Kitipun Boonin

Physical, Structural and Luminescence Properties of ZnO-Bi2O3-B2O3 Glass System

The ZnO-Bi2O3-B2O3 (ZBB) glasses with different concentrations of Bi2O3 have been prepared by a conventional melt quenching technique and investigated the effect of Bi2O3 on the physical, structural and luminescence properties. The density and hardness of glasses are also measured and found to increase with increase of Bi2O3 concentration. The IR studies indicate that these glasses are made up of [BiO3], [BO3], [BO4] and [B basic structural units. From optical spectra, the cut-off wavelengths were shifted from 423 nm to 447 nm as the content of Bi2O3 increases from 15 to 30 mol%. The photoluminescence spectra exhibit characteristic peaks at 602 nm corresponding to 3P11S0 transitions of Bi3+. The decay time for 3P1 level of Bi3+ increases with increase of Bi2O3 concentration.

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.

Physical and Optical Properties of Ce3+ Doped in Bismuth Borate Glass

Bismuth borate glasses doped with cerium in the composition 50Bi2O3:(50-x)B2O3:xCeF3 were prepared for the composition range 0x2.5 (in mol%). The glass samples have been fabricated by the conventional melt quenching technique. The physical and optical properties of glass samples were investigated. The optical absorption spectra of the glasses have been measured in the wavelength range 190-1100 nm and no absorption peak was obtained in this region. The absorption spectra of all samples were shifted to longer wavelength with increasing of CeF3 concentrations. Optical band gap decreased and refractive index increased with increasing of CeF3 concentrations.

Optical Investigation of Bi2O3-B2O3 Glass System

Glasses with composition xBi2O3:(100-x)B2O3 with 30x70 (in mol%) have been prepared using the normal melt-quench technique and investigated their properties. The optical absorption spectra of the glasses have been measured in the wavelength range 400-700 nm. It has been found that, the fundamental absorption edge has been identified from the optical absorption spectra. The values of optical band gap were decreased and the molar volumes were increased, with the addition of Bi2O3, due to the formulation of non-bridging oxygen (NBOs).

White Light Emission from Dy3+ Doped Zinc Bismuth Borate and Bismuth Borate Glasses: A Comparative Study

In this study, the effect of zinc bismuth borate (ZBB) glass and bismuth borate glass (BB) doped with trivalent dysprosium ion were investigated. Glass were prepared by the conventional melt quenching technique, with the chemical composition of (60-x) B2O3: 30Bi2O3: 10ZnO: xDy2O3 and (70-x) B2O3: 30Bi2O3: xDy2O3 where x = 1.0 mol %. The results show the densities of glasses are 3.91 g/cm3(ZBB) and 4.24 g/cm3 (BB), respectively. The absorption spectra consists of six absorption bands that are located at 752, 796, 902, 1096, 1276 and 1681 nm, and are assigned to 6H15/2 to 6F3/2,6F5/2, 6F7/2, 6H7/2+6F9/2, 6F11/2+6H9/2 and 6H11/2 transitions. The emission spectra exhibited three emission bands corresponding to the 4F9/2 → 6H15/2 (483 nm; blue), 4F9/2 → 6H13/2 (575 nm; yellow) and 4F9/2 → 6H11/2 (664 nm; red) transitions. The lifetime for 4F9/2 → 6H13/2 transition are 0.178 ms (ZBB) and 0.420 ms (BB). Both of Dy3+ in ZBB and BB glasses have been show white emission and illustrated by CIE 1931 chromaticity coordinates.

