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