Article
Chemistry, Multidisciplinary
Mengqi Zhu, Zhineng Zhang, Tao Zhang, Dongdong Liu, Hao Zhang, Zhenxiao Zhang, Zhuolun Li, Yingchun Cheng, Wei Huang
Summary: This study reveals the influence of high pressure and tensile strain on interlayer and intralayer excitons in the WSe2/WS2 heterostructure. High pressure can transform intralayer excitons to interlayer excitons, while tensile strain leads to the transformation of interlayer excitons to intralayer excitons.
Article
Chemistry, Physical
Hui Peng, Bingsuo Zou
Summary: Low-dimensional metal halides (LDMHs) have attracted attention for their unique crystal structures and photonic properties. They are promising candidates for developing lighting, photodetectors, and biological imaging due to their simple synthesis and rich photonic properties. However, there is still a lack of research on transition-metal halides or doped halides in relation to their spin characteristics.
JOURNAL OF PHYSICAL CHEMISTRY LETTERS
(2022)
Article
Chemistry, Multidisciplinary
Keisuke Shinokita, Yuhei Miyauchi, Kenji Watanabe, Takashi Taniguchi, Kazunari Matsuda
Summary: The moire patterns in van der Waals heterostructures can be used to engineer optically generated excitonic properties, offering the possibility for coherent quantum emitters and quantum simulation. The interaction between moire excitons and phonons can be tuned by adjusting the excitation energy, leading to selective excitation at phonon resonances and relaxation between different potential minima. This resonant coupling of moire excitons to phonons highlights a new way to explore novel quantum phenomena.
Article
Multidisciplinary Sciences
Donghai Li, Chiara Trovatello, Stefano Dal Conte, Matthias Nuss, Giancarlo Soavi, Gang Wang, Andrea C. Ferrari, Giulio Cerullo, Tobias Brixner
Summary: Research on exciton-phonon coupling in single-layer transition metal dichalcogenides has shown stronger coupling compared to most other inorganic semiconductor nanostructures. Utilizing two-dimensional micro-spectroscopy, the study provides a unique tool to measure the characteristics of exciton-phonon coupling and design-relevant parameters for the development of optoelectronic devices.
NATURE COMMUNICATIONS
(2021)
Article
Multidisciplinary Sciences
Yan Lv, Chunyang Yin, Chunfeng Zhang, Xiaoyong Wang, Zhi-Gang Yu, Min Xiao
Summary: Researchers have studied single CsPbI3 nanocrystals using resonant and near-resonant excitation techniques to probe continuous and size-quantized acoustic-phonon modes, marking a critical step towards the advancement of superior quantum-light sources.
NATURE COMMUNICATIONS
(2021)
Article
Chemistry, Physical
Xiaohan Li, Aijun Liu, Zhaoyu Wang, Youchao Wei, Qun Lin, Yameng Chen, Yongsheng Liu, Maochun Hong
Summary: A doping-enhanced exciton-phonon coupling effect is observed in Cs3Cu2I5 nanocrystals, leading to a significant increase in their self-trapped excitons emission efficiency. This discovery shows great potential for improving optoelectronic devices.
Article
Chemistry, Multidisciplinary
Kenichi Cho, Takumi Yamada, Hirokazu Tahara, Terumasa Tadano, Hidekatsu Suzuura, Masaki Saruyama, Ryota Sato, Toshiharu Teranishi, Yoshihiko Kanemitsu
Summary: Lead halide perovskite nanocrystals exhibit excellent photoluminescence properties, with high quantum yields and tunable wavelengths. Single-dot spectroscopy was used to explore the photoluminescence spectra of formamidinium lead halide perovskite NCs, revealing multiple peaks below the exciton peak. As the size of the NCs decreases, the binding energies of biexcitons and trions increase, while the phonon energies show no size dependence but the exciton-phonon coupling strength increases for smaller NCs. This study provides valuable insights into the exciton properties of perovskite NCs.
Article
Optics
Qiuxiang Zhu, Weichu Xiao, Wenguo Li, Lincheng Zhang, Yaqi Deng, Xuejun Zhang, Zhengbo Jian, Xiuxiu Dong
Summary: Investigating the coupling mechanism between surface plasmons and excitons is crucial for achieving efficient and stable excitonic optoelectronic devices. By sputtering Au nanoparticles on CdS microbelts, the energy coupling effect mediated by surface plasmons was explored, leading to enhanced excitonic emission intensity and red-shift of peaks in Fabry-Perot resonant lasing spectra. The temperature-dependent photoluminescence analysis indicated that the optical phenomenon may be attributed to the exciton-phonon coupling.
Article
Engineering, Geological
K. Y. Li, X. W. Tang, M. L. Fei, W. L. Chen, J. X. Liang, Q. Q. Xiang
Summary: In this study, the fractal model of permeability coefficient in woven slit-film geotextiles is extended to predict the permeability coefficient under uniaxial and laterally constrained uniaxial tensile strains. A pore unit model is introduced based on the observation of pore size distribution patterns. A new clamping device capable of applying different tensile strains to geotextiles is invented. Experimental results show that permeability coefficient increases with increasing uniaxial tensile strain, especially for thinner geotextiles and geotextiles under laterally constrained uniaxial strain conditions. The improved model accurately predicts the permeability coefficient of woven geotextiles under different tensile strains.
GEOSYNTHETICS INTERNATIONAL
(2023)
Article
Chemistry, Multidisciplinary
Dipti Jasrasaria, Eran Rabani
Summary: This study developed an atomistic approach for describing exciton-phonon coupling in semiconductor nanocrystals and validated the method's reliability. Experimental results showed that exciton-phonon coupling leads to lattice distortion in nanocrystals, with surface modes playing a significant role in smaller nanocrystals and interior modes dominating in larger systems.
Article
Physics, Applied
Yu-Chen Chang, Bipul Das, Yu-Fan Chiang, Wen-Hao Chang, Yen-Chun Chen, Rahul Kesarwani, Wen-Cheng Ke, Yann-Wen Lan, Ting-Hua Lu
Summary: Displacement in conventional Raman spectroscopy can be caused by an increase in material layers or strain variation. Polarization-resolved Raman spectroscopy provides a method to distinguish between them. This study uses polarization-resolved Raman spectroscopy and numerical analysis to investigate strained graphene induced by different substrates. The research shows that the polarization properties of scattered light in strained graphene are different from unstrained graphene due to phonon polarization deformation caused by different strengths of substrate coupling. This research provides an efficient quantitative method to explore strain anisotropy in two-dimensional materials, which is important for the development of straintronics in the future.
APPLIED PHYSICS LETTERS
(2023)
Article
Chemistry, Multidisciplinary
Jingang Li, Kan Yao, Yun Huang, Jie Fang, Pavana Siddhartha Kollipara, Donglei Emma Fan, Yuebing Zheng
Summary: In this work, chemically synthesized transition metal dichalcogenide (TMDC) nanowires are used as dielectric nanoresonators to support both excitonic and Mie resonances. Strong light-matter couplings and tunable exciton polaritons are demonstrated in individual nanowires. The TMDC nanoresonators, with highly tunable optical properties, have potential applications in tunable optical nanodevices.
ADVANCED MATERIALS
(2022)
Article
Materials Science, Multidisciplinary
Dapeng Huang, Fei Liang, Ruiqi Guo, Dazhi Lu, Jiyang Wang, Haohai Yu, Huaijin Zhang
Summary: This study demonstrates the enhancement of exciton-phonon coupling in 2D MoSi2N4 material and the first realization of strong coupling between exciton and phonon at room temperature. It is of great significance for exploring strongly correlated many-body quantum states and their applications in quantum systems.
