Electromagnetic radiation emitting semiconductor chip and procedure for its production

A semiconductor chip which emits electromagnetic radiation, comprising:

• an epitaxially produced semiconductor layer stack based on nitride semiconductor material, which includes an n-conducting semiconductor layer, a p-conducting semiconductor layer and an electromagnetic radiation generating region which is arranged between these two semiconductor layers;
• a base, on which the semiconductor layer stack is arranged;
• and
• a mirror layer comprising a highly reflective layer, a protective layer and a joining layer, said mirror layer being arranged between the semiconductor layer stack and the base;
• wherein the n-conducting semiconductor layer faces away from the base;
• and
• wherein the n-conducting semiconductor layer or an outcoupling layer located on the n-conducting semiconductor layer has a radiation-outcoupling surface which in turn includes a plurality of planar outcoupling sub-surfaces which are positioned obliquely with respect to a main plane of the radiation-generating region and each form an angle of between 15° and 70° with this plane.