Advancing Perspectives on Chiral Assembly in Perovskite Material Design and Function Regulation - Featured Image
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Advancing Perspectives on Chiral Assembly in Perovskite Material Design and Function Regulation

Meifang Yang • Guangyi Cao • Xiuji Yi • Xinyi Lin • Gengling Liu • Yu-Xin Chen • Tian Tian * • Wen-Guang Li *
Transactions of Tianjin University

Chiral assembly endows perovskite materials with well-defined structural chirality and optical anisotropy, creating unique opportunities for multidimensional modulation in optoelectronic applications. Recent advances have demonstrated effective amplification of chiral signals, band structure engineering, and enhanced spin-orbit coupling through diverse strategies, including template-guided assembly, ligand-induced assembly, and several emerging approaches. This review highlights the latest progress in chiral perovskites for circularly polarized light-emitting devices, polarization-sensitive photodetectors, polarization imaging, optical communication and encryption, and spintronic and quantum information applications. Particular attention is devoted to the mechanistic correlations between assembly strategies and key performance parameters of chiral perovskites, such as dissymmetry factors, photoluminescence quantum yields, spin polarization degrees, and device stability.

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Synergistic Chlorine Source Regulation and Defect-Passivation Strategy for Stable Blue-Emitting Perovskite Films Toward Non-Invasive Jaundice Therapy - Featured Image
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Synergistic Chlorine Source Regulation and Defect-Passivation Strategy for Stable Blue-Emitting Perovskite Films Toward Non-Invasive Jaundice Therapy

Meifang Yang • Yicheng Yuan • Fangnan Shen • Wen-Guang Li • Yuansheng Jiang • Aili Wang • Lvzhou Li • Gengling Liu • Yu-xin Chen • Qin Xu • Huan Pang * • Tian Tian *
Advanced Optical Materials

Lead halide perovskites are promising next-generation optoelectronic materials due to their solution processability, tunable bandgap, and excellent photoelectric properties. However, achieving deep-blue emission in all-inorganic CsPbX3 nanocrystals remains challenging due to phase separation, halide volatilization, and insufficient stability, limiting industrial application. Herein, a collaborative strategy of chlorine source regulation, defect passivation, and fiber integration is proposed. By incorporating beta-cyclodextrin chloride (betaCD-Cl) into CsPbBr3, large-scale deep-blue CsPbBr3-xClx@betaCD-Cl microcrystals are synthesized via a mechanosynthesis route. Flexible blue-light fiber films fabricated via electrospinning show a photoluminescence quantum yield of 55.79% and excellent environmental stability. The films also enable near-infrared-to-blue photon upconversion, achieving efficient bilirubin degradation and showing promise for next-generation non-invasive phototherapeutic blankets.

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Tian Tian's Team Wins Third Prize at Yangzhou 2025 Green Poplar Golden Phoenix Talent Innovation and Entrepreneurship Competition - Featured Image
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Tian Tian's Team Wins Third Prize at Yangzhou 2025 Green Poplar Golden Phoenix Talent Innovation and Entrepreneurship Competition

Tian Tian's team demonstrated outstanding performance in the Yangzhou 2025 Green Poplar Golden Phoenix Talent Innovation and Entrepreneurship Municipal Final Competition and was awarded the Third Prize.

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Moth-Eye-Engineered Flexible Films for X-Ray Shielding and Persistent Radiation Warning - Featured Image
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Moth-Eye-Engineered Flexible Films for X-Ray Shielding and Persistent Radiation Warning

Yuansheng Jiang • Wen-Guang Li • Xiuji Yi • Meifang Yang • Xinyi Lin • Yaxun Hu • Yicheng Yuan • Qiang Ma • Yuping Li • Fengyun Wang • Qin Xu • Wenjing Zhang • Yu-Xin Chen * • Tian Tian * • Huan Pang *
Advanced Science

Developing flexible radiation detectors that maintain high performance under harsh environmental conditions remains a significant materials challenge. Conventional flexible scintillators often sacrifice either performance or stability. This study designed bioinspired SrAl2O4:Eu2+, Dy3+@SiO2 composites, where strong Al-O-Si covalent bonds created a unique moth-eye morphology. Films produced through a scalable electrospinning process demonstrate excellent resistance to water, acids, and alkalis, ensuring stable performance in harsh environments. Comprehensive testing confirms high X-ray shielding efficiency, ultrasensitive detection of low-dose-rate X-rays, high-resolution X-ray imaging, and prolonged radiation-induced visual warning.

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Unlocking radioluminescence in copper cyclic trinuclear complexes - Featured Image
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Unlocking radioluminescence in copper cyclic trinuclear complexes

Yu-Xin Chen • Ying-Guang Li • Jiali Fan • Hao Zhuo • Zhennan Zhou • Hua Tong • Meifang Yang • Wen-Guang Li • Jiayi Wu • Huan Pang • Wei Liu • Chao Wu * • Tian Tian * • Gangfeng Ouyang *
Science Advances

Conventional scintillators that rely on heavy metals and halides often struggle with high costs, synthetic complexity, toxicity, and afterglow, while organic scintillators suffer from low light yield and complicated synthesis. This study introduces a family of scintillators based on copper(I) cyclic trinuclear complexes that combine strong radioluminescence with low cost, facile synthesis, nontoxicity, and environmental compatibility. Experimental and computational analyses reveal a distinct luminescence mechanism dominated by intermolecular Cu(I)...Cu(I) interactions. An unconventional halogen-free strategy substantially enhances the radioluminescence of a methyl-substituted copper(I) trinuclear complex, achieving an exceptional light yield of about 70,475 photons/MeV.

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Multicolor Rare-Earth Film with Ultra-Long Afterglow for Diverse Energy-Saving Applications - Featured Image
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Multicolor Rare-Earth Film with Ultra-Long Afterglow for Diverse Energy-Saving Applications

Xinyi Lin • Huixuan Han • Meifang Yang • Zongxuan Yuan • Zihao Chen • Wen-Guang Li • Hui Kang • Songtao Zhang • Yizhou Zhang • Yu-Xin Chen* • Tian Tian* • Huan Pang*
Advanced Materials

Rare-earth afterglow materials, with their unique light-storage properties, show great promise for diverse applications. However, their broader applicability is constrained by challenges such as poor solvent compatibility, limited luminescent efficiency, and monochromatic emissions. In this study, these limitations are addressed by blending ZnS with various rare-earth phosphors including (Sr₀.₇₅Ca₀.₂₅)S:Eu²⁺; SrAl₂O₄:Eu²⁺, Dy³⁺ and Sr₂MgSi₂O₇:Eu²⁺, Dy³⁺ to modulate deep trap mechanisms and significantly enhance both the afterglow and light capture capabilities. Using electrospinning, a large-area (0.4 m × 3 m) afterglow film is successfully fabricated with tunable colors and an extended afterglow duration exceeding 30 h. This film demonstrates thermoluminescence, enabling potential integration into fire-rescue protective clothing for enhanced emergency visibility. In greenhouse settings, it effectively supports chlorophyll synthesis and optimizes conditions for plant growth over a 24-h cycle. For tunnel and garage applications, the film captures and stores light from vehicle headlights at distances of up to 70 meters. The scalability and cost-effectiveness of this afterglow film underscore its considerable potential for real-world applications across multiple fields, marking a significant advancement in sustainable illumination technology.

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Emission and Absorption Spectroscopic Techniques for Characterizing Perovskite Solar Cells - Featured Image
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Emission and Absorption Spectroscopic Techniques for Characterizing Perovskite Solar Cells

Zongxuan Yuan • Meifang Yang • Lei Zhang • WenGuang Li • Tian Tian* • Huan Pang*
American Chemical Society

In the research of perovskite solar cells (PSCs), a fundamental understanding of the photoelectric conversion process is crucial for exploring mechanisms and optimizing performance, which largely relies on accurately capturing experimental phenomena. Spectral techniques, especially photoluminescence (PL) spectroscopy, time-resolved photoluminescence (TRPL) spectroscopy, photoluminescence quantum yield (PLQY) measurement, photoluminescence (PL) mapping spectroscopy, and transient absorption (TA) spectroscopy, are highly valued for their ability to provide detailed information about the material's working state. In this Review, we provide an overview of the latest advancements in these spectral techniques in PSC research. We demonstrate their advantages in monitoring the reconstruction of electronic structure, carrier dynamics, evolution of interfacial states, and separation of photogenerated charges in PSCs. Additionally, we discuss how to interpret the underlying physical and chemical processes in perovskite materials based on these spectral characterizations. Ultimately, we look forward to these techniques providing deeper insights into the further development of PSCs and their application in the field of renewable energy.

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Advancing Perspectives on Large-Area Perovskite Luminescent Films - Featured Image
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Advancing Perspectives on Large-Area Perovskite Luminescent Films

Lei Zhang • Hui Kang • Xinyi Lin • Qin Xu • Bing-Xin Lei* • Tian Tian* • Huan Pang
American Chemical Society

The excellent photoelectric properties of perovskite materials are mainly attributed to their high optical absorption coefficients, high carrier mobility, long carrier lifetimes, and adjustable band gaps. The ability of these materials to be engineered into large-area films offers significant advantages for practical applications, particularly in the context of portable and wearable technologies. Their lightweight and flexible characteristics further enhance their suitability for a wide range of innovative uses, from consumer electronics to advanced display technologies. Given the promising potential of large-area perovskite luminescent films (PLF), it is crucial to understand both their underlying properties and the mechanisms driving their luminescence. Therefore, this paper primarily summarizes the luminescence mechanisms of large-area PLF, including electroluminescence, photolumines-cence, and mechanoluminescence. It also explores several key fabrication methods in detail. Additionally, the paper highlights the potential applications of these luminescent films, particularly in lightweight, flexible, and wearable technologies, and discusses their prospects in practical applications. By analyzing the current state of research, this paper seeks to underscore the critical role that large-area PLF are poised to play in the future of optoelectronic devices.

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Unlocking multi-photon excited luminescence in pyrazolate trinuclear gold clusters for dynamic cell imaging - Featured Image
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Unlocking multi-photon excited luminescence in pyrazolate trinuclear gold clusters for dynamic cell imaging

YuXin Chen • Haidong Yu • Lihua Wu • YuanJun Tong • Jianqiao Xu • Huan Pang • Chao Wu* • Tian Tian* • Gangfeng Ouyang*
Nature Communications

The family of coinage-metal-based cyclic trinuclear complexes exhibits abundant photophysical properties, promising for diverse applications. However, their utility in biochemistry is often hindered by large particle size and strong hydrophobicity. Meanwhile, the investigation into multi-photon excited luminescence within this family remained undocumented, limiting their potential in bio-imaging. Herein, we unveil the multi-photon excited luminescent properties of pyrazolate-based trinuclear gold(I) clusters, facilitated by excimeric gold(I)···gold(I) interactions, revealing a nonlinear optical phenomenon within this family. Furthermore, to address issues of poor biocompatibility, we employ electrospinning coupled with hydroxypropyl-beta-cyclodextrin as the matrix to fabricate a flexible, durable, transparent, and red emissive film with a photoluminescence quantum yield as high as 88.3%. This strategy not only produces the film with sufficient hydrophilicity and stability, but also achieves the downsizing of trinuclear gold(I) clusters from microscale to nanoscale. Following the instantaneous dissolution of the film in the media, the released trinuclear gold(I) nanoparticles have illuminated cells and bacteria through a real-time, non-toxic, multi-photon bio-imaging approach. This achievement offers a fresh approach for utilizing coinage-metal-based cyclic trinuclear complexes in biochemical fields.

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Durable organic nonlinear optical membranes for thermotolerant lightings and in vivo bioimaging - Featured Image
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Durable organic nonlinear optical membranes for thermotolerant lightings and in vivo bioimaging

Tian Tian • Yuxuan Fang • Wenhui Wang • Meifang Yang • Ying Tan • Chuan Xu • Shuo Zhang • Yuxin Chen • Mingyi Xu* • Bin Cai* • Wu-Qiang Wu*
Nature Communications

Organic nonlinear optical materials have potential in applications such as lightings and bioimaging, but tend to have low photoluminescent quantum yields and are prone to lose the nonlinear optical activity. Herein, we demonstrate to weave large-area, flexible organic nonlinear optical membranes composed of 4-N,N-dimethylamino-4ʹ-Nʹ-methyl-stilbazolium tosylate@cyclodextrin host-guest supramolecular complex. These membranes exhibited a record high photoluminescence quantum yield of 73.5%, and could continuously emit orange luminescence even being heated at 300 °C, thus enabling the fabrication of thermotolerant light-emitting diodes. The nonlinear optical property of these membranes can be well-preserved even in polar environment. The supramolecular assemblies with multiphoton absorption characteristics were used for in vivo real-time imaging of Escherichia coli at 1000 nm excitation. These findings demonstrate to achieve scalable fabrication of organic nonlinear optical materials with high photoluminescence quantum yields, and good stability against thermal stress and polar environment for high-performance, durable optoelectronic devices and humanized multiphoton bio-probes.

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