Brightening up Full-Color and White Circularly Polarized Luminescence through Chiral Induction and Circularly Polarized Light Excitation

Yang, Hongfang; Ma, Shuo; Zhao, Biao

doi:10.1021/acsami.3c01145

Cited by 19 publications

(21 citation statements)

References 62 publications

(88 reference statements)

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“…The dynamic chirality inversion of these coassemblies can be also achieved by tuning the assembling temperature, since the assembly pathways are highly dependent on the temperature and play important roles in the supramolecular chirality regulation of the resultant assemblies. , As shown in Figure S37, the CD spectra of PVPCC/Zn(NO 3 ) 2 /dyes showed obviously negative CD absorptions with broad shoulder peaks (corresponding to the UV absorption of the doping dyes) at 298 K, indicating the effective chirality transfer in the resultant aggregates. By contrast, negative CD peaks below 400 nm (assigned to the CD absorption of PVPCC/Zn(NO 3 ) 2 aggregates) and inwardly convergent curves above 400 nm (assigned to the CD absorption of the dye-based aggregates) were observed in the aggregates of PVPCC/Zn(NO 3 ) 2 /dyes at 273 K. − The result suggested that the different dye stacking occurred in the aggregates processed at different assembling temperature. This temperature-directed aggregation of dyes was clearly demonstrated by the CPL investigation.…”

Section: Resultsmentioning

confidence: 95%

Full-Color Circularly Polarized Luminescence of Supramolecular Polymers with Handedness Inversion Regulated by Anion and Temperature

Fu,

Liu

2024

ACS Nano

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Constructing full-color circularly polarized luminescence (CPL) materials with switchable handedness in the solid state is an appealing yet considerably challenging task, especially for supramolecular polymer films assembled from homochiral monomers. Herein, supramolecular polymers with full-color CPL and inverted handedness are realized through the coassembly of a homochiral cholesterol derivative (PVPCC), metal ions (Zn 2+ ), and achiral fluorescent dyes. The obtained coassembled systems show anion-directed supramolecular chirality inversion by exchanging the anions of NO 3 − , ClO 4 − , BF 4 − , and Cl − . For instance, the negative CD and right-handed CPL are detected in the PVPCC/Zn(NO 3 ) 2 aggregates, which convert into positive CD and left-handed CPL after introducing Cl − , corresponding to the transformation from nanorods to nanofibers. Furthermore, the tunable CPL color and handedness inversion of the coassembly system of PVPCC/Zn(NO 3 ) 2 and achiral fluorescent dyes can be established by alternately changing the assembling temperature of 298 and 273 K. Importantly, the full-color CPL polymeric materials are then constructed by doping the PVPCC/Zn(NO 3 ) 2 /dyes complexes into poly(methyl methacrylate) (PMMA) film, which maintains the handedness inversion and shows the enhanced CPL performance. The work not only deepens the understanding of chirality inversion in supramolecular chemistry but also helps to construct full-color CPL materials with switchable handedness from homochiral building blocks in materials science.

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Section: Resultsmentioning

confidence: 95%

Full-Color Circularly Polarized Luminescence of Supramolecular Polymers with Handedness Inversion Regulated by Anion and Temperature

Fu,

Liu

2024

ACS Nano

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“…4 To more clearly demonstrate the CPF-ET process, recently, we obtained full-color and white CPL by taking advantage of circularly polarized light excitation (CP-Ex) as well as chiral induction strategy. 29 In the presence of a PMMA matrix, through intermolecular π−π stacking interactions, the chirality of α-pinene was transferred to racemic helical polyacetylene (PMY), resulting in the formation of chiral solid film (Figure 8a). Then, four achiral fluorophores were introduced into the chiral films to fabricate CPL-active blend films.…”

Section: Circularly Polarized Fluorescence Energy Transfermentioning

confidence: 99%

“Matching Rule” for Generation, Modulation and Amplification of Circularly Polarized Luminescence

Zhong,

Gao,

Zhao

et al. 2024

Acc. Chem. Res.

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Metrics & MoreArticle Recommendations CONSPECTUS: Circularly polarized luminescence (CPL) generated by chiral luminescent systems has sparked enormous attention in multidisciplinary field as it brings infinite potential for applications, such as 3D optical displays, biological probes, and chiroptical sensors. Satisfying both the conditions of chirality and luminescence (including fluorescence or phosphorescence) is a prerequisite for constructing CPL materials. In this regard, whether in organic, inorganic, or hybrid systems, chiral and luminescent components generally involve effective coupling through covalent or noncovalent bonds. For covalent interactions, such as the copolymerization of chiral and luminescent monomers, although covalent bonds provide high stability for the system, they inevitably involve tedious preparation procedures that connect chirality and luminescence together. For noncovalent bonds, take supramolecular assembly as an example, chiral elements and achiral lightemitting units are chiral transferred through intermolecular interactions, and their advantages include the diversity of luminescent and chiral building blocks, the stimuli responsiveness brought by noncovalent bonds, as well as the potential amplification of CPL signals by coassembly. However, the stability of the assembly system may be poor, and the assembly chiroptical performance and morphology are difficult to predict. Gratifyingly, matching rule that do not rely on covalent together with noncovalent interactions allows for the effortless construction, modulation, as well as amplification of CPL systems.In this Account, we overview different strategies based on matching rule, including fluorescence-selective absorption, circularly polarized reflection, and circularly polarized fluorescence energy transfer (CPF-ET). Examples of these strategies are illustrated with a focus on helical polymers in light of their appealing structures and wide uses. For instance, for fluorescence-selective absorption, chiral helical polymers can convert racemic fluorescence light into a circularly polarized one with specific handedness by simply overlapping the helical polymer's circular dichroism (CD) spectra with the luminophore's emission spectra. For circularly polarized reflection, employing the selective reflection of certain handedness's circularly polarized light, the high helical twisting power (HTP) of the helical polymer in the cholesteric liquid crystals (N*-LCs) gives the system high g lum . Additionally, for CPF-ET, only the emission spectrum of the donor and the absorption (or excitation) spectrum of the achiral acceptor are required to overlap, and no covalent or noncovalent interactions between the two are required. An outlook for the CPL materials related to matching rule which will avail the optimization and extension of this intriguing approach concludes the Account. We hope that the Account will offer insightful inspiration for the flourishing progress of chiroptical systems and present exciting opportunities.

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“…A series of CPL materials were obtained using this method, including metal complexes, , organic small molecules, − π-conjugated polymers, − and so forth. In addition, CPL materials can also be obtained by introducing chiral dopants or chiral environment into achiral luminescent materials through physical doping method. − Regardless of the method used to prepare CPL materials, the chiral arrangement of chromophores is the key to achieving CPL.…”

Section: Introductionmentioning

confidence: 99%

General Strategy to Prepare Nondoped Circularly Polarized Luminescent Liquid Crystal Materials with Tunable Performance

Huang,

Wen,

Wang

et al. 2024

ACS Appl. Mater. Interfaces

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Chiral luminescent liquid crystals have attracted widespread attention from researchers due to their unique advantages in constructing circularly polarized luminescent (CPL) materials with large luminescent asymmetry factor (g lum) values. However, how to effectively prepare nondoped CPL chiral liquid crystals remains a challenge. In this article, we developed an effective and universal method to prepare nondoped CPL chiral liquid crystal materials. To achieve our strategy, we copolymerized chiral monomer M0Mt with α-cyanostilbene-based luminescent monomers MmPVPCN (m = 6, 8, 10) bearing different flexible spacer lengths to obtain a series of CPL chiral liquid crystal copolymers poly(MmPVPCN(x)-co-M0Mt(y)). Under the induction of the chiral component, the α-cyanostilbene component assembles to form chiral liquid crystals. Meanwhile, α-cyanostilbene also exhibits aggregation-induced emission enhancement characteristics. Therefore, with the help of the selective reflection effect of chiral liquid crystals, the copolymer films can emit efficient CPL. For poly(M8PVPCN(0.85)-co-M0Mt(0.15)), the g lum and solid luminescence quantum yield can achieve −2.61 × 10–2 and 25.04%, respectively. In addition, by altering the chemical structure of the copolymers, the phase structure of the copolymers can be effectively controlled, thereby regulating their CPL properties.

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Brightening up Full-Color and White Circularly Polarized Luminescence through Chiral Induction and Circularly Polarized Light Excitation

Cited by 19 publications

References 62 publications

Full-Color Circularly Polarized Luminescence of Supramolecular Polymers with Handedness Inversion Regulated by Anion and Temperature

Full-Color Circularly Polarized Luminescence of Supramolecular Polymers with Handedness Inversion Regulated by Anion and Temperature

“Matching Rule” for Generation, Modulation and Amplification of Circularly Polarized Luminescence

General Strategy to Prepare Nondoped Circularly Polarized Luminescent Liquid Crystal Materials with Tunable Performance

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