Strong CPL of achiral AIE-active dyes induced by supramolecular self-assembly in chiral nematic liquid crystals (AIE-N*-LCs)

Li, Xiaojing; Hu, Wenrui; Wang, Yuxiang; Quan, Yiwu; Cheng, Yixiang

doi:10.1039/c9cc01678c

Cited by 126 publications

(76 citation statements)

References 54 publications

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“…Aggregation‐induced emission (AIE) is a phenomenon that the luminogens which are non‐emissive at a molecular state, are induced to show strong emission under aggregation. The aggregation induced CPL (AICPL) of the AIEgens has been well investigated. However, the CPL of segregated AIEgens was rarely reported .…”

Section: Methodsmentioning

confidence: 99%

Emerging Cubic Chirality in γCD‐MOF for Fabricating Circularly Polarized Luminescent Crystalline Materials and the Size Effect

Shang

et al. 2020

Angew Chem Int Ed

126

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The chiral feature of γCD‐MOF, and especially the emergent cubic void, was not unveiled so far. Now, through the host–guest interaction between γCD‐MOF and achiral luminophores with different charges and sizes, the unique cubic chirality of the emerging void in γCD‐MOF as well as a size effect on CPL induction are revealed for the first time. Numerous achiral luminophores could be integrated into γCD‐MOF and emitted significantly boosted circularly polarized luminescence. While the small sized luminophores preferred to be loaded into the intrinsic void of γCD, large ones were selectively encapsulated into the cubic void. Interestingly, when the size of the guest luminophores was close to the cube size, it showed strong negative CPL. Otherwise, either positive or negative CPL was induced.

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Section: Methodsmentioning

confidence: 99%

Emerging Cubic Chirality in γCD‐MOF for Fabricating Circularly Polarized Luminescent Crystalline Materials and the Size Effect

Shang

et al. 2020

Angew Chem Int Ed

126

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“…It is worth noting here that significant enhancement of g lum could be observed occasionally in nano-assemblies or in aggregated systems as a result of the formation of chiral microstructural materials or films (Geng et al, 2003 ; Kumar et al, 2015 ; Roose et al, 2016 ; Sang et al, 2019 ), in particular for few electroluminescent systems, such as OLEDs (Brandt et al, 2016 ; Song F. et al, 2018 ). In addition, the incorporation of emissive moieties into anisotropic media, such as chiral liquid crystals displaying helical macrostructures, proved to be an efficient strategy for the generation of strong CPL emission (Watanabe and Akagi, 2014 ; Goto, 2018 ; Gao et al, 2019 ; Kim et al, 2019 ; Li et al, 2019 ; Yang X. et al, 2019 ). Focusing on isotropic solutions, some recent up-converted CPL studies evidenced enhanced g lum compared to their downshifted counterparts.…”

Section: Physical Basis Of Cpl and Strategies To Achieve Strong Cpl Ementioning

confidence: 99%

Beyond Chiral Organic (p-Block) Chromophores for Circularly Polarized Luminescence: The Success of d-Block and f-Block Chiral Complexes

2020

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Chiral molecules are essential for the development of advanced technological applications in spintronic and photonic. The best systems should produce large circularly polarized luminescence (CPL) as estimated by their dissymmetry factor ( g lum ), which can reach the maximum values of −2 ≤ g lum ≤ 2 when either pure right- or left-handed polarized light is emitted after standard excitation. For matching this requirement, theoretical considerations indicate that optical transitions with large magnetic and weak electric transition dipole moments represent the holy grail of CPL. Because of their detrimental strong and allowed electric dipole transitions, popular chiral emissive organic molecules display generally moderate dissymmetry factors (10 −5 ≤ g lum ≤ 10 −3 ). However, recent efforts in this field show that g lum can be significantly enhanced when the chiral organic activators are part of chiral supramolecular assemblies or of liquid crystalline materials. At the other extreme, chiral Eu III - and Sm III -based complexes, which possess intra-shell parity-forbidden electric but allowed magnetic dipole transitions, have yielded the largest dissymmetry factor reported so far with g lum ~ 1.38. Consequently, 4f-based metal complexes with strong CPL are currently the best candidates for potential technological applications. They however suffer from the need for highly pure samples and from considerable production costs. In this context, chiral earth-abundant and cheap d-block metal complexes benefit from a renewed interest according that their CPL signal can be optimized despite the larger covalency displayed by d-block cations compared with 4f-block analogs. This essay thus aims at providing a minimum overview of the theoretical aspects rationalizing circularly polarized luminescence and their exploitation for the design of chiral emissive metal complexes with strong CPL. Beyond the corroboration that f–f transitions are ideal candidates for generating large dissymmetry factors, a special attention is focused on the recent attempts to use chiral Cr III -based complexes that reach values of g lum up to 0.2. This could pave the way for replacing high-cost rare earths with cheap transition metals for CPL applications.

