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