LIGHT-EMITTING ELEMENT AND METHOD FOR MANUFACTURING LIGHT-EMITTING ELEMENT

摘要

A second electrode (16) formed on a second main surface of a compound semiconductor layer (100) of a light emitting element (1) is arranged in contact with the second main surface of the compound semiconductor layer (100) and has a junction alloying layer (31) for reducing the resistance due to the junction with said compound semiconductor layer (100) and a solder layer (34) for connecting said junction metal layer to an electroconductive support (52). In the solder layer (34), there are formed an Sn-based solder layer (34s) which is arranged on the junction alloying layer (31) side and comprises an Sn-based metal containing Sn as a main component and having a melting point lower than that of the junction alloying layer (31) and an Au-Sn based solder layer (34m) which is arranged on the side opposite to the junction alloying layer (31) with respect to said Sn-based solder layer (34s) and in contact therewith and contains 30 to 90 mass % of Au and 10 to 70 mass % of Sn and has a total content of Au and Sn of 80 mass % or more and has a melting point higher than that of the Sn-based solder layer (34s). The above structure of an element is excellent in the reliability of the junction between an Au-Sn based solder layer and a junction alloying layer, which results in making the Au-Sn based solder layer less prone to exfoliation, in the case of a light-emitting element which adopts the mounting using an Au-Sn based solder layer.