The method 1 wherein {HEAD ~ the P N junction} is doped with {TAIL ~ more than one luminescent activator ion} 
is doped with
The method 1 wherein { HEAD ~ the P N junction } is doped with { TAIL ~ more than one luminescent activator ion }
OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL REL REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL