Abstract:
A nitride light-emitting device having an adhesive reflecting layer includes a transparent adhesive layer, a nitride light-emitting stack layer and a metal reflecting layer. The transparent adhesive layer adheres the nitride light-emitting stack layer and the metal reflecting layer. Therefore, the metal reflecting layer can reflect light emitted from the light-emitting stack layer to increase the brightness of the nitride light-emitting device.

Description:
BACKGROUND OF INVENTION 
   1. Field of the Invention 
   The present invention relates to a light-emitting component, and more particularly, to a nitride light-emitting component with an adhesive reflecting layer. 
   2. Description of the Prior Art 
   The applications of light-emitting diodes are extensive and include optical display devices, traffic signals, data storing devices, communication devices, illumination devices, and medical apparatuses. As such, it is important to increase the brightness of light-emitting diodes. 
   Traditionally, an oxide-reflecting layer is deposited onto a transparent substrate to increase brightness of a nitride light-emitting device. The oxide-reflecting layer reflects light emitted from a light-emitting stack layer to increase overall brightness. However, the oxide-reflecting layer only reflects light of perpendicular incidence and specific wavelength. In addition, during the manufacturing process, the oxide-reflecting layer can be stripped by external force. Therefore, the reflecting efficiency of the oxide-reflecting layer is low. 
   Moreover, a metal layer is deposited on the transparent substrate to reflect light emitted from the light-emitting stack layer. The reflecting efficiency of the metal layer is better than the oxide-reflecting layer, but the adhesive force between the substrate and the metal is weak. In order to increase the adhesive force, a titanium or chromium layer is formed between the substrate and the metal layer. However, the titanium or chromium layer absorbs light so as to decrease the overall reflecting efficiency. 
   SUMMARY OF INVENTION 
   It is therefore a primary objective of the claimed invention to provide a transparent adhesive layer between the metal layer and the light-emitting layer to solve the above-mentioned problem. Light from the light-emitting stack layer penetrates the transparent adhesive layer and is reflected by the metal layer. In addition, reaction layers are formed on an upper surface of the transparent adhesive layer to contact the nitride light-emitting layer and on a lower surface of the transparent adhesive layer to contact the metal layer. The reaction layers react with the transparent adhesive layer to increase the adhesive force and provide resistance to being stripped. Moreover, a metal heat sink is plated on another surface of the metal layer so as to increase the brightness of the light-emitting device. 
   According to the claimed invention, a nitride light-emitting device having an adhesive reflecting layer comprising a first substrate, a metal reflecting layer formed on the first substrate, a first reaction layer formed on the metal reflecting layer, a transparent adhesive layer formed on the first reaction layer, a second reaction layer formed on the transparent adhesive layer, a second substrate formed on the second reaction layer, a nitride first contact layer formed on the second substrate, an upper surface of the nitride first contact layer having a first section and a second section, a nitride first cladding layer formed on the first section, a nitride light-emitting layer formed on the nitride first cladding layer, a nitride second cladding layer formed on the nitride light-emitting layer, a nitride second contact layer formed on the nitride second cladding layer, a transparent conductive layer formed on the nitride second contact layer, a first electrode formed on the transparent conductive layer, and a second electrode formed on the second section. 
   The first substrate comprises at least one material selected from a material group consisting of silicon, GaAs, glass, quartz, GaP, GaAsP, AlGaAs, and metal. The second substrate comprises at least one material selected from a material group consisting of Al 2 O 3 , SiC, ZnO, and GaN. The transparent adhesive layer comprises at least one material selected from a material group consisting of PI, BCB, and PFCB. The first reaction layer comprises at least one material selected from a material group consisting of SiNx, Ti, and Cr. The second reaction layer comprises at least one material selected from a material group consisting of SiNx, Ti, and Cr. The metal reflecting layer comprises at least one material selected from a material group consisting of In, Sn, Al, Au, Pt, Zn, Ag, Pb, Pd, Ge, Cu, AuBe, AuGe, Ni, PbSn, and AuZn. The nitride first cladding layer comprises at least one material selected from a material group consisting of AlN, GaN, AlGaN, InGaN, and AlInGaN. The nitride light-emitting layer comprises at least one material selected from a material group consisting of GaN, InGaN, and AlInGaN. The nitride second cladding layer comprises at least one material selected from a material group consisting of AlNGaN, GaN, AlGaN, InGaN, and AlInGaN. The nitride first contact layer or the nitride second contact layer comprises at least one material selected from a material group consisting of GaN, InGaN, and AlGaN. The transparent conductive layer comprises at least one material selected from a material group consisting of indium tin oxide, cadmium tin oxide, antimony tin oxide, zinc oxide, and zinc tin oxide. 
