Patent ID: 7851997

Claim:
A light emitting element comprising: a first electrode layer; a first insulating layer comprising silicon, oxygen and nitrogen, over the first electrode layer; an electroluminescent layer comprising an inorganic compound in contact with the first insulating layer; a second insulating layer comprising silicon, oxygen and nitrogen over the electroluminescent layer; and a second electrode layer over the second insulating layer, wherein a concentration of oxygen contained in the first insulating layer decreases from the first electrode layer side toward the electroluminescent layer side, and a concentration of nitrogen contained in the first insulating layer increases from the first electrode layer side toward the electroluminescent layer side, and wherein a concentration of oxygen contained in the second insulating layer decreases from the second electrode layer side toward the electroluminescent layer side, and a concentration of nitrogen contained in the second insulating layer increases from the second electrode layer side toward the electroluminescent layer side.