Circularly Polarized 1540 nm Short‐Wave Infrared Electroluminescence from Er‐Based Halide LEDs with 3.06% Record EfficiencySong, Ruixin; Zhou, Donglei; Song, Renhuan; Wang, Yuqi; Guo, Jiyuan; Zhou, Shangwei; Wang, Enhui; Li, Wei; Zhou, Tingting; Bai, Xue; Song, Hongwei
doi: 10.1002/adma.73399pmid: 42141750
Er3+‐doped 1540 nm light‐emitting diodes (LEDs) are critical components in optical communications C‐band, non‐trunk communication, bioimaging, and sensing. However, integrating high luminous efficiency with tailored circularly polarized luminescence (CPL) in such LEDs remains a critical challenge. Here, we demonstrate efficient 1540 nm short‐wave infrared (SWIR) electroluminescence with distinct CPL in Cs3ErCl6 nanocrystals (NCs)‐based LEDs via a synergistic strategy of Sb3+/Y3+ co‐doping and camphor ligand modification. Y3+ doping modulates lattice symmetry, inducing Stark splitting of the Er3+ energy level and enhancing luminescence intensity. Sb3+ introduction triggers efficient self‐trapped excitons emission at 530 nm, whose energy levels match Er3+ states to boost energy transfer efficiency. Subsequently, camphor ligand exchange passivates Er3+‐related defects, increasing the 1540 nm photoluminescence quantum yield to 35.7% and endowing NCs with CPL (asymmetry factor: −3.67 × 10−2) via camphor's chiral structure. SWIR LEDs based on camphor‐modified Cs3Er0.7Y0.3Cl6: Sb3+ NCs exhibit a record‐high external quantum efficiency of 3.06% at 1540 nm, and first, demonstrate electrically‐driven circularly polarized 1540 nm emission with asymmetry factor of −3.08 × 10−2. This work presents a synergistic doping‐ligand strategy for Er‐based halide optoelectronics, offering a versatile platform to develop high‐performance long‐wavelength devices with integrated efficient emission and tailored polarization, crucial for advancing next‐generation optical communication and bioimaging.
Seta‐Inspired Mechano‐Intelligent Janus Bandage with Coordinated Adhesion–Contraction for Minimizing ScarringSuo, Di; Yang, Yuhe; Zhao, Shuai; Bei, Ho‐Pan; Lam, Avery Chik‐Him; Tan, Wei‐Qiang; Wong, Kenneth Kak‐yuen; Zhao, Xin
doi: 10.1002/adma.202505122pmid: 42136529
While advances have been made in mechano‐active and gecko‐inspired wound dressings, achieving dynamically coordinated adhesion–contraction coupling within a single‐material, stimulus‐free system with quantitatively programmable contractile output remains an unmet challenge. Here, we engineer bioinspired mechano‐intelligent Janus bandages (MIBs) with dynamically coordinated adhesion–contraction for effective wound healing. The MIBs are fabricated through micromolding of poly(lactide–co–propylene glycol–co–lactide) dimethacrylates (PmLnD), featuring an interior surface with a gecko‐mimicking wedged structure. Upon application, the MIBs recapitulate the gecko locomotion principle to achieve precise control of contractile forces with dynamically coordinated adhesion–contraction. The simply pre‐strained MIB can precisely program its intrinsic contractile force, while adhesion strength proportionally responds to the contractile force through enhanced van der Waals interactions and interfacial friction. This coordinated mechanism promotes healing in rat and porcine full‐thickness skin defect models by accelerating re‐epithelialization and enhancing angiogenesis. Mechanistically, the MIBs reduce focal adhesion kinase (FAK) expression, thereby regulating downstream pathways related to wound healing progression, including nuclear factor kappa B (NF‐κB), Wnt, and transforming growth factor‐beta (TGF‐β) pathways, enabling scar‐attenuated wound healing. We envision that this Janus design, which integrates strain‐programmable contraction with reversible gecko‐inspired adhesion, offers a useful addition to current mechanobiological strategies for wound management and soft tissue repair.
Modulating Interfacial Water Structure via Catalyst Engineering to Enhance Electrocatalytic Activity and SelectivityGuo, Jiangyi; Zhang, Lu‐Hua; Yu, Fengshou
doi: 10.1002/adma.73270pmid: 42084054
Renewable electricity‐driven electrocatalytic technology plays a crucial role in clean energy conversion and the realization of a net‐zero carbon emission future. Previous research has predominantly focused on regulating the adsorption behavior of reaction intermediates via catalyst engineering to enhance electrocatalytic performance. Such studies have only been centered on the solid phase at the solid–liquid interface. However, the effect of catalyst structural engineering on the liquid phase is equally crucial and has long been insufficiently emphasized. Interfacial water with unique structural configurations and dynamic properties has been shown to regulate critical steps in electrocatalytic reaction. Therefore, we are motivated to write this review, in order to systematically overview the research progress and key challenges in this area. This review first introduces the fundamental properties for interfacial water, including structural types and molecular orientation. Subsequently, a series of advanced experimental characterization techniques and computational methods are provided to detect interfacial water, which is crucial for obtaining accurate structural information. More importantly, we highlight various modulation strategies of the precise catalyst structure engineering to optimize interfacial water dynamics and boost electrocatalytic performance. Finally, we discuss the challenges and emerging perspectives in this fast‐developing field, providing valuable insights for guide future research directions.
