Browse Articles

Durable Interphase Engineering on SiO <i> _x </i> Anodes Through Interfacial‐Enrichment‐Facilitated Polymerization

ABSTRACT Constructing a robust solid electrolyte interphase (SEI) is a proven strategy to enhance the performance of Si‐based anodes by accommodating severe volume swings and suppressing interfacial side reactions. However, existing strategies that rely solely on either chemical coating or electrochemical formation struggle to reconcile SEI uniformity and long‐term stability. Here, we propose a synergistic strategy that integrates the interfacial modification with in situ regulated electrolyte decomposition. A conformal layer composed of LiF and Li 3 PO 4 is pre‐formed on SiO x anodes, where LiF serves as a stable mechanical framework for the inorganic‐rich SEI, and Li 3 PO 4 selectively adsorbs fluoroethylene carbonate (FEC), favoring the polymerization of FEC‐derived species via interfacial enrichment to form the high‐molecular‐weight organic species. These electrochemically generated SEI components effectively compensate for the damage to the initial coating caused by volume expansion, enabling the SEI to possess both structural integrity and resilience. Consequently, the modified SiO x anode exhibits benchmark electrochemical performance, delivering excellent cycling stability (1086 mA h g −1 , 81% capacity retention for 300 cycles at 0.8 A g −1 ) and high‐rate capability (1010 mAh g −1 at 2.4 A g −1 ). This work establishes a precedent for the dynamic repair interphase design paradigm for high‐capacity anodes.

Region- and Layer-Specific Glutamatergic Synapse Development in the Nascent Cortical Hierarchy

Neocortical synapses are highly dynamic during brain development, undergoing formation, elimination, and maturation before acquiring properties that support adult cognition. Individual neocortical regions develop at different ages, and individual layers within these regions contain distinct neuronal subtypes that process unique patterns of local and long-range synaptic input. To better understand the development of the cortical hierarchy, we explored the laminar maturation of glutamatergic synapses across cortical regions of male and female mice. Synapse maturation was associated with the upregulation of the postsynaptic density protein PSD95. This maturation occurred in a region- and layer-specific manner—layers associated with feedforward pathways develop earlier, while layers associated with higher-order circuits develop later. Our findings highlight adolescence as an important period for the cortex-wide maturation of synapses in cortical layer 1, synapses known to receive top–down feedback from higher-order cortices. We propose that this delayed adolescent maturation of top–down input represents a global signature of cortical development and seemingly acts as the final stage of outside–in brain maturation.

Ferroelectric Dipole‐Driven Solid‐Electrolyte Interphase Passivation for High‐Voltage Lithium Metal Batteries

ABSTRACT High‐voltage lithium (Li) metal batteries (LMBs) are regarded as strong candidates for next‐generation high‐specific‐energy storage devices. However, interfacial side reactions (ISRs) (particularly the often‐overlooked chemical corrosion) and Li dendrite lead to severe depletion of active Li and even pose safety hazards, significantly hindering the practical applications of LMBs. Herein, an oxygen‐vacancy‐engineered BaTiO 3 pre‐adsorbed with NO 3 − (BTOVN) layer is integrated onto a polypropylene separator to selectively lower the energy level of target anion via ferroelectric dipoles, thus passivating the anode/electrolyte interface and improving the long‐term storage and cycle stability of LMBs. Combining cryo‐electron microscopy with multi‐scale spectroscopies, we reveal that the ferroelectric BTOVN layer targets NO 3 − to the interface and promotes the reductive decomposition of both NO 3 − and PF 6 − to form a thinner and tougher solid‐electrolyte interphase (SEI) rich in inorganic Li 2 O, Li 3 N, and LiF, which effectively suppresses persistent ISRs and Li dendrite proliferation while enhancing Li + transport kinetics and interfacial stability. As a result, high‐voltage Li metal full cells delivery a substantially enhanced capacity retention of 89.1% after 500 cycles, and remarkably, even after long‐term resting, they maintain exceptionally stable operation. The work provides a novel perspective on precisely engineering SEI chemistry through targeting anionic species into the interphase layer.

