Patent ID: 8716737

Claim:
A light emitting diode (LED), comprising: a first intermetallic layer; a first metal thin film layer, located on the first intermetallic layer, wherein a material of the first metal thin film layer is Au, Ag, Cu, or Ni; an LED chip, located on the first metal thin film layer; a substrate; a second metal thin film layer, located on the substrate, wherein a material of the second metal thin film layer is Au, Ag, Cu, or Ni; and a second intermetallic layer, located on the second metal thin film layer, and the first intermetallic layer located on the second intermetallic layer, wherein materials of the first and second intermetallic layers are selected from the group consisting of a Cu—In—Sn intermetallics, an Ni—In—Sn intermetallics, an Ni—Bi intermetallics, an Au—In intermetallics, an Ag—In intermetallics, an Ag—Sn intermetallics, and an Au—Bi intermetallics, wherein the first intermetallic layer and the second intermetallic layer are formed by heating a die-bonding material layer located between the first metal thin film layer and the second metal thin film layer, such that diffusion occurs between the first metal thin film layer and the die-bonding material layer to form the first intermetallic layer, and diffusion occurs between the second metal think film layer and the die-bonding material layer to form the second intermetallic layer; and wherein a melting point of the die-bonding material is lower than 110° C., and a melting point of the first intermetallic layer and the second intermetallic layer is higher than 200° C.