Journal
ACS APPLIED MATERIALS & INTERFACES
Volume 12, Issue 50, Pages 56604-56614Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acsami.0c17241
Keywords
circularly polarized luminescence; chiral luminescence liquid crystal; self-assembly; stimuli-responsive circularly polarized luminescence; cholesteric liquid crystal
Funding
- National Natural Science Foundation of China [52003229, 21704086]
- Research Foundation of Education Bureau of Hunan Province, China [19C1784]
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Considerable luminescence dissymmetry factor (g(lum)) is vital for application implementation of circularly polarized luminescence (CPL) materials. Moreover, a dual CPL switch has promising prospects in high-security encryption and sensor devices. Herein, we designed and synthesized an emissive chiral nematic liquid crystal (N*-LC) by doping a luminescent chiral additive (NO2-CS-C6-Chol) into a nematic liquid crystal (5CB). The helical assembly structure produced by inducing the formation of N*-LC endows the prepared emissive N*-LC with a larger g(lum) value. With the increase of the doping concentration from 1 to 10 wt %, the helical pitch (P) of N*-LC gradually decreases from 25.48 to 3.92 mu m. The corresponding gun, value increases first, reaches the maximum value (-0.38) at 6 wt %, and then decreases slightly. Further, the prepared emissive N*-LC doped with 6 wt % NO2-CS-C-6-Chol is injected into an indium-tin oxide (ITO)-coated LC cell, to which a direct current (DC) electric field is applied. The g(lum) value can be repeatedly shuttled between the on and off state by adjusting the applied voltage. Meanwhile, owing to the inherent thermal dependence of the liquid crystal phase structure, the g(lum) value can also be switched between the on and off state by regulating the temperature. Therefore, an electrically controlled and thermocontrolled dual CPL switching device is successfully constructed.
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