Chiral Blue TADF Materials Enhance the Spin Transitions to Improve Emission Quantum Yield

Nano Letters, Journal Year: 2025, Volume and Issue: unknown

Published: Feb. 12, 2025

Circularly polarized thermally activated delayed fluorescence materials not only possess high exciton utilization efficiency but also have the capability to emit circularly light for potential information storage and sensing. In this work, chiral blue TADF enantiomers are prepared. The energy difference between singlet triplet, ΔEST, increases with strength of chirality. orbit-induced spin degeneracy elimination could enhance relaxation, where flip easily lead an effective transition from triplet states. This induces a pronounced enhancement in quantum yield. Furthermore, emission under different external magnetic fields studied. Magnetic field control glum presents mirror symmetry effect enantiomers, which provides evidence photon electron spin.

Language: Английский

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Two 3D Rare-Earth Double Perovskite Materials Constructed with a Pair of Enantiomers

ACS Applied Materials & Interfaces, Journal Year: 2025, Volume and Issue: unknown

Published: Feb. 6, 2025

Organic-inorganic hybrid chiral small-molecule materials combine the inherent properties of both components; however, studies integrating chirality with rare-earth double-perovskite are limited. In this work, we synthesized two enantiomers three-dimensional (3D) double-perovskites, [R-3-HDMP]2CsEu(NO3)6 (1) and [S-3-HDMP]2CsEu(NO3)6 (2), by reacting R-3-HDMP S-3-HDMP (where 3-HDMP = 3-hydroxy-N,N-dimethylpyrrole) CsNO3 Eu(NO3)3 in a 2:1:1 ratio within an acidic solution. Both R-3-HDMPI S-3-HDMPI crystallize space group P212121 at room temperature, exhibiting transition from SHG-on to SHG-off (SHG second harmonic generation) upon heating cooling. The temperature-dependent X-ray single-crystal diffraction analysis carried out on compound 1 2, before after phase transition, disclosed transformation their groups noncentrosymmetric centrosymmetric. Additionally, incorporation elements as B-site cations imparts exceptional fluorescence compounds. These effectively merge unique characteristics molecules luminescence structures, paving way for innovative optical devices advanced information processing technologies.

Language: Английский

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Hierarchical Chirality Transfer and Amplification within Conjugated Helical Polymers for Efficient Circularly Polarized Organic Light-Emitting Diodes and Photodetectors

ACS Applied Materials & Interfaces, Journal Year: 2025, Volume and Issue: unknown

Published: April 7, 2025

Circularly polarized organic light-emitting diodes (CP-OLEDs) and CP photodetectors have received enormous attention owing to their promising potential in light-related technologies. The simultaneous construction of efficient CP-OLEDs using the multifunctionality same chiral material remains be explored. Herein, achiral conjugated polymer poly(9,9-dioctylfluorene) (PFO) is used for coassembly with helical polyacetylenes. resulting emitters can achieve high-performance circularly electroluminescence (CPEL) a large dissymmetry factor (gEL) 0.11 high brightness 9035 cd m-2. By introducing flexible substrate into device, are realized. Additionally, such serve as photoactive layer photodetector detect light, maximum photocurrent (gph) order 10-1. This work provides route realize factors polyfluorene polymer, facilitating comprehensive versatile development.

Language: Английский

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Circularly Polarized Luminescence in Achiral Tin-Based Perovskites via Structural Isomer-Driven Coordination Interaction

The Journal of Physical Chemistry Letters, Journal Year: 2025, Volume and Issue: unknown, P. 4181 - 4188

