Activating the Chiroptical Properties of High-Fold Axial Chiral Perovskite by a Chiral Induction Strategy.

Chiral perovskites typically exhibit efficient circular dichroism and circularly polarized luminescence, demonstrating promising applications in chiroptical and spintronic devices. However, the relationship between the chiroptical properties and structurally symmetric elements of chiral perovskites has not been established. The unique structure of the high-fold axis may impart distinctive chiral optoelectronic properties, yet it remains unexplored.

3-(Fluoropyrrolidinium)MnCl Perovskite Featuring Strong Third-Order Nonlinear Absorption for Ultralow-Threshold Optical Limiting.

The escalating demand for laser protection in military, industrial, and commercial sectors has intensified the pursuit for advanced optical limiting (OL) materials capable of safeguarding against high-intensity laser threats. Despite the progress, current OL materials are beset with challenges such as low linear transmittance, narrow operational bandwidths, and inadequate response speeds, which hinder their effectiveness in practical applications. In this work, an organometallic hybrid perovskite of 3-(fluoropyrrolidinium)MnCl demonstrated significant reverse saturable absorption properties, with an ultralow starting threshold of 9 mJ/cm and a substantial third-order nonlinear absorption coefficient of 4.

Chiral BN-Heteroacenes Embedded with B←N Coordination: Acid-Triggered Reversible Bond Switching and Optical Limiting Behavior.

Boron-nitrogen coordination (B←N) bonds have emerged as a versatile motif for engineering π-conjugated systems with tunable optoelectronic properties. Herein, we report the synthesis, structures, and properties of chiral heteroacenes (-) featuring B←N coordination within highly twisted π-frameworks. - were synthesized via a four-step approach, where the final cyclization simultaneously forged six- and five-membered rings bearing both B-N covalent and B←N dative bonds.

Irradiation-Resistant Two-Dimensional WN as Efficient Saturable Absorbers: Implications for Space Use.

Space exploration is inseparable from advanced antiradiation materials with exceptional properties. Among these, nonlinear optical materials and devices, such as irradiation-resistant saturable absorbers (SAs), have garnered significant attention, particularly due to their critical role in integrated photonics for space use. This study presents a comprehensive evaluation of the space adaptability of two-dimensional (2D) WN under simulated space radiation conditions.

First Chiral Catalan Solid Based on Molybdenum Halide with Efficient Circularly Polarized Luminescence in the Deep-Red Region.

The design of novel chiral metal halides with exceptional chiroptical properties has attracted significant research attention due to their potential applications in chiral optoelectronics and spintronics. However, developing the deep-red circularly polarized luminescence (CPL) emitters is still challenging. In this work, we presented the first chiral molybdenum halide clusters by incorporating chiral methylbenzylammonium (R/S-MBA) for the design of (R-MBA)MoCl and (S-MBA)MoCl tetrakis hexahedra, which adopt the unique Catalan solid structure.

Valence state engineering in multi-heteroatom-doped PAHs: a strategy for tunable photophysical properties and phototheranostic potentials.

Precise modulation of the electronic structures in heteroatom-doped polycyclic aromatic hydrocarbons (hetero-PAHs) is essential for advancing organic optoelectronic materials. Herein, we report a facile synthetic strategy for hetero-PAHs co-doped with N, O, and S/Se, achieved acid-catalyzed Pictet-Spengler reactions and thermally induced -substitution. Systematic π-extension results in a large redshift in optical absorption/emission and enhances fluorescence quantum yield ( ) from 4.

Magnetic Organic-Inorganic Hybrid Halide Perovskites: Fundamental Physics, Properties, and Applications.

Magnetic materials are pivotal in spintronics, where the electron's spin is harnessed for information processing, potentially leading to faster and more efficient devices. Among the promising materials in this domain are magnetic organic-inorganic hybrid halide perovskites, which effectively bridge the realms of magnetism and multifunctional applications. This review provides a comprehensive overview of these materials, covering their fundamental physical principles, diverse properties, and potential applications in spintronics and other emerging fields.

Synergistic Effect of Cation and Anion Passivation Defects and Suppression of Phase Transition Enhance the Performance and Stability of Inverted Perovskite Solar Cells.

The trap states and phase instability of perovskite films harm the fabrication of high-performance and stable perovskite solar cells (PSCs). Herein, the β-fluorophenylethanammonium cation (β-FPEA) and tosylate anions (TsO) are employed to enhance both the performance and stability of inverted PSCs. Theoretical calculations show that β-FPEATsO can passivate the defects at both FA-I and Pb-I terminals.

