Photoluminescence and thermoluminescence properties of Li₂O-Na₂O-B₂O₃ glass.
Influence of Nd(3+) concentration on the optical and thermoluminescence (TL) properties of melt-annealed synthesized 10 Na2O: 20 Li2O: (70-x) B2O3 : xNd2O3, where 0.1≤ x ≤0.7 (LNB) glasses are determined. The absence of sharp peaks in X-ray diffraction patterns confirms the amorphous nature of the prepared glasses. The photoluminescence spectra under 800 nm laser excitations at room temperature exhibit three prominent peaks centred at 538, 603 and 675 nm corresponding to the transitions of (4)G(7/2) → (4)I(9/2), [(4)G(7/2) → (4)I(11/2), (4)G(5/2) → (4)I(9/2)] and [(4)G(7/2) → (4)I(13/2), (4)G(5/2) → (4)I(11/2)], respectively. The TL glow curve exhibits a prominent peak (T(m)) at 180°C. The best performance of the prepared glass was found at 0.5 mol% of Nd2O3. We achieved a good linearity of TL response against dose between 0.5 to 4.0 Gy. The calculated value of the effective atomic number, Z(eff), is 7.55 which is nearly tissue equivalent (Z(eff) = 7.42). These promising features demonstrate the capability of the aforementioned glass to be used as a radiation dosimeter.


CONCLUSIONS
The thermoluminescence and optical properties of new compositions of lithium sodium borate glasses doped with Nd(3+) ions were reported. Attractive features were obtained from the TL, PL and UV-Vis light analysis. Three upconversion luminescences permitting green, orange and red emissions were observed.
Department of Physics, Universiti Teknologi Malaysia, 81310, Skudai, Johor, Malaysia.
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Razak
Department of Physics, Universiti Teknologi Malaysia, 81310, Skudai, Johor, Malaysia.
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Hashim
Department of Physics, Universiti Teknologi Malaysia, 81310, Skudai, Johor, Malaysia.|Radiation Protection Directorate, Energy and Minerals Regulatory Commission, 11183, Amman, Jordan.
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Mhareb
Department of Physics, Faculty of Science, Universiti Putra Malaysia, 43400, UPM Serdang, Selangor, Malaysia.
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Tamchek
D001895:Boron / Q000737:chemistry*; D005898:Glass / Q000737:chemistry*; D008094:Lithium / Q000737:chemistry*; D049449:Luminescence; D010100:Oxygen / Q000737:chemistry*; D055668:Photochemical Processes; D012964:Sodium / Q000737:chemistry*; D013696:Temperature
D008094:Lithium; D012964:Sodium; D001895:Boron; D010100:Oxygen
borate glass; neodymium oxide; photoluminescence; thermoluminescence