Abstract:
A manufacturing method of a light emitting diode (LED) apparatus includes the steps of: forming at least one temporary substrate, which is made by a curable material, on a LED device; and forming at least a thermal-conductive substrate on the LED device. The manufacturing method does not need the step of adhering the semiconductor structure onto another substrate by using an adhering layer, and can make the devices to be in sequence separated after removing the temporary substrate, thereby obtaining several LED apparatuses. As a result, the problem of current leakage due to the cutting procedure can be prevented so as to reduce the production cost and increase the production yield.

Description:
CROSS REFERENCE TO RELATED APPLICATIONS 
     This Non-provisional application claims priority under 35 U.S.C. §119(a) on Patent Application No(s). 096125036 filed in Taiwan, Republic of China on Jul. 10, 2007, the entire contents of which are hereby incorporated by reference. 
     BACKGROUND OF THE INVENTION 
     1. Field of Invention 
     The invention relates to a manufacturing method of a light-emitting diode (LED) apparatus. 
     2. Related Art 
     A light-emitting diode (LED) apparatus is a light-emitting device made of semiconductor material. It pertains to a cold light emitting element and has the advantages of low power consumption, long lifetime and fast response speed. In addition, the LED apparatus has small size so that it can be used to manufacture fine device or array-type device. Therefore, the applications of the LED apparatus can be spread into the indicator of a computer or a house appliance product, the backlight source of a LCD device, and the light of traffic sign or vehicle. 
     To increase the lighting efficiency of the LED apparatus, a metal reflective substrate is added to a LED device for reflecting light, thereby increasing the lighting efficiency. However, this architecture of the LED apparatus still has some problems to be solved. 
       FIG. 1  shows a LED apparatus disclosed in a Taiwan Patent number 544,958. The LED apparatus includes a metal reflective substrate  801  and a multilayer disposed on the metal reflective substrate  801 . The multilayer includes a first reaction layer  802 , a transparent adhering layer  803 , a second reaction layer  804 , a transparent conductive layer  805 , a first contact layer  806 , a p-type epitaxial layer  807 , a light-emitting layer  808 , an n-type epitaxial layer  809  and a second contact layer  810  in sequence. In addition, electrodes  811  and  812  are respectively formed on the second contact layer  810  and the transparent conductive layer  805 . 
     The transparent adhering layer  803  attaches the first reaction layer  802  and the second reaction layer  804  and also connects the metal reflective substrate  801  to the first reaction layer  802 . However, since the transparent adhering layer  803  is made of a plastic material, the heat generated by the LED apparatus cannot be transferred to the metal reflective substrate  801  and then be dissipated. Thus, the heat is accumulated inside the LED apparatus, resulting in the decrease of the efficiency. 
     Moreover, during the manufacturing processes, the metal reflective substrate  801  and the multilayer are cut to obtain a plurality of LED apparatuses. However, metal particles may be attached to the side surface of the multilayer in the cutting process, which will increase the current leakage from the multilayer. 
       FIG. 2  shows a LED apparatus disclosed in a Taiwan Patent number 543,210. A metal bonding layer  901  is provided to connect a LED multilayer  902  and a metal reflective substrate  903 . In this case, a high-temperature high-pressure process is needed to connect the metal bonding layer  901  and the metal reflective substrate  903 . However, this method will lead to diffusion between the LED multilayer  902  and the metal reflective substrate  903 . In addition, regarding to the LED apparatus, the dicing process may also increase the current leakage of the LED multilayer  902 . 
     The above-mentioned conventional LED apparatuses both form the epitaxial multilayer on an epitaxial substrate, and then transfer it onto a glass substrate or a plating substrate. Furthermore, a dicing process is necessary to obtain the desired LED apparatuses. Thus, the conventional manufacturing methods not only need the additional dicing process, but also increase the possibility of attaching the metal particles on the side wall of the multilayer. 
     Therefore, it is an important subject to provide a manufacturing method of a LED apparatus for solving the above problems and thus increasing the performance thereof. 
     SUMMARY OF THE INVENTION 
     In view of the foregoing, the invention is to provide a manufacturing method of a LED apparatus that can fabricate the LED apparatus without the dicing process, thereby reducing the production cost and decreasing the current leakage. 
     To achieve the above, the invention discloses a manufacturing method of a LED apparatus including the following steps of: forming at least one temporary substrate on a LED device, and forming at least one thermal-conductive substrate on the LED device. 
     In the invention, the temporary substrate can be a curable material. In addition, after removing the epitaxial substrate by laser lift-off, etching, polishing or laser ablation, the temporary substrate is removed so as to obtain the LED apparatus. Thus, the dicing process is unnecessary, so that the possibility of attaching the metal particles onto the side wall of the epitaxial multilayer can be decreased. 
     As mentioned above, the manufacturing method of a LED apparatus according to the invention is to form a temporary substrate on the LED device and form at least one thermal-conductive substrate on the LED device. Since the temporary substrate is made of the curable material, which has the properties of removable, expansible and extendible, it can be easily removed. Compared with the prior art, the invention can obtain a plurality of LED apparatuses by simply removing the temporary substrate. Therefore, the current leakage caused by the dicing process can be prevented, thereby decreasing the production cost and increasing the production yield. 
