Preparation and Luminescence Properties of ZnO–SiO2–B2O3–Na2O:Sm3+ Glass

2013 ◽  
Vol 750-752 ◽  
pp. 914-918
Author(s):  
Yong Qiang Zhang ◽  
Quan Sheng Liu ◽  
Mei Li
Keyword(s):  
High Temperature ◽  
Infrared Spectrum ◽  
Glass Matrix ◽  
Emission Spectra ◽  
Spectroscopic Properties ◽  
Molar Concentration ◽  
Luminescence Properties ◽  
Melting Method ◽  
Light Excitation ◽  
Temperature Melting

The 40ZnO-30SiO2-20B2O3-10Na2O:Sm3+ glass was prepared by high-temperature melting method. The structure and composition of the glass matrix was investigated by Infrared spectrum (IR). The absorption, excitation and emission spectra of the samples were tested, and the results showed that the glass can emit orange shade under light excitation. The emission peaks at 565nm, 604nm and 650nm wavelength were corresponding to the 4G5/26H5/2, 4G5/26H7/2 and 4G5/26H9/2 transition emission of Sm3+, while the 4G5/26H7/2 transition emission was the strongest. So the best Sm3+-doping molar concentration was 0.4%. The spectroscopic properties indicated that 40ZnO-30SiO2-20B2O3-10Na2O: Sm3+ was expected to become a new conversion material.

OPTICAL CHARACTERIZATION OF Tb3+-DOPED Gd2O3 BASED SCINTILLATING GLASSES

2013 ◽  
Vol 27 (23) ◽  
pp. 1350127
Author(s):  
FEI LAI ◽  
YUE-PIN ZHANG ◽  
HAI-PING XIA ◽  
JIN-HAO WANG ◽  
WEI HE
Keyword(s):  
High Temperature ◽  
Optical Characterization ◽  
Luminous Intensity ◽  
Luminescence Properties ◽  
Oxide Glasses ◽  
Excitation Spectra ◽  
Melting Method ◽  
Negative Effect ◽  
Temperature Melting

We prepared Tb 3+-doped Gd 2 O 3-based oxide glasses by high-temperature melting method and presented their density and optical characterization including transmission, emission and excitation spectra. Dependence of density and luminescence properties on the concentration of Tb 3+ and Gd 2 O 3 was also analyzed. The results show that rising Tb 3+ ions concentrations would lead to the reduction of distance between Tb 3+ ions, the increase of probabilities of energy resonate-transfer and a stronger luminous intensity. In addition, a high Gd 2 O 3 concentration was beneficial to improve the glass samples density, but exerting a negative effect on Tb 3+ ions and decreasing the luminous intensity of Tb 3+ ions.

Luminescence Properties of Phosphor (Sr1-xBax) 1.95 SiO4: 0.05Eu2+

2015 ◽  
Vol 815 ◽  
pp. 304-308
Author(s):  
Zi Xu Jiang ◽  
Ke Hui Qiu ◽  
Xue Guang Lu ◽  
Kun Zhao ◽  
Xia He
Keyword(s):  
Intermediate Phase ◽  
Broad Band ◽  
Emission Spectra ◽  
Luminescence Properties ◽  
X Ray Diffraction ◽  
Excitation Spectra ◽  
Barium Concentration ◽  
Light Excitation ◽  
Two Phases ◽  
Thermal Stability Of

The luminescence properties of green-yellow emitting (Sr1-xBax)1.95SiO4:0.05Eu2+ (0≤x≤1) phosphors were discussed in this paper. These phosphors were synthesized through the high temperature solid-state reaction technique and characterized by X-ray diffraction. The experimental results indicated that all the major phase of prepared phosphors gradually varied from α-Sr2SiO4 (x=0) phase to Ba2SiO4 (x=1) phase, and an intermediate phase between the two phases was observed at x=0.5. The excitation spectra (λem λem=524 nm) and emission spectra (λex λex=400 nm) showed a broad band character with peak located at 365 nm and range from 579 nm to 508 nm, respectively. With the increase of concentration of barium, the thermal stability of the phosphors increased first when x is less than 0.5, and then it decreased when x surpasses 0.5. In addition, luminescence intensity was enhanced with the barium concentration. Under the 400 nm NUV light excitation the (Sr1-xBax) 1.95SiO4:0.05Eu2+ phosphors have a potential application in white LED.

MAGNETIC BEHAVIOR OF IRON IONS IN THE P2O5·CaO GLASS MATRIX

2003 ◽  
Vol 17 (24) ◽  
pp. 1271-1275 ◽  
Author(s):  
I. ARDELEAN ◽  
C. ANDRONACHE ◽  
P. PǍŞCUŢǍ
Keyword(s):  
Magnetic Susceptibility ◽  
High Temperature ◽  
Magnetic Moment ◽  
Glass Matrix ◽  
Magnetic Behavior ◽  
Iron Ions ◽  
Ion Content ◽  
Dipole Interactions ◽  
Valence States ◽  
Temperature Susceptibility

The temperature dependence of the magnetic susceptibility of x Fe 2 O 3·(100-x)-[ P 2 O 5· CaO ] glasses with 0<x≤50 mol % have been investigated. These data revealed that the valence states and the distribution of iron ions in the glass matrix depend on the Fe 2 O 3 content. For the glasses with x≤1 mol % only Fe 3+ ions are evidenced. In the case of the glasses with 3≤x≤35 mol % both Fe 3+ and Fe 2 ions co-exist in the P 2 O 5· CaO glass matrix, the Fe 2+ ion content is higher than that of the Fe 3+ ions for glasses with x≥10 mol %. For the glasses with x>35 mol %, the evaluated values of the μ eff indicate either the presence of Fe + ions or the coordination influence on the magnetic moment of iron ions, but the presence of small quantities of the antiferromagnetic or ferrimagnetic interactions between iron ions in studied temperature range cannot be excluded. The high temperature susceptibility results indicate that the iron ions are isolated or participate in dipole-dipole interactions for glasses with x≤35 mol % and are antiferromagnetically coupled for higher contents of Fe 2 O 3.

