Natthakridta Chanthima

Spectroscopic Properties and Judd-Ofelt Analysis of Dy3+ in Lithium Lanthanum Borate Glass for Laser Medium Application

Dysprosium doped lithium lanthanum borate glasses (LiLaB:Dy3+) were prepared by the melt quenching technique, varying the Dy2O3 doped concentration from 0.00 to 1.50 mol%. The absorption spectra showed that LiLaB:Dy3+ glass absorbed photon in visible light and near infrared region. From the excitation of 388 nm, this glass emitted the photon with 483, 575, 664 and 753 nm wavelength. The intensity of emission increased with increasing of Dy2O3 concentration until 1.0 mol%, after that it decreased. The Judd-Ofelt (J-O) analysis was applied to 1.0 mol% doped glass to investigate the J-O parameter, radiative transition possibility and stimulated emission cross section. These values were interpreted to the ability of laser gain medium.

Visible Luminescence of Pr3+ in Bismuth Borate Glasses

Visible luminescence of Pr3+ ions in bismuth borate glasses doped with difference concentration of Pr2O3 have been studies. The glasses of composition 30Bi2O3 : (70-x)B2O3 : xPr2O3 (where x = 0.0, 0.5, 1.0, 1.5, 2.0 and 2.5 mol%) were prepared by the melt quenching technique. The spectral properties were investigated using the absorption and emission measurement. These glasses have shown emission and excitation bands in visible region. The emission band of Pr3+ doped glass centered at 600 nm (1D23H4), 642 nm (3P03F2) and 704 nm (3P03F3) have been observed with 469 nm (3H43P1) excitation wavelength. The excitation band revealed centered at 447, 469 and 482 nm corresponding to the 3H43P2, 3P1 and 3P0 transitions, respectively.

Preparation and Properties of Er3+ Doped with Bi2O3-BaO-B2O3 Glass

Er2O3-doped Bi2O3BaOB2O3 glasses were prepared by the conventional melt-quenching method. The glasses of the composition (in mol%) (40-x)B2O3:40Bi2O3:20BaO:xEr2O3 (where x = 0.00, 0.50, 1.00, 1.50, 2.00 and 2.50) were prepared by the melt quenching method. The density and molar volume measurements were carried out at room temperature. Absorption spectra were investigated in the UVVISNIR region from 300 to1800 nm. The upconversion photoluminescence spectra were observed in the visible region.

Optical Properties and White Emission from Dy3+ Doped in Y2O3-CaO-SiO2-B2O3 Glasses

The Dy3+ doped Y2O3-CaO-SiO2-B2O3 glasses with molar composition 25Y2O3 : 10CaO : 10SiO2 : (55-x)B2O3, where x is 0.0 to 0.5 mol%, have been prepared by melt quenching method and are characterized through absorption, photoluminescence and decay analysis. From the luminescent spectra, observed a strong yellow and blue emission from 4F9/2→ 6H13/2 (575 nm) and 4F9/2 → 6H15/2 (482 nm) transition of Dy3+ ions respectively. The tunable white light emission at different excitation wavelengths are investigated through CIE 1931 diagram. The decay curves show the decreasing of lifetimes when addition of Dy2O3 concentration.

Radiation Shielding Properties of BaO-ZnO-B2O3 Glass for X-Ray Room

This study is to find a parameters that necessary for fabricating a radiation shielding glass in x-ray room. In this study, we performed a comparison of commercial lead glass product commercial window, and developed lead-free glass in the composition of xBaO:20ZnO:(80-x)B2O3 which are applied used for lead glass replacement. The result found that, the linear attenuation coefficients (m) were increased with the increase of BaO concentrations and the decrease of an x-ray tube voltage. The developed glass samples were investigated in terms of half value layer (HVL) and mean free path (MFP) that found to be decreased with the increase of BaO concentrations which the good characteristics for application in a x-ray shielding glass manufacturing.

