Article
Materials Science, Multidisciplinary
Rui Zhang, Yaoxin Yuan, Jianfeng Zhang, Haiyun Liu, Gang Chen, Kun Li, MengQing Hong, Wenbin Zuo, Chunlan Wang, Wen Yang, Zhenxing Qin
Summary: The Mn-doped perovskite CsPb(Cl/Br)(3) nanocrystals with NiCl2 doping can enhance the Mn2+ emission by providing enough halide ions and passivating defect states in the perovskite NCs. The Density Functional Theory (DFT) calculations confirm that Ni2+ doping can eliminate deep defects in the CsPb(Cl/Br)(3) nanocrystals, improving the stability of the perovskite NCs against electron beam irradiation.
JOURNAL OF MATERIALS SCIENCE
(2021)
Article
Chemistry, Multidisciplinary
Saptarshi Mandal, Swarnali Ghosh, Soumen Mukherjee, Chayan K. De, Debjit Roy, Tridib Samanta, Prasun K. Mandal
Summary: With an increasing bromide content in CsPb(Br/Cl)(3) perovskite nanocrystals (PNCs), various parameters including photoluminescence quantum yield, band edge population, hot exciton trapping time, ON fraction distribution peak, and detrapping rate compared to trapping rate have shown significant increases. Standardized measurements and analyses were conducted to ensure consistency in the results obtained for all three PNCs.
Article
Materials Science, Multidisciplinary
Yuxiao Geng, Bobo Yang, Mingming Shi, Jun Zou
Summary: The study reported a strategy for synthesizing MnCl2-doped CsPbBr3 nanocrystals, successfully adjusting their optical properties and achieving double emission nanocrystals with tunable spectra. After testing, it was found that the luminescence mechanism of Mn2+ doped perovskite quantum dots changed, emitting orange yellow light with a maximum PLQY of 45.2%.
Article
Multidisciplinary Sciences
E. Kirstein, N. E. Kopteva, D. R. Yakovlev, E. A. Zhukov, E. V. Kolobkova, M. S. Kuznetsova, V. V. Belykh, I. A. Yugova, M. M. Glazov, M. Bayer, A. Greilich
Summary: The spin dynamics and interaction of confined electrons or holes in perovskite nanocrystals are investigated using time resolved optical spectroscopy. Spin mode locking effect and nuclear focusing are observed in CsPb(Cl0.56Br0.44)(3) lead halide perovskite nanocrystals embedded in a glass matrix. The measured spin coherence time and spin dephasing time are 13 ns and a nanosecond respectively, and the developed theoretical model agrees well with the experimental data.
NATURE COMMUNICATIONS
(2023)
Article
Chemistry, Physical
Yonghua Chen, Yanbo Zhang, Liang Bao, Wenqiang Liu, Yang Zhang
Summary: The incorporation of silver nanoparticles (NPs) into cesium lead mixed-halide perovskite nanocrystals (NCs) was found to significantly enhance the blue emission intensity and photoluminescence quantum yield (PLQY). However, an excessive amount of silver NPs may reduce the quantum yield of blue emission. Overall, optimization of the size and quantity of Ag NPs can improve the efficiency of blue emission from CsPb(Br/Cl)3 NCs.
JOURNAL OF PHYSICAL CHEMISTRY C
(2021)
Article
Chemistry, Multidisciplinary
Vasilii V. Belykh, Mikhail L. Skorikov, Evgeniya V. Kulebyakina, Elena V. Kolobkova, Maria S. Kuznetsova, Mikhail M. Glazov, Dmitri R. Yakovlev
Summary: Lead halide perovskite nanocrystals in a glass matrix show excellent optical properties and stability, making them a promising platform for optoelectronic applications. By studying the electron spin properties of these nanocrystals, we uncover their potential for spintronics.
Article
Engineering, Environmental
Le Ma, Xiansheng Li, Xuehan Chen, Jingyu Li, Pengfei Liu, Changting Wei, Qingshan Ma, Leimeng Xu, Wenhua Zhang, Jizhong Song
Summary: Introducing tetra-n-octylammonium oxalate (TOAOxa) to modify CsPb(Br/Cl)3 quantum dots (QDs) improves their water-resistance stability and luminescence performance, which could advance the development of blue light quantum dot technology.