Ultra high molecular weight polyethylene with improved plasticity and toughness by high temperature melting

Polymer ◽  
2010 ◽  
Vol 51 (12) ◽  
pp. 2721-2731 ◽  
Author(s):  
Jun Fu ◽  
Bassem W. Ghali ◽  
Andrew J. Lozynsky ◽  
Ebru Oral ◽  
Orhun K. Muratoglu
Keyword(s):  
Molecular Weight ◽  
High Temperature ◽  
High Molecular Weight ◽  
Ultra High Molecular Weight ◽  
Temperature Melting

Investigation on the Spectroscopic Properties of Yb3+-doped Phosphate Glass

2011 ◽  
Vol 335-336 ◽  
pp. 1035-1038
Author(s):  
Qi Sang ◽  
Shao Jun Wang ◽  
Xue Rong Wang ◽  
Jing Wen Lu
Keyword(s):  
Cross Section ◽  
Spectral Properties ◽  
Emission Cross Section ◽  
Emission Spectra ◽  
Spectroscopic Properties ◽  
Pump Intensity ◽  
Doping Content ◽  
Performance Parameters ◽  
Particle Count ◽  
Laser Glass

A series of the Yb3+ -doped phosphate laser glass have been prepared under high temperature and different doping content and the fluorescence and absorption spectrum is observed, respectively. The influences of the Yb3+ -doped content on the spectral properties of the glass are analyzed and the optimal mole fraction is 4 %. The emission cross-section and fluorescent lifetime is calculated with McCumber theory. Furthermore, the integrated absorption cross-section, the full width at half maximum of the emission spectra and the laser performance parameters such as least particle count, saturation pump intensity and lowest pump intensity of Yb3+ -doped laser glass is calculated.

Cubic Boron Nitride as a New Semiconductor for Optoelectronics: Luminescence Properties and Potentialities

1989 ◽  
Vol 162 ◽  
Author(s):  
Koh Era ◽  
Osamu Mishima
Keyword(s):  
High Pressure ◽  
High Temperature ◽  
Boron Nitride ◽  
Room Temperature ◽  
Cubic Boron Nitride ◽  
Visible Region ◽  
Vibrational Structure ◽  
Luminescence Properties ◽  
Optoelectronic Applications ◽  
P Type

ABSTRACTIn cubic boron nitride made by high pressure and high temperature technique in our institute, we have found three luminescence bands in the ultraviolet and the short visible region at room temperature by cathode-ray excitation. They are: a band having vibrational structure and ascribable to undoped state of the crystal, a band ascribable to p-type doping and a band ascribable to n-type doping. Discussion is made on differences between the injection luminescence and the cathodoluminescence. Potentialities and difficulties in realizing the potentialities of cBN for optoelectronic applications are discussed.

Measurements of high-temperature emission spectra of highly irradiated LiF:Mg,Cu,P (MCP-N) TL detectors

2013 ◽  
Vol 56 ◽  
pp. 183-186 ◽  
Author(s):  
W. Gieszczyk ◽  
P. Bilski ◽  
B. Obryk ◽  
P. Olko ◽  
A.J.J. Bos
Keyword(s):  
High Temperature ◽  
Emission Spectra

scholarly journals The dependence of electrophoretic and spectroscopic properties of the pyruvate dehydrogenase complex on mono- and divalent ions.

1994 ◽  
Vol 41 (1) ◽  
pp. 63-72
Author(s):  
T Pawełczyk ◽  
R A Easom ◽  
M S Olson
Keyword(s):  
Ionic Strength ◽  
Pyruvate Dehydrogenase ◽  
Pyruvate Dehydrogenase Complex ◽  
Fluorescence Emission ◽  
Emission Spectra ◽  
Spectroscopic Properties ◽  
Uv Absorption ◽  
Divalent Ions ◽  
Fluorescence Emission Spectra ◽  
Dehydrogenase Complex

The effects of various mono- and divalent ions on the pyruvate dehydrogenase complex (PDC) were investigated. To determine the radius of PDC under various conditions a two-dimensional agarose gel electrophoresis technique was used. The radius of PDC cross-linked with glutaraldehyde at ionic strength 0.04 M was calculated to be 22.0 +/- 0.1 nm. The presence of K+, Na+ or HPO4(2-) prevented changes in electromobility and of the calculated radius of PDC induced by alteration in ionic strength. The fluorescence emission spectra of PDC depended on the ionic strength and monovalent cations. The fluorescence intensity of PDC increased in the presence of 80 mM K+, and decreased in the presence of 80 mM Na+ with no shift in the emission maximum wavelength. Changes in the ionic strength to which PDC was exposed resulted in alteration of the UV absorption spectra in the 230 nm region. These alterations were prevented by HPO4(2-), whereas Na+ or K+ ions had no effect on the UV absorption spectrum of PDC.

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