Journal ArticleDOI
Thermal, Structural, and Enhanced Photoluminescence Properties of Eu3+-doped Transparent Willemite Glass–Ceramic Nanocomposites
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In this paper, the formation of willemite crystal phase, size, and morphology with increase in heat-treatment time was examined by X-ray diffraction (XRD) and field-emission scanning electron microscopy (FESEM) techniques.Abstract:
The precursor glass in the ZnO–Al2O3–B2O3–SiO2 (ZABS) system doped with Eu2O3 was prepared by the melt-quench technique. The transparent willemite, Zn2SiO4 (ZS) glass–ceramic nanocomposites were derived from this precursor glass by a controlled crystallization process. The formation of willemite crystal phase, size, and morphology with increase in heat-treatment time was examined by X-ray diffraction (XRD) and field-emission scanning electron microscopy (FESEM) techniques. The average calculated crystallite size obtained from XRD is found to be in the range 18–70 nm whereas the grain size observed in FESEM is 50–250 nm. The refractive index value is decreased with increase in heat-treatment time which is caused by the partial replacement of ZnO4 units of ZS nanocrystals by AlO4 units due to generation of vacancies. Fourier transform infrared (FTIR) reflection spectroscopy was used to evaluate its structural evolution. Vickers hardness study indicates marked improvement of hardness in the resultant glass-ceramics compared with its precursor glass. The photoluminescence spectra of Eu3+ ions exhibit emission transitions of 5D0→7Fj (j = 0, 1, 2, 3, and 4) and its excitation spectra show an intense absorption band at 395 nm. These spectra reveal that the luminescence performance of the glass–ceramic nanocomposites is enhanced up to 17-fold with the process of heat treatment. This enhancement is caused by partitioning of Eu3+ ions into glassy phase instead of into the willemite crystals with progress of heat treatment. Such luminescent glass–ceramic nanocomposites are expected to find potential applications in solid-state red lasers, phosphors, and optical display systems.read more
Citations
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Journal ArticleDOI
Structural and emission properties of Eu3+-doped alkaline earth zinc-phosphate glasses for white LED applications
Kaushal Jha,M. Jayasimhadri +1 more
TL;DR: In this paper, a set of quaternary alkaline earth zinc-phosphate glasses in molar composition (40 − x) ZnO-35P2O5-20BaO-5TiO2- xEu2O3 (x=1 and R=Mg, Ca, Sr, and Ba) were prepared by melt quenching technique.
Journal ArticleDOI
Fabrication and enhanced photoluminescence properties of Sm3+-doped ZnO–Al2O3–B2O3–SiO2 glass derived willemite glass–ceramic nanocomposites
TL;DR: In this paper, a transparent willemite, Zn 2 SiO 4 (ZS) glass-ceramic nanocomposites were prepared from melt-quench derived ZnO-Al 2 O 3 -B 2 O3 -SiO 2 (ZABS) precursor glass by an isothermal heat-treatment process.
Glass-ceramics: A class of nanostructured materials for photonics
TL;DR: In this article, the basic characteristics of transparent glass-ceramics are introduced, with particular attention to the relationship between structure and transparency and to the mechanism of crystallization, which may also be induced by selective laser treatments.
Journal ArticleDOI
Fabrication and Crystallization of ZnO-SLS Glass Derived Willemite Glass-Ceramics as a Potential Material for Optics Applications
Mohd Hafiz Mohd Zaid,Khamirul Amin Matori,Sidek Abdul Aziz,Halimah Mohamed Kamari,Wan Mahmood Mat Yunus,Zaidan Abdul Wahab,Nur Farhana Samsudin +6 more
TL;DR: Willemite glass-ceramics were successfully derived from conventional melt-quench ZnO-SLS precursor glass by an isothermal heat treatment process as discussed by the authors, and the effect of heat treatment temperatures on the physical properties was investigated by Archimedes principle and linear shrinkage.
Journal ArticleDOI
Optical band gap and photoluminescence studies of Eu3+-doped zinc silicate derived from waste rice husks
Rahayu Emilia Mohamed Khaidir,Yap Wing Fen,Mohd Hafiz Mohd Zaid,Khamirul Amin Matori,Nur Alia Sheh Omar,Muhammad Fahmi Anuar,Siti Aisyah Abdul Wahab,Aisyah Zakiah Khirel Azman +7 more
TL;DR: In this paper, the photoluminescence and optical properties of europium doped zinc silicate glass ceramics derived from white rice husk ash as potential silica source have been done.
References
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Journal ArticleDOI
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