    
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
       The invention will become more fully understood from the detailed description and accompanying drawings, which are given for illustration only, and thus are not limitative of the present invention, and wherein: 
         FIG. 1  is a schematic view of a conventional LED apparatus; 
         FIG. 2  is a schematic view of another conventional LED apparatus; 
         FIG. 3  is a flow chart of a manufacturing method of a plurality of LED apparatuses according to a first embodiment of the invention; 
         FIGS. 4A to 4H  are schematic illustrations showing the LED apparatuses manufactured by the manufacturing method according to the first embodiment of the invention; 
         FIG. 5  is a flow chart of a manufacturing method of a plurality of LED apparatuses according to a second embodiment of the invention; 
         FIGS. 6A to 6G  are schematic illustrations showing the LED apparatuses manufactured by the manufacturing method according to the second embodiment of the invention; 
         FIG. 7  is a flow chart of a manufacturing method of a plurality of LED apparatuses according to a third embodiment of the invention; 
         FIGS. 8A to 8J  are schematic illustrations showing the LED apparatuses manufactured by the manufacturing method according to the third embodiment of the invention; 
         FIG. 9  is a flow chart of a manufacturing method of a plurality of LED apparatuses according to a fourth embodiment of the invention; 
         FIGS. 10A to 10K  are schematic illustrations showing the LED apparatuses manufactured by the manufacturing method according to the fourth embodiment of the invention; 
         FIG. 11  is a flow chart of a manufacturing method of a plurality of LED apparatuses according to a fifth embodiment of the invention; 
         FIGS. 12A to 12J  are schematic illustrations showing the LED apparatuses manufactured by the manufacturing method according to the fifth embodiment of the invention; 
         FIG. 13  is a flow chart of a manufacturing method of a plurality of LED apparatuses according to a sixth embodiment of the invention; 
         FIGS. 14A to 14G  are schematic illustrations showing the LED apparatuses manufactured by the manufacturing method according to the sixth embodiment of the invention; 
         FIG. 15  is a flow chart of a manufacturing method of a plurality of LED apparatuses according to a seventh embodiment of the invention; 
         FIGS. 16A to 16I  are schematic illustrations showing the LED apparatuses manufactured by the manufacturing method according to the seventh embodiment of the invention; 
         FIG. 17  is a flow chart of a manufacturing method of a plurality of LED apparatuses according to an eighth embodiment of the invention; and 
         FIGS. 18A to 18I  are schematic illustrations showing the LED apparatuses manufactured by the manufacturing method according to the eighth embodiment of the invention. 
     
    
    
     DETAILED DESCRIPTION OF THE INVENTION 
     The present invention will be apparent from the following detailed description, which proceeds with reference to the accompanying drawings, wherein the same references relate to the same elements. 
     First Embodiment 
     With reference to  FIG. 3 , a manufacturing method of a plurality of LED apparatuses  4  according to a first embodiment of the invention includes the following steps S 101  to S 108 . The detailed illustrations of the manufacturing method will be described herein below with reference to  FIGS. 4A to 4H . 
     As shown in  FIG. 4A , in step S 101 , an epitaxial multilayer E, a seed layer  101  and a patterned photoresist layer  102  are in sequence formed on an epitaxial substrate  103 , thereby forming a LED device  10 . The epitaxial multilayer E includes a first semiconductor layer  104 , a light emitting layer  105  and a second semiconductor layer  106 . The first semiconductor layer  104  is formed on the epitaxial substrate  103 , the light emitting layer  105  is formed on the first semiconductor layer  104 , and then the second semiconductor layer  106  is formed on the light emitting layer  105 . The seed layer  101  is formed on the second semiconductor layer  106 , and the patterned photoresist layer  102  is formed on the seed layer  101 . The patterned photoresist layer  102  has a plurality of limiting areas LA. 
     In this embodiment, the first semiconductor layer  104  and the second semiconductor layer  106  are, respectively, an N-type epitaxial layer and a P-type epitaxial layer. Of course, the first semiconductor layer  104  and the second semiconductor layer  106  can be, respectively, a P-type epitaxial layer and an N-type epitaxial layer. The seed layer  101  includes a reflective layer, an ohmic contact layer and/or a transparent conductive layer. A material of the reflective layer includes a dielectric material or metal, such as titanium (Ti), aluminum (Al), chromium (Cr), nickel (Ni), platinum (Pt), gold (Au), silver (Ag), chromium/gold (Cr/Au), nickel/gold (Ni/Au), palladium (Pd), titanium/gold (Ti/Au), titanium/silver (Ti/Ag), chromium/platinum/gold (Cr/Pt/Au), an alloy thereof, a multi-metal layer thereof or a combination thereof, wherein chromium/gold (Cr/Au), nickel/gold (Ni/Au), titanium/gold (Ti/Au), titanium/silver (Ti/Ag) or chromium/platinum/gold (Cr/Pt/Au) is an alloy or a multi-metal layer. Take A/B for example. When A/B is a two-metal layer, A is a first metal layer, and B is a second metal layer. When A/B/C is a three metal layer, A is a first metal layer and B is a second metal layer and C is a third metal layer. This concept is applied to all other embodiments of the present invention, and will not be described anymore. A material of the ohmic contact layer comprises nickel/gold (Ni/Au), indium tin oxide (ITO), titanium nitride (TiN), cadimium tin oxide (CTO), nickel oxide (NiO), indium zinc oxide (IZO) or aluminum doped zinc oxide (AZO). 