"Two-in-One" DPP Building Blocks for Ambipolar Conjugated Polymers in Flexible Transistors.

Advancements in conjugated donor-acceptor (D-A) polymers with superior semiconducting performance and reliability are pivotal to the evolution of flexible electronics. However, the development of electron-accepting building blocks has lagged far behind that of electron-donating ones, hindering the progression of ambipolar and n-type semiconductor polymers-especially ambipolar types-and thereby limiting the construction of logic circuits and p-n heterojunctions. In this study, we introduce a new electron-accepting building block, , meticulously engineered for semiconducting polymers tailored to flexible electronics applications.

Highly Efficient Narrowband Circularly Polarized Luminescence from Discrete Supramolecular Aggregates.

Achieving narrowband emission, high efficiency, and circularly polarized luminescence (CPL) in organic light-emitting diodes (OLEDs) remains a significant challenge. In this study, a discrete supramolecular dimerization strategy is presented to overcome this limitation. By incorporating a helical arylamine with a sterically demanding configuration into a multi-resonance narrowband emitter, the formation of a unique dimeric structure in the solid state is enabled.

Recent Progress in Dimerized Small-Molecular Acceptors for Organic Solar Cells.

Organic solar cells (OSCs) have witnessed significant advancements in recent years, largely propelled by innovations in material design and device engineering. Among the emerging materials, dimerized small-molecule acceptors (DSMAs) have garnered considerable attention due to their unique advantages. For instance, DSMAs can directly inherit the excellent optoelectronic properties of corresponding small-molecule monomers.

Through-Space Interactions Enable Aggregation-Induced Quenching Suppression and Spin-Flipping Enhancement of Carbonyl-Nitrogen-Based Multiple Resonance Thermally Activated Delayed Fluorescence Emitters.

Multiple resonance (MR) thermally activated delayed fluorescence (TADF) materials hold significant potential for applications in high color purity and highly efficient organic light-emitting diodes (OLEDs). However, their inherently large planar structures often result in severe aggregation-induced quenching and slow spin-flip processes, presenting significant challenges that limit their practical applications. In this study, we designed and synthesized two MR-TADF molecules, tCON-Cz and tCON-2tBuCz, by incorporating a tCON backbone with carbazole or 3,6-di--butylcarbazole at the ortho position of the phenyl ring.

A Fused Diketopyrrolopyrrole Derivative for Single-Crystal Visible-NIR Organic Phototransistor.

Organic phototransistors (OPTs) have garnered significant attention due to their potential in wearable and flexible electronics. However, achieving high carrier mobility and broadband response in organic semiconductors for OPTs remains a challenge. In this work, a new fused diketopyrrolopyrrole (FDPP) derivative is reported, 2,9-bis(4-hexylphenyl)-7H,14H-thieno[3',2':7,8]indolizino[2,1-a]thieno[3,2-g]indolizine-7,14-dione (FDPP-p-C6), synthesized through N-cyclization of DPP with an adjacent thiophene unit.

Interlayer confinement toward short hydrogen bond network construction for fast hydroxide transport.

Driven by boosting demands for sustainable energy, highly conductive hydroxide exchange membranes (HEMs) are urgently required in electrochemical conversion devices. The hydrogen bonds shorter than 2.5 angstrom are expected to accelerate the ion transport.

Chiral europium halides with high-performance magnetic field tunable red circularly polarized luminescence at room temperature.

Chiral organic-inorganic hybrid metal halides as promising circularly polarized luminescence (CPL) emitter candidates hold great potential for high-definition displays and future spin-optoelectronics. The recent challenge lies primarily in developing high-performance red CPL emitters. Here, coupling the f-f transition characteristics of trivalent europium ions (Eu) with chirality, we construct the chiral Eu-based halides, (R/S-3BrMBA)EuCl, which exhibit strong and predictable red emission with large photoluminescence quantum yield (59.

Against the Wallach's Rule Through Rational Design of Metal-Free Chiral Perovskites Toward Efficient Red Circularly Polarized Phosphorescence.

The potential applications of circularly polarized phosphorescent materials in chiroptical devices have attracted considerable interest. Nevertheless, the design of efficient near-infrared/red circularly polarized phosphorescent pure organic materials remains a significant challenge, largely due to the limitations imposed by the energy-gap law and Wallach's rule. In this study, the chiral metal-free perovskite strategy is employed to overcome these restrictions.

Twist and Shine: Ultra-Narrow Red Emission from Nitrogen and Oxygen Co-Doped Hetero-Nanographenes.

