Sains Malaysiana 44(9)(2015): 1357–1362

Photoluminescence Characteristic of Magnesium Boro-Tellurite doped Eu³⁺ Ceramic

(Ciri Fotoluminesens bagi Magnesium Boro-Telurit dop Seramik Eu³⁺)

NUR ZU IRA BOHARI¹, R. HUSSIN¹*, ZUHAIRI IBRAHIM¹ & HENDRIK O. LINTANG²

¹Phosphor Research Group, Department of Physics, Faculty of Science, University Teknologi Malaysia, 81310 Skudai, Johor Darul Takzim, Malaysia

²Ibnu Sina Institute for Fundamental Science Studies, 81310 Skudai, Johor Darul Takzim, Malaysia

Diserahkan: 23 Oktober 2014/Diterima: 5 Mei 2015

ABSTRACT

The series samples of xTeO₂-(70-x)B₂O₃-30MgO with 0≤x≤30 mol% have been prepared via the solid-state reaction method. The composition sample of 30TeO₂-40B₂O₃-30MgO were chosen as a doped sample in the composition of 100-y(30TeO₂-40B₂O₃-30MgO)-yEu³⁺ with 0.2≤y≤2 mol% and were heated at 750^oC. The XRD results showed that the major phase was Mg(Te₂O₅) while MgO(B₂O₃)2, MgTe₆O₁₃, Mg2(B₂O₅) and MgB₄O₇ was observed as a minor phase. The small phase of EuB₂O₄ and Eu₂Te₄O11 were detected by XRD when the composition of 30TeO₂-40B₂O₃-30MgO were doped with 1.5% of Eu³⁺. The EDX analysis of 30TeO₂-40B₂O₃-30MgO doped with 1.5% Eu³⁺ sample was confirmed the presence of boron (B), magnesium (Mg), tellurium (Te), oxygen (O) and europium (Eu) elements. From the FESEM images, the surface morphology of doped 1.5% Eu³⁺ samples was agglomerated compared with the undoped sample. The average diameter of the grain size is in the range of 50-100 μm. The emission spectra of the Eu³⁺-doped 30TeO₂-40B₂O₃-30MgO ceramic consists of intense and sharp lines ranging from 550-725 nm. The luminescence spectra showed that the emission intensity of 30TeO₂-40B₂O₃-30MgO doped with Eu³⁺ was enhanced with the increase of Eu³⁺ ion from 0.2 to 1.5 mol%, which resulted in enhancement of the red emission of the samples. The longest decay time for 30TeO₂-40B₂O₃-30MgO doped with 1.5 mol % Eu³⁺ was 0.892 ms.

Keywords: Decay curve; magnesium boro-tellurite; photoluminescence

ABSTRAK

Siri sampel bagi xTeO₂-(70-x)B₂O₃-30MgO dengan 0≤x≤30 mol% telah disediakan melalui kaedah tindak balas keadaan pepejal. Sampel dengan komposisi 30TeO₂-40B₂O₃-30MgO telah dipilih sebagai sampel dop berkomposisi 100-y(30TeO₂-40B₂O₃-30MgO)-yEu3+ dengan 0.2≤y≤2 mol% dan telah dipanaskan pada suhu 750^oC. Keputusan XRD menunjukkan fasa major adalah Mg(Te₂O₅) manakala MgO(B₂O₃)2. MgTe₆O₁₃, Mg₂(B₂O₅) and MgB₄O₇ dilihat sebagai fasa minor. Fasa yang kecil bagi Dy(BO₂)3, Dy₂Te₄O11, EuB₂O₄ and Eu₂Te₄O₁₁ telah dikesan oleh XRD pada komposisi 30TeO₂-40B₂O₃-30MgO dop 1.5% Eu³⁺. Analisis EDX bagi sampel 30TeO₂-40B₂O₃-30MgO dop 1.5% Eu³⁺ menunjukkan unsur boron (B), magnesium (Mg), telurium (Te), oksigen (O) dan europium (Eu). Daripada imej FESEM, morfologi permukaan bagi sampel dop adalah bergumpal berbanding dengan sampel tidak didop. Diameter purata bagi saiz butiran adalah dalam lingkungan 50-100 μm. Spektrum pancaran bagi Eu³⁺-dop 30TeO₂-40B₂O₃-30MgO seramik terdiri garisan yang jelas dan tajam pada julat 550-725 nm. Spektra luminesens menunjukkan keamatan pancaran bagi 30TeO₂-40B₂O₃-30MgO dop dengan Eu³⁺ meningkat dengan peningkatan ion Eu³⁺ daripada 0.2 ke 1.5 mol%, menunjukkan peningkatan pancaran merah pada sampel tersebut. Masa pereputan yang paling lama apabila didopkan dengan 1.5 mol% Eu³⁺ pada komposisi 30TeO₂-40B₂O₃-30MgO adalah 0.892 ms.

Kata kunci: Fotoluminesens; lengkung pereputan; magnesium boro-telurit

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*Pengarang untuk surat-menyurat; email: roslihussin@utm.my