Strategic Acceleration of Reverse Intersystem Crossing in Multi‐Resonance TADF Emitters

ABSTRACT Advanced multi‐resonance‐induced thermally activated delayed fluorescence (MR‐TADF) materials offer intrinsically narrowband emissions and excellent luminescent efficiencies, making them promising emitters for next‐generation organic light‐emitting diodes (OLEDs). However, their development remains hindered by slow reverse intersystem crossing (RISC) rates, which cause severe efficiency roll‐off at high luminance and limit their application in high‐performance OLEDs. Here, we propose an effective approach for designing blue MR‐TADF molecules by integrating a crumpled and asymmetric heptagonal dibenzodiazepine building block, rather than conventional planar donors, which not only promotes efficient triplet‐to‐singlet RISC processes but also preserves narrowband emission. The proof‐of‐concept emitter AzBN2 exhibits a bright deep‐blue emission centered at 462 nm with a full‐width at half‐maximum of 19 nm and CIE coordinates of (0.13, 0.067), accompanied by a more than twofold increase in the RISC rate. As a result, TADF OLEDs based on AzBN2 achieved a record maximum external quantum efficiency (EQE) of up to 35.7%. Moreover, ascribed to the improved RISC rates of AzBN2, the device exhibits an extremely low efficiency roll‐off; notably, the EQE remains at 29.8% under a high luminance of 1000 cd m −2 , representing state‐of‐the‐art performance for MR‐TADF OLEDs.

Endogenous Peptide Derived from c-Cbl-Associated Protein Counteracts Its Inhibitory Effect on Enteric Neural Crest Cell Colonization in Hirschsprung Disease

Hirschsprung disease (HSCR) is a congenital malformation characterized by the absence of the enteric nervous system (ENS) in the distal colon, resulting from defective colonization of enteric neural crest cells (ENCCs). The underlying pathogenesis of HSCR remains incompletely understood. Here, we report that c-Cbl-associated protein (CAP), also known as sorbin and SH3 domain-containing protein 1 (SORBS1), is upregulated in the aganglionic colon tissues of children with HSCR. Functional studies revealed that CAP overexpression suppresses ENCC colonization by binding the lipid raft protein flotillin-1 through its sorbin-homology (SoHo) domain, followed by recruitment of the focal adhesion protein vinculin via its SH3 domain. Using mass spectrometry, we identified an endogenous CAP-derived peptide, termed PDCAP, in aganglionic colon tissues. ELISA further revealed reduced PDCAP levels in the diseased colon tissues of HSCR children. Mechanistically, PDCAP exerts a protective role by competing with its precursor protein, CAP, for binding to flotillin-1, thereby reversing CAP-mediated inhibition of ENCC colonization. This protective function was further validated in Cap lsl/lsl ;Nestin-Cre as well as Ednrb −/− mouse models of either sex, where PDCAP promoted ENCC colonization and ENS development. Collectively, our findings establish PDCAP as a functional antagonist of its precursor CAP, providing a rationale for exploring peptide-mediated interventions in HSCR.

Suppressing Electrode Diffusion With a PMMA Metal‐Capture Mesh Enables Stable Conventional Organic Photovoltaics

