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< Page ,Total 16 >
The synthesis of hierarchically meso-macroporus aluminum nitrides microparticles via aluminum alloy nitridization EI SCIE Scopus
期刊论文 | 2017 , 186 , 271-273 | MATERIALS LETTERS | IF: 2.687
WoS CC Cited Count: 1
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Abstract :

in the paper, for the first time, the synthesis of aluminum nitrides microparticles with a hierarchically meso-macroporus structure were reported by an aluminum-magnesium alloy nitridization routine. The hierarchically meso-macroporous aluminum nitrogen with a specific surface area of 97.7 m(2)/g and a specific mesopore volume of 0.10 cm(3)/g was prepared by nitriding an aluminum-magnesium alloy with diameters between 75 mu m and 150 mu m at the temperature 500 degrees C for 8 h firstly, and then 800 degrees C for 6 h.

Keyword :

Semiconductors Metals and alloy Porous materials Aluminum nitrides

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GB/T 7714 Yan, Guojun , Cun, Minmin , Li, Meng et al. The synthesis of hierarchically meso-macroporus aluminum nitrides microparticles via aluminum alloy nitridization [J]. | MATERIALS LETTERS , 2017 , 186 : 271-273 .
MLA Yan, Guojun et al. "The synthesis of hierarchically meso-macroporus aluminum nitrides microparticles via aluminum alloy nitridization" . | MATERIALS LETTERS 186 (2017) : 271-273 .
APA Yan, Guojun , Cun, Minmin , Li, Meng , Wang, Liyi , Chen, Guangde , Hui, Chunli et al. The synthesis of hierarchically meso-macroporus aluminum nitrides microparticles via aluminum alloy nitridization . | MATERIALS LETTERS , 2017 , 186 , 271-273 .
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Non-Hermitian shortcut to adiabaticity of two- and three-level systems with gain and loss SCIE
期刊论文 | 2017 , 71 (1) | EUROPEAN PHYSICAL JOURNAL D | IF: 1.393
WoS CC Cited Count: 3
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Abstract :

Achieving effectively adiabatic dynamics in finite time is a ubiquitous goal in virtually all fields of modern physics. So-called shortcuts to adiabaticity refer to a set of methods and techniques that allow us to obtain in a short time the same final state that would result from an adiabatic, infinitely slow process. In this paper we generalized the non-Hermitian shortcut method to the situation of the unbalanced gain and loss. We found that the ratio between the gain and loss can control the transfer time and may become a new freedom to speed up the adiabatic transfer process. By using two-level Landau-Zener model and Allen-Eberly model and three-level stimulated Raman adiabatic passage, we investigated the transfer processes and obtained the analytical results about the final transfer time, which are related with the parameters of the corresponding systems. It is pointed out that these processes can be implemented in many systems experimentally such as coupled optical waveguides.

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GB/T 7714 Li, Guan-Qiang , Chen, Guang-De , Peng, Ping et al. Non-Hermitian shortcut to adiabaticity of two- and three-level systems with gain and loss [J]. | EUROPEAN PHYSICAL JOURNAL D , 2017 , 71 (1) .
MLA Li, Guan-Qiang et al. "Non-Hermitian shortcut to adiabaticity of two- and three-level systems with gain and loss" . | EUROPEAN PHYSICAL JOURNAL D 71 . 1 (2017) .
APA Li, Guan-Qiang , Chen, Guang-De , Peng, Ping , Qi, wei . Non-Hermitian shortcut to adiabaticity of two- and three-level systems with gain and loss . | EUROPEAN PHYSICAL JOURNAL D , 2017 , 71 (1) .
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Excitation Dependent Phosphorous Property and New Model of the Structured Green Luminescence in ZnO SCIE PubMed Scopus
期刊论文 | 2017 , 7 | SCIENTIFIC REPORTS | IF: 4.122
WoS CC Cited Count: 6
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Abstract :

