The influence of alkyl lengths on circularly polarized luminescence for non-liquid crystalline binaphthol-based cyanostilbene

Soft Matter ◽  
2021 ◽  
Author(s):  
Tianwen Fan ◽  
Bangyi Zhou ◽  
Hongyu Guo ◽  
Fafu Yang
Keyword(s):  
Liquid Crystalline ◽  
Circularly Polarized ◽  
Alkyl Chains ◽  
Circularly Polarized Luminescence ◽  
Polarized Luminescence ◽  
The Relationship

This work studied the relationship between the alkyl lengths of non-liquid crystalline molecules and their CPL properties, suggesting that shorter alkyl chains resulted in stronger CPL emission.

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.

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...

Tunable Circularly Polarized Luminescence from Molecular Assemblies of Chiral AIEgens

2019 ◽  
Author(s):  
Fengyan Song ◽  
yanhua Cheng ◽  
Qiuming Liu ◽  
Jacky W. Y. Lam ◽  
Fafu Yang ◽  
...  
Keyword(s):  
Liquid Crystalline ◽  
Bragg Reflection ◽  
Helical Structure ◽  
Helical Axis ◽  
Molecular Assemblies ◽  
Isotropic Liquid ◽  
Circularly Polarized ◽  
Chemical Structures ◽  
Circularly Polarized Luminescence ◽  
Polarized Luminescence

<p>Circularly polarized luminescence (CPL) is important to chiral photonic technologies. In the molecular systems, besides their intrinsic chemical structures, the architectures of molecular assemblies at the mesoscopic scale also account for the final macroscopic CPL properties. Herein, tunable CPL responses can be induced through architectural regulation of these molecular assemblies in suspension and solid states. A liquid crystalline assembled system of DPCE-ECh exhibiting smectic C* phase with a high dissymmetry factor (<i>g</i><sub>CD</sub> = -0.20 and <i>g</i><sub>lum</sub> = +0.38) is reported. The intense and apparent CD and CPL of the film stem from the intrinsic helical structure of the molecular assembles with<b> </b>weak<b> </b>contribution of Bragg reflection, where the helical axis is perpendicular to the optical axis and is parallel to the direction of the glass substrate. To the best of our knowledge,<b> </b>this large <i>g</i><sub>lum</sub> factor is very rare for organic compounds even in the assembled state formed by annealing at smectic liquid crystalline temperature. Interestingly, strong CPL signal with <i>g</i><sub>lum</sub> value of +0.18 is still recorded when DPCE-ECh is annealed at chiral isotropic liquid (Iso*) state. On the other hand, DPCE-ACh can form two coexistence phases of chiral hexagonal and smectic liquid-crystalline phases due to intermolecular hydrogen bonding. The non-periodic molecular orientations of DPCE-ACh break itself helical structure to give a weak negtive CPL signal in 10<sup>-3</sup> order. This work thus provides a new insight for developing efficient chiroptical materials in the aggregate state and profound implications in high-performance CPL-based device.</p>

Tunable Circularly Polarized Luminescence from Molecular Assemblies of Chiral AIEgens

2019 ◽  
Author(s):  
Fengyan Song ◽  
yanhua Cheng ◽  
Qiuming Liu ◽  
Jacky W. Y. Lam ◽  
Fafu Yang ◽  
...  
Keyword(s):  
Liquid Crystalline ◽  
Bragg Reflection ◽  
Helical Structure ◽  
Helical Axis ◽  
Molecular Assemblies ◽  
Isotropic Liquid ◽  
Circularly Polarized ◽  
Chemical Structures ◽  
Circularly Polarized Luminescence ◽  
Polarized Luminescence

<p>Circularly polarized luminescence (CPL) is important to chiral photonic technologies. In the molecular systems, besides their intrinsic chemical structures, the architectures of molecular assemblies at the mesoscopic scale also account for the final macroscopic CPL properties. Herein, tunable CPL responses can be induced through architectural regulation of these molecular assemblies in suspension and solid states. A liquid crystalline assembled system of DPCE-ECh exhibiting smectic C* phase with a high dissymmetry factor (<i>g</i><sub>CD</sub> = -0.20 and <i>g</i><sub>lum</sub> = +0.38) is reported. The intense and apparent CD and CPL of the film stem from the intrinsic helical structure of the molecular assembles with<b> </b>weak<b> </b>contribution of Bragg reflection, where the helical axis is perpendicular to the optical axis and is parallel to the direction of the glass substrate. To the best of our knowledge,<b> </b>this large <i>g</i><sub>lum</sub> factor is very rare for organic compounds even in the assembled state formed by annealing at smectic liquid crystalline temperature. Interestingly, strong CPL signal with <i>g</i><sub>lum</sub> value of +0.18 is still recorded when DPCE-ECh is annealed at chiral isotropic liquid (Iso*) state. On the other hand, DPCE-ACh can form two coexistence phases of chiral hexagonal and smectic liquid-crystalline phases due to intermolecular hydrogen bonding. The non-periodic molecular orientations of DPCE-ACh break itself helical structure to give a weak negtive CPL signal in 10<sup>-3</sup> order. This work thus provides a new insight for developing efficient chiroptical materials in the aggregate state and profound implications in high-performance CPL-based device.</p>

Circularly polarized luminescence spectroscopy

1977 ◽  
Vol 77 (6) ◽  
pp. 773-792 ◽  
Author(s):  
Frederick S. Richardson ◽  
James P. Riehl
Keyword(s):  
Luminescence Spectroscopy ◽  
Circularly Polarized ◽  
Circularly Polarized Luminescence ◽  
Polarized Luminescence
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