Development and Characterization Studies of Eu3+-doped Zn2SiO4 Phosphors with Waste Silicate Sources

Omar, Nur Alia Sheh; Fen, Yap Wing; Матори, Хамирул Амин; Aziz, Sidek Hj. Abdul; Alassan, Zarifah Nadakkavil; Samsudin, Nur Farhana

doi:10.1016/j.proche.2016.03.006

Cited by 26 publications

(9 citation statements)

References 22 publications

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“…By looking at the diffraction peaks in Figure 2, it can be observed that, as the sintering temperature increases, the intensity of the XRD peak also increases. The effect of sintering has improved the crystallinity of the zinc silicate [15]. Besides, with the progression of the sintering temperature, the diffraction peaks of the zinc silicate glass-ceramics become sharper and the full width at half maxima (FWHM) is decreased.…”

Section: Discussionmentioning

confidence: 99%

“…Besides, with the progression of the sintering temperature, the diffraction peaks of the zinc silicate glass-ceramics become sharper and the full width at half maxima (FWHM) is decreased. In the XRD analysis, generally the smaller the crystallite sizes, the broader the peaks; in turn, the larger the crystallite sizes, the sharper the peaks [11,12,15]. This is because at a higher sintering temperature, the diffusion of the ions increased, hence making the crystal growth of the sample accelerated, resulting in a larger crystal being produced [12].…”

Section: Discussionmentioning

confidence: 99%

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A Study on Optical Properties of Zinc Silicate Glass-Ceramics as a Host for Green Phosphor

et al. 2020

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For the very first time, a study on the crystallization growth of zinc silicate glass and glass-ceramics was done, in which white rice husk ash (WRHA) was used as the silicon source. In this study, zinc silicate glass was fabricated by using melt–quenching methods based on the composition (ZnO)0.55(WRHA)0.45, where zinc oxide (ZnO) and white rice husk ash were used as the raw materials. The control crystallization technique was used in which the sample was sintered at 700–950 °C; then, the physical, structural, and optical properties of the glass and glass-ceramics were investigated by using a densitometer, linear shrinkage, X-ray diffraction (XRD), Fourier transform infrared radiation (FTIR), field-emission scanning electron microscopy (FESEM), and photoluminescence spectroscopy (PL). The density and linear shrinkage increased as the crystallinity increased and the XRD results showed the progression of the crystal formation, in which the sample was still in an amorphous state at 27 °C and 700 °C; the crystalline phase started at 750 °C. Based on the FTIR spectra, all samples showed sharpened absorption bands as the sintering temperature was increased, and the FESEM image showed the progression of crystal growth, indicating the formation of zinc silicate glass-ceramics. Lastly, the PL spectra emitted three emission peaks, at 529, 570, and 682 nm for the green, yellow, and red emission, respectively.

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Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

A Study on Optical Properties of Zinc Silicate Glass-Ceramics as a Host for Green Phosphor

et al. 2020

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“…It is observed that for both the crystals phase, the optical band gap value produced is decreasing with the increment of calcination temperature. This is due to higher calcination temperature will induce a red-shift of the electronic absorption edge, producing a smaller energy band gap which is associated with the crystallization process in the sample [50,55]. While, for Eu 3+ doped ZnO/Zn 2 SiO 4 composite samples, Figure 9 shows that the energy band gap value of ZnO crystal increased (3.271-4.07 eV) as the calcination temperature increased.…”

Section: Optical Band Gap Analysismentioning

confidence: 94%

“…Figure 5a shows the separated tiny particles in the structure in the sample at 600 • C of calcination temperature. As the calcination temperature increased, the surface energy in the samples also tends to become higher which caused smaller particles to fuse with the neighboring particles thus, forming larger crystallite sizes [50][51][52]. From Figure 5c, the existence of several necking-like shape particles can be seen in the sample with 800 • C calcination temperature.…”

