The visible emission from the activator ions preferably complementing {HEAD ~ the band edge emission} of the LED in {TAIL ~ order} to produce an overall white emission from the LED 
The visible emission from the activator ions preferably complementing { HEAD ~ the band edge emission } of the LED in { TAIL ~ order } to produce an overall white emission from the LED
OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH REL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH