Excitation-dependent circularly polarized luminescence triggered by selective excitation of achiral dichroic dyes in cholesterol liquid crystals.

ABSTRACT: Excitation-dependent (ExD) circularly polarized luminescence (CPL) holds great potential for applications in anti-counterfeiting and information encryption due to its low cost, ease of operation, and reversibility. In this study, we propose a strategy to obtain ExD CPL by selective excitation of dyes with distinct dichroism and excitation wavelengths in a chiral liquid crystal (CLC) host. R/S-CLC-PG doped with the green-emitting dye EG (negative dichroism, S _F = -0.31) and red-emitting PTZ (positive dichroism, S _F = 0.15) can emit green CPL (-0.48/0.37 at 530 nm) at 365 nm excitation and inverted red CPL (0.53/-0.53 at 620 nm) at 420 nm excitation. In addition, R/S-CLC-PR doped with PTZ and red-emitting dye ER (negative dichro

SUBMITTER: Li L 

PROVIDER: S-EPMC12529963 | biostudies-literature | 2025 Oct

REPOSITORIES: biostudies-literature