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A new method to construct polymer stabilised cholesteric liquid crystal (PSCLC) films with broadband reflection in the near infrared region (NIR) has been proposed which utilises the chiral dopant-loaded mesoporous polystyrene-divinylbenzene (PS-DVB) microspheres. The diffusion time, UV intensity and temperature during polymerisation were investigated to control the diffusion of chiral dopant and the polymerisation process which could affect the non-uniform pitch distribution and thus the reflection bandwidth. The optimised reflection bandwidth was broadened from 300 nm to 860 nm. Potential application fields of broadband reflective films include smart windows for the control of the solar-light irradiation, and military infrared shielding devices.

liquid crystals

Broadband reflection induced by chiral dopant-loaded mesoporous polystyrene-divinylbenzene microspheres via diffusion in polymer stabilised cholesteric liquid crystals