The copper induced green luminescence (GL) with two sets of fine structures in ZnO crystal has been found for several decades (i.e., R. Dingle, Phys. Rev. Lett. 23, 579 (1969)), but the physical origin of the doublet still remains as an open question up to now. In this paper, we provide new insight into the mechanism of the structured GL band in terms of new experimental findings and theoretical calculations. It is found, for the first time, that the GL signal exhibits persistent afterglow for tens of minutes after the switch-off of below-band-gap excitation light but it cannot occur under above-band-gap excitation. Such a phosphorous property may be interpreted as de-trapping and feeding of electrons from a shallow trapping level via the conduction band to the Cu-related luminescence centers where the Cu3+ ion is proposed to work as the final state of the GL emission. From first-principles calculation, such a Cu3+ ion in wurtzite ZnO prefers a high spin 3d(8) state with two non-degenerated half-filled orbitals due to the Jahn-Teller effect, probably leading to the double structures in photoluminescence spectrum. Therefore, this model gives a comprehensively new understanding on the mechanism of the structured GL band in ZnO.

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GB/T 7714 Ye, Honggang , Su, Zhicheng , Tang, Fei et al. Excitation Dependent Phosphorous Property and New Model of the Structured Green Luminescence in ZnO [J]. | SCIENTIFIC REPORTS , 2017 , 7 .
MLA Ye, Honggang et al. "Excitation Dependent Phosphorous Property and New Model of the Structured Green Luminescence in ZnO" . | SCIENTIFIC REPORTS 7 (2017) .
APA Ye, Honggang , Su, Zhicheng , Tang, Fei , Wang, Mingzheng , Chen, Guangde , Wang, Jian et al. Excitation Dependent Phosphorous Property and New Model of the Structured Green Luminescence in ZnO . | SCIENTIFIC REPORTS , 2017 , 7 .
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Enhancement of photo-response via surface plasmon resonance induced by Ag nano-particles embedded in ZnO EI SCIE Scopus
期刊论文 | 2016 , 123 , 33-37 | SOLID-STATE ELECTRONICS | IF: 1.58
WoS CC Cited Count: 4
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Abstract :

Surface plasmon resonance can be exploited to improve the performance of the photodetectors. However, it may cause the increase of dark current as a side effect. The enhancement of responsivity is highly dependent on the device structure involving SPR and the situations of the metal nano-particles. In this paper, we reported the responsivity enhancement of the ZnO UV detectors with SPR based on a structure in which Ag nano-particles are embedded in ZnO film, without the apparent increase of dark current. We found that the characteristic wavelength for SPR absorption is 380 nm, well predicted by Mie theory. And the spectral responsivity peak value increases from 472 mA/W to 10.522 A/W, by 22.3 times. The good matching between enhancement spectra and SPR absorption spectra confirms that the responsivity enhancement is resulted from SPR. Our results are of great importance in improving the photodetectors based on SPR effects, which may be widely used in light detection. (C) 2016 Elsevier Ltd. All rights reserved.

Keyword :

SPR ZnO UV detector Responsivity

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GB/T 7714 Li, Gaoming , Zhang, Jingwen , Chen, Guangde et al. Enhancement of photo-response via surface plasmon resonance induced by Ag nano-particles embedded in ZnO [J]. | SOLID-STATE ELECTRONICS , 2016 , 123 : 33-37 .
MLA Li, Gaoming et al. "Enhancement of photo-response via surface plasmon resonance induced by Ag nano-particles embedded in ZnO" . | SOLID-STATE ELECTRONICS 123 (2016) : 33-37 .
APA Li, Gaoming , Zhang, Jingwen , Chen, Guangde , Ye, Honggang , Duan, Xiangyang , Hou, Xun . Enhancement of photo-response via surface plasmon resonance induced by Ag nano-particles embedded in ZnO . | SOLID-STATE ELECTRONICS , 2016 , 123 , 33-37 .
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A novel anion interstitial defect structure in zinc-blende materials: A first-principles study SCIE Scopus
期刊论文 | 2016 , 114 (3) | EPL | IF: 1.957
WoS CC Cited Count: 1
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Abstract :

The low-formation energy structure of anion interstitial defect in zinc-blende materials is usually identified as the tetrahedron central structure where the anion interstitial atom is surrounded by four countercation atoms. A line-type anion interstitial defect structure AD(i)(l), however, is found to be lower in energy than the tetrahedron central anion interstitial defect structure by first-principles calculations. By analyzing the structural and electronical characters of this line-type defect in relative compounds of zinc-blende materials, we attribute this to the electronegativity shift trends and the bond forming, which lead to the hybridization types varying from sp(3) to sp-like and ending at sp. Copyright (C) EPLA, 2016

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GB/T 7714 Yin, Yuan , Chen, Guangde , Ye, Honggang et al. A novel anion interstitial defect structure in zinc-blende materials: A first-principles study [J]. | EPL , 2016 , 114 (3) .
MLA Yin, Yuan et al. "A novel anion interstitial defect structure in zinc-blende materials: A first-principles study" . | EPL 114 . 3 (2016) .
APA Yin, Yuan , Chen, Guangde , Ye, Honggang , Duan, Xiangyang , Zhu, Youzhang , Wu, Yelong . A novel anion interstitial defect structure in zinc-blende materials: A first-principles study . | EPL , 2016 , 114 (3) .
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First-principles study on native point defects of cubic cuprite Ag2O EI SCIE Scopus
期刊论文 | 2016 , 120 (21) | JOURNAL OF APPLIED PHYSICS | IF: 2.068
WoS CC Cited Count: 1
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Abstract :

Using the first-principles calculations, we have systematically investigated the atomic configurations, electronic structures, formation energies and transition energies of native point defects in cuprite Ag2O. Under the conditions of Ag-rich, we find that the oxygen vacancy (VO) and the oxygen interstitial (O-i) have the lowest formation energies in p-type and n-type conditions, respectively. Silver vacancy (V-Ag) acts as a shallow acceptor, which has high formation energy in p-type sample. Oxygen anti-site (O-Ag) is the most stable state and acts as an acceptor-type point defect in the O-rich conditions. Ag interstitial (Ag-i) is a shallow donor, which can be formed easily in the Ag-rich conditions. Moreover, we study the band offsets of heterojunction between Ag2O in cuprite structure and ZnO, GaN, and AlN in the wurtzite structure. These results would provide guidance for the experimental studies of point defects in cuprite Ag2O. Published by AIP Publishing.

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GB/T 7714 Yin, Yuan , Chen, Guangde , Duan, Xiangyang et al. First-principles study on native point defects of cubic cuprite Ag2O [J]. | JOURNAL OF APPLIED PHYSICS , 2016 , 120 (21) .
MLA Yin, Yuan et al. "First-principles study on native point defects of cubic cuprite Ag2O" . | JOURNAL OF APPLIED PHYSICS 120 . 21 (2016) .
APA Yin, Yuan , Chen, Guangde , Duan, Xiangyang , Ye, Honggang , Jin, Wentao , Zhu, Youzhang et al. First-principles study on native point defects of cubic cuprite Ag2O . | JOURNAL OF APPLIED PHYSICS , 2016 , 120 (21) .
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Image recombination transform algorithm for superresolution structured illumination microscopy EI SCIE PubMed Scopus
期刊论文 | 2016 , 21 (9) | JOURNAL OF BIOMEDICAL OPTICS | IF: 2.53
WoS CC Cited Count: 4
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Abstract :

Structured illumination microscopy (SIM) is an attractive choice for fast superresolution imaging. The generation of structured illumination patterns made by interference of laser beams is broadly employed to obtain high modulation depth of patterns, while the polarizations of the laser beams must be elaborately controlled to guarantee the high contrast of interference intensity, which brings a more complex configuration for the polarization control. The emerging pattern projection strategy is much more compact, but the modulation depth of patterns is deteriorated by the optical transfer function of the optical system, especially in high spatial frequency near the diffraction limit. Therefore, the traditional superresolution reconstruction algorithm for interference-based SIM will suffer from many artifacts in the case of projection-based SIM that possesses a low modulation depth. Here, we propose an alternative reconstruction algorithm based on image recombination transform, which provides an alternative solution to address this problem even in a weak modulation depth. We demonstrated the effectiveness of this algorithm in the multicolor superresolution imaging of bovine pulmonary arterial endothelial cells in our developed projection-based SIM system, which applies a computer controlled digital micromirror device for fast fringe generation and multicolor light-emitting diodes for illumination. The merit of the system incorporated with the proposed algorithm allows for a low excitation intensity fluorescence imaging even less than 1 W/cm(2), which is beneficial for the long-term, in vivo superresolved imaging of live cells and tissues. (C) The Authors. Published by SPIE under a Creative Commons Attribution 3.0 Unported License.