Cold Atmospheric Plasma‐Activated Decellularized Extracellular Matrix Gel as a Tumor‐Infiltrating Immunoactivation Platform for Post‐Surgical Cancer ImmunotherapyFang, Tianxu; Chen, Mo; Deng, Yueyang; Ning, Tianqin; Luo, Tianwen; Chen, Guojun
doi: 10.1002/adma.202515444pmid: 41821382
Surgical resection is a frontline treatment for many solid tumors; however, residual tumor cells in the surgical cavity often lead to recurrence and metastasis. Adjuvant therapies are used to mitigate this risk but are frequently limited by systemic toxicity and variable efficacy. Here, we present an injectable, cold atmospheric plasma (CAP)‐loaded decellularized tumor extracellular matrix (DECM) hydrogel (denoted as CAP‐DECM gel) as a novel in situ tumor‐infiltrating immunoactivation platform for post‐surgical cancer immunotherapy. These gels combine two critical functionalities: the attraction of residual tumor cells by DECM‐derived chemokines and cytokines, and the local induction of immunogenic cell death (ICD) through CAP‐derived reactive species. Studies demonstrate that CAP‐DECM gels effectively recruit tumor cells, promote ICD hallmarks, activate various immune cells, including dendritic cells and macrophages, and elicit robust T‐cell responses. In murine post‐resection melanoma and breast cancer models, CAP‐DECM gels significantly suppressed tumor recurrence, reprogrammed the tumor microenvironment toward an immune‐supportive phenotype, and triggered systemic anti‐tumor immunity. Furthermore, combining CAP‐DECM gels with anti‐PD‐L1 checkpoint blockade therapy enhanced long‐term survival and conferred resistance to tumor rechallenge. Our results suggest that this tumor‐infiltrating immunoactivation platform transforms the surgical cavity into a self‐contained immune activation depot and offers a promising, personalized strategy for preventing tumor relapse.
Upcycling Waste PET Into Ionic Liquid‐Derived Small‐Molecule AdhesivesZhang, Heming; Yu, Lang; Ou, Xu; Ma, Yanan; Yang, Bingjie; Cui, Yongheng; Dong, Tianhong; Zhou, Yingjie; Yan, Feng
doi: 10.1002/adma.73381pmid: 42136537
The chemical upcycling of polyethylene terephthalate (PET) presents a critical pathway toward a circular plastics economy, yet existing methods are often hampered by high energy demands and downcycled products. Herein, we report a catalyst‐ and solvent‐free aminolysis strategy that depolymerizes waste PET into a versatile molecular precursor under mild conditions. This precursor is subsequently engineered into a series of low‐molecular‐weight ionic adhesives via strategic functionalization and supramolecular assembly. By leveraging a rich network of noncovalent interactions, such as hydrogen bonds and electrostatic forces, these materials achieve remarkable cohesion and interfacial adhesion. An alkoxy‐functionalized variant demonstrated an adhesion strength of 12.4 MPa on glass, ranking among the strongest small molecular‐based supramolecular adhesives reported. This work establishes a sustainable paradigm for converting waste polyester into value‐added functional materials, bridging the gap between plastic pollution and high‐value manufacturing, promotes the circular economy.
Challenges and Opportunities of Oligomeric Acceptors Toward Efficient and Stable Organic PhotovoltaicsDing, Yafei; He, Feng
doi: 10.1002/adma.202600017pmid: 42145002
High power conversion efficiency (PCE) and long‐term operational stability are essential prerequisites for the commercialization of organic solar cells (OSCs). Small‐molecule acceptors (SMAs) have driven remarkable advances in OSC performance, enabling continuous breakthroughs in device efficiency. However, OSCs based on SMAs generally suffer from poor long‐term stability, which severely limits their practical application. This instability primarily originates from the low glass transition temperatures (Tg) of SMAs, resulting in rapid molecular diffusion and aggregation, as well as morphological degradation of the active layer, leading to a subsequent decrease in device performance. Oligomeric small‐molecule acceptors (OSMAs) have recently emerged as a promising molecular design strategy to overcome these challenges. OSCs incorporating OSMAs have achieved impressive PCEs approaching 20%, while simultaneously exhibiting outstanding photothermal and mechanical stability. In this perspective, we systematically review recent progress in OSMA‐based OSCs and discuss the key factors governing their efficiency and stability, including molecular structure, aggregation behavior, and morphology evolution. Finally, we outline the current challenges and future opportunities for OSMA materials in advancing high‐performance and durable OSC technologies.