Scattering-/absorption-mode light shutters based on dye-doped fingerprint chiral textures

Cheng, Wei-Hsiang; Lai, Jyun Cong; Jie, Sharon Tan Fang; Liu, Cheng-Kai

doi:10.1016/j.dyepig.2018.11.033

Cited by 10 publications

(2 citation statements)

References 15 publications

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“…At E = 1 V/μm, the Grandjean planar texture collapsed into the FC texture and the whole active surface was covered by the FC state, as can be seen in Figure 6 a. Strong light scattering was produced (only 30% of the incident light could cross the sample) ( Figure 6 c), accompanied by the disorder of the helical structure and distortion of the PBG, as shown in Figure 6 b [ 40 ]. As a result, no laser emission was produced in this case ( Figure 7 ).…”

Section: Resultsmentioning

confidence: 99%

Electrically Tunable Two-Color Cholesteric Laser

Saadaoui,

Yang,

Wang

et al. 2023

Polymers

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Two-color lasing emission from an asymmetric structure, consisting of two dye-doped cholesteric liquid crystal (DD-CLC) layers separated by a transparent interlayer, is demonstrated. The DD-CLC mixtures have different reflection bands with long-wavelength band edges located at the green and red wavelengths of the visible spectrum, respectively. For the laser action, the CLC hosts provide the feedback, and the fluorescent laser dyes represent the active medium. When the stacked structure is optically pumped above the threshold, two simultaneous laser lines separated by 123 nm are observed at the long-wavelength band edges of the DD-CLC mixtures. The influence of an electric field on lasing behavior is also analyzed and discussed in terms of the reflection spectrum and laser action. The results show a reversible tuning of the reflection band, accompanied by a modification of the lasing characteristics under the application of an external field. Above a specific threshold voltage, one of the emission lines is suppressed and the other is conserved. With a further increase in the voltage, both laser emissions are entirely inhibited. The investigated structure demonstrates a simple technique to obtain an electrically tunable multi-wavelength laser, which might pave the way for a new generation of organic laser sources.

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Section: Resultsmentioning

confidence: 99%

Electrically Tunable Two-Color Cholesteric Laser

Saadaoui,

Yang,

Wang

et al. 2023

Polymers

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“…A liquid crystal (LC) is an ideal medium for developing CPL materials with high g lum due to the self-assembly of LC molecules. − Combining Förster resonance energy transfer (FRET) with self-assembly of LCs could significantly enhance g lum and tune the emission color of CPL materials. ,− For example, a recently reported CPL material is constituted of luminescent cholesteric LCs as chiral donors and achiral long-wavelength aggregation-induced emission (AIE) fluorophores as well-assembled acceptors . In this system, the chiral transport channel of circularly polarized fluorescence resonance energy transfer (C-FRET) is highly dependent on cholesteric and energy resonances in the highly intrinsic chiral LC assembly.…”

Section: Introductionmentioning

confidence: 99%

Regulating Circularly Polarized Luminescent Behavior of Luminescent Liquid Crystalline Polymers through Resonance Energy Transfer

et al. 2023

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Circularly polarized luminescent materials show significant application in display devices, optical instruments, bionic fields, etc. In this work, we design and prepare a chiral luminescent liquid crystalline polymer, namely, poly(4,4',4″-tricholesterylformate-oxytetraphenylethylene-methyl acrylic acid ester) (P1). Polarizing optical microscopy (POM) and X-ray diffraction (XRD) results indicate that this polymer forms a hexagonal columnar phase. Circularly polarized luminescence (CPL) experiment shows that no CPL signal is observed for the polymer in the bulk, but the polymer mixed with a small amount of 4-cyano-4′-pentylbiphenyl (5CB) (P1@5CB) presents a strong CPL signal with a luminescence asymmetry factor (g lum) of +0.18. Further, Förster resonance energy transfer (FRET) is adopted to regulate the CPL using P1 as energy/chiral donors and the achiral long-wavelength Nile red (NR) dyes as acceptors. The resultant compound shows a bathochromically shifted emission by up to 160 nm compared with P1@5CB and also emits an efficient CPL with a g lum of +0.20. This result demonstrates that the controllable regulation of efficient CPL with an efficient glum is realized through nonradiative resonance energy transfer and chiral transfer.

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Phototuning Energy Transfer in Self‐Organized Luminescent Helical Superstructures for Photonic Applications

Lin

Sun

Qiao

et al. 2020

Advanced Optical Materials

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Stimuli‐triggered changes in the emission color of functional materials are in demand for a variety of potential applications. Herein, a strategy to reversibly phototune fluorescence color in cholesteric liquid crystal (CLC) with self‐organized luminescent helical superstructure via fluorescence resonance energy transfer (FRET) is developed. This dynamic FRET system is constructed by doping with 1,2‐dithienyldicyanoethene‐based chiral fluorescent photoswitch (switch 7) as an acceptor and a conventional coumarin dye C6 as a donor into a nematic liquid crystal (LC) host. The efficient energy transfer from C6 to switch 7 in the LC media, which is evidenced by both of emission color shift and enhanced circularly polarized luminescence, can be modulated on the basis of reversible trans–cis photoisomerization of switch 7 upon visible/UV light irradiations, leading to the emission color change from orange to green. Noteworthily, the FRET efficiency can be significantly improved when CLCs are confined in the polymer microtubes. Preliminary demonstrations of the LC film and LC microtubes array for information display and encryption with ease of electrical operation between planar, homeotropic, and focal conic states or light manipulation are described.

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Scattering-/absorption-mode light shutters based on dye-doped fingerprint chiral textures

Cited by 10 publications

References 15 publications

Electrically Tunable Two-Color Cholesteric Laser

Electrically Tunable Two-Color Cholesteric Laser

Regulating Circularly Polarized Luminescent Behavior of Luminescent Liquid Crystalline Polymers through Resonance Energy Transfer

Phototuning Energy Transfer in Self‐Organized Luminescent Helical Superstructures for Photonic Applications

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