Helical Star-Shaped Bottlebrush Polymers: From Controlled Synthesis to Tunable Photoluminescence and Circularly Polarized Luminescence

ACS Macro Letters, Год журнала: 2024, Номер 13(11), С. 1396 - 1402

Опубликована: Окт. 8, 2024

The controlled synthesis of star-shaped bottlebrush polymers with tunable topologies is a challenge. However, such materials may exhibit distinct photoluminescence properties. Bottlebrush have polymerization-induced emission (PIE) properties due to their aggregated side chains, and aggregation-induced (AIE) also unique luminescent property. In this work, we prepared variety highly active alkyne Pd catalysts polymerized poly(L/D-lactic acid) macromonomers containing polymerizable phenylisocyanide groups as end obtain topologically structured controllable molecular weights narrow weight distributions. tetraphenyl ethylene (TPE) units the core circularly polarized luminescence We propose that are AIE characteristics TPE unit combined PIE polymer.

Язык: Английский

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Organic Circularly Polarized Room‐Temperature Phosphorescence: Strategies, Applications and Challenges

Angewandte Chemie International Edition, Год журнала: 2024, Номер unknown

Опубликована: Ноя. 16, 2024

Abstract Organic circularly polarized luminescence (CPL) plays crucial roles in chemistry and biology for the potential chiral recognition, asymmetric catalysis, 3D displays, biological probes. The long‐lived luminescence, large Stokes shift, unique chiroptical properties make organic room‐temperature phosphorescence (CPP) a new research hotspot recent years. Nevertheless, achieving high‐performance CPP is still challenging due to sensitivity complexity of integrating triplet excitons polarization within materials. This review summarizes latest advances CPP, ranging from design strategies photophysical underlying mechanisms applications. Specifically, generating are systemically categorized discussed according interactions between units chromophores. applications light‐emitting diodes, sensing, afterglow information encryption also illustrated. In addition, we present current challenges perspectives on developing CPP. We expect this provide some instructive principles fabricate materials, offering an in‐depth understanding mechanism paving way toward diverse practical

Язык: Английский

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Inverted and Amplified Circularly Polarized Luminescence Behavior Originated from Structure–Activity Regulation of Achiral Pyrene-Based Polymers in Chiral Coassemblies

Macromolecules, Год журнала: 2024, Номер 57(9), С. 4567 - 4575

Опубликована: Май 2, 2024

The design of excellent circularly polarized luminescence (CPL) materials with a large dissymmetry factor (glum) remains great challenge. In this paper, we chose two achiral conjugated pyrene-based main-chain polymers (BP-1 and BP-2) different substitution positions (1,6-positions the pyrene rings for BP-1 2,7-positions chiral binaphthyl-based inducer (S/R-D) bridged alkyl chain to construct coassemblies through an intermolecular chirality induction mechanism. Interestingly, after thermal annealing treatment, resulting S/R-D-BP-2 could emit inverted amplified CPL signals compared S/R-D-BP-1. Most significantly, maximum |glum| value (S/R-D)0.2-(BP-2)0.8 in spin-coated film was up 0.71 (λem = 428 nm, QY 44.8%) at 220 nm thickness, which about 6-fold that (S/R-D)0.1-(BP-1)0.9 (|glum| 0.12, λem 451 37.6%). glum due formation regular ordered helical nanofibers strong π–π stacking interactions. This work provides creative approach tune emission amplification behaviors by coassembly from polymers.

Язык: Английский

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Photon Upconversion Cooperates with Downshifting in Chiral Systems: Modulation, Amplification, and Applications of Circularly Polarized Luminescence

Angewandte Chemie, Год журнала: 2024, Номер 136(27)

Опубликована: Май 4, 2024

Abstract Circularly polarized luminescence (CPL)‐active materials are increasingly recognized for their potential applications such as 3D imaging, data storage, and optoelectronic devices. Typically, CPL have required high‐energy (HE) photons excitation to emit low‐energy (LE) circularly light, a process known downshifting (DSCPL). However, the emergence of upconverted (UCCPL), where absorption multi LE results in emission single HE photon with circular polarization, has recently attracted considerable attention. This minireview highlights intricate relationship between upconversion phenomena. During upconversion, dissymmetry factor ( g lum ) value can be improved certain systems. Additionally, integration both upconversion‐downshifting‐synergistic systems offers avenues dual‐excitation or dual‐emission functionalities. More detail, emerging UCCPL based on various mechanisms synergy DSCPL introduced. several examples that demonstrate presented highlight future opportunities.

Язык: Английский

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Clustering triggered emissive liquid crystalline template for dual mode upconverted and downconverted circularly polarized luminescence

Nanoscale, Год журнала: 2024, Номер 16(28), С. 13571 - 13579

Опубликована: Янв. 1, 2024

A liquid crystalline system exhibiting clustering triggered emission shows intrinsic downconversion chiral luminescence and acts as a template for the generation of upconversion circularly polarized leading to dual mode emission.

Язык: Английский

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