Abstract: A method of manufacturing a semiconductor device comprises a mounting step of mounting a semiconductor element having an Au—Sn layer on a substrate, wherein the mounting step includes a paste supplying step of supplying an Ag paste having an Ag nanoparticle onto the substrate, a device mounting step of mounting a side of the Au—Sn layer of the semiconductor element on the Ag paste, and a bonding step of alloying the Au—Sn layer and the Ag paste to bond the semiconductor element to the substrate, wherein the Au—Sn layer has a content rate of Au of 50 at % to 85 at %.

Abstract: An object of the present invention is to provide a LED module, capable of protecting LED chips from an excessive voltage, at low cost. An LED module for lighting includes a wiring substrate having a plurality of wiring patterns formed thereon, and a plurality of LED chips connected to the wiring patterns so as to constitute a series circuit or a series-parallel circuit. In the LED module, the wiring patterns comprises an anode side wiring pattern constituting an anode side electrode of the circuit, and a cathode side wiring pattern constituting a cathode side electrode of the circuit, the anode side wiring pattern and the cathode side wiring pattern are disposed to surround connection regions of the wiring patterns with the LED chips, and forms guard electrodes, and both edge portions of the anode side wiring pattern face both edge portions of the cathode side wiring pattern with gaps, respectively.

Abstract: There is a reflective layer covering almost the entire surface of the light emitting portion except the portions where the light emitting elements are arranged, it is possible to increase the reflectivity of the light emitting portion to realize a higher luminance. In addition, the heat generated from the light emitting elements can be dissipated through the reflective layer, so that it is possible to prevent overheat of the light emitting device, and it is thus possible to improve the reliability of the light emitting device.

Abstract: There is a reflective layer covering almost the entire surface of the light emitting portion except the portions where the light emitting elements are arranged, it is possible to increase the reflectivity of the light emitting portion to realize a higher luminance. In addition, the heat generated from the light emitting elements can be dissipated through the reflective layer, so that it is possible to prevent overheat of the light emitting device, and it is thus possible to improve the reliability of the light emitting device.

Abstract: An object of the present invention is to provide a LED module, capable of protecting LED chips from an excessive voltage, at low cost. An LED module for lighting includes a wiring substrate having a plurality of wiring patterns formed thereon, and a plurality of LED chips connected to the wiring patterns so as to constitute a series circuit or a series-parallel circuit. In the LED module, the wiring patterns comprises an anode side wiring pattern constituting an anode side electrode of the circuit, and a cathode side wiring pattern constituting a cathode side electrode of the circuit, the anode side wiring pattern and the cathode side wiring pattern are disposed to surround connection regions of the wiring patterns with the LED chips, and forms guard electrodes, and both edge portions of the anode side wiring pattern face both edge portions of the cathode side wiring pattern with gaps, respectively.