| http://www.w3.org/ns/prov#value | - a substrate; a plurality of group III nitride compound semiconductor layer formed on said substrate; a first positive electrode layer which is formed above a p-type semiconductor layer, reflects light toward said substrate, and comprises at least one of silver (Ag), platinum (Pt), palladium (Pd) and an alloy including at least one of these metals; a second positive electrode layer comprising at le
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