ABSTRACT Conventional organic photovoltaics (OPVs) often suffer from premature failure because top‐electrode metals diffuse into the organic stack under thermal stress, generating interfacial traps and leakage pathways. Here, we identify severe aging‐driven Ag diffusion as a critical failure pathway in high‐efficiency conventional architectures. To suppress this without compromising charge extraction, we introduce polymethyl methacrylate (PMMA) that self‐assembles into a discontinuous, mesh‐like network on the PDINN layer, functioning as both a physical diffusion barrier and a chemical metal‐capture mesh. Spectroscopic analyses reveal that PMMA carbonyl groups coordinate with Ag through Ag‐O interactions, providing chemical immobilization that complements the physical barrier in blocking thermally activated, concentration‐gradient‐driven migration. Therefore, PMMA‐modified devices deliver a power conversion efficiency (PCE) of 20.2% with markedly enhanced stability: they retain &gt;80% of the initial PCE after 3,574 h under ISOS‐D‐1I shelf storage, show a T 80 of 105 h under ISOS‐D‐2I thermal aging at 85°C, compared with only 10 h for control devices, and retain 70.1% after 94 h under ISOS‐L‐3 conditions (1 sun, 65°C, 50% relative humidity), versus 51.4% for controls. This strategy also improves the thermal stability of Cu‐ and Au‐based devices, establishing a broadly applicable interfacial concept for mitigating electrode‐diffusion‐induced failure in high‐efficiency conventional OPVs.

Manganese Capture‐and‐Release Vesicles for Cancer Immunotherapy

ABSTRACT Manganese activates the stimulator of interferon genes (STING) pathway, and its sequestration by the TssS micropeptide of Yersinia pseudotuberculosis is an immune evasion tactic. Inspired by this, we developed MnCARS , Mn CA pture‐and‐ R elease vesicles with S TING adjuvant MSA‐2, which capture endogenous manganese ions and release them in cancer cells. Constructed from engineered E. Coli outer membrane vesicles (OMVs), the system integrates surface‐displayed TssS to accumulate endogenous Mn 2+ , with a von Hippel–Lindau (VHL) PROTAC degradation motif that triggers Mn 2+ release via ubiquitin‐proteasome‐mediated cleavage of TssS upon cellular uptake, rather than non‐specific degradation by lysosomal proteases. The surface‐anchored STING agonist MSA‐2 synergizes with the released Mn 2+ to potentiate cGAS‐STING activation and reverse the immunosuppressive tumor microenvironment. In vitro, MnCARS enriched Mn 2+ and triggered dendritic cell maturation. In vivo, they elicited antitumor immunity, inhibiting the growth of subcutaneous CT26 tumors and improving survival in an orthotopic pancreatic cancer model. To demonstrate platform versatility and enable tumor targeting, a tumor‐tropic P eptide was inserted in CAR instead of MSA‐2, yielding MnCARP that enables monitoring Mn 2+ release and STING activation with contrast‐enhanced magnetic resonance imaging (MRI). Overall, MnCARs represent a versatile biological nanoplatform to redirect endogenous metal ions for cancer therapy with inherent imaging capabilities.

A Fourier Optoelectronic Synapse with Single‐Wavelength Modulation

ABSTRACT Analyzing spatial frequency domain features is essential for capturing diverse in‐depth features of targets, thereby enhancing the adaptability to unstructured environments for embodied intelligence. Digital approaches suffer from limited efficiency due to frequent data transfer, while neuromorphic ones lack dedicated frequency‐domain processing hardware. Here, we report a Fourier neuromorphic visual (FIVE) system integrating a Fourier optical system and Fourier optoelectronic synapses (FOSs). The FIVE system extracts frequency‐domain cues optically with negligible time latency and computational energy consumption, and these cues are then filtered based on nonlinearity to the light intensity of FOSs. Furthermore, such a FOS device exhibits multilevel memory tunability by light intensity of single‐wavelength. This property enables the implementation of multilayer perceptron for further classification of frequency domain features. The FIVE system achieves a high accuracy of ∼90% in the image noise classification task and outperforms convolutional neural network (CNN)‐based approaches by orders of magnitude in parameter count.