Optical and Luminescence Characteristic of Dy3+ Doped ZnO-Bao-TeO2 Glass System

Properties of Dy3+ doped ZnO-BaO-TeO2 (ZBaT) glass systems with composition 15ZnO-5BaO-(80-x)TeO2-xDy2O3 was measured for the composition range 1x8 (in mol%). The glasses were prepared by normal melt quenching technique and characterized their physical, optical and photoluminescence properties. The optical absorption spectra show peaks at 4I15/2 (466 nm), 4F9/2 (475 nm), 6F3/2 (756 nm), 6F5/2 (804 nm), 6F7/2+ 6H5/2 (904 nm), 6F9/2+ 6H7/2 (1096 nm), 6F11/2 +6H9/2 (1280 nm) and 6H11/2 (1640 nm), reflecting the Dy3+ in glass matrices. From the excitation spectra, five obvious excitation peaks were observed as follows: The ground state 6H15/2 to the excited states 4M7/2 + 6P7/2 (351nm), 4I11/2 (366 nm), 4I13/2 + 4F7/2 (385 nm), 4G11/2 (426 nm) and 4I15/2 (450 nm) of Dy3+. The emission band at 484, 575 and 661 nm arising from the transition 4F9/26H15/2, 4F9/26H13/2 and 4F9/26H11/2 respectively were observed when the sample was excited by xenon flash lamp at 450 nm. The ZBaT glass doped with 1 mol% of Dy3+ gives the highest result for luminescence properties.

Effect of Addition TiO2 on Bi2O3-TiO2-B2O3 Glasses

Bismuth titanium borate glasses in compositions xTiO2 : (30-x)Bi2O3 : 70B2O3 (with x is in mol%, varying from 0% to 10%) were fabricated by the conventional melt quenching technique. The effect of TiO2 on the physical and spectroscopic properties of bismuth borate glasses have been carried out by means of density and UV-Visible spectroscopy measurement techniques. The density and molar volume of all glasses are found to change depend on TiO2 substitution. The fundamental absorption edges for all glasses have been identified using the theory proposed by Davis and Mott. The optical band gap (Eg) is found to decrease with increase in TiO2 content.

Photon Interactions Study of Bi2O3-Na2O-CaO-SiO2-B2O3 Glasses

The Bi2O3 doped with soda lime borosilicate glasses in composition xBi2O3 : 15Na2O : 10CaO : 20B2O3 : (55-x)SiO2 at different concentrations (x = 0, 5, 10, 15, 20, 25 mol%) were studied the photon interactions. The total mass attenuation coefficient, coherent, incoherent, photoelectric absorption and pair production of prepared were studies using WinXcom Program at 1keV to 2MeV. The result of total mass attenuation coefficient and photoelectric absorption were decreases but discontinue because of photoelectric absorption edge at low energy. The photoelectric effect shows the main interaction at the low energy and decrease with increasing of photon energy. The higher photon energy the incoherent scattering found to be the main interaction. But at the photon energy 1.022 MeV, the pair production will be occurs and found to be the main interaction at the photon energy higher than 1.022 MeV.

Fabrication and Properties of Pr3+-Doped Lithium Gadolinium Borate Glasses

Pr3+-doped Li2O – Gd2O3 – B2O3 glasses (LGBO glass) with the formula 60Li2O:10Gd2O3:(30-x)B2O3:xPrO3 were fabricated using melt quenching technique. The five glass samples with different concentrations of Pr2O3 were prepared under atmospheric pressure. The samples were investigated on their properties: absorption and photoluminescence. All absorption bands are increase with increasing of Pr3+ content. The emission spectra were measured with 446 nm light pumped by xenon lamp. The maximum luminescence intensity was observed at x = 0.50 mol% andthe CIE color coordinates showed the bluish purple emission light for this concentration.

Luminescence Characteristics of Li2O3:Gd2O3:B2O3:Dy2O3 Glasses System

Melt quenching technique have been used to prepare the dysprosium-doped lithium-gadolinium borate glasses, which have the composition [60Li2O:10Gd2O3:(30-x) B2O3:xDy2O3] (LGBO:Dy3+), under atmospheric pressure. Some properties: density, molar volume, absorption spectra and photoluminescence of the LGBO:Dy3+ glasses were investigated and discussed. The density of glasses drops to the minimum point at 0.05 mol% and swings after that point. The molar volume of the glasses does not depend on Dy2O3concentration. In absorption spectra for the range of visible to near infrared wavelengths, there are 5 obvious peaks indicating the Dy3+ in glass network. The intensity of each peak at certain wavelength increases with concentration of the Dy2O3. Whereas the excitation spectra show 7 obvious peaks representing the transitions from the ground state 6H15/2to various excited states. The Xenon compact arc lamps were used to measure the emission spectra with 388 nm light. As the result, the LGBO:Dy3+ glass sample with 0.50 mol% of Dy3+ shows the highest intensity in the emission spectra.