Glass-Forming Chiral Liquid Crystalline Dimers Based on an Oligo(phenylenevinylene) Unit Exhibiting Circularly Polarized Photoluminescence

2022 ◽  
Author(s):  
Eigo Shimaoka ◽  
Masaki Kunihiro ◽  
Masahiro Funahashi
Keyword(s):  
Liquid Crystalline ◽  
Circularly Polarized ◽  
Glass Forming

scholarly journals Preferential Circularly Polarized Luminescence from a Nano-Segregated Liquid Crystalline Phase Using a Polymerized Twisted Nematic Platform

Polymers ◽  
2020 ◽  
Vol 12 (11) ◽  
pp. 2529
Author(s):  
Jae-Jin Lee ◽  
Suk-Won Choi
Keyword(s):  
Molecular Weight ◽  
Liquid Crystalline ◽  
Guest Molecule ◽  
Mixed System ◽  
Low Molecular Weight ◽  
Circularly Polarized ◽  
Molecular Systems ◽  
Circularly Polarized Luminescence ◽  
Twisted Nematic ◽  
Polarized Luminescence

In this study, a polymerized twisted nematic (TN) network was used as an extrinsic chiral platform to overcome the heterogeneity during spontaneous symmetry breaking in a mixed system comprising an achiral bent-core molecule and rod-like mesogen. The TN platform was prepared by photopolymerizing a reactive mesogen dispersed in a low molecular weight liquid crystal with TN orientation. The use of TN orientation to correct the degeneracy in bent-core molecular systems has been previously reported; however, to the best of our knowledge, this is the first study that uses an extrinsic chiral platform of a polymerized TN network. The heterogeneity in the nano-segregated phase of the achiral mixture was suppressed using the extrinsic TN platform with a twisted angle θ of ≥ |±30°|. When an achiral mixture doped with a luminescent guest molecule was refilled into the extrinsic chiral platform, preferential deracemization with one-handedness occurred, corresponding to the handedness of the TN platform. Therefore, circularly polarized luminescence with a preferential handedness can be achieved using this extrinsic chiral platform.

Reactive Mesogenes: Synthesis and Application in Optoelectronic Devices

2001 ◽  
Vol 709 ◽  
Author(s):  
Peter Strohriegl ◽  
Doris Hanft ◽  
Markus Jandke ◽  
Thomas Pfeuffer
Keyword(s):  
Liquid Crystalline ◽  
Room Temperature ◽  
Polymer Networks ◽  
Optoelectronic Devices ◽  
Chiral Molecules ◽  
Glass Forming ◽  
Writing Beam ◽  
Crystalline Core ◽  
Crosslinked Networks ◽  
The Stability

ABSTRACTReactive mesogenes posess polymerizable groups attached to a rigid, liquid crystalline core. From such molecules, densely crosslinked networks in which the liquid crystalline order is permanentely fixed can be formed by photopolymerization.Our major synthetic goal was the formation of glass forming reactive mesogenes. Such compounds do not crystallize upon cooling but vitrify and form supercooled LC-phases ('LC-glasses'). They exhibit broad LC-phases and enable us to carry out photopolymerization in a broad range of temperatures.We have systematically investigated how the topology of the reactive mesogenes influences the stability of the resulting glasses. Comparing twin molecules with three- and four-armed stars we found that the supercooled LC-phase in the three-armed stars has a stability superior to both twin molecules and four-armed stars. In the three-armed star Triple-4 with a suitable substituent pattern the supercooled LC-phase is stable at room temperature for at least nine months. Doped with suitable chiral molecules the glass forming nematics form cholesteric phases which were used for cholesteric polymer networks and for polarization holograms with one s-and one p-polarized writing beam.Furthermore we have extended our synthetic efforts to reactive mesogenes with three or five conjugated fluorene units as LC-core. After orientation, the mesogenes were photocrosslinked and used as active layer in OLEDs that emit highly polarized blue light.

Circularly Polarized Electroluminescence from Liquid-Crystalline Chiral Polyfluorenes

2000 ◽  
Vol 12 (5) ◽  
pp. 362-365 ◽  
Author(s):  
M. Oda ◽  
H.-G. Nothofer ◽  
G. Lieser ◽  
U. Scherf ◽  
S. C. J. Meskers ◽  
...  
Keyword(s):  
Liquid Crystalline ◽  
Circularly Polarized

Ionic Liquid Crystalline Based on Amino Acid and Gemini Surfactant: Tunable Phase Structure, Circular Polarized Luminescence and Emission Color

2022 ◽  
Author(s):  
Mengjiao Yi ◽  
Ping Qi ◽  
Qi Fan ◽  
Jingcheng Hao
Keyword(s):  
Ionic Liquid ◽  
Liquid Crystalline ◽  
Gemini Surfactant ◽  
Excitation Wavelength ◽  
Circularly Polarized ◽  
Display Devices ◽  
Emission Color ◽  
Circularly Polarized Luminescence ◽  
Polarized Luminescence ◽  
Application Prospects

Circularly polarized luminescence (CPL)-active ionic liquid crystalline (ILC) featuring excitation wavelength-dependent (Ex-De) photoluminescence have latent application prospects in display devices. In addition, materials with tunable CPL responses are quite attractive...

Photoresponsive Glass-Forming Butadiene-Based Chiral Liquid Crystals with Circularly Polarized Photoluminescence

2008 ◽  
Vol 18 (17) ◽  
pp. 2510-2517 ◽  
Author(s):  
Ratheesh K. Vijayaraghavan ◽  
Shibu Abraham ◽  
Haruhisa Akiyama ◽  
Seiichi Furumi ◽  
Nobuyuki Tamaoki ◽  
...  
Keyword(s):  
Liquid Crystals ◽  
Circularly Polarized ◽  
Glass Forming ◽  
Chiral Liquid Crystals
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