Electronic structure and optical properties of 2,5,8,11-tetra-tert-butylperylene polyhedral crystals from x-ray absorption near-edge structure and x-ray excited optical luminescence studies

2011 ◽  
Vol 98 (24) ◽  
pp. 243106 ◽  
Author(s):  
Jingyu Lv ◽  
Peter J. Y. Ko ◽  
Ying Zhang ◽  
Lijia Liu ◽  
Xiujuan Zhang ◽  
...  
Keyword(s):  
Optical Properties ◽  
Electronic Structure ◽  
Edge Structure ◽  
X Ray ◽  
Optical Luminescence ◽  
X Ray Absorption

Origin of luminescence from ZnO/CdS core/shell nanowire arrays

Nanoscale ◽  
2014 ◽  
Vol 6 (16) ◽  
pp. 9783-9790 ◽  
Author(s):  
Zhiqiang Wang ◽  
Jian Wang ◽  
Tsun-Kong Sham ◽  
Shaoguang Yang
Keyword(s):  
Optical Properties ◽  
Chemical Imaging ◽  
Nanowire Arrays ◽  
Nano Composites ◽  
Core Shell ◽  
Edge Structure ◽  
X Ray ◽  
Optical Luminescence ◽  
Scanning Transmission ◽  
X Ray Absorption

Chemical imaging, electronic structure and optical properties of ZnO/CdS nano-composites have been investigated using scanning transmission X-ray microscopy (STXM), X-ray absorption near-edge structure (XANES) and X-ray excited optical luminescence (XEOL) spectroscopy.

Electronic structure of TiO2 nanotube arrays from X-ray absorption near edge structure studies

2009 ◽  
Vol 19 (37) ◽  
pp. 6804 ◽  
Author(s):  
J. G. Zhou ◽  
H. T. Fang ◽  
J. M. Maley ◽  
M. W. Murphy ◽  
J. Y. Peter Ko ◽  
...  
Keyword(s):  
Electronic Structure ◽  
Tio2 Nanotube Arrays ◽  
Tio2 Nanotube ◽  
Nanotube Arrays ◽  
Edge Structure ◽  
X Ray ◽  
X Ray Absorption

X-ray absorption spectroscopy and density functional analysis of the Fe3+ distribution profile on Al sites in a chrysoberyl crystal, BeAl2O4:Fe3+

2016 ◽  
Vol 49 (2) ◽  
pp. 385-388 ◽  
Author(s):  
Kanokwan Kanchiang ◽  
Atipong Bootchanont ◽  
Janyaporn Witthayarat ◽  
Sittichain Pramchu ◽  
Panjawan Thanasuthipitak ◽  
...  
Keyword(s):  
Optical Properties ◽  
Absorption Spectroscopy ◽  
Density Functional ◽  
Density Functional Theory Calculations ◽  
Distribution Profile ◽  
Laser Applications ◽  
Edge Structure ◽  
X Ray ◽  
Site Distribution ◽  
X Ray Absorption

Chrysoberyl is one of the most interesting minerals for laser applications, widely used for medical purposes, as it exhibits higher laser performance than other materials. Although its utilization has been vastly expanded, the location of transition metal impurities, especially the iron that is responsible for chrysoberyl's special optical properties, is not completely understood. The full understanding and control of these optical properties necessitates knowledge of the precise location of the transition metals inside the structure. Therefore, synchrotron X-ray absorption spectroscopy (XAS), a local structural probe sensitive to the different local geometries, was employed in this work to determine the site occupation of the Fe3+ cation in the chrysoberyl structure. An Fe K-edge X-ray absorption near-edge structure (XANES) simulation was performed in combination with density functional theory calculations of Fe3+ cations located at different locations in the chrysoberyl structure. The simulated spectra were then qualitatively compared with the measured XANES features. The comparison indicates that Fe3+ is substituted on the two different Al2+ octahedral sites with the proportion 60% on the inversion site and 40% on the reflection site. The accurate site distribution of Fe3+ obtained from this work provides useful information on the doping process for improving the efficiency of chrysoberyl as a solid-state laser material.

Electronic structure study of liquid germanium based on x-ray-absorption near-edge structure spectroscopy

1999 ◽  
Vol 59 (3) ◽  
pp. 1571-1574 ◽  
Author(s):  
Chenxi Li ◽  
Kunquan Lu ◽  
Yuren Wang ◽  
Kozaburo Tamura ◽  
Shinya Hosokawa ◽  
...  
Keyword(s):  
Electronic Structure ◽  
Structure Study ◽  
Edge Structure ◽  
X Ray ◽  
X Ray Absorption

Local electronic structure of ZnS and ZnSe doped by Mn, Fe, Co, and Ni from x-ray-absorption near-edge structure studies

1996 ◽  
Vol 53 (3) ◽  
pp. 1119-1128 ◽  
Author(s):  
K. L/awniczak-Jabl/onska ◽  
R. J. Iwanowski ◽  
Z. Gol/acki ◽  
A. Traverse ◽  
S. Pizzini ◽  
...  
Keyword(s):  
Electronic Structure ◽  
Edge Structure ◽  
X Ray ◽  
Local Electronic Structure ◽  
X Ray Absorption

Electronic Structure of P-Doped ZnO Films with p-Type Conductivity

2006 ◽  
Vol 6 (11) ◽  
pp. 3422-3425
Author(s):  
Veeramuthu Vaithianathan ◽  
Jong Ha Moon ◽  
Chang-Hwan Chang ◽  
Kandasami Asokan ◽  
Sang Sub Kim
Keyword(s):  
Electronic Structure ◽  
Xanes Spectrum ◽  
Sharp Decrease ◽  
Zno Films ◽  
Charge Neutrality ◽  
Edge Structure ◽  
X Ray ◽  
Doped Zno ◽  
P Type ◽  
X Ray Absorption

The electronic structure of laser-deposited P-doped ZnO films was investigated by X-ray absorption near-edge structure spectroscopy (XANES) at the O K-, Zn K-, and Zn L3-edges. While the O K-edge XANES spectrum of the n-type P-doped ZnO demonstrates that the density of unoccupied states, primarily O 2p–P 3sp hybridized states, is significantly high, the O K-edge XANES spectrum of the p-type P-doped ZnO shows a sharp decrease in intensity of the corresponding feature indicating that P replaces O sites in the ZnO lattice, and thereby generating PO. This produces holes to maintain charge neutrality that are responsible for the p-type behavior of P-doped ZnO. Both the Zn K-, and Zn L3-edge XANES spectra of the P-doped ZnO reveal that Zn plays no significant role in the p-type behavior of ZnO:P.

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