     As shown in  FIG. 4B , in step S  102 , at least one thermal-conductive substrate  107  is formed on the LED device  10  of  FIG. 4A . The thermal-conductive substrate  107  can be formed on the seed layer  101  by electrochemical deposition, electroforming or electroplating. The position of the thermal-conductive substrate  107  is defined by the limiting areas LA of the patterned photoresist layer  102 . A material of the thermal-conductive substrate  107  includes a thermal-conductive metal, such as nickel. (Ni), copper (Cu), cobalt (Co), gold (Au) or aluminum (Al). To be noted, the thermal-conductive substrate  107  can be composed of a single material or be composed of multiple thermal-conductive metals and include a plurality of layers, such as three layers of Cu—Ni—Cu or Ni—Cu—Ni. The above examples are for illustrations only without limiting the scope of the invention, and any design capable of achieving good thermal conducting effect can be applied in this embodiment. 
     As shown in  FIG. 4C , in step S 103 , the seed layer  101 , the epitaxial multilayer E and the epitaxial substrate  103  between two of the thermal-conductive substrates are etched away, so that each of the seed layer  101 , the epitaxial multilayer E and the epitaxial substrate  103  forms a plurality of side surfaces. In the step S 103 , the side surfaces can be formed by a photo process, photolithography process and an etching process, which may include the steps of forming, exposing, developing, etching and removing the photoresist. Herein, the etching step can be performed by a dry etching process or a wet etching process. 
     As shown in  FIG. 4D , in step S 104 , a protective layer  108  is formed on the side surfaces of the epitaxial multilayer E or the side surfaces and the epitaxial substrate  103 . A material of the protective layer  108  includes an insulating dielectric material such as an oxide, a nitride or a silicon carbide. 
     As shown in  FIG. 4E , in step S 105 , at least one temporary substrate  109  is formed on the LED device. In the embodiment, the temporary substrate  109  covers the thermal-conductive substrate  107 , and the protective layer  108  is disposed between the temporary substrate  109  and the epitaxial substrate  103 . Herein, the LED device includes the epitaxial multilayer E and the epitaxial substrate  103  as shown in  FIG. 4A . 
     A material of the temporary substrate  109  includes a curable material, such as photoresist, fluoro carbon rubber, fluoroelastomer, UV gel or instant adhesive. In this case, the step of forming the temporary substrate  109  includes the sub-steps of forming a curable material, and curing the curable material. The curable material can be formed by spin coating, screen printing, mesh printing or glue dispensing, and the curable material is cured by photo curing, thermal curing or cool curing. Alternatively, the curable material can be used as an adhesive layer for connecting the temporary substrate  109  and the thermal-conductive substrate  107 , thereby forming a temporary substrate  109 . That is, a temporary substrate is provided, and a curable material is formed between the temporary substrate and the LED device as an adhesive layer, and then the curable material is cured. 
     As shown in  FIG. 4F , after forming the temporary substrate  109 , the epitaxial substrate  103  is removed in step S 106 . In the embodiment, the epitaxial substrate  103  can be removed by laser lift-off, laser ablation, polishing or etching. In step S 107 , as shown in  FIG. 4C , a plurality of electrodes  110  are formed at a side of the epitaxial multilayer E opposite to the temporary substrate  109 . As shown in  FIG. 4H , in step S 108 , the temporary substrate  109  is removed so as to form a plurality of vertical LED apparatuses  4 . 
     Since the curable material has the properties of removable, expansible and extensible, the temporary substrate  109  can be removed easily by heating, water heating, UV light, chemical solution or organic solution. While the temporary substrate  109  is removed, the protective layer  108  disposed between two LED apparatuses is simultaneously removed. Accordingly, the LED devices are separated to form a plurality of LED apparatuses  4 . Thus, the conventional dicing process is unnecessary, so that the problem of current leakage caused by the dicing process can be avoided. Moreover, the epitaxial multilayer E disposed aside the protective layer  108  can insulate electricity and thus prevent the current leakage. 
     It is to be specified that the above-mentioned steps are unnecessary to be performed in the order of the embodiment, and they can be switched depending on the actual needs of processing. 
     Second Embodiment 
     With reference to  FIG. 5 , a manufacturing method of a plurality of LED apparatuses  6  according to a second embodiment of the invention includes the following steps S 201  to S 208 . The detailed illustrations of the manufacturing method will be described herein below with reference to  FIGS. 6A to 6G . 
     As shown in  FIG. 6A , in step S 201 , an epitaxial multilayer E, a seed layer  201  and a patterned photoresist layer  202  are in sequence formed on an epitaxial substrate  203 , thereby forming a LED device  20 . The epitaxial multilayer E includes a first semiconductor layer  204 , a light emitting layer  205  and a second semiconductor layer  206 . The first semiconductor layer  204  is formed on the epitaxial substrate  203 , the light emitting layer  205  is formed on the first semiconductor layer  204 , and then the second semiconductor layer  206  is formed on the light emitting layer  205 . The seed layer  201  is formed on the second semiconductor layer  206 , and the patterned photoresist layer  202  is formed on the seed layer  201 . The patterned photoresist layer  202  has a plurality of limiting areas LA. The epitaxial multilayer E, seed layer  201  and patterned photoresist layer  202  of the second embodiment are the same as the epitaxial multilayer E, seed layer  101  and patterned photoresist layer  102  of the first embodiment, so the detailed descriptions are omitted. 
     As shown in  FIG. 6B , in step S 202 , at least one thermal-conductive substrate  207  is formed on the LED device  20 . The thermal-conductive substrate  207  can be formed on the seed layer  201  by electrochemical deposition, non-electroplating, electroforming or electroplating. The position of the thermal-conductive substrate  207  is defined by the limiting areas LA of the patterned photoresist layer  202 . A material of the thermal-conductive substrate  207  includes a thermal-conductive metal, such as nickel (Ni), copper (Cu), cobalt (Co), gold (Au) or aluminum (Al). To be noted, the thermal-conductive substrate  207  can be composed of a single material or be composed of multiple thermal-conductive metals and include a plurality of layers, such as three layers of Cu—Ni—Cu or Ni—Cu—Ni. The above examples are for illustrations only without limiting the scope of the invention, and any design capable of achieving good thermal conducting effect can be applied in this embodiment. 