Section: Field Emission Scanning Electron Microscope (Fesem) Analysismentioning

confidence: 94%

Influence of Calcination Temperature on Crystal Growth and Optical Characteristics of Eu3+ Doped ZnO/Zn2SiO4 Composites Fabricated via Simple Thermal Treatment Method

et al. 2021

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This research paper proposes the usage of a simple thermal treatment method to synthesis the pure and Eu3+ doped ZnO/Zn2SiO4 based composites which undergo calcination process at different temperatures. The effect of calcination temperatures on the structural, morphological, and optical properties of ZnO/Zn2SiO4 based composites have been studied. The XRD analysis shows the existence of two major phases which are ZnO and Zn2SiO4 crystals and supported by the finding in the FT-IR. The FESEM micrograph further confirms the existence of both ZnO and Zn2SiO4 crystal phases, with progress in the calcination temperature around 700–800 °C which affects the existence of the necking-like shape particle. Absorption humps discovered through UV-Vis spectroscopy revealed that at the higher calcination temperature effects for higher absorption intensity while absorption bands can be seen at below 400 nm with dropping of absorption bands at 370–375 nm. Two types of band gap can be seen from the energy band gap analysis which occurs from ZnO crystal and Zn2SiO4 crystal progress. It is also discovered that for Eu3+ doped ZnO/Zn2SiO4 composites, the Zn2SiO4 crystal (5.11–4.71 eV) has a higher band gap compared to the ZnO crystal (3.271–4.07 eV). While, for the photoluminescence study, excited at 400 nm, the emission spectra of Eu3+ doped ZnO/Zn2SiO4 revealed higher emission intensity compared to pure ZnO/Zn2SiO4 with higher calcination temperature exhibit higher emission intensity at 615 nm with 700 °C being the optimum temperature. The emission spectra also show that the calcination temperature contributed to enhancing the emission intensity.

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“…Due to the large amount of energy needed to produce silica from quartz and sodium carbonate, researchers are aiming to develop alternatives to fabricate ZnO-SiO 2 by using environmentally friendly silica sources [22][23][24]. OPEFB is envisaged as an alternative for the extraction of silica to produce novel ZnO-SiO 2 materials.…”

Section: Introductionmentioning

confidence: 99%

Synthesis and Characterization of ZnO-SiO2 Composite Using Oil Palm Empty Fruit Bunch as a Potential Silica Source

et al. 2021

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In this paper, the structural and optical properties of ZnO-SiO2-based ceramics fabricated from oil palm empty fruit bunch (OPEFB) were investigated. The OPEFB waste was burned at 600, 700 and 800 °C to form palm ash and was then treated with sulfuric acid to extract silica from the ash. X-ray fluorescence (XRF) and X-ray diffraction (XRD) analyses confirmed the existence of SiO2 in the sample. Field emission scanning electron microscopy (FESEM) showed that the particles displayed an irregular shape and became finer after leaching. Then, the solid-state method was used to produce the ZnO-SiO2 composite and the samples were sintered at 600, 800, 1000, 1200 and 1400 °C. The XRD peaks of the Zn2SiO4 showed high intensity, which indicated high crystallinity of the composite. FESEM images proved that the grain boundaries were larger as the temperature increased. Upon obtaining the absorbance spectrum from ultraviolet–visible (UV–Vis) spectroscopy, the energy band gaps obtained were 3.192, 3.202 and 3.214 eV at room temperature, 600 and 800 °C, respectively, and decreased to 3.127, 2.854 and 2.609 eV at 1000, 1200 and 1400 °C, respectively. OPEFB shows high potential as a silica source in producing promising optical materials.

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Development and Characterization Studies of Eu3+-doped Zn2SiO4 Phosphors with Waste Silicate Sources

Cited by 26 publications

References 22 publications

A Study on Optical Properties of Zinc Silicate Glass-Ceramics as a Host for Green Phosphor

A Study on Optical Properties of Zinc Silicate Glass-Ceramics as a Host for Green Phosphor

Influence of Calcination Temperature on Crystal Growth and Optical Characteristics of Eu3+ Doped ZnO/Zn2SiO4 Composites Fabricated via Simple Thermal Treatment Method

Synthesis and Characterization of ZnO-SiO2 Composite Using Oil Palm Empty Fruit Bunch as a Potential Silica Source

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