corresponding respective terminals  40 , and the second conductivity-type semiconductor layer  23  of each of the light emitting laminates  20  is joined and electrically connected to any one of electrode terminals  41  of the corresponding terminal unit  40 . For example, the plurality of the light emitting laminates  20  may be joined to the first electrode terminals  41  of the respective terminal units  40 . 
     The light emitting laminate  20  may be joined and electrically connected to the first electrode terminal  41  through an electroconductive adhesive  24  provided on the second conductivity-type semiconductor layer  23 . The conductive adhesive  24  may be made of an electrically conductive material. The light emitting laminate  20  and the electrode terminal  41  may be bonded through eutectic bonding, paste bonding, or the like. 
     Meanwhile, as illustrated in  FIG. 5B , when the recesses  31  are formed on the substrate  30 , the growth substrate  10  is reversed and mounted on the substrate  30  such that the respective light emitting laminates  20  are insertedly accommodated in the recesses  31 , and the second conductivity-type semiconductor layers  23  of the respective light emitting laminates  20  are joined and electrically connected to the first electrode terminals  41  of the terminal unit  40  formed within the recess  31  by the electroconductive adhesives  24 . 
     In this manner, when the light emitting laminate  20  is insertedly accommodated in the recess  31  of the substrate  30 , the lateral surface of the light emitting laminate  20  is not in contact with an inner surface of the recess  31 . Namely, a bottom surface corresponding to a location of the adhesive  24  (based on the drawing) of the light emitting laminate  20  is in contact with a bottom surface of the recess  31  through the adhesive  24 , while the lateral surface, i.e., the surface perpendicular to the bottom surface, of the light emitting laminate  20  is not in contact with the recess  31 . Thus, a problem in which the first conductivity-type semiconductor layer  21  is in contact with the first electrode terminal  41  formed on the inner surface of the recess  31  to thereby cause an electrical short, or the like, can be prevented. 
     Thereafter, as illustrated in  FIGS. 6A and 6B , the growth substrate  10  is removed such that the first conductivity-type semiconductor layers  21  of the plurality of light emitting laminates  20  are exposed. The growth substrate  10  may be removed through a laser lift-off process of irradiating a laser onto an interface thereof with the light emitting laminates  20 . Alternatively, the growth substrate  10  may also be removed through a chemical process such as etching, or the like, or physically removed through grinding. However, the method of removing the growth substrate  10  is not limited to the foregoing methods and the growth substrate  10  may be removed according to various other methods. 
     Thereafter, as illustrated in  FIGS. 7A and 7B , a process for enhancing light extraction efficiency, such as a surface modification, or the like, may be performed on a surface  21   a  of the first conductivity-type semiconductor layer  21  exposed after the removal of the growth substrate  10 . 
     Also, as illustrated in  FIGS. 8A and 8B , a process of forming (i.e., providing) a current spreading layer  44  may be performed to spread a current on the first conductivity-type semiconductor layer  21  exposed after the removal of the growth substrate  10 . The current spreading layer  44  may be directly formed on the first conductivity-type semiconductor layer  21  or may be formed after the surface  21   a  is modified as illustrated in the drawing. The current spreading layer  44  may be made of a transparent conductive material, or may be made of an opaque conductive material according to circumstances. The current spreading layer  44  may be formed on the entire surface of the first conductivity-type semiconductor layer  21  or only on a portion of the first conductivity-type semiconductor layer  21 . 
     The surface modifying process and the current spreading layer forming process may be selectively performed. In the present exemplary embodiment, the surface  21   a  of the first conductivity-type semiconductor layer  21  exposed after the removal of the growth substrate  10  is modified, and then, the current spreading layer  44  is formed on the entire modified surface  21   a . However, it is understood that one or more other exemplary embodiments are not limited thereto and either of the surface modifying process or the current spreading layer forming process may be omitted or both may be omitted. 
     Then, as illustrated in  FIG. 9A , an insulating layer  50  is formed on the lateral surface of the plurality of light emitting laminates  20 . The insulating layer  50  may protect the lateral surfaces exposed from the light emitting laminate  20  and prevent a problem in which the first conductivity-type semiconductor layer  21  and the second conductivity-type semiconductor layer  23  are electrically connected to cause a short. Also, the insulating layer  50  may electrically insulate the first electrode terminal  41  and the second electrode terminal  42  provided on the substrate  30 . 
     Meanwhile, as illustrated in  FIG. 9B , when the recess  31  is formed on the substrate  30 , the insulating layer  50  fills a gap between the light emitting laminate  20  and the first electrode terminal  41  formed within the recess  31  and, at the same time, insulates the first conductivity-type semiconductor layer  21  and the second conductivity-type semiconductor layer  23  exposed from the sides, from the first electrode terminal  41 . Also, the insulating layer  50  may electrically insulate the first electrode terminal  41  and the second electrode terminal  42  provided on the substrate  30 . 
