Circularly polarized luminescence of lanthanide complexes: From isolated individuals, discrete oligomers, to hierarchical assemblies

InfoMat, Journal Year: 2022, Volume and Issue: 5(3)

Published: Dec. 26, 2022

Abstract Circularly polarized luminescence (CPL) is the emission featured spatial orientation equivalent to circular dichroism. Owning unique magnetic dipole‐allowed but electric‐dipole‐forbidden 4 f → transitions, chiral lanthanide complexes have been recognized as ideal candidates achieve unprecedented dissymmetry factor ( g lum ). Their inherent transition can be partly allowed, through rational design of coordination ligands lower surrounding symmetry, further endowing them with relatively high quantum yields (QYs). Moreover, blossom supramolecular chemistry in allows for construction discrete oligomers and hierarchical assemblies, rendering enhanced chiroptical activities. Here, we deploy this review by summarizing recent advances properties complexes, spanning multiple scales from isolated mononuclear individuals, polynuclear oligomers, infinite assemblies. We first introduce basic concept several important parameters assessment CPL activity. Then, coordinated different types antennas, along chirality transfer induction achiral were discussed. Next, systematical discussion on assemblies was presented. Meanwhile, state‐of‐the‐art applications CPL‐active revisited. end up conclusion prospects, involving ligands, directed hierarchically precise self‐assembly, extending complexes. image

Language: Английский

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Bi‐Chiral Nanostructures Featuring Dynamic Optical Rotatory Dispersion for Polychromatic Light Multiplexing

Advanced Materials, Journal Year: 2023, Volume and Issue: 35(33)

Published: May 10, 2023

Abstract Chiral nanostructures featuring the unique optical activity have attracted broad interests from scientists. The typical polarization rotation of transmitted light is usually wavelength dependent, namely rotatory dispersion. However, its dynamic tunability and intriguing collaboration with other degrees freedom, especially highly desired spatial phase, remain elusive. Herein, a bi‐chiral liquid crystalline nanostructure proposed to induce an effect called reflective Thanks independent manipulation opposite‐handed self‐assembled helices, spin‐decoupled geometric phases are induced simultaneously. These naturally unite multi‐dimensions versatile stimuli‐responsiveness soft matter. Dynamic holography driven by heat electric field demonstrated fast response. For polychromatic light, hybrid multiplexed holographic painting exhibited fruitful tunable colors. This study extends ingenious construction chiral superstructures, presents open‐ended strategy for on‐demand control, enlightens advanced applications display, computing, communication.

Language: Английский

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Enhancing Circularly Polarized Luminescence in Quantum Dots through Chiral Coordination-Mediated Growth at the Liquid/Liquid Interface

Journal of the American Chemical Society, Journal Year: 2023, Volume and Issue: 145(44), P. 24375 - 24385

Published: Oct. 26, 2023

Here, we develop a novel methodology for synthesizing chiral CdSe@ZnS quantum dots (QDs) with enhanced circularly polarized luminescence (CPL) by incorporating l-/d-histidine (l-/d-His) ligands during ZnS shell growth at the water/oil interface. The resulting QDs exhibit exceptional absolute photoluminescence yield of up to 67.2%, surpassing reported limits 40.0% inorganic QDs, along absorption dissymmetry factor (|gabs|) and (|glum|) values 10-2, exceeding range 10-5-10-3 10-4-10-2, respectively. Detailed investigations synthetic pathway reveal that interface, as binary environment, facilitates coordinated ligand exchange mediated His-Zn2+ coordination complexes, leading maximum fluorescent brightness chiroptical activities. process, regulated complex, not only reduces trap states on CdSe surface, thereby enhancing fluorescence intensity, but also significantly promotes orbital hybridization between ligands, effectively overcoming shielding effect wide bandgap imparting pronounced chirality. proposed elucidates origin chirality provides insights into regulation CPL intensity in QDs. Furthermore, application multilevel anticounterfeiting systems overcomes limitations replication achiral materials enhances system's resistance counterfeiting, thus opening new opportunities optical intelligent information encryption.

Language: Английский

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Circularly Polarized Room-Temperature Phosphorescence with an Ultrahigh Dissymmetry Factor from Carbonized Polymer Dots by Stacked Chiral Photonic Films

ACS Applied Materials & Interfaces, Journal Year: 2023, Volume and Issue: 15(21), P. 26037 - 26046

Published: May 17, 2023

Developing circularly polarized room-temperature phosphorescent (CPRTP) materials with a high dissymmetry factor (glum) and long afterglow is very attractive but highly challenging. Here, CPRTP emission featuring ultrahigh glum value desired visualization characteristic in bilayer composite photonic film achieved for the first time. In constructed system, N P co-doped carbonized polymer dots (NP-CPDs) are dispersed into polyvinyl alcohol (PVA) as emitting layer, helically structured cholesteric films used selective reflective layers to convert unpolarized of NP-CPDs emission. On basis modulation helical structure period polymer, enables obtain value. Notably, optimized emits 1.09 green lasting above 8.0 s. Moreover, array information encryption characteristics developed by modulating liquid crystal phase dot coating position NP-CPDs/PVA thus expanding application cryptography anti-counterfeiting.

Language: Английский

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Tunable circular polarization room temperature phosphorescence with ultrahigh dissymmetric factor by cholesteric liquid crystal elastomers

Cell Reports Physical Science, Journal Year: 2023, Volume and Issue: 4(10), P. 101583 - 101583

Published: Sept. 15, 2023

It is highly demanded that organic functional materials can generate strong and switchable circularly polarized room temperature phosphorescence (CPRTP) be developed. Here, we report a simple effective strategy to achieve mechanical-tunable CPRTP with high luminescence dissymmetric factors (glum) by doping bulky phosphorescent guest, tetra-N-phenylbenzidine (TPB), into reconfigurable cholesteric liquid crystal elastomers (CLCEs). The amount of chain extender plays vital role in determining the lifetime mechanical properties constructed CLCE composite films. Both experimental theoretical results reveal TPB compensates for insufficient rigidity CLCEs, resulting long-afterglow CPRTP. Moreover, glum tuned from 0.93 near zero stretching CLCEs. Combining CLCEs' network remarkable CPRTP, 4D encryption luminescent barcode established, exhibiting great potential information storage these distinct materials.

Language: Английский

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