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Azman K.,Universtiti Technology Pahang | Azhan H.,Universtiti Technology Pahang | Syamsyir S.Y.S.,Universtiti Technology Pahang | Mardhiah A.,Universtiti Technology Pahang | Nasuha M.R.S.,University Technology of MARA
Materials Science Forum | Year: 2016

Many trivalent rare earth ions such as Er3+, Tm3+, Ho3+, Pr3+ and Nd3+ were doped as absorption and emission centers in glass hosts. In this work, lead borotellurite (PBT) glass doped with neodymium ion (Nd3+) has been prepared and characterized by mean of their optical properties. The UV-Vis measurement has been carried out in order to determine the optical band gap energy, reflective indices and the polarizability. Optical absorption spectra of the glass samples are recorded in the range 400–900 nm at room temperature From the result, there are six significant absorption peaks that corresponds to 525 nm, 584 nm, 683 nm, 747 nm, 805 nm and 878 nm wavelength have been observed with the most predominant peak to be used as excitation wavelength is found centered at 584 nm. The energy band gaps as well as the refractive indices were found to vary from 2.50eV to 2.59eV and from 1.89 to 1.96 with mol% of Nd content respectively. Meanwhile, the polarizability shows a similar trend of results to refractive indices as it varies from 5.56 x 10-24 cm3 to 5.63 x 10-24 cm3. These results will be discussed further in details. © 2016 Trans Tech Publications, Switzerland. Source


Nurbaisyatul E.S.,University Technology of MARA | Azman K.,Universtiti Technology Pahang | Azhan H.,Universtiti Technology Pahang | Noranizah A.,University Technology of MARA
Advanced Materials Research | Year: 2013

Erbium doped borotellurite glass has been identified as one of the most potential candidate for optical applications due to their excellent in physical and chemical properties. Therefore, the aim of this study is to identify the optical properties by mean of their UV-Vis and photoluminescence spectroscopic of the Er3+ doped borotellurite glass. In this work, erbium doped borotellurite glass, (80-x)TeO2-10B2O3-10PbO-xEr2O3, where 0.5 mol %≤x≤2.0 mol % has been successfully fabricated by using melt-quenched techniques. The glass obtained is in good quality since it shows no sign of devitrification. The glass sample has undergone some physical and optical measurements. From the XRD results, it confirms that the glass is in amorphous nature. Meanwhile, it is found that the density of the glass sample increases from 4.4187 gcm-3 to 4.5769 gcm-3 with respect to Er content. For the optical properties, the absorption spectra were measured by UV-Vis-NIR spectrophotometer in the range 400-900 nm interval. From the absorption spectra, the 650 nm excitation wavelength is found to be the most predominant peaks. From the photoluminescence spectra, five significant emission peaks have been observed where by four of them is in the visible regions which is corresponds to 440 nm, 486 nm, 520 nm and 650 nm wavelength while the other one is in NIR regions at 794 nm. Some other results were also been analyzed and presented. © (2013) Trans Tech Publications, Switzerland. Source


Nurbaisyatul E.S.,University Technology of MARA | Azman K.,Universtiti Technology Pahang | Azhan H.,Universtiti Technology Pahang | Razali W.A.W.,Universtiti Technology Pahang | And 3 more authors.
Optics and Spectroscopy (English translation of Optika i Spektroskopiya) | Year: 2014

Erbium doped borotellurite glass has been fabricated by using conventional melting method. The density and molar volume have been calculated and analyzed while their optical properties were studied by measuring the optical absorption and luminescence spectra at room temperature. From the XRD results, since the patterns do not exhibit any diffraction line thus it confirms their amorphous nature. It is found that the density of the glass samples increased and the molar volume decreased with respect to Er ions content. Meanwhile, the upconversion emissions centered at 487, 523, 558, 642, 695 and 782 nm have been observed under the 650 nm excitation in the 4 F 9/2 level. Some other results will be analysed and discussed in details. © 2014 Pleiades Publishing, Ltd. Source


Mardhiah A.,Universtiti Technology Pahang | Shafieza S.N.E.,National University of Malaysia | Azman K.,Universtiti Technology Pahang | Azhan H.,Universtiti Technology Pahang
Materials Science Forum | Year: 2016

Borate is one of the most popular oxide glass being used in glass research world wide. Due to good reputation, therefore lead sodium borate glasses with compositions (90 - x) B2O3 + 10ZnO + xPbO (where |= 15, 20, 25, 30 and 35 mol %) have been prepared by using meltquenching method. In this work, their physical and structural properties with respect to PbO content has been investigated. The densities of these glass samples were increased from 3946.2 kg/m3 to 5107.2 kg/m3 with an increase in PbO concentration. The molar volume are found to vary from 23.78 × 10-6 m3mol-1 to 24.39 × 10-6 m3mol-1 with respect to PbO content as well. The density and molar volume show inversed result respectively. The FTIR spectral analysis indicates that with the addition of PbO contents in the glass network, structural units of BO3 are transformed in BO4. There are no sharp peaks were observed in XRD patterns of the glass samples which confirmed the amorphous nature of the glass. Meanwhile, the micro hardness of these glass samples were also increased from 189 Pa to 355 Pa with increases on PbO content. The results will be discussed and presented in details. © 2016 Trans Tech Publications, Switzerland. Source


Noranizah A.,University Technology of MARA | Azman K.,Universtiti Technology Pahang | Azhan H.,Universtiti Technology Pahang | Nurbaisyatul E.S.,University Technology of MARA | Mardhiah A.,Universtiti Technology Pahang
Jurnal Teknologi (Sciences and Engineering) | Year: 2014

This work focuses on the spectroscopic study of RE3+ion, namely, trivalent neodymium (Nd3+) doped lead borotellurite glass with a composition of TeO2-B2O3-PbO. The glass sample has been prepared by conventional melt-quenching technique. The density, molar volume and optical energy band gap of these glasses have been measured. The refractive index, molar refraction and polarizability of oxide ion have been calculated by using Lorentz-Lorentz relations. The absorption spectra are recorded using UV-VisNIR spectrometer in the range of 200-900 nm. © 2014 Penerbit UTM Press. All rights reserved. Source

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