Patent ID: 8722905

Claim:
A dye, having a chemical formula: wherein each R 1 is independently selected from hydrogen, —(C x H 2x+1 ), —(C y H 2y )—S—(C x H 2x+1 ), or —(C y H 2y )—N(C x H 2x+1 ) 2 ; Ar 1 is wherein each R 2 is independently selected from —(C x H x+1 ), —(C x H 2x )—S—(C x H 2x+1 ), or —(C x H 2x )—N(C x H 2x+1 ) 2 ; Ar 2 is wherein each R 3 is independently selected from hydrogen, —(C x H 2x+1 ), —(C y H 2y )—S—(C x H 2x+1 ), or —(C y H 2y )—N(C x H 2x+1 ) 2 ; X is sulfur, oxygen, selenium, or N—R 4 , and R 4 is —(C x H 2x+1 ); m is in integer of 1 to 4; x is an integer of 1 to 20; and y is an integer of 0 to 20.