   These and other objectives of the claimed invention will no doubt become obvious to those of ordinary skill in the art after reading the following detailed description of the preferred embodiment that is illustrated in the various figures and drawings. 

   
     BRIEF DESCRIPTION OF DRAWINGS 
       FIG. 1  is a side view of a nitride light-emitting device having an adhesive reflecting layer of a preferred embodiment according to the present invention. 
       FIG. 2  is a side view of a nitride light-emitting device having an adhesive reflecting layer of another preferred embodiment according to the present invention. 
       FIG. 3  is a side view of a nitride light-emitting device having an adhesive reflecting layer of another preferred embodiment according to the present invention. 
       FIG. 4  is a side view of a nitride light-emitting device having an adhesive reflecting layer of another preferred embodiment according to the present invention. 
       FIG. 5  is a side view of a nitride light-emitting device having an adhesive reflecting layer of another preferred embodiment according to the present invention. 
   

   DETAILED DESCRIPTION 
   Please refer to  FIG. 1 .  FIG. 1  is a side view of a nitride light-emitting device  1  with an adhesive reflecting layer of a preferred embodiment according to the present invention. The nitride light-emitting device  1  comprises a first substrate  10 , a metal reflecting layer  11  formed on the first substrate  10 , a first reaction layer  120  formed on the metal reflecting layer  11 , a transparent adhesive layer  121  formed on the first reaction layer  120 , a second reaction layer  122  formed on the transparent adhesive layer  121 , a second substrate  13  formed on the second reaction layer  122 , a nitride first contact layer  14  formed on the second substrate  13  wherein an upper surface of the nitride first contact layer  14  has a first section and a second section, a nitride first cladding layer  150  formed on the first section, a nitride light-emitting layer  151  formed on the nitride first cladding layer  150 , a nitride second cladding layer  152  formed on the nitride light-emitting layer  151 , a nitride second contact layer  16  formed on the nitride second cladding layer  152 , a first electrode  17  formed on the second section, and a second electrode  18  formed on the nitride second contact layer  16 . 
   Please refer to  FIG. 2 .  FIG. 2  is a side view of a nitride light-emitting device  2  with an adhesive reflecting layer of another preferred embodiment according to the present invention. The structure of the nitride light-emitting device  2  is similar to the nitride light-emitting device  1  in the former preferred embodiment. The difference is that the first substrate  10  in the former preferred embodiment is replaced with a metal heat sink  20  so that the light-emitting device  2  can conduct heat fast. 
   Please refer to  FIG. 3 .  FIG. 3  is a side view of a nitride light-emitting device  3  with an adhesive reflecting layer of another preferred embodiment according to the present invention. The difference between the light-emitting device  1  and the light-emitting device  3  is that the first substrate  10  of the light-emitting device  1  is removed in the light-emitting device  3 . 
   Please refer to  FIG. 4 .  FIG. 4  is a side view of a nitride light-emitting device  4  with an adhesive reflecting layer of another preferred embodiment according to the present invention. The nitride light-emitting device  4  comprises a first substrate  40 , a metal reflecting layer  41  formed on the first substrate  40 , a first reaction layer  420  formed on the metal reflecting layer  41 , a transparent adhesive layer  421  formed on the first reaction layer  420 , a second reaction layer  422  formed on the transparent adhesive layer  421 , a transparent conductive layer  43  formed on the second reaction layer  422  wherein an upper surface of the transparent conductive layer  43  has a first section and a second section, a nitride first contact layer  44  formed on the first section, a nitride first cladding layer  450  formed on the nitride first contact layer  44 , a nitride light-emitting layer  451  formed on the nitride first cladding layer  450 , a nitride second cladding layer  452  formed on the nitride light-emitting layer  451 , a nitride second contact layer  46  formed on the nitride second cladding layer  452 , a first electrode  47  formed on the second section, and a second electrode  48  formed on the nitride second contact layer  46 . 