CHEMICAL ENGINEERING JOURNAL
(2023)
Article
Materials Science, Ceramics
Xizhen Zhang, Mengqi Lin, Linke Song, Sai Xu, Yichao Wang, Jinsu Zhang, Baojiu Chen
Summary: We fabricated CsPb(Cl/Br)(3) quantum dots (QDs) and Tb3+ co-doping glass to investigate temperature sensing using fluorescence intensity ratio (FIR), full width at half maximum (FWHM), lifetime, and chromatic coordinate. Temperature dependent photoluminescence (PL) spectra were measured and evaluated. The FIR and chromatic coordinate modes showed high sensitivity and the FIR mode had better absolute and relative sensitivity, while the chromatic coordinate mode had a good linear relationship. repeatability of all four sensing modes was excellent due to QDs-Tb3+ co-doping glass stability.
CERAMICS INTERNATIONAL
(2023)
Article
Chemistry, Multidisciplinary
Chen Zhang, Minqiang Wang, Jindou Shi, Junnan Wang, Zheyuan Da, Yun Zhou, Youlong Xu, Nikolai V. Gaponenko, Arshad Saleem Bhatti
Summary: In this study, CsPb(Cl/Br)(3) nanocrystals were grown in-situ in TiO2 hollow shells doped with Eu3+ ions using a modified thermal injection method to prepare CsPb(Cl/Br)(3)/TiO2:Eu3+ composites with direct excitation of white light without additional treatment. The composites showed bright white light emission, high luminous efficiency of 87.39 lm/W, and long-time operating stability, providing new options for the development of perovskite devices.
FRONTIERS IN CHEMISTRY
(2023)
Article
Optics
Kewei Ma, Yuhang Sheng, Guizhen Wang, Xiaowei Zhang, Yunsong Di, Cihui Liu, Liyan Yu, Lifeng Dong, Zhixing Gan
Summary: Mn2+ doping in CsPbCl3 perovskite quantum dots affects their photoluminescence, with stable properties observed at certain doping concentrations. Anion exchange reactions between stable CsPb0.796Mn0.204Cl3 and CsPbBr3 PQDs result in a wide fluorescence color gamut for Mn:CsPb(Cl/Br)3 PQDs.
JOURNAL OF LUMINESCENCE
(2022)
Article
Materials Science, Multidisciplinary
Siyuan Fu, Panpan Li, Yongmin Duan, Xiaoqing Liu, Shiqing Xu, Junjie Zhang
Summary: By introducing MgO and adjusting the ratio of Cl/Br, self-crystallized CsPbCl3-XBrX PeQDs with tunable blue-green spectra have been successfully prepared, providing a more energy-efficient method for synthesis.
JOURNAL OF MATERIALS CHEMISTRY C
(2023)
Article
Chemistry, Physical
Hyejin Choe, Ho Jin, Seon Joo Lee, Junsang Cho
Summary: Leadhalide perovskite nanocrystals doped with Mn2+ dopants offer the ability to modulate the optoelectronic and magnetic properties, but understanding and predicting the Mn sensitization is challenging due to the complex interactions between excitons and dopants. In this study, machine learning-directed models were created to navigate the complex energy transfer in Mn-doped CsPb(Cl1-y Br y )(3) nanocrystals with different Mn concentrations and halide compositions. The models revealed that forward exciton-to-Mn energy transfer is influenced by Mn concentration, while backward Mn-to-exciton energy transfer depends on the energy gap between the exciton and Mn states. This approach provides insight into complex physical phenomena and allows efficient navigation of the reaction design space.
CHEMISTRY OF MATERIALS
(2023)
Article
Polymer Science
Saif M. H. Qaid, Hamid M. Ghaithan, Huda S. Bawazir, Abdullah S. Aldwayyan
Summary: Perovskite-type lead halides show promise in optoelectronic applications, especially in laser technology. However, their poor chemical and colloidal stability at the nanoscale limits further device development. Bulk perovskites, on the other hand, have potential as optical amplifiers. Material development is crucial for achieving high photoluminescence quantum yields and optical gains.