     As shown in  FIG. 6C , in step S 203 , at least one temporary substrate  209  is formed on the LED device. In the embodiment, the temporary substrate  209  covers the thermal-conductive substrates  207 . The material and forming method of the temporary substrate  209  are the same as those of the temporary substrate  109  of the first embodiment, so the detailed descriptions are omitted. Alternatively, a temporary substrate is provided, and a curable material is formed between the temporary substrate and the LED device as an adhesive layer, and then the curable material is cured. 
     As shown in  FIG. 6D , after forming the temporary substrate  209 , the epitaxial substrate  203  is removed in step S 204 . In the embodiment, the epitaxial substrate  203  can be removed by laser lift-off, laser ablation, polishing or etching. In step S 205 , as shown in  FIG. 6E , a plurality of electrodes  210  are formed at a side of the epitaxial multilayer E opposite to the temporary substrate  209 . As shown in FIG.  6 F, in step S 206 , the seed layer  201  and the epitaxial multilayer E between two of the thermal-conductive substrates  207  are etched, so that each of the seed layer  201  and the epitaxial multilayer E forms a plurality of side surfaces. After the etching step, a protective layer  208  is formed on the side surfaces in step S 207 . The etching step and the material of the protective layer  208  are the same as those of the first embodiment, so the detailed descriptions are omitted. 
     As shown in  FIG. 6G , in step S 208 , the temporary substrate  209  is removed so as to form a plurality of vertical LED apparatuses  6 . Since the curable material has the properties of removable, expansible and extensible, the temporary substrate  209  can be removed easily by heating, water heating, UV light, chemical solution or organic solution. 
     It is to be specified that the above-mentioned steps are unnecessary to be performed in the order of the embodiment, and they can be switched depending on the actual needs of processing. 
     Third Embodiment 
     With reference to  FIG. 7 , a manufacturing method of a plurality of LED apparatuses  8  according to a third embodiment of the invention includes the following steps S 301  to S 310 . The detailed illustrations of the manufacturing method will be described herein below with reference to  FIGS. 8A to 8J . 
     As shown in  FIG. 8A , in step S 301 , an epitaxial multilayer E is formed on an epitaxial substrate  303 . The epitaxial multilayer E includes a first semiconductor layer  304 , a light emitting layer  305  and a second semiconductor layer  306 . The first semiconductor layer  304  is formed on the epitaxial substrate  303 , the light emitting layer  305  is formed on the first semiconductor layer  304 , and then the second semiconductor layer  306  is formed on the light emitting layer  305 . 
     After the epitaxial multilayer E is formed, as shown in  FIG. 8B , the epitaxial multilayer E and the epitaxial substrate  303  are etched, so that each of the epitaxial multilayer E and the epitaxial substrate  303  forms a plurality of side surfaces in step S 302 . Alternatively, the epitaxial multilayer E is etched until to the epitaxial substrate  303 , so that the epitaxial multilayer E forms a plurality of side surfaces in step S 302 . In this embodiment, the etching process can be a dry etching process or a wet etching process. 
     As shown in  FIG. 8C , a protective layer  308  is formed on the side surfaces of the epitaxial multilayer E or the side surfaces and epitaxial substrate  303  in step S 303 . The material of the protective layer  308  is the same as that of the protective layer  108  of the first embodiment, so the detailed descriptions are omitted. 
     After forming the protective layer  308 , as shown in  FIG. 8D , a seed layer  301  is formed on the epitaxial multilayer E and the protective layer  308  in step S 304 . The material of the seed layer  301  is the same as that of the seed layer  101  of the first embodiment, so the detailed descriptions are omitted. 
     After forming the seed layer  301 , as shown in  FIG. 8E , a patterned photoresist layer  302  is formed on the seed layer  301  in step S 305 . The patterned photoresist layer  302  has a plurality of limiting areas LA for forming a plurality of LED devices  30 , respectively. 
     As shown in  FIG. 8F , in step S 306 , at least one thermal-conductive substrate  307  is formed on the LED device  30 . The thermal-conductive substrate  307  can be formed on the seed layer  301  by electrochemical deposition, non-electroplating, electroforming or electroplating. The position of the thermal-conductive substrate  307  is defined by the limiting areas LA of the patterned photoresist layer  302 . A material of the thermal-conductive substrate  307  includes a thermal-conductive metal, such as nickel (Ni), copper (Cu), cobalt (Co), gold (Au) or aluminum (Al). To be noted, the thermal-conductive substrate  307  can be composed of a single material or be composed of multiple thermal-conductive metals and include a plurality of layers, such as three layers of Cu—Ni—Cu or Ni—Cu—Ni. The above examples are for illustrations only without limiting the scope of the invention, and any design capable of achieving good thermal conducting effect can be applied in this embodiment. 
     As shown in  FIG. 8G , after forming the thermal-conductive substrate  307 , at least one temporary substrate  309  is formed on the LED device  30  in step S 307 . In the embodiment, the temporary substrate  309  covers the thermal-conductive substrate  307 . Alternatively, a temporary substrate is provided, and a curable material is formed between the temporary substrate and the LED device as an adhesive layer, and then the curable material is cured. The material and forming method of the temporary substrate  309  are the same as those of the temporary substrate  109  of the first embodiment, so the detailed descriptions are omitted. 
