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