   Please refer to  FIG. 5 .  FIG. 5  is a side view of a nitride light-emitting device  5  with an adhesive reflecting layer of another preferred embodiment according to the present invention. The nitride light-emitting device  5  comprises a metal heat sink  501 , a first substrate  50  formed on the metal heat sink  501 , a metal reflecting layer  51  formed on the first substrate  50 , a first reaction layer  520  formed on the metal reflecting layer  51 , a transparent adhesive layer  521  formed on the first reaction layer  520 , a second reaction layer  522  formed on the transparent adhesive layer  521 , a transparent conductive layer  53  formed on the second reaction layer  522  wherein an upper surface of the transparent conductive layer  53  has a first section and a second section, a nitride first contact layer  54  formed on the first section, a nitride first cladding layer  550  formed on the nitride first contact layer  54 , a nitride light-emitting layer  551  formed on the nitride first cladding layer  550 , a nitride second cladding layer  552  formed on the nitride light-emitting layer  551 , a nitride second contact layer  56  formed on the nitride second cladding layer  552 , a first electrode  57  formed on the second section, and a second electrode  58  formed on the nitride second contact layer  56 . 
   In each said preferred embodiment, a transparent conductive layer can be formed on the nitride second contact layer and under the second electrode to be an ohmic contact layer and a current distribution layer. 
   The first substrate  10 ,  40 ,  50  comprises at least one material selected from a material group consisting of silicon, GaAs, glass, quartz, GaP, GaAsP, AlGaAs, and metal, or other substitute materials. The second substrate  13  comprises at least one material selected from a material group consisting of Al 2 O 3 , SiC, ZnO, and GaN. The transparent adhesive layer  121 ,  421 ,  521  comprises at least one material selected from a material group consisting of PI, BCB, and PFCB. The first reaction layer  120 ,  420 ,  520  comprises at least one material selected from a material group consisting of SiNx, Ti, and Cr. The second reaction layer  122 ,  422 ,  522  comprises at least one material selected from a material group consisting of SiNx, Ti, and Cr. The metal heat sink  20 ,  501  comprises at least one material selected from a material group consisting of Sn, Al, Au, Pt, Zn, Ag, Pb, Pd, Ge, Cu, AuBe, AuGe, ni, PbSn, and AuZn, or other substitute materials. The metal reflecting layer  11 ,  41 ,  51  comprises at least one material selected from a material group consisting of In, Sn, Al, Au, Pt, Zn, Ag, Pb, Pd, Ge, Cu, AuBe, AuGe, Ni, PbSn, and AuZn. The nitride first cladding layer  150 ,  450 ,  550  comprises at least one material selected from a material group consisting of AlN, GaN, AlGaN, InGaN, and AlInGaN. The nitride light-emitting layer  151 ,  451 ,  551  comprises at least one material selected from a material group consisting of GaN, InGaN, and AlInGaN. The nitride second cladding layer  152 ,  452 ,  552  comprises at least one material selected from a material group consisting of AlNGaN, GaN, AlGaN, InGaN, and AlInGaN. In addition, the nitride first contact layer  14 ,  44 ,  54  or the nitride second contact layer  16 ,  46 ,  56  can comprise at least one material selected from a material group consisting of GaN, InGaN, and AlGaN. The transparent conductive layer  43 ,  53  comprises at least one material selected from a material group consisting of indium tin oxide, cadmium tin oxide, antimony tin oxide, zinc oxide, and zinc tin oxide. 
   Those skilled in the art will readily observe that numerous modifications and alterations of the device may be made while retaining the teachings of the invention. Accordingly, the above disclosure should be construed as limited only by the metes and bounds of the appended claims.