     As shown in  FIG. 8H , the epitaxial substrate  303  is removed in step S 308 . In the embodiment, the epitaxial substrate  303  can be removed by laser lift-off, laser ablation, polishing or etching. In step S 309 , as shown in  FIG. 81 , a plurality of electrodes  310  are formed at a side of the epitaxial multilayer E opposite to the temporary substrate  309  after the epitaxial substrate  303  is removed. As shown in  FIG. 8J , in step S 310 , the temporary substrate  309  is removed so as to form a plurality of vertical LED apparatuses  8 . 
     Since the curable material has the properties of removable, expansible and extensible, the temporary substrate  309  can be removed easily by heating, water heating, UV light, chemical solution or organic solution. While the temporary substrate  309  is removed, the protective layer  308  and the seed layer  301  disposed between two LED apparatuses  8  are simultaneously removed. Accordingly, the LED devices  30  are separated to form a plurality of LED apparatuses  8 . 
     It is to be specified that the above-mentioned steps are unnecessary to be performed in the order of the embodiment, and they can be switched depending on the actual needs of processing. 
     Fourth Embodiment 
     With reference to  FIG. 9 , a manufacturing method of a plurality of LED apparatuses according to a fourth embodiment of the invention includes the following steps S 401  to S 411 . The detailed illustrations of the manufacturing method will be described herein below with reference to  FIGS. 10A to 10K . 
     As shown in  FIG. 10A , in step S 401 , an epitaxial multilayer E is formed on an epitaxial substrate  403 . The epitaxial multilayer E includes a first semiconductor layer  404 , a light emitting layer  405  and a second semiconductor layer  406 . The first semiconductor layer  404  is formed on the epitaxial substrate  403 , the light emitting layer  405  is formed on the first semiconductor layer  404 , and then the second semiconductor layer  406  is formed on the light emitting layer  405 . 
     As shown in  FIG. 10B , the epitaxial multilayer E is etched in step S 402 , so that the epitaxial multilayer E forms a plurality of side surfaces. In this embodiment, the etching process can be a dry etching process or a wet etching process. As shown in  FIG. 10C , a protective layer  408  is formed on the side surfaces and the epitaxial multilayer E in step S 403 . The material of the protective layer  408  is the same as that of the protective layer  108  of the first embodiment, so the detailed descriptions are omitted. 
     After forming the protective layer  408 , as shown in  FIG. 10D , a seed layer  401  is formed on the epitaxial multilayer E and the protective layer  408  in step S 404 . The material of the seed layer  401  is the same as that of the seed layer  101  of the first embodiment, so the detailed descriptions are omitted. After forming the seed layer  401 , as shown in  FIG. 10E , a patterned photoresist layer  402  is formed on the seed layer  401  in step S 405 . The patterned photoresist layer  402  has a plurality of limiting areas LA for forming a plurality of LED devices  40 , respectively. 
     As shown in  FIG. 10F , in step S 406 , at least one thermal-conductive substrate  407  is formed on the LED device  40 . The thermal-conductive substrate  407  can be formed on the seed layer  401  by electrochemical deposition, non-electroplating, electroforming or electroplating. The position of the thermal-conductive substrate  407  is defined by the limiting areas LA of the patterned photoresist layer  402 . A material of the thermal-conductive substrate  407  includes a thermal-conductive metal, such as nickel (Ni), copper (Cu), cobalt (Co), gold (Au) or aluminum (Al). To be noted, the thermal-conductive substrate  407  can be composed of a single material or be composed of multiple thermal-conductive metals and include a plurality of layers, such as three layers of Cu—Ni—Cu or Ni—Cu—Ni. The above examples are for illustrations only without limiting the scope of the invention, and any design capable of achieving good thermal conducting effect can be applied in this embodiment. 
     As shown in  FIG. 10 , after forming the thermal-conductive substrate  407 , at least one temporary substrate  409  is formed on the LED device  40  in step S 407 . In the embodiment, the temporary substrate  409  covers the thermal-conductive substrate  407 . Alternatively, a temporary substrate is provided, and a curable material is formed between the temporary substrate and the LED device as an adhesive layer, and then the curable material is cured. The material and forming method of the temporary substrate  409  are the same as those of the temporary substrate  109  of the first embodiment, so the detailed descriptions are omitted. 
     As shown in  FIG. 10H , the epitaxial substrate  403  is removed in step S 408  so as to expose one side of the epitaxial multilayer E. In the embodiment, the epitaxial substrate  403  can be removed by laser lift-off, laser ablation, polishing or etching. In step S 409 , as shown in  FIG. 10I , a plurality of electrodes  410  are formed at the side of the epitaxial multilayer E after the epitaxial substrate  403  is removed. As shown in  FIG. 10J , in step S 410 , the seed layer  401 , the protective layer  408  and the epitaxial multilayer E between two of the thermal-conductive substrates  407  are etched from the exposed side. 
     As shown in  FIG. 10K , in step S 411 , the temporary substrate  409  is removed so as to form a plurality of vertical LED apparatuses  11 . Since the curable material has the properties of removable, expansible and extensible, the temporary substrate  409  can be removed easily by heating, water heating, UV light, chemical solution or organic solution. 
     It is to be specified that the above-mentioned steps are unnecessary to be performed in the order of the embodiment, and they can be switched depending on the actual needs of processing. 
     Fifth Embodiment 
     With reference to  FIG. 11 , a manufacturing method of a plurality of LED apparatuses  12  according to a fifth embodiment of the invention includes the following steps S 501  to S 511 . The detailed illustrations of the manufacturing method will be described herein below with reference to  FIGS. 12A to 12J . 
     As shown in  FIG. 12A , in step S 501 , an epitaxial multilayer E is formed on an epitaxial substrate  503 . The epitaxial multilayer E includes a first semiconductor layer  504 , a light emitting layer  505  and a second semiconductor layer  506 . The first semiconductor layer  504  is formed on the epitaxial substrate  503 , the light emitting layer  505  is formed on the first semiconductor layer  504 , and then the second semiconductor layer  506  is formed on the light emitting layer  505 . 
     As shown in  FIG. 12B , the epitaxial multilayer E is etched in step S 502 , so that the epitaxial multilayer E forms a plurality of side surfaces. In this embodiment, the etching process can be a dry etching process or a wet etching process. As shown in  FIG. 12C , a protective layer  508  is formed on the side surfaces and the epitaxial multilayer E (including the first semiconductor layer  504  and the second semiconductor layer  506 ) in step S 503 . In this step S 503 , the protective layer  508  has an opening O for forming electrodes in the later step. The material of the protective layer  508  is the same as that of the protective layer  108  of the first embodiment such as an insulating dielectric material (e.g. oxide, nitride or silicon carbide). In step S 504 , as shown in  FIG. 12D , a plurality of electrodes  510  are formed on the first semiconductor layer  504  and the second semiconductor layer  506  of the epitaxial multilayer E. Herein, part of the electrodes  510  is located between the side surfaces, thereby forming the structure of a LED device  50 . 
     As shown in  FIG. 12E , after forming the electrodes  510 , at least one temporary substrate  509  is formed on the LED device  50  in step S 505 . In the embodiment, the temporary substrate  509  covers the electrodes  510 . Alternatively, a temporary substrate is provided, and a curable material is formed between the temporary substrate and the LED device as an adhesive layer, and then the curable material is cured. The material and forming method of the temporary substrate  509  are the same as those of the temporary substrate  109  of the first embodiment, so the detailed descriptions are omitted. 
     After forming the temporary substrate  509 , as shown in  FIG. 12F , the epitaxial substrate  503  is removed in step S 506  so as to expose one side of the epitaxial multilayer E. In the embodiment, the first semiconductor layer  504  of the epitaxial multilayer E is exposed. Herein, the epitaxial substrate  503  can be removed by laser lift-off, laser ablation, polishing or etching. 
     As shown in  FIG. 12G , after the epitaxial substrate  503  is removed, a seed layer  501  is formed on the exposed side of the epitaxial multilayer E in step S 507 . In step S 508 , the seed layer  501  is composed of an insulating thermal-conductive layer  512  and a metal combining layer  513 . To be noted, the seed layer  501  not only includes a reflective layer, an ohmic contact layer and/or a transparent conductive layer, as the seed layer  101  of the first embodiment, but also includes the insulating thermal-conductive layer  512  and the metal combining layer  513 . In other words, the seed layer  501  is preferably composed of a reflective layer  511 , an ohmic contact layer, an insulating thermal-conductive layer  512  and a metal combining layer  513 . Alternatively, the seed layer  501  can be composed of an ohmic contact layer with the reflective function, an insulating thermal-conductive layer and a metal combining layer. The insulating thermal-conductive layer  512 , which is made of, for example, aluminum nitride or silicon carbide, can help the LED apparatus to achieve better anti-static and insulation. A material of the metal combining layer  513  includes nickel (Ni), copper (Cu), cobalt (Co), gold (Au), aluminum (Al) or a combination thereof. 
     As shown in  FIG. 12H , a patterned photoresist layer  502  is formed on the metal combining layer  513  of the seed layer  501  in step S 509 . The patterned photoresist layer  502  has a plurality of limiting areas LA. Then, as shown in  FIG. 12I , at least one thermal-conductive substrate  507  is formed on the LED device  50  in step S 510 . Herein, the thermal-conductive substrate  507  is formed on the seed layer  501 , and the location thereof is defined by the limiting areas LA of the patterned photoresist layer  502 . The material and forming method of the thermal-conductive substrate  507  are the same as those of the thermal-conductive substrate  107  of the first embodiment, so the detailed descriptions are omitted. 
     As shown in  FIG. 12J , in step S 511 , the temporary substrate  509  is removed so as to form a plurality of vertical LED apparatuses  12 . Since the curable material has the properties of removable, expansible and extensible, the temporary substrate  509  can be removed easily by heating, water heating, UV light, chemical solution or organic solution. While the temporary substrate  509  is removed, the first semiconductor layer  504 , the seed layer  501  and the insulating thermal-conductive layer  512  disposed between two LED apparatuses are simultaneously removed. Accordingly, the LED devices are separated to form a plurality of LED apparatuses  12 . 
     It is to be specified that the above-mentioned steps are unnecessary to be performed in the order of the embodiment, and they can be switched depending on the actual needs of processing. 
     Sixth Embodiment 
     With reference to  FIG. 13 , a manufacturing method of a plurality of LED apparatuses  14  according to a sixth embodiment of the invention includes the following steps S 601  to S 608 . The detailed illustrations of the manufacturing method will be described herein below with reference to  FIGS. 14A to 14G . 
