Photochromic material

A photochromic dye having at least two different photo-reactive groups coupled to one another, comprising:

• a first photo-reactive group coupled to a second photo-reactive group that is different from the first photo-reactive group, wherein the first photo-reactive group and the second photo-reactive group are independently represented by Formula I:
• wherein, R1, R3 to R8, and R10 to R11 independently represent hydrogen, a halogen, a substituted or unsubstituted C1-12 alkyl, a substituted or unsubstituted C1-12 alkoxy, a substituted or unsubstituted C1-12 alkenyl, a substituted or unsubstituted C1-12 conjugated alkyl, a substituted or unsubstituted aryl group, or a substituted or unsubstituted heteroaryl group;
• or the substituents together form an alkylene or alkenylene chain completing an aryl group;
• and wherein:
• R2 and R9 independently represent a substituted or unsubstituted aryl group, or a substituted or unsubstituted heteroaryl group;
• or R2 and R3 and R9 and R10 together form an alkylene or alkenylene chain completing an aryl group.