“…To achieve controlled release of a drug, a prodrug strategy has been adopted. To date, various strategies have been utilized for the site-selective activation of prodrugs, such as pH, redox, reactive oxygen species, enzymes, catalysts, temperature, light, etc. − Among these, the light-triggered prodrug activation strategy is superior to the others since the release of the drug can be modulated simply by adjusting the wavelength, intensity, or time of exposure of light, affording high spatiotemporal control over the release process. Along with spatiotemporally controlled activation of the prodrug, in recent years real-time monitoring of drug release systems has received considerable attention.…”