The light emitting device 1, wherein {TAIL ~ the semiconductor layer} is {HEAD ~ a GaN layer} 
The light emitting device 1 , wherein { TAIL ~ the semiconductor layer } is { HEAD ~ a GaN layer }
OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD