Search

Your search keyword '"Guo, Peijun"' showing total 306 results
Start Over Author "Guo, Peijun" Search Limiters Peer Reviewed
306 results on '"Guo, Peijun"'

1. Two-dimensional-lattice-confined single-molecule-like aggregates

Author

Wang, Kang, Lin, Zih-Yu, De, Angana, Kocoj, Conrad A., Shao, Wenhao, Yang, Hanjun, He, Zehua, Coffey, Aidan H., Fruhling, Colton B., Tang, Yuanhao, Varadharajan, Dharini, Zhu, Chenhui, Zhao, Yong Sheng, Boltasseva, Alexandra, Shalaev, Vladimir M., Guo, Peijun, Savoie, Brett M., and Dou, Letian

Published
2024
Full Text
View/download PDF

18. Broadband emission in alkali halides triggered by Sb3+ doping.

Author

Li, Yanyan, Cotlet, Mircea, Hadar, Ido, and Guo, Peijun

Subjects
ALKALI metal halides, PHOTOLUMINESCENCE, CHLORIDES, PHOSPHORS, SALT
Abstract

Broadband emission in a series of alkali chlorides are achieved by doping NaCl, KCl, and RbCl with Sb3+. These compounds show photoluminescence peaks in the visible range of 536–574 nm with long lifetimes in the microsecond range. Our findings could offer valuable insights for the development of new lead-free phosphors. [ABSTRACT FROM AUTHOR]

Published
2024
Full Text
View/download PDF

20. Shear resistance relaxation of granular materials under vibration and restricted deforming conditions.

Author

Xie, Tao, Guo, Peijun, and Stolle, Dieter

Subjects
*MATERIAL plasticity, *DEFORMATIONS (Mechanics), *STRENGTH of materials
Abstract

The phenomenon of vibration-induced shear resistance relaxation (ViSRR) refers to the loss of shear resistance in granular materials subjected to vibration, without an observable increase of excess pore pressure, under restricted deforming conditions. Essentially, ViSRR occurs when the total deformation of granular materials is unable to keep up with the plastic deformation induced by the vibration, given the restricted deforming conditions. In this study, ViSRR is investigated through a series of specially designed experiments together with theoretical simulation based on the extended shear transformation zone (STZ) model developed for granular materials. The results demonstrate that ViSRR takes place in granular materials under monotonic shearing when the vibration is superimposed, and the magnitude of shear resistance relaxation depends on the intensity of the vibration. The occurrence of ViSRR is subject to two fundamental prerequisites: superimposed vibration as the driving force for plastic deformation, and restricted total deformation that impedes a granular material's deformability to follow the development of plastic deformation. The simulation results obtained from the extended STZ model are in agreement with laboratory test results, indicating that the model is effective in describing the process of shear resistance relaxation and the accompanying volumetric strain during vibration. [ABSTRACT FROM AUTHOR]

Published
2024
Full Text
View/download PDF

21. Thermal transport in metal halide perovskites and other third-generation photovoltaic materials.

Author

Chen, Du, Li, Shunran, Li, Bowen, and Guo, Peijun

Abstract

Third-generation photovoltaic materials, including metal halide perovskites (MHPs), colloidal quantum dots (QDs), copper zinc tin sulfide (CZTS), and organic semiconductors, among others, have become attractive in the past two decades. Unlike their first- and second-generation counterparts, these advanced materials boast properties beyond mere photovoltaic performance, such as mechanical flexibility, light weight, and cost-effectiveness. Meanwhile, these materials possess more intricate crystalline structures that aid in understanding and predicting their transport properties. In particular, the distinctive phonon dispersions in MHPs, the layered architecture in quasi-two-dimensional (2D) perovskites, the strong quantum confinement in QDs, and the complex crystal structures interspersed with abundant disorders in quaternary CZTS result in unique and sometimes anomalous thermal transport behaviors. Concurrently, the criticality of thermal management in applications such as photovoltaics, thermoelectrics, light emitting diodes, and photodetection devices has received increased recognition, considering that many of these third-generation photovoltaic materials are not good thermal conductors. Effective thermal management necessitates precise measurement, advanced modeling, and a profound understanding and interpretation of thermal transport properties in these novel materials. In this review, we provide a comprehensive summary of various techniques for measuring thermal transport properties of these materials and discuss the ultralow thermal conductivities of three-dimensional (3D) MHPs, superlattice-like thermal transport in 2D perovskites, and novel thermal transport characteristics inherent in QDs and CZTS. By collecting and comparing the literature-reported results, we offer a thorough discussion on the thermal transport phenomenon in these materials. The collective understanding from the literature in this area, as reviewed in this article, can provide guidance for improving thermal management across a wide spectrum of applications extending beyond photovoltaics. [ABSTRACT FROM AUTHOR]

Published
2024
Full Text
View/download PDF

23. Pencil–paper on-skin electronics

Author

Xu, Yadong, Zhao, Ganggang, Zhu, Liang, Fei, Qihui, Zhang, Zhe, Chen, Zanyu, An, Fufei, Chen, Yangyang, Ling, Yun, Guo, Peijun, Ding, Shinghua, Huang, Guoliang, Chen, Pai-Yen, Cao, Qing, and Yan, Zheng

Published
2020

26. Development of extended STZ model for granular soils subjected to combined static loading and vibration.

Author

Xie, Tao, Guo, Peijun, and Stolle, Dieter

Subjects
*SHEAR (Mechanics), *SHEAR strain, *AMORPHOUS substances, *SOIL granularity, *MATERIAL plasticity
Abstract

The 'shear-transformation zone' (STZ), which may be referred to as a weak domain in granular material, is the main source of plastic deformations in non-cohesive soils such as sand or gravel. To theoretically investigate the vibration-induced shear resistance reduction (ViSRR) of granular materials, in this paper an extended STZ model is proposed that considers the coupling effect between vibration and quasi-static loadings. The framework of the model consists of three components: (a) the motion of STZs including the transition, creation and destruction of STZs; (b) the relation between the motion of small-scale STZs and the observable, macroscopic plastic strain; and (c) the evolution law of a 'configurational temperature' that reflects the energy that drives the motion of STZs. The conventional STZ model developed for amorphous materials is enhanced to accommodate both volumetric and shear deformations in the spatial stress state. Specifically, in addition to considering plastic shear strains induced by the change in STZ orientation as the result of the transition, as in conventional STZ models, the extended STZ model correlates plastic volumetric strains with the change in STZ amount resulted from creation and destruction. [ABSTRACT FROM AUTHOR]

Published
2024
Full Text
View/download PDF

33. Buckling and twisting of advanced materials into morphable 3D mesostructures

Author

Zhao, Hangbo, Li, Kan, Han, Mengdi, Zhu, Feng, Vázquez-Guardado, Abraham, Guo, Peijun, Xie, Zhaoqian, Park, Yoonseok, Chen, Lin, Wang, Xueju, Luan, Haiwen, Yang, Yiyuan, Wang, Heling, Liang, Cunman, Xue, Yeguang, Schaller, Richard D., Chanda, Debashis, Huang, Yonggang, Zhang, Yihui, and Rogers, John A.

Published
2019

Catalog

Books, media, physical & digital resources
See catalog results