Fluorescent Trimeric Liquid Crystals: Modular Design of Emissive Mesogens

Sentman, Alan C.; Gin, Douglas L.

doi:10.1002/1521-4095(200109)13:18<1398::aid-adma1398>3.0.co;2-j

Cited by 45 publications

(18 citation statements)

References 6 publications

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“…Here we introduced fluorescence into characteristic banana phases, opening the way to take advantage of their promising photophysical properties for device applications. [27][28][29] The result was achieved by the judicious choice of the bent central core and the substituents, including an appropriate structure with intramolecular H-bonding, which is not only intrinsically fluorescent but also exhibits the fluid smectic PSM (B7) phase.…”

Section: Molecular Design Considerationsmentioning

confidence: 99%

Fluorescence Confocal Polarizing Microscopy of a Fluorescent Bent‐Core Liquid Crystal Exhibiting Polarization Splay Modulated (B7) Structures and Defects

et al. 2014

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The B7 phases of bent-core molecules are polarization splay modulated fluid smectics that exhibit an unusually complex variety of exotic macroscopic structures, textures, and defects visible in polarized light microscopy. Herein we describe optical studies of these structures using fluorescence confocal polarizing microscopy (FCPM) and depolarized transmission optical microscopy to probe their organization in three dimensions. These experiments utilize recently reported fluorescent bent-core molecules designed to give strong polarized fluorescence. This new bent-core molecular family provides the means for probing a variety of bent-core phases and structures by using FCPM and multiphoton fluorescence nonlinear imaging techniques. Comparative textural analysis of the B7 structures obtained using different types of imaging and the corresponding structural models are discussed.

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Section: Molecular Design Considerationsmentioning

confidence: 99%

Fluorescence Confocal Polarizing Microscopy of a Fluorescent Bent‐Core Liquid Crystal Exhibiting Polarization Splay Modulated (B7) Structures and Defects

et al. 2014

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“…The availability of near-ultraviolet-emitting diodes facilitates the development of emissive liquid crystal displays [4,5]. Several studies focused on fluorescent (or luminescent) liquid crystals [6][7][8][9][10][11][12][13][14], but only few metalcontaining luminescent liquid crystal systems have been described [15][16][17][18][19][20][21][22]. Luminescent liquid-crystalline materials can also be used to generate polarized emission [23,24].…”

Section: Introductionmentioning

confidence: 99%

Near-infrared luminescence emitted by an electrically switched liquid crystal cell

Driesen

Moors

Beeckman

et al. 2007

Journal of Luminescence

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Switching of near-infrared emission was observed for liquid crystal (LC) cells filled with a chiral nematic liquid-crystal mixture (mixture of E7 and cholesteryl nonanoate) doped with luminescent neodymium(III) or ytterbium(III) b-diketonate complexes. The operating principle of the LC cell is based on an electrically induced phase transition from a chiral nematic to a nematic phase. The chiral nematic phase scatters the excitation light more strongly, resulting in more efficient light absorption and intenser photoluminescence. r

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“…A number of differing molecular architectures is possible for liquid crystal trimers; for example, linear [4][5][6][7][8][9][10][11][12][13][14][15][16][17][18], terminally/laterally connected [19][20][21], cyclic [22,23], tribranched/star-shaped [24][25][26][27][28][29][30] and mixed calamitic/discotic trimers [19,31,32].…”

Section: Introductionmentioning

confidence: 99%

Oligomeric liquid crystals: From monomers to trimers

2004

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A homologous series of linear liquid crystal trimers, the 4,4'-bis[v-(4-methoxyazobenzene-4'-yloxy)alkoxy]azobenzenes, has been synthesized and characterized. The transitional properties of the trimers are compared with those of the corresponding series of dimers, the a,v-bis(4-methoxyazobenzene-4'-oxy)alkanes, and monomers, the 4-methoxy-4'-alkoxyazobenzenes. Characteristically pronounced odd-even effects were seen for the transitional properties of both dimers and trimers on varying the spacer lengths. The clearing temperatures of the trimers were higher than those of the corresponding dimers, but as the length of the flexible spacers was increased this difference became rather small. The ratios of T NI , and DS NI /R for monomer:dimer and dimer:trimer are discussed. These are very similar to reported values for similar materials, suggesting that there may be a rather general relationship between the transitional properties of liquid crystal oligomers as the number of mesogenic units is increased.

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Fluorescent Trimeric Liquid Crystals: Modular Design of Emissive Mesogens

Cited by 45 publications

References 6 publications

Fluorescence Confocal Polarizing Microscopy of a Fluorescent Bent‐Core Liquid Crystal Exhibiting Polarization Splay Modulated (B7) Structures and Defects

Fluorescence Confocal Polarizing Microscopy of a Fluorescent Bent‐Core Liquid Crystal Exhibiting Polarization Splay Modulated (B7) Structures and Defects

Near-infrared luminescence emitted by an electrically switched liquid crystal cell

Oligomeric liquid crystals: From monomers to trimers

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