Dual Circularly Polarized Luminescence with Controllable Polarizations in a Single Cholesteric Liquid Crystal

Achieving polarization controllable multicolor CPL remains a significant challenge. In this study, we presented a method for fabricating dual CPL materials with controllable polarizations by doping achiral dyes with distinguishable emission wavelengths and different linear dichroism properties into cholesteric liquid crystals (CLCs). R/S-CLC-1 doped with green-emitting dye PTZ (positive dichroism, SF = 0.33) and red-emitting dye NP (negative dichroism, SF = −0.09) can emit green and red CPL with opposite polarizations (glum = +0.54/–0.52 at 550 nm and −0.35/+0.36 at 645 nm) simultaneously. Conversely, R/S-CLC-2 doped with PTZ and another red-emitting dye PP (positive dichroism, SF = +0.58) can emit green and red CPL in the same polarization (glum = +0.48/–0.43 at 550 nm and +0.68/–0.68 at 645 nm). This approach enables enhanced information encryption capacity and anticounterfeiting by allowing a single CLC pixel to simultaneously store data from two channels.