In this study, the authors attempted to propose the very first study on fabrication and characterization of zinc-boro-silicate (ZBS) glass-ceramics derived from the ternary zinc-boro-silicate (ZnO)0.65(B2O3)0.15(RHA)0.2 glass system through a conventional melt-quenching method by incorporating rice husk ash (RHA) as the silica (SiO2) source, followed by a sintering process. Optimization of sintering condition has densified the sintered samples while embedded beta willemite (β-Zn2SiO4) and alpha willemite (α-Zn2SiO4) were proven in X-ray diffraction (XRD) analysis. Field emission scanning electron microscopy (FESEM) has shown the distribution of willemite crystals in rhombohedral shape crystals and successfully form closely-packed grains due to intense crystallization. The photoluminescence (PL) spectra of all sintered ZBS glasses presented various emission peaks at 425, 463, 487, 531, and 643 nm corresponded to violet, blue, green, and red emission, respectively. The correlation between the densification, phase transformation, microstructure, and photoluminescence of Zn2SiO4 glass-ceramic phosphor is discussed in detail.
In this current study, the behavior of dysprosium oxide (Dy 2 O 3 ) doped willemite glass-ceramic (WGC) derived from ZnO-B 2 O 3 -RHA: Dy 2 O 3 glasses and rice-husk ash (RHA) works as the active alternative silica has been studied. The fusions of the ternary host system of oxide components doped with rare earth oxide go through the melt-quench technique followed by solid-state sintering on the compacted glass frits. The sintered green samples are characterized utilizing the physical, structural, and optical properties to investigate the effect of different sintering temperatures on the samples accordingly. The bulk density of WGC increases together with the increment of sintering temperature from 2.571 to 2.940 g cm -3 . Meanwhile, the increment of sintering temperature escalates the crystallization of the main crystalline phase, Zn 2 SiO 4 , corroborated by the enlargement of average crystallite size from 161 to 550 nm. Furthermore, the emission activity in the WGC also intensifies on the green emission region (524 nm) accordingly. This fabricated Dy 3+ :WGC contributes to the nomination as the potential solid-state lighting material.
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