ADVANCED OPTICAL MATERIALS
(2022)
Article
Chemistry, Physical
Yunuan Wang, Feilong Song, Yu Yuan, Jianchen Dang, Xin Xie, Sibai Sun, Sai Yan, Yanbing Hou, Zhidong Lou, Xiulai Xu
Summary: This study reports a strong coupling between triplet excitons and longitudinal-optical phonons in 2D layered hybrid perovskites, with the coupling strength significantly higher than that of singlet excitons. This understanding of the triplet exciton-LO phonon coupling provides insight into many-body interactions in hybrid perovskites, which can be beneficial for the development and optimization of optoelectronic devices based on 2D perovskites in the future.
JOURNAL OF PHYSICAL CHEMISTRY LETTERS
(2021)
Article
Optics
Chenran Xu, Han Cai, Da-Wei Wang
Summary: The research team proposed a new configuration based on the Tamm structure to support the excitation of PhPs in both transverse-electric and transverse-magnetic modes, achieving VSC in a 300 nm thick molecular layer. This study provides a new platform for sensing vibrational modes in free space and controlling chemical reactions.
JOURNAL OF THE OPTICAL SOCIETY OF AMERICA B-OPTICAL PHYSICS
(2021)
Article
Chemistry, Multidisciplinary
Jianguo Sun, Bin Li, Long Hu, Junjun Guo, Xufeng Ling, Xuliang Zhang, Chi Zhang, Xianxin Wu, Hehe Huang, Chenxu Han, Xinfeng Liu, Youyong Li, Shujuan Huang, Tom Wu, Jianyu Yuan, Wanli Ma
Summary: Solution processable semiconductors like organics and emerging lead halide perovskites (LHPs) are ideal candidates for photovoltaics. This study investigates a novel device architecture involving block copolymer/perovskite hybrid bulk heterointerfaces, which enhances light absorption, energy level cascade, and provides a thin hydrophobic layer to improve carrier generation and prevent moisture invasion. The resulting hybrid solar cell exhibits high efficiency and stability, and the approach can be extended to other LHPs.
ADVANCED MATERIALS
(2023)
Review
Chemistry, Multidisciplinary
Uma V. Ghorpade, Mahesh P. Suryawanshi, Martin A. Green, Tom Wu, Xiaojing Hao, Kevin M. Ryan
Summary: This review provides an overview of the development of versatile chalcohalide materials, focusing on their design, synthesis, optoelectronic properties, and applications in energy conversion and storage devices. Computational techniques, theoretical and experimental approaches are employed to understand the band structures, stability, and structural chemistry of these materials. The review also discusses the challenges and future research directions in this field.
Article
Nanoscience & Nanotechnology
Xingjie Lv, Guoliang Yuan, Tom Wu, Zhibo Yan, Ben Xu, Guanghua Liu, Jun-Ming Liu
Summary: This study investigates the four different lifetimes of photocarriers in MAPbI(3) single crystal, shedding light on the physical mechanisms and facilitating the design of novel electronics with halide perovskite semiconductors.
ADVANCED ELECTRONIC MATERIALS
(2023)
Review
Multidisciplinary Sciences
Weili Yu, Feng Li, Tao Huang, Wei Li, Tom Wu
Summary: Halide perovskite heterojunctions combine the properties of multi-dimensional perovskites and selected semiconductors, surpassing the limitations of a single component. This platform allows for material property tuning, discovery of interesting phenomena, and enables novel applications.
Article
Chemistry, Multidisciplinary
Xinming Zhang, Song Lin, Feng Zhao, Jing Zhang, Shan Lei, Fang Bai, Qiang Liu, Jiayingzi Wu, Ting He, Peng Huang, Jing Lin
Summary: A programmably controllable delivery system based on croconium dye (Croc)-ferrous ion (Fe2+) nanoprobes (CFNPs) is developed for multiscale dynamic imaging guided photothermal primed CDT. The CFNPs achieve pH-responsive visualization and accurate Fe2+ release in cancerous tissues under the coactivation of acidity and near-infrared (NIR) light. By leveraging multiscale dynamic imaging technologies, the complicated spatiotemporal release of Fe2+ is sketched in a programmably controllable manner, revealing the domino effect of tumor pH level, photothermal effect, and CDT within the disease microenvironment.
