Green-Light Static Rewritable Optical Storage Properties of a Novel CuTCNQ Derivative Thin Film

A novel charge-transfer complex film: copper-(n-propyl ester 7,7,8,8- tetracyanoquinodimethane-2,5-ylene-(3-propionic acid)) (Cu-TCNQ(C2H4 COOC3H7)2 ) was prepared by spin-coating. Absorption spectra, green-light (514.5nm) static rewritable optical recording properties and rewritable mechanism of this film were studied.The results show that there are two strong absorption peaks at 388nm and 675nm, which can be assigned to electronic transitions in anion radical TCNQ( C2H4 COOC3H7 )2^-. Green-fight optical storage experimental results of this film were as follows: write-in power was 9mW, pulse duration was 80ns; erasing power was 4mW, pulse duration was 500ns; the reflectivity contrast C ≥ 15%; number of write-erase cycles N ≥ 100. It is found that the realization of rewritable optical storage of the Cu-TCNQ(C2H4COOCsH7)2 film is related to the reversible changes of the optical properties, which is caused by the reversible charge transfer between copper and n-propyl ester 7, 7,8,8- tetracyanoquinodimethane-2,5-ylene-(3-propionic acid) in the complex through inducement of laser irradiation.