It emits {HEAD ~ a light} in {TAIL ~ ultraviolet and visible regions} when it is irradiated with a light or a radiation 
in
It emits { HEAD ~ a light } in { TAIL ~ ultraviolet and visible regions } when it is irradiated with a light or a radiation
OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH