Optically switchable bistable guest–host displays in chiral-azobenzene- and dichroic-dye-doped cholesteric liquid crystals

Lai, Jyun-Cong; Cheng, Wen-Fa; Liu, Cheng-Kai

doi:10.1016/j.dyepig.2018.12.030

Cited by 27 publications

(15 citation statements)

References 22 publications

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“…This type of texture is also found in the cuticle of Plusiotis gloriosa in nature 23 and CLC films upon electric field application 24,25 and also upon photoisomerization of a doped azobenzene derivative. 26,27 Continuous visible light irradiation or thermal back process resulted in merging of scattered small-domain boundaries, leading to the formation of large domains. Simultaneously, the fingerprint texture emerged in several domains (Figure 2e) and finally merged recovering the initial polygonal fingerprint texture (Figure 2f) and HTP of motor 1 recovered to −33 μm −1 at PSS 436nm .…”

Section: ■ Results and Discussionmentioning

confidence: 99%

“…In case of CLC films, the absorbance of the azobenzene derivatives is depending on not only the isomer ratio but also the orientation of molecules. 27 Basically, when the directions of π−π* transition moment of azobenzene and the electric field of the incident light are parallel to each other, molecules show the maximum absorbance. If molecules become tilted from their parallel position, they cannot effectively absorb the light resulting in decrease of the absorption.…”

Section: ■ Results and Discussionmentioning

confidence: 99%

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Molecular Crankshaft Effect Converting Piston-like Molecular Motion to Continuous Rotation of Macro Objects

Mafy

Kim

Thomas

et al. 2019

ACS Appl. Mater. Interfaces

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A molecular system inducing an accumulative unidirectional rotation motion of glass flakes with about 100 μm in size is introduced. The molecular system is a chiral nematic liquid crystal containing a chiral azobenzene derivative which shows a reversible E–Z photoisomerization accompanying a large helical twisting power change. A film of the molecular system shows different texture change paths upon UV and visible light irradiations inducing “E to Z” and “Z to E” photoisomerizations, respectively, of the chiral azobenzene dopant. Namely, a polygonal fingerprint texture inducing the rotation of glass flakes on the film surface was maintained during UV irradiation, while a focal conic texture inducing no rotation of glass flakes emerged during visible light irradiation. As a result, cycles of the alternative irradiation of UV and visible lights afforded many rotations toward a single direction of the glass flakes which can be considered as a continuous conversion of light energy to mechanical work. We may compare the effect of this molecular system converting “back and forth” structural change between E and Z isomers of the chiral azobenzene to a continuous rotational motion of glass flakes with the crankshaft effect converting a piston-like motion to a rotational motion seen in engines in the real world.

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Section: ■ Results and Discussionmentioning

confidence: 99%

Section: ■ Results and Discussionmentioning

confidence: 99%

Molecular Crankshaft Effect Converting Piston-like Molecular Motion to Continuous Rotation of Macro Objects

Mafy

Kim

Thomas

et al. 2019

ACS Appl. Mater. Interfaces

View full text Add to dashboard Cite

show abstract

“…Nematic liquid crystals memorizing the alignment were implemented by incorporating self-assembled hydrogen-bonded fibers into liquid crystals . Cholesteric liquid crystals are also used in memory display devices because of their homeotropic orientation, and these structures remain stable in the zero-field state. , …”

Section: Introductionmentioning

confidence: 99%

“…23 Cholesteric liquid crystals are also used in memory display devices because of their homeotropic orientation, and these structures remain stable in the zero-field state. 24,25 In addition, fluoran dyes, widespread chromogenic substances, are applied to color-memory materials due to the abundant color options, good responses, and reversibility. The chromogenic behavior of fluoran dyes arises from redox reaction-linked electron transfer.…”

Section: Introductionmentioning

confidence: 99%

Multicolor and Multistage Response Electrochromic Color-Memory Wearable Smart Textile and Flexible Display

Wang

Jiang

Cui

et al. 2021

ACS Appl. Mater. Interfaces

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Electrochromic materials have great application in soft displays and devices, but the application of ideal electrochromic textiles still faces challenges owing to the inconvenience of a continuous power supply. Here, electrochromic color-memory microcapsules (ECM-Ms-red, -yellow, and -blue) with a low drive voltage (2.0 V), coloration efficiency (921.6 cm2 C–1), a practical response rate (34.4 s–1), multistage response discoloration, and good color-memory performance (>72 h) and reversibility (≥1000 cycles) are developed. The color-memory performance is controlled by the energy difference of oxidation–reduction reactions. A multicolor and multistage response electrochromic color-memory wearable smart textile and flexible display are developed that are convenient and energy-efficient for application. The design philosophy of color-memory based on controllable energy difference of reactions has great potential application in sensors and smart textiles.

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“…A reversible modulation of such properties can be achieved by irradiating the device with photons of energy sufficient to trigger the reversible dopant photo isomerization process. The most prominent classes of photochromic compounds which have been used successfully in photo-switchable technologies are azobenzenes [18][19][20][21][22] and diarylethenes (DAEs). [20,21] In particular, DAEs show a number of properties which are highly desirable for the design and fabrication of a variety of responsive systems: i) vastly different optical, electrical, and energetic properties between the two, thermally stable, isomers; ii) highly reversible and fatigue…”

mentioning

confidence: 99%

Diarylethenes in Optically Switchable Organic Light‐Emitting Diodes: Direct Investigation of the Reversible Charge Carrier Trapping Process

Cotella

Bonasera

Carnicella

et al. 2021

Advanced Optical Materials

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disrupting technology on the current display market. [5,6] Nevertheless, the scientific community continues to develop new classes of chromophores, [7][8][9][10][11][12][13][14] functional materials, and device architectures to further improve OLEDs performance or extend their application potential, as in visible light communications (VLCs). [15,16] Beside these efforts, there is emerging interest in stimuli-responsive organic devices, which can be controlled remotely by an external trigger, such as light. [17] In organic thin film devices, lightresponsivity can be introduced in the functional layers by embedding a photochromic compound, whose isomers are able to induce a distinct macroscopic effect on the optoelectronic properties of the device. A reversible modulation of such properties can be achieved by irradiating the device with photons of energy sufficient to trigger the reversible dopant photo isomerization process. The most prominent classes of photochromic compounds which have been used successfully in photo-switchable technologies are azobenzenes [18][19][20][21][22] and diarylethenes (DAEs). [20,21] In particular, DAEs show a number of properties which are highly desirable for the design and fabrication of a variety of responsive systems: i) vastly different optical, electrical, and energetic properties between the two, thermally stable, isomers; ii) highly reversible and fatigue

show abstract

Optically switchable bistable guest–host displays in chiral-azobenzene- and dichroic-dye-doped cholesteric liquid crystals

Cited by 27 publications

References 22 publications

Molecular Crankshaft Effect Converting Piston-like Molecular Motion to Continuous Rotation of Macro Objects

Molecular Crankshaft Effect Converting Piston-like Molecular Motion to Continuous Rotation of Macro Objects

Multicolor and Multistage Response Electrochromic Color-Memory Wearable Smart Textile and Flexible Display

Diarylethenes in Optically Switchable Organic Light‐Emitting Diodes: Direct Investigation of the Reversible Charge Carrier Trapping Process

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