Nanographenes, known for their exceptional optoelectronic properties, have garnered significant interest for their tunable electronic structures, particularly through heteroatom doping. Herein, we report the synthesis of two twisted hetero-nanographenes (h-NGs) co-doped with nitrogen and oxygen via a three-step strategy, where the tandem Pictet-Spengler cyclization and ipso-aromatic substitution serve as a key step. Both h-NGs incorporate a unique bis-fused diazacoronene (BFDAC) core, with one further extending the π-system via peri-fusion of four benzopyran units.

Synergistic Molecular Engineering of Fully Non-fused Ring Acceptors for Achieving Efficient Zigzag Charge Transport Channel and Low Non-Radiative Voltage Loss.

Fully non-fused ring acceptor (FNFRA) are potentially important for boosting the performance and lowering the material costs of organic solar cells (OSCs). Despite their potential, FNFRA-based OSCs have not yet matched the performance of their fused ring and partial non-fused ring counterparts due to limited molecular engineering research. In this work, by incorporating a synergistic strategy of tailoring the β-side chain and end-group of FNFRA with the cyclic "belt" simultaneously, a FNFRA named C6FT-2F2Cl is constructed.

Navigating the transitional window for organic semiconductor single crystals towards practical integration: from materials, crystallization, and technologies to real-world applications.

Organic semiconductor single crystals (OSSCs), which possess the inherent merits of long-range order, low defect density, high mobility, structural tunability and good flexibility, have garnered significant attention in the organic optoelectronic community. Past decades have witnessed the explosive growth of OSSCs. Despite numerous conceptual demonstrations, OSSCs remain in the early stages of implementation for applications that require high integration and multifunctionality.

Chiral Metal-Free Anti-Perovskite with Strong Chiroptical Nonlinearity.

The nonlinear chiroptical properties of chiral metal halide perovskite has attracted substantial attention in recent years. In order to overcome the inherent limitations of metal halide, such as high costs, potential toxicity, challenges with recycling, especially the limited laser-induced damage threshold (LDT), we have successfully constructed the first chiral metal-free anti-perovskite, with the aim of utilizing it in second harmonic generation-circular dichroism (SHG-CD). Moreover, the anti-perovskite composed entirely of small organic ions typically display a more extensive transparent window, which could contribute a high LDT.

Improving electron injection of organic light-emitting transistors interface layer design.

Ambipolar transport is crucial for constructing high performance organic light-emitting transistors (OLETs), but the ambipolar feature is usually not exhibited due to ineffective electron injection especially in symmetric device geometry. Herein, we show that electron injection could be greatly enhanced through the judicious design of an organic interface layer of 3,7-di(2-naphthyl)dibenzothiophene ,-dioxide (DNaDBSO) which shows an interfacial dipole effect upon contact with a metal electrode, especially an Au electrode. When incorporating a DNaDBSO film beneath Au electrodes, the electron injection and mobility were significantly enhanced in 2,6-diphenylanthracene-based OLETs, and thus ambipolar transport (maxh: 2.

Strong Magneto-Chiroptical Effects through Introducing Chiral Transition-Metal Complex Cations to Lead Halide.

The interplay between chirality with magnetism can break both the space and time inversion symmetry and have wide applications in information storage, photodetectors, multiferroics and spintronics. Herein, we report the chiral transition-metal complex cation-based lead halide, R-CDPB and S-CDPB. In contrast with the traditional chiral metal halides with organic cations, a novel strategy for chirality transfer from the transition-metal complex cation to the lead halide framework is developed.

Mechanochromic Organic Micro-Laser.

This work presents the first demonstration of a mechanochromic organic micro-laser, which exhibits remarkable wide range pressure sensing characteristics. The gain material, pinacolato boronate ester functionalized anthanthrene (AnBPin), is designed by incorporating mechanofluorochromic (MFC) properties into organic laser dye. The AnBPin exhibits a reversible transition between green and orange fluorescence upon grinding annealing and recrystallization cycle, and its micro-crystal exhibits typical organic micro-laser behaviors.

Boosting the Photoresponse of Azobenzene Single-Molecule Junctions via Mechanical Interlock and Dynamic Anchor.

As the most classic photoisomerization system, azobenzene has been widely utilized as a building unit in various photoswitching applications. However, attempts to build azobenzene-based single-molecule photoswitches have met with limited success, giving low on/off ratios. Herein, we demonstrate two designs of azobenzene-based photoresponsive single-molecule junctions, based on mechanically interlocked diazocine and azobenzene-based dynamic anchors, respectively.