Unconventional Superconductivity in ScIr ₂ Chiral Crystal With a Kagome Lattice

ABSTRACT Materials with a kagome lattice host exotic quantum phenomena driven by the interplay between band topology, spin–orbit coupling, magnetism, and electronic correlations. While the magnetism of kagome materials has been widely investigated, their unconventional superconductivity (SC) remains largely unexplored due to the limited availability of suitable materials. Here, we report evidence of unconventional SC in the family by combining muon‐spin spectroscopy measurements with band‐structure calculations. The parent undergoes a structural phase transition from a high‐ cubic‐ to a low‐ rhombohedral phase, while the Ir kagome layer remains, albeit slightly, distorted. Although the structural transition is suppressed by Si substitution, the superconducting pairing of remains well described by a two‐gap model. Since at least one of the gaps exhibits nodes, this indicates an unconventional SC. Its unconventional nature can be explained by the distinct flat bands occurring near the Fermi level, leading to strong electronic correlations in the family. Moreover, the low‐ phase of exhibits an Ir chiral chain; therefore, it can be classified as a topological chiral crystal. Overall, the unusual properties of the family make it an interesting, albeit rare, system for studying the interplay between unconventional SC, flat bands, and chirality.

Dynamically Activating Inert Ti ⁴⁺ Sites to Redirect the Oxygen Evolution Pathway Toward Practical PEM Water Electrolysis

ABSTRACT Developing highly active and durable non‐iridium electrocatalysts for the acidic oxygen evolution reaction (OER) is critical for scalable proton exchange membrane water electrolyzers (PEMWE). Here, we report an acid‐dissolution inverse‐doping strategy to synthesize Ti‐doped RuO 2 (Ti‐RuO 2 ) with atomic‐level uniformity. This induces compressive lattice strain and a unique 3d–2p–4d orbital hybridization, dynamically activating traditionally inert Ti 4+ sites into highly active centers for direct water molecule activation while lowering the rate‐determining step barrier. Operando spectroscopy and theoretical calculations reveal a cooperative interaction between Ti and Ru sites via a Ti–O–O–Ru bridged intermediate, shifting the mechanism from the conventional adsorbate evolution mechanism (AEM) to a Ti–Ru dual‐site oxide path mechanism (OPM). Furthermore, activated Ti sites optimize interfacial water structure, accelerating proton transfer and suppressing lattice oxygen oxidation, thereby enhancing the catalyst's stability. Consequently, Ti‐RuO 2 achieves an overpotential of 218 mV at 10 mA cm −2 and operates stably for over 800 h. In a practical PEMWE device, it delivers 3 A cm −2 at 1.787 V, exceeding the US DOE 2026 target, and operates over 400 h at 1 A cm −2 with a minimal voltage degradation. This work introduces a promising non‐iridium catalyst and a general strategy for dynamic dopant activation.

Breaking the Energy Storage Trade‐off in Antiferroelectrics via Bi ³⁺ ‐Driven Atomic‐Nanoscale Synergy

ABSTRACT Achieving superior energy storage in antiferroelectric ceramics is limited by a fundamental compromise: realxor behavior comes at the cost of sacrificing polarization strength. This directly leads to a mutually restrictive balance between recoverable energy density ( W rec ) and energy storage efficiency ( η ). To overcome this, we develop a Bi‐induced local bonding modulation strategy in Pb 0.92‐1.5 x Sr 0.08 Bi x Zr 0.49 Sn 0.5 Ti 0.01 O 3 ceramics that simultaneously strengthens the AFE framework and refines polarization response. This approach elevates both the breakdown strength and the AFE‐FE transition field, allowing the material to withstand higher electric fields and release greater stored energy. The optimized composition achieves a record‐high W rec of 15.6 J cm −3 with ∼90% efficiency under 600 kV cm −1 , alongside ultrafast discharge ( t 0.9 ∼64.5 ns) and excellent thermal/frequency stability. Atomic‐scale characterization reveals a coexistence of robust long‐range AFE order and local polar heterogeneity, which collectively smooths the field‐induced transition path and suppresses early breakdown. This work provides a generalizable design principle for dielectric capacitors by strategically decoupling polarization enhancement from relaxor behavior, paving the way for high‐energy, high‐efficiency pulsed‐power systems.

