Reversible Photoswitchable Fluorescence in Thin Films of Inorganic Nanoparticle and Polyoxometalate Assemblies

摘要

Nanostructures with reversible photoswitchable fluorescence havenreceived much scientific and technical interest due to their potentialnapplications in the fields of both optical information recording andnbioimaging.n1nSuch nanostructures are normally composed ofnphotochromic dyads and luminescent dyads/inorganic nanoparticlesn(NPs).n2,3nUnder photostimulation, the geometrical or electronicnstructures of the photochromic dyads are changed, which activatedeactivate the electron or energy transfer between the photochromicnand luminescent components, leading to fluorescence switching ofnthe nanostructures. Although much progress has been made, thennanostructures with reversible photoswitchable fluorescence neednto be further improved before getting into the practical applications.nFor example, the possible photodegradation of organic photochro-nmic dyads under photoirradiation may prevent repetitive use of thennanostructures.