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“…But so far there have been very few works on CPL‐active N*‐LCs materials. [ 33–35 ] Recently, Ikai's group reported that the helical supramolecular polymers were assembled as a cholesteric liquid crystal, strong chiral amplification effect, and intense CPL signal ( g em = 1.0 × 10 −2 ) were observed while adding infinitesimal achiral dyes into cholesteric LC to form N*‐LCs. [ 36 ] In 2019, Duan and co‐workers explored a new pathway to develop the novel CPL‐active LC material by dispersing chiral emitters and a triplet donor into N‐LCs, the g em of N*‐LCs could be amplified one order of magnitude up to about 0.04 through remarkable photon upconverted circularly polarized luminescence (UC‐CPL) mechanism.…”

Section: Methodsmentioning

confidence: 99%

Strong‐Induced CPL Emission Promoted from Achiral Conjugated Polymer‐Containing Emissive Nematic Liquid Crystals (P‐N*‐LCs)

Chen

et al. 2020

Macromol. Rapid Commun.

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With the rapid development on 3D printing technology, more and more works have been devoted to 3D display. 3D display will really come true by using circularly polarized luminescence (CPL)‐active materials with both high quantum yield and dissymmetry factor (gem) in organic light‐emitting diode or liquid crystals (LCs). But so far most of these CPL materials cannot meet the real application requirement because of the low gem values in the range of 10−5–10−2. In this paper, ternary chiral emissive LCs (P‐N*‐LCs) is designed by doping chiral binaphthyl‐based enantiomers as chiral dopant (Guest 1) and achiral conjugated polymer as induced CPL emitter (Guest 2) into nematic liquid crystal (N‐LCs) Host 5CB. Both Guest 1 and Guest 2 show excellent compatibility with Host 5CB. The obtained ternary P‐N*‐LCs can emit strong‐induced CPL signal with gem up to 1.12 and ФFL up to 66.1%. This work first develops a new strategy for the smart design of excellent CPL materials from versatile achiral conjugation fluorescence polymers.

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Strong CPL of achiral AIE-active dyes induced by supramolecular self-assembly in chiral nematic liquid crystals (AIE-N*-LCs)

Abstract: AIE-N-LCs prepared by supramolecular self-assembly between achiral AIE-active dyes and N-LCs can exhibit highly strong CPL signals with gem values in the range from 0.97 to 1.42. Most importantly, their emission wavelength can be tuned by changing the AIE-active dye.

Cited by 126 publications

References 54 publications

Emerging Cubic Chirality in γCD‐MOF for Fabricating Circularly Polarized Luminescent Crystalline Materials and the Size Effect

Emerging Cubic Chirality in γCD‐MOF for Fabricating Circularly Polarized Luminescent Crystalline Materials and the Size Effect

Beyond Chiral Organic (p-Block) Chromophores for Circularly Polarized Luminescence: The Success of d-Block and f-Block Chiral Complexes

Strong‐Induced CPL Emission Promoted from Achiral Conjugated Polymer‐Containing Emissive Nematic Liquid Crystals (P‐N*‐LCs)

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Strong CPL of achiral AIE-active dyes induced by supramolecular self-assembly in chiral nematic liquid crystals (AIE-N*-LCs)

Abstract: AIE-N*-LCs prepared by supramolecular self-assembly between achiral AIE-active dyes and N*-LCs can exhibit highly strong CPL signals with gem values in the range from 0.97 to 1.42. Most importantly, their emission wavelength can be tuned by changing the AIE-active dye.

Cited by 126 publications

References 54 publications

Emerging Cubic Chirality in γCD‐MOF for Fabricating Circularly Polarized Luminescent Crystalline Materials and the Size Effect

Emerging Cubic Chirality in γCD‐MOF for Fabricating Circularly Polarized Luminescent Crystalline Materials and the Size Effect

Beyond Chiral Organic (p-Block) Chromophores for Circularly Polarized Luminescence: The Success of d-Block and f-Block Chiral Complexes

Strong‐Induced CPL Emission Promoted from Achiral Conjugated Polymer‐Containing Emissive Nematic Liquid Crystals (P‐N*‐LCs)

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Abstract: AIE-N-LCs prepared by supramolecular self-assembly between achiral AIE-active dyes and N-LCs can exhibit highly strong CPL signals with gem values in the range from 0.97 to 1.42. Most importantly, their emission wavelength can be tuned by changing the AIE-active dye.