Article
Materials Science, Multidisciplinary
Runda Guo, Weizhuo Zhang, Xin Li, Linyuan Lian, Hongting Chen, Chencheng Peng, Liang Sun, Shiyuan Liu, Jianbing Zhang, Lei Wang
Summary: A new strategy of using strontium halides and amine halides for simultaneous doping and surface passivation of CsPb(Br-Cl)(3) perovskite NPs is proposed, leading to the synthesis of stable blue perovskite NPs with excellent photoluminescence quantum yield (PLQY).
JOURNAL OF MATERIALS CHEMISTRY C
(2022)
Article
Chemistry, Multidisciplinary
Weizhuo Zhang, Xin Li, Chencheng Peng, Fei Yang, Linyuan Lian, Runda Guo, Jianbing Zhang, Lei Wang
Summary: In this study, colloidal cesium lead halide perovskite nanocrystals were modified with calcium halide and ammonium ions, leading to a significant enhancement of photoluminescence quantum yield. The blue-emitting perovskite nanocrystals demonstrated excellent performance in the deep blue region. Bright white emission and a wide color gamut were achieved by combining commercial red- and green-emitting phosphors.
Article
Computer Science, Information Systems
Elahe Nasiri, Kamal Berahmand, Yuefeng Li
Summary: Link prediction is a widely studied problem in complex network analysis. The existing methods often overlook the potential of nodal attributes and only focus on the network's topological structure. To address this limitation, a novel method called RGNMF-AN was proposed, which models both the topological structure and nodal attributes for link prediction. The method combines network topology and nodal attribute information and calculates high-order proximities using the SARWS method. Empirical findings on real-world complex network datasets show that the combination of attributed and topological information significantly improves prediction performance compared to baseline and other NMF-based algorithms.
MULTIMEDIA TOOLS AND APPLICATIONS
(2023)
Article
Oncology
Caicun Zhou, Dingzhi Huang, Yun Fan, Xinmin Yu, Yunpeng Liu, Yongqian Shu, Zhiyong Ma, Ziping Wang, Ying Cheng, Jie Wang, Sheng Hu, Zhihua Liu, Elena Poddubskaya, Umut Disel, Andrey Akopov, Mikhail Dvorkin, Wenjuan Zheng, Yiyuan Ma, Yan Wang, Songzi Li, Cunjing Yu, Gareth Rivalland
Summary: This article reports the results of the RATIONALE-303 trial, which investigated the efficacy and safety of tislelizumab versus docetaxel in pretreated patients with advanced NSCLC. The results showed that tislelizumab had a significantly improved overall survival compared to docetaxel.
JOURNAL OF THORACIC ONCOLOGY
(2023)
Article
Engineering, Electrical & Electronic
Zhongyao Cao, Yue Li, Zhijun Zhang, Magdy F. Iskander
Summary: This article proposes a mechanically reconfigurable 1-D reflectarray that is actuated by a single motor. The reflectarray consists of metal tubes lifted by ejectors, and utilizes the discontinuity of the Archimedean spiral to achieve continuous phase growth. A novel drive mechanism, consisting of Archimedean spiral cams and followers, is designed to convert the motor rotation to linear motion of the elements. The reflectarray, supported by low-cost acrylic plates, achieved a beam steering range of -60 degrees to 60 degrees in one dimension at 5 GHz and showed a significant improvement in the received signal level in a multipath environment.
IEEE TRANSACTIONS ON ANTENNAS AND PROPAGATION
(2023)
Article
Engineering, Electrical & Electronic
Weiquan Zhang, Yue Li, Kunpeng Wei, Zhijun Zhang
Summary: This paper presents two dual-band back-to-back planar inverted-F antennas (PIFAs) for WLAN applications, which can simultaneously radiate at the 2.4 GHz and 5 GHz bands by etching a slot on the PIFA. A decoupling process using long and short slots on the ground is discussed to reduce mutual coupling. The fabricated and measured antennas show good coverage of the 2.4 and 5 GHz WLAN bands with isolation improved to higher than 20 dB at both bands.