Keyword :

structured illumination superresolution fluorescence

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GB/T 7714 Zhou, Xing , Lei, Ming , Dan, Dan et al. Image recombination transform algorithm for superresolution structured illumination microscopy [J]. | JOURNAL OF BIOMEDICAL OPTICS , 2016 , 21 (9) .
MLA Zhou, Xing et al. "Image recombination transform algorithm for superresolution structured illumination microscopy" . | JOURNAL OF BIOMEDICAL OPTICS 21 . 9 (2016) .
APA Zhou, Xing , Lei, Ming , Dan, Dan , Yao, Baoli , Yang, Yanlong , Qian, Jia et al. Image recombination transform algorithm for superresolution structured illumination microscopy . | JOURNAL OF BIOMEDICAL OPTICS , 2016 , 21 (9) .
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Ternary mixed crystal effects on interface optical phonon and electron-phonon coupling in zinc-blende GaN/AlxGa1-xN spherical quantum dots EI SCIE Scopus
期刊论文 | 2016 , 76 , 164-168 | PHYSICA E-LOW-DIMENSIONAL SYSTEMS & NANOSTRUCTURES | IF: 2.221
WoS CC Cited Count: 2
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Abstract :

The theoretical investigations of the interface optical phonons, electron-phonon couplings and its ternary mixed effects in zinc-blende spherical quantum dots are obtained by using the dielectric continuum model and modified random-element isodisplacement model. The features of dispersion curves, electron-phonon coupling strengths, and its ternary mixed effects for interface optical phonons in a single zinc-blende GaN/AlxGa1-xN spherical quantum dot are calculated and discussed in detail. The numerical results show that there are three branches of interface optical phonons. One branch exists in low frequency region; another two branches exist in high frequency region. The interface optical phonons with small quantum number I have more important contributions to the electron-phonon interactions. It is also found that ternary mixed effects have important influences on the interface optical phonon properties in a single zinc-blende GaN/AlxGa1-xN quantum dot With the increase of Al component, the interface optical phonon frequencies appear linear changes, and the electron-phonon coupling strengths appear non-linear changes in high frequency region. But in low frequency region, the frequencies appear non-linear changes, and the electron-phonon coupling strengths appear linear changes. (C) 2015 Elsevier B.V. All rights reserved.

Keyword :

Electron-phonon interaction Quantum dot Phonon mode

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GB/T 7714 Huang, Wen Deng , Chen, Guang De , Yuan, Zhao Lin et al. Ternary mixed crystal effects on interface optical phonon and electron-phonon coupling in zinc-blende GaN/AlxGa1-xN spherical quantum dots [J]. | PHYSICA E-LOW-DIMENSIONAL SYSTEMS & NANOSTRUCTURES , 2016 , 76 : 164-168 .
MLA Huang, Wen Deng et al. "Ternary mixed crystal effects on interface optical phonon and electron-phonon coupling in zinc-blende GaN/AlxGa1-xN spherical quantum dots" . | PHYSICA E-LOW-DIMENSIONAL SYSTEMS & NANOSTRUCTURES 76 (2016) : 164-168 .
APA Huang, Wen Deng , Chen, Guang De , Yuan, Zhao Lin , Yang, Chuang Hua , Ye, Hong Gang , Wu, Ye Long . Ternary mixed crystal effects on interface optical phonon and electron-phonon coupling in zinc-blende GaN/AlxGa1-xN spherical quantum dots . | PHYSICA E-LOW-DIMENSIONAL SYSTEMS & NANOSTRUCTURES , 2016 , 76 , 164-168 .
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Tailoring the surface of ZnO nanorods into corrugated nanorods via a selective chemical etch method EI SCIE PubMed Scopus
期刊论文 | 2016 , 27 (29) | NANOTECHNOLOGY | IF: 3.44
WoS CC Cited Count: 6 SCOPUS Cited Count: 6
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Using the chemical vapour deposition method, we successfully converted smooth ZnO nanorods (NRs) into corrugated NRs by simply increasing the reaction time. The surface morphology and crystallographic structure of the corrugated NRs were investigated. The corrugated NRs were decorated by alternant (11 (2) over bar1) and (11 (2) over bar(1) over bar) planes at the exposed side surfaces while the conventional {10 (1) over bar0} planes disappeared. No twinning boundaries were found in the periodically corrugated structures, indicating that they were type II corrugated NRs. Further investigation told us that they were selectively etched. We introduced a hydrothermal method to synthesize the smooth ZnO NRs and then etched them in a tube furnace at 950 degrees C with a flow of carbon monoxide. By separating the growth stage and the selective etching stage, we explicitly demonstrated a successfully selective etching effect on ZnO NRs with a carbon monoxide reducing atmosphere for the first time. An etching mechanism based on the selective reaction between carbon monoxide and the different exposed surfaces was proposed. Our results will improve the understanding of the growth mechanism on coarse or corrugated NRs and provide a new strategy for the application of surface controlled nanostructured materials.

