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