IEEE TRANSACTIONS ON ANTENNAS AND PROPAGATION
(2023)
Article
Optics
Wendi Yan, Ziheng Zhou, Hao Li, Wangyu Sun, Qihao Lv, Yue Li
Summary: Different from classical periodic-resonator-based metamaterials, epsilon-near-zero (ENZ) metamaterials achieve equivalent electromagnetic characteristics in deep subwavelength scales. By substituting dielectric dopants with metal-layer dopants, a dielectric-free approach is used to construct a low-loss resonant cavity, enabling the largest tuning range of the effective permeability mu(eff). The low-loss benefits of layer-type ENZ metamaterials are demonstrated in integrated microfluidic switches and high-sensitivity sensors, showing universal significance for wide-range applications in extreme-small-volume devices and systems.
LASER & PHOTONICS REVIEWS
(2023)
Article
Engineering, Electrical & Electronic
Xiaopeng Zhang, Dawei Zhou, Shichao Li, Yue Li, Kunpeng Wei, Zhijun Zhang
Summary: A high-gain, broadband, and +/- 45 degrees polarized patch antenna array for Wi-Fi 6/6E application with a simple configuration is proposed. The antenna is composed of a substrate board and a metal layer, with all patches and feeding circuits printed on the bottom surface of the board. T-shaped dipoles driven by parallel dual lines are used to excite the patches, and their parameters are designed to achieve broadband coverage of both 5 and 6 GHz bands of Wi-Fi 6/6E. A prototype is fabricated and tested, showing measured bandwidth and gains in agreement with simulated results. The proposed antenna offers advantages in high gain, low cost, and easy processing compared to other unidirectional antennas.
IEEE ANTENNAS AND WIRELESS PROPAGATION LETTERS
(2023)
Article
Engineering, Electrical & Electronic
Weihao Diao, Yue Li, Zhijun Zhang
Summary: In this paper, an antenna design for unmanned aerial vehicles with a null-filled axisymmetric secant-square-shaped beam is proposed. The antenna consists of four monopoles with sequentially rotated feed and a coupling-fed grooved circular patch. The radiation power ratio is utilized for beam shaping, and the ground effect is also examined. A prototype is manufactured to validate the proposed method and antenna performance. The gain curves of the antenna align well with the secant-squared curve in the 0 to 60 degree range, with an RMSE below 1.35 dB at 5.5-5.7 GHz.
IEEE ANTENNAS AND WIRELESS PROPAGATION LETTERS
(2023)
Article
Engineering, Electrical & Electronic
Weiquan Zhang, Yue Li, Kunpeng Wei, Zhijun Zhang
Summary: This article presents a compact multiple-input-multiple-output (MIMO) microstrip antenna system that covers the 2.4 and 5 GHz wireless local area network (WLAN) bands. The dual-band characteristics are achieved by exciting the TM01 and TM03 modes of a microstrip antenna, using a rectangular slot to improve the radiation capability of the TM03 mode, and utilizing two probes to tune the resonant frequency of the TM01 mode. High interport isolation at the two WLAN bands is achieved through isolation enhancement at the lower and upper-frequency bands, introducing split loops to reduce mutual coupling at the 2.4 GHz band, and adding dipole elements in the rectangular slot for high isolation at the 5 GHz band. The proposed antenna system operates at 2.25-2.63 and at 5.14-6.06 GHz, with measured maximum mutual coupling of less than -15.3 dB at both operating frequency bands.
IEEE TRANSACTIONS ON ANTENNAS AND PROPAGATION
(2023)
Article
Engineering, Electrical & Electronic
Zhongyao Cao, Jiadong Hu, Yue Li, Kunpeng Wei, Zhijun Zhang, Magdy F. Iskander
Summary: A compact reconfigurable element-based 360 degrees azimuth scanning array is proposed for aviation applications. The reconfigurable Yagi-Uda element is constructed by combining a driven element and two switchable parasitic elements. The array can switch the radiation pattern to two broadside states in two directions and an endfire state. The measured results of the prototype indicate a wide scanning range and high gain with a small cross-sectional area. This work provides a compact reconfigurable antenna with full 360 degrees coverage for aviation applications and has the potential to promote future anti-interference array designs.