ADVANCED MATERIALS
(2023)
Review
Computer Science, Interdisciplinary Applications
Ting He, Anas Belouali, Jessica Patricoski, Harold Lehmann, Robert Ball, Valsamo Anagnostou, Kory Kreimeyer, Taxiarchis Botsis
Summary: Identifying patient cohorts with specific phenotypes is essential in biomedicine, and many research groups have developed pipelines to automate this task. This study conducted a systematic review on computable clinical phenotyping, analyzing 139 selected records to extract information on target use cases, data-related topics, phenotyping methodologies, evaluation strategies, and portability of developed solutions. The findings highlight the need for defining target use cases, moving away from sole machine learning strategies, and evaluating proposed solutions in real settings.
JOURNAL OF BIOMEDICAL INFORMATICS
(2023)
Article
Optics
Yi Tian Thung, Rui Duan, Emek G. Durmusoglu, Yichen He, Lian Xiao, Calvin Xiu Xian Lee, Wen Siang Lew, Lin Zhang, Hilmi Volkan Demir, Handong Sun
Summary: Colloidal quantum wells (CQWs) are a promising gain material for optical feedback due to their unique excitonic features from 1D confinement, but current integration methods result in low laser quality. To address this, a liquid-interface kinetically driven self-assembly method is proposed to coat ultrathin CQWs onto silica microsphere cavities, achieving high-quality microlasers with a Q-factor of 13,000 at room temperature. Stable single-mode lasing output is demonstrated through evanescent field coupling in a 2D-3D microcavity configuration, highlighting the potential for future miniaturized colloidal optoelectronic and photonic applications.
LASER & PHOTONICS REVIEWS
(2023)
Article
Chemistry, Multidisciplinary
Hebin Wang, Junzi Li, Haolin Lu, Sehrish Gull, Tianyin Shao, Yunxin Zhang, Tengfei He, Yongsheng Chen, Tingchao He, Guankui Long
Summary: In this study, a novel chiral hybrid germanium halide material was developed with large anisotropy factors and high laser-induced damage thresholds. Its linear and nonlinear chiroptical properties were systematically investigated, showing high values of anisotropy factors and second-order nonlinear optical coefficient. These findings provide a new avenue for lead-free chiral hybrid metal halides in nonlinear chiroptical applications.
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
(2023)
Article
Chemistry, Physical
Xuanyu Zhang, Shuyu Xiao, Zhihang Guo, Baozhen Yuan, Xiongbin Wang, Samo Zhang, Yueqing Shi, Guichuan Xing, Tingchao He, Rui Chen
Summary: It is found that constructing core-shell structure of FAPbBr(3)/CsPbBr3 nanocrystals can enhance the action cross section of high-order multiphoton absorption. Fluorescence induced by up to five-photon absorption was observed. The increased dielectric constant promotes modulation of multiphoton absorption effects through the local field effect, and the quasi-type-II band alignment suppresses the biexciton Auger recombination, ensuring stronger multiphoton absorption induced fluorescence. Furthermore, the core-shell structure reduces defect density and promotes nonradiative energy transfer through the antenna-like effect. This work provides a new avenue for the development of high-performance multiphoton excited nanomaterials for future photonic integration.
JOURNAL OF PHYSICAL CHEMISTRY LETTERS
(2023)
Review
Quantum Science & Technology
Tingchao He, Yanyan Cui, Junzi Li, Yang Gao
Summary: This review summarizes the recent progress in construction strategies and photophysical properties of chiral PeNCs, with a focus on synthetic methods, chiroptical properties, nonlinear optics, and chiral spintronics.
ADVANCED QUANTUM TECHNOLOGIES
(2023)
Article
Chemistry, Multidisciplinary
Huan Liu, Peixian Chen, Xuanyu Zhang, Xiongbin Wang, Tingchao He, Rui Chen
Summary: Two-dimensional colloidal CdSe nanoplatelets (NPLs) with different structures were synthesized and their optical properties were characterized. It was found that the photoluminescence quantum yield of the NPLs improved significantly after the growth of the CdS crown layer. The emission intensity ratio at low temperatures suggested that the radiative recombination centers were mainly located on the lateral surface, which was confirmed by surface passivation experiment. Additionally, the ligand exchange experiment confirmed the presence of nonradiative recombination centers on the lateral surface. These findings highlight the importance of understanding the optical properties of the lateral surface of NPLs for optoelectronic applications.
Article
Chemistry, Multidisciplinary
Lian Xiao, Tingting An, Chuxia Deng, Xiaoling Xu, Handong Sun
Summary: Lead based halide perovskites have limitations due to the toxicity of lead, and thus Pb-free perovskites such as Sn based halide perovskites are being proposed. However, the toxicity and environmental impact of tin-based halide perovskites are still under debate. In this study, comprehensive toxicity evaluations of Sn based halide perovskites were conducted, which demonstrated that even under worst case scenarios, no acute toxicity or gene level risks were observed. Therefore, it is concluded that Sn based halide perovskites are bio-safe and can be used as a substitute for lead in perovskite materials.
ENERGY & ENVIRONMENTAL SCIENCE
(2023)
Review
Materials Science, Multidisciplinary
Dawei Duan, Chuangye Ge, Md Zahidur Rahaman, Chun-Ho Lin, Yumeng Shi, Haoran Lin, Hanlin Hu, Tom Wu
Summary: Metal halide perovskites are easy to synthesize and have tunable physical properties and excellent performance, making them important optoelectronic materials. One-dimensional (1D) nanostructures at both the morphological and molecular levels enhance the performance of optoelectronic devices. Recent progress in the synthesis and characterization of 1D halide perovskites with tunable structures, compositions, and properties, as well as their applications in photovoltaics, light emission, and photodetection, is highlighted. Current challenges, future prospects, and promising research directions are discussed to advance the field of 1D perovskites.
NPG ASIA MATERIALS
(2023)
Article
Chemistry, Multidisciplinary
Jiaying Lin, Rulin Liu, Peixian Chen, Yangfei Lv, Junjie Hao, Meijuan Chen, Dongxiang Zhang, Ruikun Pan, Yiwen Li, Xi Zhu, Tingchao He, Jiaji Cheng
Summary: Stimulating and harnessing circularly polarized luminescence (CPL) is crucial for understanding chirogenesis in physical chemistry and implementing it in research fields such as chiral optoelectronics and theranostics. In this study, red-emissive carbonized polymer dots (CPDs) with enhanced circular dichroism (CD) and CPL activities were synthesized using a biomolecule-tailored organic-inorganic co-assembly strategy. The obtained CPL signals can be manipulated in an excitation-dependent manner, indicating a synergistic-competition phenomenon between configurational chirality and intermolecular energy-transfer dynamics.
Article
Optics
Fuli Zhao, Yanyan Cui, Anfu Wang, Yang Gao, Tingchao He
Summary: This work reports the optical properties of inverted type-I ZnSe/InP/ZnS quantum dots (QDs) with photoluminescence (PL) emission in the near-infrared (NIR) range. The QDs exhibit higher exciton-binding energy and weaker carrier-phonon coupling effect than conventional type-I InP-based QDs. In addition, they show strong two-photon absorption characteristics in the second biological window.
JOURNAL OF LUMINESCENCE
(2024)