Effect of Eu3+ Ions on the Physical, Optical and Luminescence Properties of Aluminium Phosphate Glasses

The physical, optical and luminescence properties of lithium aluminium phosphate glasses different doping europium oxide have been investigated to evaluate their properties for solid-state lighting applications. The density and molar volume measurements were carried out at room temperature. The absorption spectra were investigated in the UV-Vis-NIR region from 250 to 2500 nm. The emission spectra, excited with 394 nm excitation wavelength showed four emission transitions corresponding to 5D0→7F1 (591 nm), 5D0→7F2 (612 nm), 5D0→7F3 (648 nm) and 5D0→7F4 (698 nm). The optimal concentration of Eu2O3 in lithium aluminium phosphate glasses was 1.00 mol%.

Investigation of Luminescence Properties of Dy3+ Doped Alkaline Earth Oxides Barium Phosphate Glasses

In this work, the optical and luminescence properties of Dy2O3 doped barium phosphate glass with different alkaline earth oxides (MgO, CaO and SrO) have been investigated. The glass samples were prepared by the melt-quenching technique at the melting temperature of 1200 °C. The absorption spectra of glasses were recorded in the ultraviolet, visible and near infrared (UV-Vis-NIR) region. The absorption bands centered at 385, 424, 452, 472, 754, 803, 901, 1093, 1273 and 1683 nm, respectively have been observed. The emission spectra of glass samples centered at 482, 574, 662 and 751 nm, respectively have been observed with 350 nm excitation wavelength. The result of radioluminescence spectra were slightly different with photoluminescence spectra. The coordinate of emitting color (x, y) for 350 excitation wavelength is 0.3781 and 0.4252, respectively which is located in white light region of CIE diagram.

Investigations on Luminescence Properties of Ce3+ Ion Doped Bismuth Borophosphate Glasses

Bismuth borophosphate glasses containing different doping cerium oxide have been synthesized at 1200 °C by melt-quenching technique. The doping concentration of the Ce3+ was varied from 0.05 mol% to 2.0 mol%. The glass samples were characterized through optical absorption and luminescence spectral measurements. UV-visible and near infrared absorption spectra of glass samples were not observed nevertheless the absorption edge was shift to the longer wavelength. The photoluminescence and radioluminescence spectra show emission bands around 367 nm under 317 nm excitation wavelength. Also, the highest emission intensity was found at 0.5 mol% CeF3 dopant for both of photoluminescence and radioluminescence.

The Study of Physical and Optical Properties of Barium Borophosphate Glasses

This research reports on the physical and optical properties of three series of borophosphate glasses combined with barium oxide (BaO), following BaBP-A, BaBP-B and BaBP-C, that were prepared by a melting and quenching process. The density, molar volume, refractive index and absorption spectra were investigated the effect of BaO on different glass structures. The results show that the densities and refractive index of the glass samples increased as the BaO (BaBP-A and BaBP-B) and B2O3 (BaBP-C) mole percentage increased. The molar volume of the glasses shows the adversative trend as the density: the molar volume decreased as the BaO and B2O3 content increased. The absorption spectra of all glass samples were slightly shifted to the longer wavelength, ultraviolet 250-350 nm, with increasing the concentration of BaO.

Total and Partial Photon Interactions of BaSO4-Na2O-B2O3-SiO2

The radiation parameters of barite sodium silicoborate glass (BaSO4:Na2O:SiO2:B2O3) with different concentration of barite (BaSO4) were studied. The mass attenuation coefficient (μ/ρ), effective atomic number (Zeff) effective electron densities (Ne,eff) and half value layer (HVL) have been calculated by theoretical approach using WinXCom program in the energy range of 1 keV to 100 GeV. The results of these parameters are show graphically for total and partial photon interaction. It was found that the Zeff show discontinuous jumps related to absorption edges and dominance photoelectric effect at low energies, pair production have two types which are nuclear and electron field and its slightly increased with increasing photon energies. The variation of Ne,eff was related to the value of Zeff. The half value layer (HVL) of glasses were compared with commercial window and some standard shielding concretes which observed that the value of 20 mol% BaSO4 has lower than commercial window, ordinary and hematite-serpentine concretes. These results showed that glass sample is promising radiation shielding materials.