IEEE TRANSACTIONS ON ANTENNAS AND PROPAGATION
(2023)
Article
Engineering, Electrical & Electronic
Shan Gao, Le Chang, Anxue Zhang, Yue Li, Zhijun Zhang
Summary: This article addresses the issue of exact coverage problem of unbalanced Wi-Fi 6 bands by engineering the TM0.5,0 and TM0.5,1 modes of the half-mode patch while maintaining small volume. The design guideline includes selecting proper patch size, optimizing feeding positions, and using lumped components. The proposed half-mode patch with the smallest volume among reported Wi-Fi 6 dual-band patch antennas fully covers the Wi-Fi 6 bands and suits the optimal Wi-Fi 6 RF front-end architecture.
IEEE TRANSACTIONS ON ANTENNAS AND PROPAGATION
(2023)
Article
Engineering, Electrical & Electronic
Mingzhe Hu, Yue Li
Summary: This paper proposes a wideband and low-profile microstrip antenna for MIMO applications, which simultaneously excites three modes to achieve wideband radiation. The proposed antenna has a compact size and low profile, making it suitable for 5G mobile MIMO applications.
IEEE TRANSACTIONS ON ANTENNAS AND PROPAGATION
(2023)
Article
Engineering, Electrical & Electronic
Xiaopeng Zhang, Dawei Zhou, Shichao Li, Yue Li, Zhijun Zhang
Summary: A simple approach is proposed to reshape the radiation patterns of the third mode of dipole and slot antennas by adding short parasitic strips or slots to both sides of the antennas. The reversed current or E-field in the third mode is canceled out by the induced current or E-field on the added parasitic elements, resulting in reshaped omnidirectional or bidirectional radiation patterns. The effects of parasitic element length, spacing, and position on radiation patterns have also been studied. Two prototypes with parasitic elements were fabricated and tested, validating the concept with good agreement between measured and simulated results.
IEEE TRANSACTIONS ON ANTENNAS AND PROPAGATION
(2023)
Article
Engineering, Electrical & Electronic
Weiquan Zhang, Yue Li, Kunpeng Wei, Zhijun Zhang
Summary: A compact dual-band multibeam antenna system with high gain is proposed for MIMO Wi-Fi application. The system consists of four rotationally symmetric antenna panels and two series-fed microstrip patch antenna arrays operating at the 5GHz band. Two dual-function metasurfaces are placed between the antenna arrays to improve the gain and provide 2.4GHz antenna functionality. The antenna system demonstrates 360 degrees pattern coverage in azimuth and high gain characteristics.
IEEE TRANSACTIONS ON ANTENNAS AND PROPAGATION
(2023)
Article
Nanoscience & Nanotechnology
Xu Qin, Yijing He, Wangyu Sun, Pengyu Fu, Shuyu Wang, Ziheng Zhou, Yue Li
Summary: This study investigates the concept of stepped waveguide metamaterials as low-loss effective replicas of surface plasmon polaritons (SPPs). The proposed structure maintains the same field configuration as regular SPPs but avoids inherent losses, outperforming regular low-loss SPP designs with natural plasmonic materials in terms of propagation lengths. Furthermore, the stepped waveguide metamaterial exhibits excellent compatibility in direct interconnections with arbitrary regular SPPs, potentially leading to new SPP devices with low-loss advantages.
Article
Engineering, Electrical & Electronic
Zhenyu Liu, Yijing He, Yue Li
Summary: This paper proposes a general approach to enhance the beamwidth of microstrip antennas for wide beam coverage in both E- and H-planes. By introducing vertical currents brought by capacitive metalized vias, the half-power beamwidth (HPBW) is effectively broadened compared to regular microstrip antennas. In addition, the use of low-loss air medium and two arrays of via fences allows for high radiation efficiency. A fabricated and tested prototype validates the proposed design, showing enhanced HPBWs of 100(degrees) and 90(degrees) in E- and H-planes, respectively. Compared to existing 2.4-GHz antennas, the proposed antenna offers the advantages of wide beamwidth and high radiation efficiency, making it suitable for space-limited mobile devices with wide coverage requirements.
IEEE OPEN JOURNAL OF ANTENNAS AND PROPAGATION
(2023)