     As shown in  FIG. 14A , in step S 601 , an epitaxial multilayer E, a seed layer  601  and a patterned photoresist layer  602  are in sequence formed on an epitaxial substrate  603 , thereby forming a LED device  60 . The epitaxial multilayer E includes a first semiconductor layer  604 , a light emitting layer  605  and a second semiconductor layer  606 . The first semiconductor layer  604  is formed on the epitaxial substrate  603 , the light emitting layer  605  is formed on the first semiconductor layer  604 , and then the second semiconductor layer  606  is formed on the light emitting layer  605 . The seed layer  601  is formed on the second semiconductor layer  606 , and further includes an insulating thermal-conductive layer  612  and a metal combining layer  613 . To be noted, the seed layer  601  includes a reflective layer, an ohmic contact layer and/or a transparent conductive layer as the seed layer  101  of the first embodiment, and further includes the insulating thermal-conductive layer  612  and the metal combining layer  613 . In other words, the seed layer  601  is preferably composed of a reflective layer, an ohmic contact layer, an insulating thermal-conductive layer and a metal combining layer. Alternatively, the seed layer  601  can be composed of an ohmic contact layer with the reflective function  611 , an insulating thermal-conductive layer  612  and a metal combining layer  613 . The insulating thermal-conductive layer  612 , which is made of, for example, aluminum nitride or silicon carbide, can help the LED apparatus to achieve better anti-static. A material of the metal combining layer  613  includes nickel (Ni), copper (Cu), cobalt (Co), gold (Au), aluminum (Al) or a combination thereof. 
     The patterned photoresist layer  602  is formed on the seed layer  601  and has a plurality of limiting areas LA. The material of the seed layer  601  is the same as that of the seed layer  601  of the first embodiment, so the detailed descriptions are omitted. 
     As shown in  FIG. 14B , at least one thermal-conductive substrate  607  is formed on the LED device  60  in step S 602 . Herein, the thermal-conductive substrate  607  is formed on the seed layer  601  by electrochemical deposition, non-electroplating, electroforming or electroplating. The position of the thermal-conductive substrate  607  is defined by the limiting areas LA of the patterned photoresist layer  602 . A material of the thermal-conductive substrate  607  includes a thermal-conductive metal, such as nickel (Ni), copper (Cu), cobalt (Co), gold (Au) or aluminum (Al). To be noted, the thermal-conductive substrate  607  can be composed of a single material or be composed of multiple thermal-conductive metals and include a plurality of layers, such as three layers of Cu—Ni—Cu or Ni—Cu—Ni. The above examples are for illustrations only without limiting the scope of the invention, and any design capable of achieving good thermal conducting effect can be applied in this embodiment. 
     As shown in  FIG. 14C , at least one temporary substrate  609  is formed on the LED device  60  in step S 603 . In the embodiment, the temporary substrate  609  covers the thermal-conductive substrate  607 . Alternatively, a temporary substrate is provided, and a curable material is formed between the temporary substrate and the LED device as an adhesive layer, and then the curable material is cured. The material and forming method of the temporary substrate  609  are the same as those of the temporary substrate  109  of the first embodiment, so the detailed descriptions are omitted. 
     After forming the temporary substrate  609 , as shown in  FIG. 14D , the epitaxial substrate  603  is removed in step S 604  so as to expose one side of the epitaxial multilayer E. In the embodiment, the first semiconductor layer  604  of the epitaxial multilayer E is exposed. Herein, the epitaxial substrate  603  can be removed by laser lift-off, laser ablation, polishing or etching. 
     As shown in  FIG. 14E , in step S 605 , the seed layer  601  and the epitaxial multilayer E between two of the thermal-conductive substrates  607  and exposed from the epitaxial multilayer E are etched away, so that each of the seed layer  601  and the epitaxial multilayer E forms a plurality of side surfaces, and a portion of the second semiconductor layer  606  is exposed. Herein, the etching step can be performed by a dry etching process or a wet etching process. 
     As shown in  FIG. 14F , a protective layer  608  is formed on the side surfaces and the epitaxial multilayer E in step S 606 . In this step S 606 , the protective layer  608  has an opening for forming electrodes in the later step. The material of the protective layer  608  is an insulating dielectric material such as oxide, nitride or silicon carbide. In step S 607 , a plurality of electrodes  610  are formed on the exposed side of the epitaxial multilayer E, and the exposed portion of the second semiconductor layer. The electrodes  610  are located in the opening of the protective layer  608 , and a part of the electrodes  610  are disposed between the side surfaces. 
     As shown in  FIG. 14G , in step S 608 , the temporary substrate  609  is removed after forming the electrodes  610 , so that a plurality of LED apparatuses  14  can be formed. Since the curable material has the properties of removable, expansible and extensible, the temporary substrate  609  can be removed easily by heating, water heating, UV light, chemical solution or organic solution. 
     It is to be specified that the above-mentioned steps are unnecessary to be performed in the order of the embodiment, and they can be switched depending on the actual needs of processing. 
     Seventh Embodiment 
     With reference to  FIG. 15 , a manufacturing method of a plurality of LED apparatuses  16  according to a seventh embodiment of the invention includes the following steps S 701  to S 708 . The detailed illustrations of the manufacturing method will be described herein below with reference to  FIGS. 16A to 16I . 
     As shown in  FIGS. 16A to 16C , in step S 701 , an epitaxial multilayer E, an patterned etching stop layer  714 , a seed layer  701  and a patterned photoresist layer  702  are in sequence formed on an epitaxial substrate  703 , thereby forming a LED device  70 . The epitaxial multilayer E, the seed layer  701  and the patterned photoresist layer  702  are illustrated in the above-mentioned embodiments, so the detailed descriptions are omitted. The patterned photoresist layer  702  has a plurality of limiting areas LA. A material of the patterned etching stop layer  714  includes oxide, nitride or silicon carbide. 
