Bistable liquid crystal device with optical writing or optical erasing function and preparation method thereof
A bistable liquid crystal, optical writing technology, applied in instruments, optics, nonlinear optics, etc., can solve problems such as difficult control and complex process, and achieve the effects of simple processing, simple synthesis, and precise control
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Embodiment 1
[0048] Example 1: Electrical writing, optical erasing
[0049] The composite system of chiral spiroene compound (right-handed) / R811 (right-handed) / nematic liquid crystal SLC1717 is blended according to the ratio of 1.00 / 5.30 / 93.70 to modulate the light-responsive cholesteric liquid crystal composite system. Such as image 3 As shown, in the excitation light (365nm, 10.0mW / cm 2 ) Under irradiation, the pitch of the light-responsive cholesteric liquid crystal is from p 0 = 1.1μm becomes p 1 =7.8μm; when the excitation light is turned off, the pitch changes from p 1 =7.8μm back to p 0 = 1.1 μm. First, the liquid crystal composite system is poured into a liquid crystal cell with a cell thickness of 20μm. The liquid crystal is in a planar texture, showing a transparent selective reflection state, and the visible light transmittance is about 95% ( Pic 4-1 ). Applying an electric field to the circular area where information needs to be written, the arrangement of the liquid crystal mol...
Embodiment 2
[0052] Example 2: Electrical writing, optical erasing
[0053] The chiral spiro ene compound (left-handed) / S811 (left-handed) / nanoparticle NaYF 4 The composite system of Yb,Er / nematic liquid crystal E7 is blended according to the ratio of 1.60 / 4.80 / 0.90 / 92.70 to modulate the light-responsive cholesteric liquid crystal composite system. In the excitation light (975nm, 200.0W / cm 2 ) Under irradiation, nanoparticle NaYF 4 : Yb, Er will emit in-situ excited ultraviolet light, and the light response of the cholesteric liquid crystal has a pitch from p 0 =0.7μm becomes p 1 =3.7μm; when the excitation light is turned off, the pitch changes from p 1 =3.7μm back to p 0 =0.7μm. First, the liquid crystal composite system is poured into a liquid crystal cell with a cell thickness of 70 μm. The liquid crystal is in a planar texture, showing a transparent selective reflection state, and the visible light transmittance is about 94%. An electric field is applied to the circular area where inform...
Embodiment 3
[0056] Example 3: Optical writing, electrical erasing
[0057] The composite system of chiral spiroene compound (right-handed) / R811 (right-handed) / nematic liquid crystal SLC1717 was blended according to the ratio of 1.40 / 5.10 / 93.50 to modulate the light-responsive cholesteric liquid crystal composite system. In the excitation light (400nm, 30.0mW / cm 2 ) Under irradiation, the pitch of the light-responsive cholesteric liquid crystal is from p 0 =1.0μm becomes p 1 =9.4μm; when the excitation light is turned off, the pitch changes from p 1 =9.4μm back to p 0 =1.0μm. The liquid crystal composite system is first poured into a liquid crystal cell with a cell thickness of 2μm, and then an electric field is applied to the liquid crystal cell to make the liquid crystal molecules arranged into a focal conic state, showing a light scattering state, with a transmittance of about 12% ( Figure 6-1 ). Then use excitation light (400nm, 30.0mW / cm 2 ) Irradiate the triangular area where informati...
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