Upon UV illumination {HEAD ~ the dye compounds} display intense absorption as well as {TAIL ~ visible fluorescence emission} 
display
Upon UV illumination { HEAD ~ the dye compounds } display intense absorption as well as { TAIL ~ visible fluorescence emission }
OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL