Abstract
The reversible modulation of the handedness of circularly polarized luminescence (CPL) is highly important for anti-counterfeiting, flexible displays, and encrypted transmission applications. A thermochromic cholesteric liquid crystal (CLC) oligomer was prepared and applied for printing colourful patterns. The structural colours of the patterns were sensitive to the temperature. A CLC elastomer (CLCE) film was prepared using this CLC oligomer, which exhibited mechanochromic property with a wide range of structural colour changes. A CPL-active CLCE film was obtained with the addition of a fluorescent dye. The handedness of the CPL was reversibly switched upon uniaxial stretching of the film. This work not only sheds insight into CPL handedness control based on the CLCE system, but also provides possibilities for flexible decorations and displays.
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