A Metabo‐Reprogramming Niche Remodeling System Halts Osteoarthritis by Restoring the FGF21‐Arginine Axis

ABSTRACT Osteoarthritis (OA), a global leading cause of chronic pain and disability, lacks disease‐modifying osteoarthritis drugs (DMOADs) targeting its core pathogenesis. scRNA‐seq of human OA cartilage showed marked depletion of a high‐arginine‐metabolism chondrocyte subpopulation driving cartilage degeneration, with its key upstream regulator FGF21, significantly downregulated in OA cartilage. Mechanistically, FGF21 rescues IL‐1β‐induced chondrocyte dysfunction via ASS1/ASL ‐mediated arginine biosynthesis, an effect abrogated by ASS1 knockdown, confirming the FGF21‐arginine pathway's role and FGF21 as a therapeutic target. Guided by this mechanism, we engineered a hydrogel‐based bioinspired metabo‐reprogramming niche remodeling system (MetaRemod) to achieve precise and efficient delivery of FGF21 to OA chondrocytes. In a mouse OA model, MetaRemod effectively halted OA progression by sustaining targeted delivery of bioactive FGF21, restoring chondrocyte arginine metabolism, preserving cartilage structure and joint space, restoring subchondral bone integrity, and mitigating synovitis. Critically, scRNA‐seq of treated cartilage confirmed the restoration of the depleted “high‐arginine‐metabolism” chondrocyte subpopulation, directly validating that MetaRemod reverses OA's core metabolic defect. This study establishes the FGF21‐arginine metabolic axis as a key therapeutic target for OA and validates MetaRemod as a promising strategy that synergizes targeted FGF21 delivery and metabolic reprogramming, laying a solid foundation for the clinical translation of metabolic reprogramming‐based DMOADs.

Highly Crystallized Transparent Composite for Cooperative Imaging

ABSTRACT Highly crystallized glass composites rarely retain high optical transparency while supporting efficient near‐infrared (NIR) emission and strong x‐ray response. Here, a highly crystallized Cr 3+ ‐doped transparent glass composite is reported that breaks this conventional compromise, delivering an optical transmittance exceeding 80% and a near‐unity internal quantum efficiency of 98.5%. Under x‐ray excitation, the glass composite exhibits a radioluminescence (RL) intensity five times that of Bi 4 Ge 3 O 12 and shows thermally enhanced RL, reaching 105% of its room‐temperature intensity at 150°C. This functionality is further extended to fiber form, where NIR glass composite fibers are realized. High‐resolution x‐ray imaging is achieved with a spatial resolution of 27 lp mm −1 , while integration of optical and x‐ray excitation pathways further enables cooperative dual‐modal imaging with complementary contrast and enhanced information depth. These results demonstrate a viable strategy for integrating optical transparency, NIR emission and x‐ray response within a single material platform, supporting advanced photonic and imaging applications.

Bio‐Inspired Gating‐Controlled Electronic Skin for Ultrafast Liquid Recognition and Precise Droplet Sliding Sensing in Robotic Intelligence

ABSTRACT Endowing intelligent robots with the ability to perceive and analyze complex liquid environments is essential for autonomous decision‐making. However, conventional liquid‐sensing technologies remain constrained by a fundamental trade‐off between transient response and recognition accuracy, a limitation stemming from the sluggish kinetics of interfacial charge transfer and complex analytical procedures. Herein, we present a bionic liquid‐sensing electronic skin (BLSE) inspired by the gating‐controlled signal transduction mechanism of ion channels on the surface of biological sensory cells. By emulating the transient signal transduction of ion channels, BLSE achieves instantaneous reconstruction of electronic pathways triggered by the contact between low‐impedance droplets and the high‐impedance sensing array. This design enables an ultrafast response and recovery time of 1.8 ms. To ensure stability in complex liquid environments, a superhydrophobic coating with a contact angle of 159° is integrated, minimizing interfacial adhesion to allow instantaneous functional recovery and stable cyclic sensing. By coupling a multi‐layer interlaced electrode network with deep learning algorithms for multi‐channel feature extraction, BLSE demonstrates a liquid recognition accuracy of 99.58% and the ability to precisely detect droplet sliding. This gating‐inspired sensing paradigm offers a versatile strategy for liquid recognition, paving the way for developing intelligent autonomous systems capable of human‐like environmental awareness.

Mediator Design for Coupled Electrochemical‐Chemical Reaction

ABSTRACT Electrochemical synthesis exploits electrode‐supplied electrons or holes as tunable redox equivalents. However, conventional electrocatalytic processes require electron transfer, substrate activation, and subsequent chemical conversion to all occur within the same electrode/electrolyte interfacial region. This interface‐confined paradigm increasingly restricts complex molecular synthesis, as multistep transformations require precise kinetic coupling unsustainable at a single interface. Coupled electrochemical–chemical reaction (CECR) systems overcome this limitation by employing redox mediators that functionally decouple electrode electron input from downstream substrate conversion. In these systems, the electrode generates, regenerates, or modulates active mediator states that relay charge, direct radical reactivity, or serve as electrophilic/nucleophilic units, forming target products via chemical steps away from the electrode surface. This review proposes a mediator‐centric paradigm for the rational design of CECR. We first examine the prerequisites for efficient CECR operation from thermodynamic, kinetic, and mediator‐design perspectives, focusing on driving force redistribution, rate‐space coordination, and the required properties of mediator molecules. Subsequently, based on the dominant role of the mediator in key transformations, we classify CECR mechanisms into three primary modes: electron‐transfer mediation, radical‐relay processes, and electrophilic/nucleophilic activation. This review aims to shift CECR from empirical reaction discovery toward mechanism‐guided electrosynthesis, enabling the preparation of high‐value chemicals.

Azobenzene's Cross‐Scale Optics and Photonics: Molecular Photoswitching, Mesoscopic Material Motions, and Adaptive Devices

ABSTRACT Azobenzene is a widely studied molecular photoswitch that converts light absorption into reversible E/Z isomerization and, when embedded in soft or ordered media, into optical, mechanical, thermal, transport, and bioadaptive functions. This review examines azobenzene optics and photonics through a cross‐scale structure‐property‐function framework. We first summarize the mechanistic landscape of trans–cis isomerization, including π–π* and n–π* excitation, ultrafast relaxation pathways, and molecular design rules that tune absorption wavelength, quantum yield, photostationary state (PSS), and cis‐ state lifetime. We then connect single‐molecule switching to collective responses in azobenzene‐containing materials, including photoalignment and all‐optical poling, stress‐driven surface patterning in amorphous polymers, photomechanics in liquid‐crystalline polymer networks (LCNs) and liquid crystal elastomers (LCEs), and phase‐transition‐based responses. On this basis, we organize applications according to their dominant device functions: information processing and reconfigurable photonics, dynamic liquid crystals (LCs) and adaptive optical devices, molecular solar thermal (MOST) energy storage, mechanical motion and soft robotics, mechanically enabled processing, bioadaptive transport, and opto/iontronic interfaces. The Review emphasizes quantitative links between molecular orientation, stress generation, and macroscopic deformation, and highlights how modeling and materials design can improve visible/red‐light operation, fatigue resistance, penetration depth, manufacturability, and device integration. We close by outlining challenges and opportunities for durable, scalable, and multifunctional azobenzene‐based adaptive photonic matter.

Hydrogen Radicals Enable an Alternative Kinetic Pathway for H ₂ O ₂ Photosynthesis through Dual Redox Site Regulation of Proton‐Coupled Electron Transfer

ABSTRACT Artificial photosynthesis offers a sustainable route for hydrogen peroxide (H 2 O 2 ) production, yet its efficiency is fundamentally limited by the kinetic decoupling of proton‐coupled electron transfer (PCET) during oxygen reduction. Here, we demonstrate that hydrogen radicals (H•) enable an alternative kinetic pathway for H 2 O 2 formation by accelerating the conversion of *OOH intermediates. This mechanism is realized through dual redox site regulation in Cu and O co‐modified Zn 3 In 2 S 6 (denoted as O/Cu‐ZIS). The introduction of Cu dopants increases hole density in the Zn─S layers, accelerating water oxidation kinetics and facilitating interfacial proton availability for oxygen reduction, while oxygen incorporation modulates the electronic structure of the In–S layer to promote electron transport, enhance O 2 activation, and weaken the interaction between protons and S sites. Quenching experiments and electron paramagnetic resonance spectroscopy support the participation of H• in the conversion of *OOH intermediates, providing an additional kinetic channel beyond conventional PCET. Finally, O/Cu‐ZIS achieves a H 2 O 2 production rate of 167.1 µmol g −1 min −1 from pure H 2 O and O 2 , markedly exceeds most state‐of‐the‐art photocatalysts. This work establishes H• as active intermediates in photocatalytic H 2 O 2 evolution and provides a strategy for regulating PCET via dual redox site design.

Multidimensional Feature Tuning in Category Selective Areas of Human Visual Cortex

Two prominent accounts describe the functional organization of human high-level visual cortex. A categorical view emphasizes category-selective areas, while a dimensional view highlights continuous feature maps spanning these areas. Here, we asked whether these two views reflect complementary expressions of the same underlying organization. Using a data-driven decomposition of fMRI responses from human participants (female and male) in face-, body-, and scene-selective areas, we identified spatially overlapping activity patterns that were shared across individuals. Each area encoded multiple interpretable dimensions capturing both finer within-category and coarser between-category distinctions, even in the most category-selective voxels. These dimensions formed distinct clusters within category-selective areas but extended as distributed maps across visual cortex. Together, these findings reveal an underlying organization that links category-selective areas to continuous feature maps, thereby reconciling categorical and dimensional accounts of high-level visual cortex.

Importance of Inclusion of Representative Populations in Pivotal Clinical Trials: Zolbetuximab as an Example

High‐Triplet‐Energy Ancillary‐Ligand Regulation of Dual‐Antenna Eu(III) Scintillators: Near‐Unity PLQY for 3D X‐Ray Videography

ABSTRACT Eu(III) complex scintillators, benefiting from efficient triplet‐exciton utilization and strong x‐ray absorption, are promising candidates for advanced x‐ray detection and imaging. However, current design strategies for dual‐antenna Eu(III) complex scintillators primarily prioritize low‐triplet‐energy primary ligands, whereas the energetic and mechanistic roles of high‐triplet‐energy ancillary ligands remain insufficiently explored. Herein, we present a systematic study on ancillary‐ligand‐regulated scintillation in dual‐antenna Eu(III) complex scintillators. Using dibenzoylmethane (DBM) as the primary ligand and three high‐triplet‐energy arylphosphine oxides as ancillary ligands, a series of Eu(DBM) 3 (L) complexes (L = Dpepo, Xpo, Dppbo) were constructed. Among them, Eu(DBM) 3 (Dppbo) exhibits a near‐unity photoluminescence quantum yield of 98.5% and an ultrahigh relative light yield of 61737 photons MeV −1 . This outstanding performance arises from triplet‐energy matching between the Dppbo and DBM that enhances ligand‐ligand charge transfer, together with increased ligand rigidity and ordered π–π stacking that suppresses nonradiative decay and facilitates charge‐carrier transport. Furthermore, Eu(DBM) 3 (Dppbo) was embedded into a styrene‐ethylene‐butylene‐styrene elastomer to afford a large‐area stretchable scintillation film, delivering &gt; 30 lp mm −1 in static x‐ray imaging and enabling advanced x‐ray videography, including 3D dynamic, underwater, and stretchable imaging. These findings establish ancillary‐ligand engineering as a general molecular design strategy for achieving highly efficient Eu(III) complex scintillators.