Vacuum ultraviolet excitation of the 1.9-eV emission band related to nonbridging oxygen hole centers in silica

2004 ◽  
Vol 69 (15) ◽  
Author(s):  
M. Cannas ◽  
F. M. Gelardi
Keyword(s):  
Emission Band ◽  
Vacuum Ultraviolet ◽  
Nonbridging Oxygen ◽  
Ultraviolet Excitation ◽  
Oxygen Hole ◽  
Hole Centers

Defect Induced by Heated Treatment in Silica Fiber Material

2011 ◽  
Vol 304 ◽  
pp. 160-164
Author(s):  
Zhong Yin Xiao ◽  
Wen Yun Luo ◽  
Jian Xiang Wen ◽  
Jian Zhong Yin ◽  
Ting Yun Wang
Keyword(s):  
Thermal Treatment ◽  
Treatment Process ◽  
Defect Formation ◽  
Fiber Material ◽  
Nonbridging Oxygen ◽  
Pure Silica ◽  
Conversion Frequency ◽  
Oxygen Hole ◽  
Strained Bonds ◽  
Hole Centers

In this paper, defect induced by heated treatment in silica is studied. The formation process of defect is analyzed by the thermodynamic model. The results show that defect can be produced by thermal treatment process. The concentration of defect can be affected by many factors. The defect formation induced by heated treatment is related to the initial precursors. To pure silica glass, the precursors mainly come from the strained bonds of network. It can produce centers and nonbridging oxygen hole centers (NBOHCs). These defects are also related to the temperature of heated treatment and the conversion frequency between precursors and defects. The changes of defect concentration with temperature and conversion frequency are also discussed in detail.

Ultraviolet photoluminescence from nonbridging oxygen hole centers in porous silica

2001 ◽  
Vol 78 (2) ◽  
pp. 174-176 ◽  
Author(s):  
Baodian Yao ◽  
Huazhong Shi ◽  
Xinyi Zhang ◽  
Lide Zhang
Keyword(s):  
Porous Silica ◽  
Nonbridging Oxygen ◽  
Oxygen Hole ◽  
Hole Centers

Vacuum ultraviolet excitation of the 2.7eV emission band in neutron irradiated silica

2009 ◽  
Vol 355 (18-21) ◽  
pp. 1034-1037 ◽  
Author(s):  
M. León ◽  
P. Martín ◽  
R. Vila ◽  
J. Molla ◽  
A. Ibarra
Keyword(s):  
Emission Band ◽  
Vacuum Ultraviolet ◽  
Ultraviolet Excitation

Vacuum ultraviolet optical absorption band of non-bridging oxygen hole centers in SiO2 glass

2002 ◽  
Vol 122 (3-4) ◽  
pp. 117-120 ◽  
Author(s):  
Hideo Hosono ◽  
Koichi Kajihara ◽  
Takenobu Suzuki ◽  
Yoshiaki Ikuta ◽  
Linards Skuja ◽  
...  
Keyword(s):  
Absorption Band ◽  
Optical Absorption ◽  
Vacuum Ultraviolet ◽  
Sio2 Glass ◽  
Optical Absorption Band ◽  
Oxygen Hole ◽  
Hole Centers

The Effect of Electron Irradiation on the Structure of Sodium Aluminum-Iron Phosphate Glasses

MRS Advances ◽  
2016 ◽  
Vol 1 (63-64) ◽  
pp. 4227-4232 ◽  
Author(s):  
S.V. Stefanovsky ◽  
O.I. Stefanovsky ◽  
M.I Kadyko ◽  
V.A. Zhachkin ◽  
L.D. Bogomolova
Keyword(s):  
Room Temperature ◽  
Structural Evolution ◽  
Iron Phosphate ◽  
Esr Spectra ◽  
Phosphate Glasses ◽  
Water Molecules ◽  
Oxygen Hole ◽  
Bending Modes ◽  
Iron Phosphate Glasses ◽  
Hole Centers

ABSTRACTGlasses of the series (mol.%) 40 Na2O, (20-x) Al2O3, x Fe2O3, 40 P2O5 were irradiated with 8 MeV electrons to doses equivalent of 0.1, 0.5, and 1.0 MGy and characterized by FTIR spectroscopy and ESR at room temperature. FTIR spectra of all the glasses consist of strong bands due to O-P-O stretching modes in (PO4)3- and (P2O7)4- units at 1000-1200 cm-1, P-O-P stretching modes at 900-950 cm-1 (νas) and 700-750 cm-1 (νs), and bending modes in the PO4 units. The wavenumber range lower 800 cm-1 has some contribution due to stretching modes in MO4 and MO6 (M = Al, Fe) units. Moreover the bands at 3300-3700 cm-1 and 1550-1650 cm-1 due to stretching and bending modes in both absorbed and structurally bound H2O molecules were present. As irradiation dose increases the bands due to stretching and bending modes in water molecules and M-O-H bonds become stronger and are split. No essential changes with increasing dose were observed within the spectral range of stretching modes of the O-P-O and P-O-P bonds. Irradiation yields phosphorus-oxygen hole centers - PO42- (D5) and PO42- (D6), and PO32- ion-radicals (D2) observable in ESR spectra of low-Fe glasses. At x>5 their responses are overlapped with strong broad line due to Fe(III). On the whole, with the increase in iron content the glass structural evolution decrease.

A novel blue-emitting silica-coated KBaPO4:Eu2+ phosphor under vacuum ultraviolet and ultraviolet excitation

2009 ◽  
Vol 115 (1) ◽  
pp. 161-164 ◽  
Author(s):  
Won Bin Im ◽  
Hyoung Sun Yoo ◽  
Sivakumar Vaidyanathan ◽  
Ki Hyuk Kwon ◽  
Hyung Jun Park ◽  
...  
Keyword(s):  
Vacuum Ultraviolet ◽  
Ultraviolet Excitation
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