A III group nitride system compound semiconductor light emitting element has: a transparent substrate that is of a material except for III group nitride system compound semiconductor; a convex light trapping member that is formed directly or through a buffer layer on the surface of the transparent substrate;...http://www.google.co.uk/patents/US7071495?utm_source=gb-gplus-sharePatent US7071495 - III group nitride system compound semiconductor light emitting element and method of making same
