Aza[3.2.1]bridged ring substituted fluorescent dye and preparation method and use thereof

An aza[3.2.1]bridged ring substituted fluorescent dye, wherein the aza[3.2.1]bridged ring substituted fluorescent dye has a structure shown in Formula (I), Formula (II) or Formula (III) below:

• Ra, Rb, Rc, Ra, Re, Rf, Rg, Rh, Ri, Rj, Rk, Rl, Rm, Rn, Ro, Rp and Rq are independently selected from hydrogen, halogen, carboxyl, substituted or unsubstituted C1-C20 alkyl, substituted or unsubstituted C3-C20 cycloalkyl, substituted or unsubstituted C4-C20 cycloalkylalkyl, C4-C20 alkylcycloalkyl, substituted or unsubstituted C1-C20 alkoxyl, substituted or unsubstituted C1-C20 ester group, and substituted or unsubstituted C1-C20 acylamino;
• RA is selected from substituted or unsubstituted C6-C40 aryl, substituted or unsubstituted C6-C40 aralkyl, and substituted or unsubstituted C5-C40 heteroaryl;
• X is selected from oxygen, sulfur, substituted or unsubstituted C1-C20 alkylene,
• Y is selected from oxygen, sulfur, nitrogen, substituted or unsubstituted C1-C20 alkylene, substituted or unsubstituted C1-C20 alkylenoxyl, substituted or unsubstituted C1-C20 acyl, substituted or unsubstituted C1-C20 ester group,
• wherein RB is selected from substituted or unsubstituted C1-C20 alkyl, substituted or unsubstituted C1-C20 alkoxyl, substituted or unsubstituted C1-C20 acyl, and substituted or unsubstituted C1-C20 ester group;
• Z− is selected from F−, Cl−, Br−, I−, OAc−, HSO4−, H2PO4−, ClO4−, CF3COO−, CF3SO3−, CH3 SO3−, NO3−, C5H7O5COO−, and PF6−;
• and m is an integer ranged from 1 to 3.