     Then, as illustrated in  FIGS. 10A and 10B , the exposed first conductivity-type semiconductor layer  21  is electrically connected to a different electrode terminal, i.e., the second electrode terminal  42 , of the corresponding terminal unit  40 . In detail, a circuit wiring layer  60  is patterned to be formed on the insulating layer  50  insulating the first electrode terminal  41  and the second electrode terminal  42  on the substrate  30  to electrically connect the first conductivity-type semiconductor layer  21  to the second electrode terminal  42 . 
     Thus, the second conductivity-type semiconductor layer  23  of the light emitting laminate  20  is electrically connected to the first electrode terminal  41  and the first conductivity-type semiconductor layer  21  thereof is electrically connected to the second electrode terminal  42 , thus making an electrical conduction. 
     Meanwhile, as illustrated in  FIGS. 11A and 11B , a wavelength conversion layer  70  may be formed on the substrate  30  to cover the light emitting laminate  20 . The wavelength conversion layer  70  may convert a wavelength of light output from the light emitting laminate  20  into a wavelength of light having a desired color. For example, the wavelength conversion layer  70  is able to convert monochromatic light such as red light or blue light into white light. A resin used to form the wavelength conversion layer  70  may contain one or more types of phosphor materials. Also, the resin of the wavelength conversion layer  70  may contain a UV ray absorbent absorbing UV light generated from the light emitting laminate  20 . 
     As an example, the wavelength conversion layer  70  may be made of a resin having a high level of transparency allowing light generated from the light emitting laminate  20  to pass therethrough with a minimal amount of loss. For example, the wavelength conversion layer  70  may be made of an elastic resin. Such an elastic resin is a gel-type resin such as silicon, or the like, which is rarely changed by light having a short wavelength, resulting in yellowing and a high refractive index, having excellent optical characteristics. 
     Then, as illustrated in  FIGS. 12A and 12B , a molded unit  80  may be formed to cover the light emitting laminate  20  on the substrate  30 . The molded unit  80  covers the light emitting laminate  20 , the wavelength conversion layer  70 , and the terminal unit  40  provided on the substrate  30  to protect the light emitting laminate  20 , the wavelength conversion layer  70 , and the terminal unit  40  from the outer environment. The molded unit  80  may be formed to have a lens shape protruded upwardly on each of the light emitting laminates  20 . Accordingly, light extraction efficiency of light output from the respective light emitting laminates  20  can be increased and an angle of beam spreading can be adjusted. 
     Thereafter, as illustrated in  FIGS. 13A and 13B , the plurality of light emitting laminates  20  are severed to be separated, thus fabricating the light emitting device  1 . 
       FIGS. 14A and 14B  are views schematically showing the light emitting device  1  fabricated through the foregoing method. Since the plurality of light emitting laminates  20  are severed in a state of being arranged on the substrate  30 , the severed sections of the substrate  30  and the molded unit  80  exposed from the lateral surfaces of each light emitting device  1  may be coplanar. 
     As illustrated, the light emitting laminate  20  may be directly mounted on the substrate  30  without a support substrate supporting the light emitting laminate  20 . Thus, since the light emitting laminate  20  is directly mounted on the upper surface of the substrate  30 , omitting a support substrate to be mounted on the substrate  30 , the number of components is reduced, and the light emitting device  1  is reduced in thickness, obtaining an effect in which the size of the product is reduced. Furthermore, when the recess  31  is formed in the substrate  30  as illustrated in  FIG. 14B , since the light emitting laminate  20  is accommodated in the recess  31 , the height of the light emitting device  1  is further lowered, maximizing the reduction level of the light emitting device  1 . 
     In addition, rather than employing a scheme in which the light emitting laminate  20  is diced on the growth substrate  10  and then individually mounted, the plurality of light emitting laminates  20  are collectively bonded to the substrate  30  on a wafer level, so the process can be simplified and mass-production can be facilitated, thereby enhancing productivity. 
       FIGS. 15A and 15B  are views schematically showing a modification of a light emitting device  1  fabricated according to an exemplary embodiment. As illustrated in  FIG. 15A , the first conductivity-type semiconductor layer  21  and the second electrode terminal  42  may be electrically connected through a metal stud bump  60 ′. Also, as illustrated in  FIG. 15B , the first conductivity-type semiconductor layer  21  and the second electrode terminal  42  may be electrically connected through wire  60 ″ bonding. 
       FIG. 16  is a view schematically showing another modification of a light emitting device  1  fabricated according to an exemplary embodiment. As illustrated in  FIG. 16 , a portion of the conductive via  43  connected to the electrode terminal  41  to which the light emitting laminate  20  is joined may be positioned under the light emitting laminate  20 . Thus, heat generated from the light emitting laminate  20  may be quickly transmitted downwardly through the conductive via  43  so as to be dissipated to the outside, obtaining an effect of enhancing heat dissipation efficiency. 
