Full-color liquid crystal device with high reflectivity by photo-electric modulation
In this work,the oblique helicoidal cholesteric(ChOH)device with high reflectivity and full color displaying was obtained by means of photo-electric cooperative regulation.By introducing a left-handed chiral photoswitch(switch 1)into liquid crystal(LC)system,also based on the principle of chiral cancellation of the opposite handedness chiral additive,a chiral agent R811 was used to balance the difference in helical twisted power value before and after Z/E photoisomerization of switch 1,so that the system could reflect circularly polarized light with opposite handedness and the same red-green-blue colors by applying the same electric field intensity before and after light irradiations.On this basis,a double-layer LC cell was constructed,and the cell was subjected to photo-electric stimulation to induce the helical inversion of the upper layer,so that left-and right-handedness ChOH structure could be formed in the double-layer structure.As a result,the reflectance of the system was increased by around 60%in the device structure with full reflection effect.This study provides a new idea for the preparation of full-color electronic paper devices with high reflectivity,and also provides a useful exploration for the application of photoswitch materials in LC devices.
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维普