     As shown in  FIG. 16D , in step S 702 , at least one thermal-conductive substrate  707  is formed on the LED device  70  of  FIG. 16C . The thermal-conductive substrate  707  is illustrated in the above-mentioned embodiments, so the detailed descriptions are omitted. 
     As shown in  FIG. 16E , in step S 703 , at least one temporary substrate  709  is formed on the LED device  70 . In the embodiment, the temporary substrate  709  covers the thermal-conductive substrate  707 . Alternatively, a temporary substrate is provided, and a curable material is formed between the temporary substrate and the LED device as an adhesive layer, and then the curable material is cured. The temporary substrate  709  is illustrated in the above-mentioned embodiments, so the detailed descriptions are omitted. 
     As shown in  FIG. 16F , the epitaxial substrate  703  is removed in step S 704 . The method for removing the epitaxial substrate  703  is illustrated hereinabove, so the detailed descriptions are omitted. Then, as shown in  FIG. 16G , the epitaxial multilayer E is etched to the patterned etching stop layer  714  in step S 705  so that the epitaxial multilayer E forms a plurality of side surfaces. The patterned etching stop layer  714  can provide the stopping and buffering effects when performing the step of etching the epitaxial multilayer E. Thus, the seed layer  701  containing metal materials is prevented from being etched, so that the conventional current leakage caused by the metal particles from the etched seed layer attaching to the side surfaces of the epitaxial multilayer can be avoided. 
     As shown in  FIG. 16H , a protective layer  708  is formed on the side surfaces in step S 706 . In step S 707 , a plurality of electrodes  710  are formed on the epitaxial multilayer E. The functions of the protective layer  708  and the electrodes  710  are illustrated in the above-mentioned embodiments, so the detailed descriptions are omitted. 
     As shown in  FIG. 161 , in step S 708 , the temporary substrate  709  is removed so as to form a plurality of vertical LED apparatuses  16 . The function and advantage of the temporary substrate  709  are illustrated in the above-mentioned embodiments, so the detailed descriptions are omitted. 
     It is to be specified that the above-mentioned steps are unnecessary to be performed in the order of the embodiment, and they can be switched depending on the actual needs of processing. 
     Eighth Embodiment 
     With reference to  FIG. 17 , a manufacturing method of a plurality of LED apparatuses  18  according to an eighth embodiment of the invention includes the following steps SB 01  to SB 08 . The detailed illustrations of the manufacturing method will be described herein below with reference to  FIGS. 18A to 18I . 
     As shown in  FIGS. 18A to 18C , in step SB 01 , an epitaxial multilayer E, an patterned etching stop layer B 14 , a seed layer B 01  and a patterned photoresist layer B 02  are in sequence formed on an epitaxial substrate B 03 , thereby forming a LED device B 0 . As shown in  FIG. 18D , in step SB 02 , at least one thermal-conductive substrate B 07  is formed on the LED device B 0  of  FIG. 18C . As shown in  FIG. 18E , in step SB 03 , at least one temporary substrate B 09  is formed on the LED device B 0 . In the embodiment, the temporary substrate B 09  covers the thermal-conductive substrate B 07 . Alternatively, a temporary substrate is provided, and a curable material is formed between the temporary substrate and the LED device as an adhesive layer, and then the curable material is cured. 
     As shown in  FIG. 18F , the epitaxial substrate B 03  is removed in step SB 04 . Then, as shown in  FIG. 18G , the epitaxial multilayer E is etched to the patterned etching stop layer B 14  in step SB 05  so that the epitaxial multilayer E forms a plurality of side surfaces, and a portion of the second semiconductor layer B 06  is exposed. As shown in  FIG. 18H , a protective layer B 08  is formed on the side surfaces in step SB 06 . In step SB 07 , a plurality of electrodes B 11  are formed on the epitaxial multilayer E, and part of the electrodes B  10  is disposed between the protective layers B 08  on the exposed portion of the second semiconductor layer B 06 . As shown in  FIG. 181 , the temporary substrate B 09  is removed to form a plurality of LED apparatuses  21 . The function and advantage of the temporary substrate B 09  are illustrated in the above-mentioned embodiments, so the detailed descriptions are omitted. 
     It is to be specified that the above-mentioned steps are unnecessary to be performed in the order of the embodiment, and they can be switched depending on the actual needs of processing. 
     In summary, the manufacturing method of a LED apparatus according to the invention is to form a temporary substrate on the LED device directly by the curable material and to form at least one thermal-conductive substrate on the LED device. Compared with the prior art, the invention does not need the conventional step of adhering the semiconductor structure to another substrate with an adhering layer. In addition, since the temporary substrate is made of the curable material, which has the properties of removable, expansible and extendible, it can be easily removed so as to separate the LED devices, thereby forming a plurality of LED apparatuses. Therefore, the current leakage caused by the dicing process can be prevented, thereby decreasing the production cost and increasing the production yield. 
     In addition, the thermal-conductive substrate of the invention is formed by electrochemical deposition, non-electroplating, electroforming or electroplating, so that the invention does not need the conventional transparent adhering layer, which causes poor heat dissipation. In addition, the invention also does not need the high-temperature high-pressure process, which causes diffusion. Accordingly, the heat dissipation effect and production yield of the invention can be enhanced. Moreover, the invention further arranges the protective layer for preventing the current leakage. 
     Although the invention has been described with reference to specific embodiments, this description is not meant to be construed in a limiting sense. Various modifications of the disclosed embodiments, as well as alternative embodiments, will be apparent to persons skilled in the art. It is, therefore, contemplated that the appended claims will cover all modifications that fall within the true scope of the invention.