     A method of fabricating a light emitting device  1  according to another exemplary embodiment will be described with reference to  FIGS. 17 through 20 .  FIGS. 17 through 20  are views schematically illustrating respective steps of a method of fabricating a light emitting device  1  according to another exemplary embodiment. 
     As illustrated in  FIG. 17 , a plurality of light emitting laminates  20  on which the first conductivity-type semiconductor layer  21 , the active layer  22 , and the second conductivity-type semiconductor layer  23  are sequentially laminated are formed on the growth substrate  10 . A specific process of forming the light emitting laminate  20  is substantially the same as or similar to the process described above with reference to  FIGS. 1 through 3 , so a description thereof will be omitted herein. 
     Next, as illustrated in  FIG. 18 , portions of the second conductivity-type semiconductor layer  23  and the active layer  22  of each of the light emitting laminates  20  are removed to expose a portion of the first conductivity-type semiconductor layer  21 . Here, the portions of the second conductivity-type semiconductor layer  23  and the active layer  22  may be removed through mesa etching, and the first conductivity-type semiconductor layer  21  may be exposed from the removed region. 
     Then, as shown in  FIG. 19 , a substrate  30  on which a plurality of terminal units  40  including a pair of first electrode  41  and second electrode  42  are provided is prepared. The substrate  30  may further include the recess  31  for accommodating the light emitting laminate  20 . In the present exemplary embodiment, the substrate  30  includes the recess  31 , although it is understood that one or more other exemplary embodiments are not limited thereto. Namely, the substrate  30  may not have the recess  31 , as shown in  FIG. 4A . Hereinafter, the structure in which the substrate  30  includes the recess  31  will be described. 
     Portions of the pair of electrode terminals  41  and  42  of the terminal unit  40  may be formed within the recess  31 . In detail, the first electrode terminal  41  and the second electrode terminal  42  may be formed on the upper surface of the substrate  30  and within the recess  31  and opposite to each other on a bottom surface of the recess  31 . 
     Thereafter, as shown in  FIG. 20 , the growth substrate  10  is reversed to be disposed above the substrate  30  such that the respective light emitting laminates  20  face the respective terminal units  40  on the substrate  30 . Accordingly, the growth substrate  10  is placed on the substrate  30  such that the respective light emitting laminates  20  are insertedly accommodated within the recesses  31 . 
     Then, the second conductivity-type semiconductor layer  23  and the first conductivity-type semiconductor layer  21  of the respective light emitting laminates  20  are joined and electrically connected to the first electrode terminal  41  and the second electrode terminal  42 , respectively, of the corresponding terminal units  40  formed within the recesses  31 . For example, the second conductivity-type semiconductor layer  23  is joined to the first electrode terminal  41  formed on a bottom surface of the recess  31 , and the first conductivity-type semiconductor layer  21  is joined to the second electrode terminal  42  formed on the bottom surface of the recess  31 . 
     The light emitting laminate  20  may be joined and electrically connected to the first electrode terminal  41  and the second electrode terminal  42  by the electroconductive adhesive  24  provided on the second conductivity-type semiconductor layer  23  and the exposed first conductivity-type semiconductor layer  21 . The conductive adhesive  24  may be made of an electrically conductive material. The light emitting laminate  20  and the electrode terminals  41  and  42  may be bonded through eutectic bonding, paste bonding, or the like. 
     Thereafter, as illustrated in  FIGS. 6A-6B ,  7 A- 7 B,  8 A- 8 B,  11 A- 11 B,  12 A- 12 B, and  13 A- 13 B, the process of removing the growth substrate  10  to expose the first conductivity-type semiconductor layer  21 , the process of modifying the surface of the exposed first conductivity-type semiconductor layer  21  or forming the current spreading layer  44 , the process of forming the wavelength conversion layer  70  on the substrate  30  to cover the light emitting laminate  20 , the process of forming the molded unit  80  on the substrate  30  to cover the light emitting laminate  20 , and the process of cutting to separate the plurality of light emitting laminates  20 , and the like, may be performed. 
       FIG. 21  is a view schematically showing a light emitting device  1  fabricated through a method of fabricating a light emitting device according to the foregoing exemplary embodiment. The light emitting device  1  has a structure in which the light emitting laminate  20  is electrically connected to the respective electrode terminals  41  and  42  through a lower surface, so light emitted upwardly is not affected, further enhancing light extraction efficiency. Namely, in the light emitting device  1  illustrated in  FIG. 21 , there is no influence (e.g., obstruction) on emitted light by an electrical connection between the electrode terminals  41  and  42  and the light emitting laminate  20 . 
     As set forth above, according to exemplary embodiments, the support substrate supporting a grown semiconductor layer may be omitted in mounting the LED chip on a package substrate, so the number of components can be reduced and the fabrication process can be simplified. 
     While exemplary embodiments have been shown and described above, it will be apparent to those skilled in the art that modifications and variations can be made without departing from the spirit and scope of the inventive concept as defined by the appended claims.