wherein the aromatic compound is an organic pigment, {HEAD ~ an organic light emitter}, or {TAIL ~ an organic semiconductor} 
wherein the aromatic compound is an organic pigment , { HEAD ~ an organic light emitter } , or { TAIL ~ an organic semiconductor }
OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL