Stable, High‐Efficiency Voltage‐Dependent Color‐Tunable Organic Light‐Emitting Diodes with a Single Tetradentate Platinum(II) Emitter Having Long Operational Lifetime

High‐performance voltage‐dependent color‐tunable organic light‐emitting diodes (OLEDs) with a single Pt[O^N^C^N] emitter are fabricated. The emission color can be tuned from warm white to nature white or from orange to yellowish green, depending upon the emitter used. High external quantum efficiency (23.23%), low efficiency roll‐off, long‐term stability...

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Nanoscale‐Confined Terahertz Polaritons in a van der Waals Crystal

Extreme confinement of long‐wavelength terahertz radiation to nanoscale dimensions is achieved in the natural hyperbolic van der Waals crystal α‐MoO3. A range of highly anisotropic, in‐plane THz polaritonic excitations are directly visualized in the 8–12 THz spectral range, exhibiting ultralow‐loss propagation, tunable THz response, and orthogonal propagation...

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Turning On Solid‐State Luminescence by Phototriggered Subtle Molecular Conformation Variations

Solid‐state intelligent materials, in particular those showing photoresponsive luminescence (PRL), is desirable for their cutting‐edge applications but challenging. A PRL material that features sensitive and reversible fluorescence switching through phototriggering and thermal annealing is reported. The behavior is attributed to subtle molecular conformation...

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Heavy‐Atom‐Modulated Supramolecular Assembly Increases Antitumor Potency against Malignant Breast Tumors via Tunable Cooperativity

Self‐assembled multi‐iodinated boron dipyrromethene micelles (IBMs), via the interplay of both π–π stacking and hydrophobic interactions, are reported. These IBMs cause efficient cascade delivery into cytoplasm and tunable photoconversion for yielding potent antitumor synergy against triple‐negative breast cancer together with distinctly reduced recurrence...

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Stabilizing Anionic Redox Chemistry in a Mn‐Based Layered Oxide Cathode Constructed by Li‐Deficient Pristine State

O3‐type Li0.6[Li0.2Mn0.8]O2 is successfully developed, with the pristine state displaying both a Li excess in the transition metal layer and a deficiency in the alkali metal layer. Benefiting from stable structure evolution and Li migration processes, irreversible lattice oxygen loss and structure distortion are effectively restrained. Abstract...

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Performance Limits of an Alternating Current Electroluminescent Device

Electroluminescence can be achieved from nearly any emissive material with a single, generic device structure that uses alternating current voltage and a carbon nanotube contact. Performance limits of the device are studied through device modeling and experiments, demonstrating how low voltage and efficient electroluminescence can be achieved with emissive...

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Operando Tailoring of Defects and Strains in Corrugated β‐Ni(OH)2 Nanosheets for Stable and High‐Rate Energy Storage

Corrugated β‐Ni(OH)2, with outstanding activity and stability for hybrid supercapacitors, is developed through an electrochemical abuse strategy. Operando X‐ray absorption fine structure technique and finite element analysis demonstrate that the in situ tailored lattice defects and the strain‐induced highly curved micromorphology play critical roles...

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Tumor‐Associated Macrophage and Tumor‐Cell Dually Transfecting Polyplexes for Efficient Interleukin‐12 Cancer Gene Therapy

Intravenously administered polymeric interleukin‐12 (IL12) gene‐delivery vector transfects both tumor cells and macrophages to efficiently produce IL12 inside the tumor, which activates anticancer immune responses and the tumor microenvironment, leading to retarded tumor growth and prolonged animals’ survival with negligible systemic toxicities. This...

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Consequences of Chirality in Directing the Pathway of Cholesteric Helix Inversion of π‐Conjugated Polymers by Light

Alternating copolymers of fluorene and azobenzene exhibit exceptional chiroptical properties in annealed thin films. The chiroptical properties, polymer chain alignment, and their supramolecular helicity can be fully controlled by irradiating with polarized light. Intriguingly, the diastereomeric relationship between the supramolecular helicity of polymer...

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Designing Mechanical Metamaterials with Kirigami‐Inspired, Hierarchical Constructions for Giant Positive and Negative Thermal Expansion

A type of 2D hierarchical metamaterial that incorporates kirigami‐inspired bilayer actuating elements into periodic lattice patterns to allow for giant positive/negative CTEs is developed. Quantitative comparison to existing mechanical metamaterials suggests that the presented hierarchical metamaterials can substantially enlarge the accessible range...

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