• • Monolayer subnanometric polymersomes (MSNPSs) achieve vesicular thicknesses of ~12.0 Å and diameters of ~250 nm, enabling ultracompact FRET architectures for high-efficiency energy transfer.
• • The pc-FRET system exhibits a wide Stokes shift of ~320 nm, allowing non-invasive photo-controllable color modulation from blue to red with high spectral resolution.
• • Photo-triggered trans-to-cis isomerization of azobenzene induces reversible structural transitions in vesicle diameter and thickness, providing dynamic control over FRET efficiency and color output.
• • Multichromatic 2D QR codes fabricated via patterning lithography demonstrate multimodal decryption and repeatable performance, offering a robust platform for high-level information encryption.