Keyword :

corrugated nanorod ZnO selective etch carbon monoxide

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GB/T 7714 Duan, Xiangyang , Chen, Guangde , Li, Chu et al. Tailoring the surface of ZnO nanorods into corrugated nanorods via a selective chemical etch method [J]. | NANOTECHNOLOGY , 2016 , 27 (29) .
MLA Duan, Xiangyang et al. "Tailoring the surface of ZnO nanorods into corrugated nanorods via a selective chemical etch method" . | NANOTECHNOLOGY 27 . 29 (2016) .
APA Duan, Xiangyang , Chen, Guangde , Li, Chu , Yin, Yuan , Jin, Wentao , Guo, Lu'an et al. Tailoring the surface of ZnO nanorods into corrugated nanorods via a selective chemical etch method . | NANOTECHNOLOGY , 2016 , 27 (29) .
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Effect of oxygen vacancy and zinc interstitial on the spontaneous polarization of wurtzite ZnO: maximally localized Wannier functions analysis EI SCIE Scopus
期刊论文 | 2015 , 70 (2) | EUROPEAN PHYSICAL JOURNAL-APPLIED PHYSICS | IF: 0.667
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First-principles calculations are employed to obtain the maximally localized Wannier functions of wurtzite ZnO with O vacancy and Zn interstitial. Through analyzing the shape of Wannier functions and the distribution of Wannier function centers, the influence of O vacancy and Zn interstitial in different charge states on the spontaneous polarization are investigated. We found that polarization appears in [(1) over bar 0 1 0] and [(1) over bar 2 (1) over bar 0] orientations when the defects are charged, and the absolute polarization value will get larger as the defect charge state increases. Neutral O vacancy decreases the spontaneous polarization along the [0 0 0 1] direction. For O vacancy in +1 and +2 charge states, an additional electronic field is introduced, and it results in a dramatic change in the electronic structure, which reverses the polarization. However, in the case of Zn interstitial in +2 charge state, we find that it is the ionic relaxation that plays a dominant role in the polarization reversal.

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GB/T 7714 Niu, Haibo , Chen, Guangde , Wu, Yelong et al. Effect of oxygen vacancy and zinc interstitial on the spontaneous polarization of wurtzite ZnO: maximally localized Wannier functions analysis [J]. | EUROPEAN PHYSICAL JOURNAL-APPLIED PHYSICS , 2015 , 70 (2) .
MLA Niu, Haibo et al. "Effect of oxygen vacancy and zinc interstitial on the spontaneous polarization of wurtzite ZnO: maximally localized Wannier functions analysis" . | EUROPEAN PHYSICAL JOURNAL-APPLIED PHYSICS 70 . 2 (2015) .
APA Niu, Haibo , Chen, Guangde , Wu, Yelong , Zhu, Youzhang , Shao, Li , Ye, Honggang . Effect of oxygen vacancy and zinc interstitial on the spontaneous polarization of wurtzite ZnO: maximally localized Wannier functions analysis . | EUROPEAN PHYSICAL JOURNAL-APPLIED PHYSICS , 2015 , 70 (2) .
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