The display apparatus 22, wherein {HEAD ~ said oxysulfide} is {TAIL ~ yttrium oxysulfide}, and said luminescent center substance is europium 
is
The display apparatus 22 , wherein { HEAD ~ said oxysulfide } is { TAIL ~ yttrium oxysulfide } , and said luminescent center substance is europium
OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH