an organic layer formed on the first electrode, the organic layer including {HEAD ~ at least an organic light} emitting {TAIL ~ layer}; and 
an organic layer formed on the first electrode , the organic layer including { HEAD ~ at least an organic light } emitting { TAIL ~ layer } ; and
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL OTH OTH