A light emitting device includes an emissive substance between an anode and {TAIL ~ cathode} that emits light upon application of {HEAD ~ electrical energy} 
A light emitting device includes an emissive substance between an anode and { TAIL ~ cathode } that emits light upon application of { HEAD ~ electrical energy }
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD