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32 results on '"Xu, Hengxing"'

3. Comprehensive defect suppression in perovskite nanocrystals for high-efficiency light-emitting diodes

Author

Kim, Young-Hoon, Kim, Sungjin, Kakekhani, Arvin, Park, Jinwoo, Park, Jaehyeok, Lee, Yong-Hee, Xu, Hengxing, Nagane, Satyawan, Wexler, Robert B., Kim, Dong-Hyeok, Jo, Seung Hyeon, Martínez-Sarti, Laura, Tan, Peng, Sadhanala, Aditya, Park, Gyeong-Su, Kim, Young-Woon, Hu, Bin, Bolink, Henk J., Yoo, Seunghyup, Friend, Richard H., Rappe, Andrew M., and Lee, Tae-Woo

Published
2021
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18. Revealing long–range orbit–orbit interaction between coherent light-emitting excitons occurring in amplified spontaneous emission in CsPbBr3 microstructures.

Author

Wang, Miaosheng, Zhang, Jia, Zhu, Xixiang, Xu, Hengxing, and Hu, Bin

Abstract

Amplified spontaneous emission (ASE) has become a common phenomenon in hybrid perovskites by establishing coherent light-emitting excitons. This paper reports a new phenomenon that the long–range orbit–orbit interaction is established through orbital polarizations between coherent light-emitting excitons during the generation of ASE in the CsPbBr3 microrods. Essentially, when the orbital polarizations are optically generated with the same direction between coherent light-emitting excitons by using a circularly polarized pumping beam, the ASE amplitude can be largely enhanced by 22.3%, as compared to the situation when the orbital polarizations are generated with opposite directions by using linearly polarized photoexcitation in randomly orientated microstructures. This observation provides evidence that long–range orbit–orbit interaction occurs between coherent light-emitting excitons in ASE. Furthermore, the long–range orbit–orbit interaction between coherent light-emitting excitons is simultaneously increased with the ASE amplitude while increasing the pumping fluence. Therefore, the long–range orbit–orbit interaction plays an important role in developing coherent light-emitting excitons towards ASE in metal halide perovskites. [ABSTRACT FROM AUTHOR]

Published
2021
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19. Evaluation Method for Quality of Aquatic Eco-environmental Functional Area in Taihu Basin, Jiangsu Province.

Author

LYU Xueyan, CHEN Qiao, CAI Kun, LI Jiying, ZHANG Yong, XU Dongjiong, ZHANG Xiang, and XU Hengxing

Abstract

Under the background of the change of management objectives of Taihu Basin, it is particularly important to establish a set of scientific and concise evaluation methods for functional areas of aquatic eco-environment that are convenient for operational application. Based on the collected data at home and abroad, and the theory of biological integrity, combined with the actual biological monitoring ability, a comprehensive quality evaluation method for aquatic eco-environment function area was established, with total taxa number, biological density, and the dominance of former three dominant species chosen for the constitution of planktonic algae integrity index; molluscan taxa number, the dominance of dominant species and biological monitoring working party (BMWP) chosen for the constitution of benthic invertebrates integrity index; chlorophyll a, transparency, permanganate index, total phosphorus and total nitrogen used for lake and reservoir water quality evaluation; dissolved oxygen, ammonia nitrogen, permanganate index, total phosphorus and total nitrogen used for river water quality evaluation. The evaluation method is strongly to support the target demand of continuous improvement of water ecological environment quality in the process of watershed management target transformation. [ABSTRACT FROM AUTHOR]

Published
2020
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21. Photoexcitation-Controllable Magnetization in Magnetic–Semiconducting Nanohybrid Containing γ-Fe2O3–Graphene (0D–2D) van der Waals Heterostructure Based on Steady-State Pump–Probe Light Scattering Measurement in Magnetic Field

Author

Xu, Hengxing, primary, Prabhakaran, Prem, additional, Kim, Sung Hyun, additional, Jung, Juhyung, additional, Narayan, Rekha, additional, Kim, Sang Ouk, additional, Lee, Kwang-Sup, additional, and Hu, Bin, additional

Published
2018
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25. Magnetodielectric Response from Spin–Orbital Interaction Occurring at Interface of Ferromagnetic Co and Organometal Halide Perovskite Layers via Rashba Effect

Author

Li, Mingxing, primary, Li, Ling, additional, Mukherjee, Rupam, additional, Wang, Kai, additional, Liu, Qing, additional, Zou, Qiang, additional, Xu, Hengxing, additional, Tisdale, Jeremy, additional, Gai, Zheng, additional, Ivanov, Ilia N., additional, Mandrus, David, additional, and Hu, Bin, additional

Published
2016
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27. Enhanced π–d Electron Coupling in the Excited State by Combining Intramolecular Charge‐Transfer States with Surface‐Modified Magnetic Nanoparticles in Organic–Magnetic Nanocomposites

Author

Li, Mingxing, primary, Wang, Min, additional, He, Lei, additional, Hsiao, Yu‐Che, additional, Liu, Qing, additional, Xu, Hengxing, additional, Wu, Ting, additional, Yan, Liang, additional, Tan, Loon‐Seng, additional, Urbas, Augustine, additional, Chiang, Long Y., additional, and Hu, Bin, additional

Published
2015
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32. Magneto-optical Effects in Multifunctional Materials

Author

Xu, Hengxing

Subjects
Magneto-optical effects, Up-conversion, Graphene, Metal halide perovskite, Spin-orbital coupling, Polarization
Abstract

Multi-functional materials system such as: two-photon absorption based up-conversion crystals, magnetic/semiconducting hybrid 2D nanoparticles, and hybrid perovskites, have attracted significant research interest due to their exceptional magnetic-electronic-optical properties. However, the study on magneto-optical properties at room temperature with low field in these novel multi-functional materials are still lacking. The fundamental studies on the underlying mechanism of magneto-optical phenomenon based on excited states for these materials are still highly demanded. Magnetic field effects can be utilized as effective experimental tool to analyze spin-dependent processes of multi-functional materials in excited states. This thesis aims to experimentally explore spin-dependent process in excited states for multi-functional materials toward improved performance, by using magnetic field effects and polarized photoexcitation. Chapter 1 presents a basic introduction to magnetic field effects and development of metal-halide perovskites. Chapter 2 demonstrates magnetic field dependent photoluminescence based on multi-photon excitation in rare earth nanocrystals by considering the spin-dependent electric dipoles. Chapter 3 illustrates photoexcitation-controllable magnetization based on magnetic-semiconducting hybrid system by using steady-state pump-probe measurements in magnetic field. Chapter 4 studies the orbit-orbit interaction between polarized photoexcitation generated electron-hole pairs in metal halide perovskites, and its influence on spin mixing process. In chapter 5, the dipole moment effect on light emission properties of metal halide perovskite nanoparticles by using cation doping will be demonstrated. Chapter 6 summarizes a conclusion for entire studies in this dissertation.

Published
2019

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