Fig. 1: Schematic illustration of phototunable liquid crystal photonic capsules (LCPCs) with full-color circularly polarized luminescence (CPL) and their application in four-dimensional (4D) information encryption.

a Light-driven Förster resonance energy transfer (FRET) processes of different component LCPCs used as building blocks for phototunable full-color CPL. b Principle design of 4D information encryption consisting of fluorescence, time response, full-color and CPL characteristics.