Published: April 18, 2025

A chiral bidentate ligand, (R)-(-)-1-amino-2-propanol (denoted as R1) or (R)-(-)-2-amino-1-propanol R2), was used to modify achiral 2D tin-based perovskite HDASnBr4 (HDA: 1,6-hexamethylenediamine) form R1-HDASnBr4 R2-HDASnBr4 by an acid precipitation method. exhibits a near-unity photoluminescence quantum yield (PLQY) and strong yellow circularly polarized luminescence (CPL) with asymmetry g-factor (|glum|) of 8.3 × 10-3, while shows PLQY 95% |glum| 3.2 10-3. Both exhibit CPL activities, attributed the significant centro-asymmetric distortion induced interaction between ligand inorganic lattice perovskites. The is 2.6× that R2-HDASnBr4, resulting from direct coordination hydroxyl group attached carbons in R1 [SnBr6]4- framework, which induces higher degree than amino R2. Furthermore, we explored potential inducer source facilitate asymmetric polymerization. This work offers simple strategy introduce chirality

Language: Английский

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Why Mixed Halides in 2D Chiral Perovskites Weaken Chirality-Induced Spin Selectivity

ACS Nano, Journal Year: 2024, Volume and Issue: unknown

Published: Dec. 18, 2024

2D Ruddlesden-Popper (RP) perovskites, upon inclusion of a chiral amine, exhibit chirality-induced spin selectivity (CISS). Although alloying at the halogen site in MBA-based RPs (MBA: methylbenzylammonium) is one suitable routes to tune CISS effect, mixed-halide RP perovskites exhibited complete suppression chirality when probed through circular dichroism (CD). Here, we present effect series perovskites. We show that photoinduced halide segregation origin for apparent suppression. The spin-dependent charge transport was evidenced magnetic-conducting atomic force microscopy (mc-AFM) studies and magnetoresistance (MR) measurements. mc-AFM results (

Language: Английский

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A Self-Powered Circularly Polarized Light Photodetector with High Responsivity Based on the Chiral Quasi-2D Perovskite Film

ACS Applied Materials & Interfaces, Journal Year: 2024, Volume and Issue: unknown

Published: Dec. 31, 2024

Low-dimensional hybrid organic-inorganic perovskites (HOIPs) containing chiral organic ligands have recently emerged as promising candidates for circularly polarized light (CPL) detection, which can distinguish left- and right-handed CPL directly. However, the increase in responsivity realization of self-powered photodetector remain a challenge. Meanwhile, there is trade-off between photocurrent ability to differentially absorb detectors based on these low-dimensional perovskites. Herein, we report quasi-2D perovskite films (S/R-MBA)

Language: Английский

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Near-infrared circularly polarized luminescence enabled by chiral inorganic nanomaterials

Nanoscale, Journal Year: 2024, Volume and Issue: unknown

Published: Nov. 30, 2024

Near-infrared circularly polarized luminescence (NIR-CPL) has attracted widespread attention owing to its fascinating characteristic-circular polarization in specific illumination regions-offering advances applications such as information security and cancer detection. For the generation of NIR-CPL, chiral inorganic nanomaterials have emerged desirable candidates due their extraordinary chiroptical properties. In this mini-review, we first highlight recent NIR-CPL produced from nanomaterials. Thereafter, present Finally, prospect challenges field provide new perspectives insights for development novel materials applications.

Language: Английский

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Circularly Polarized Photodetectors Based on Chiral Moiré Stacking Films of Electrospun ZnO Nanowires

ACS Applied Nano Materials, Journal Year: 2024, Volume and Issue: unknown

Published: Dec. 18, 2024

Chiral semiconductors, with their distinct photoelectric responses to left- and right-handed circularly polarized light (CPL), are emerging as promising candidates for chiroptical sensing applications. This trend underscores the need develop films tunable handedness. In this study, we report preparation of parallel-aligned ZnO nanowires (NWs) through oriented electrospinning subsequent pyrolysis precursor NWs. Moiré stacking were created by NWs a controlled left-/right-handed rotation angle between successive layers. The film structural parameters circular dichroism (CD) spectra optimized. CPL photodetectors developed using these NW hybridization CsPbBr3 perovskite. photodetector performance was investigated focus on responsivity (R), photodetectivity (D*), photocurrent asymmetry factor (gIph). Furthermore, discussion optoelectronic mechanisms intrinsic devices conducted, shedding potential advanced photodetection

Language: Английский

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