White-light-emitting Dy3+-doped amorphous SiO2 nanophosphors derived from rice husk

Mbakaan, C.; Ahemen, I.; Amah, A. N.; Onojah, A. D.; Koao, L.F.

doi:10.1007/s00339-018-2156-6

Cited by 16 publications

(8 citation statements)

References 31 publications

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“…The asymmetric ratio ( ) A r for Dy4, Z0.1, Z0.25, Z0.5, and Z1 samples are 1.96, 2.46, 3.05, 1.95, and 1.88, respectively. The increased value of A r suggests a higher degree of covalency between the Dy 3+ and O 2− ions, thereby increasing the interaction strength of the Dy 3+ ions with the CaMoO 4 host [61]. The A r of Z0.25 is a maximum which leads to stongest interaction between host and Dy 3+ ions.…”

Section: Optical Studymentioning

confidence: 98%

Improvement in white light emission of Dy³⁺ doped CaMoO₄ via Zn²⁺ co-doping

Dixit¹,

Pandey²,

Chauhan³

et al. 2022

Methods Appl. Fluoresc.

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The research in developing a single ingredient phosphor for white-light emission is progressively increasing. It is well known that the 4F9/2→ 6H13/2 (yellow) and 4F9/2→ 6H15/2 (blue) transitions of Dy3+ ions give near-white light emission. The white light emission of the Dy3+ ions can be enhanced by improving the crystallinity of the host phosphor via co-doping of transition metal ions. In this paper, we report a significant improvement in the white light emission of Dy3+ doped CaMoO4 by co-doping Zn2+ ions. The X ray diffraction pattern confirms the tetragonal phase of pure and doped CaMoO- 4 phosphor. The peak broadening and a red-shift in the absorption peak are observed by UV-Vis absorption analysis of Zn2+/Dy3+ doped CaMoO4. From Photoluminescence studies, we have observed that in Dy3+ doped CaMoO4, the 4% Dy3+ doped CaMoO4exhibits maximum emission. The Zn2+ ions are co-doped to further increase the luminescence intensity of CaMoO4:4%Dy3+ and the maximum luminescence is obtained for 0.25% Zn2+ concentration. Two prominent emission peaks centered at 484 nm and 574 nm related to transitionsT⃗he 4F9/2→ 6H13/2 4F9/2 6H15/2 and 4F9/2→ 6H13/2 of Dy3+ ion are observed for Dy3+ doped phosphor.transition is the forced electric dipole transition which is affected by its chemicalenvironment. After Zn2+ co-doping, the 4F9/2→ 6H13/2 transition is affected due to a change in asymmetricity around the Dy3+ ions. The 0.25% co-doping of Zn2+ gives 34% enhancement in luminescence emission of 4% Dy3+ doped CaMoO4. As a result, the CIE coordinates and color purity of the 0.25% Zn2+ co-doped CaMoO4:4Dy3+ show improvement in the overall white light emission. We have shown that with Zn2+ co-doping, the non-radiative relaxations are reduced which results in improved white light emission of Dy3+ions.

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Section: Optical Studymentioning

confidence: 98%

Improvement in white light emission of Dy³⁺ doped CaMoO₄ via Zn²⁺ co-doping

Dixit¹,

Pandey²,

Chauhan³

et al. 2022

Methods Appl. Fluoresc.

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“…3 (a), the image exhibits a resemblance to tree bark or a wooden log, suggesting the amorphous nature of the compound. Furthermore, the particles are unevenly distributed across the area, and there is noticeable surface roughness on the particles [61]. In Fig.…”

Section: Scanning Electron Microscopy (Sem)mentioning

confidence: 98%

Development of SiO2/rGO from Rice Husk for Photocatalysis, Antioxidant, Electrochemical and Green Sensor Detection Studies

Swetha,

Venkata Lakshmi,

Mylarappa

et al. 2024

Silicon

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This study reports the extraction, characterization and development of reduced graphene oxide (rGO) doped silicon dioxide (SiO2) nanocomposite by simple reflux method. The nanocomposite was confirmed by using X-ray diffraction (XRD), Fourier-transform infrared spectroscopy (FTIR), scanning electron microscopy (SEM) and UV-Visible spectroscopy techniques. The photocatalysis of malachite green (MG) was carried out for rGO, SiO2 and SiO2/rGO nanocomposite shows higher MG degradation about 97% compared to rGO, SiO2 and follows 1 st order kinetics. The antioxidant action of SiO2/rGO nanocomposite was assessed using DPPH shows a more antioxidant activity (98 %) and lower IC50 about 488.35 mg/mL. From electrochemical, the specific capacitance (Csp) value of SiO2/rGO (114 F/g) was exhibits higher compared to rGO (75 F/g) and SiO2 (96 F/g) respectively. The CV and sensor detection of bee pollen and cow urine samples were performed using nickel mesh electrode in 1M KCl in the potential range -1 to 1 V. The SiO2/rGO was employed to analyze bee pollen and cow urine concentrations and the detection limits were found to be 0.260 mM and 0.413 mM respectively. The prepared electrode plays an important role for improving sensor detection of bee pollen and cow urine samples.

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“…These findings indicate that SiO 2 :Dy 3+ nano phosphors are used in WLEDs and other advanced lighting technologies. 175 Figure 17 depicts the PL emission spectra of SiO 2 :Dy 3+ nano phosphors at various excitation wavelengths. Jinkai L et al also explored the photoluminescence emission (PLE) spectra of (Lu 1-x Gd x ) 0.975 Dy 0.025 phosphors and investigated the energy transfer from Gd 3+ →Dy 3+ and evaluated the PLE spectra at 528 nm.…”

Section: Xrd (X-ray Diffractionmentioning

confidence: 99%

“…Ultraviolet-visible spectroscopy (UV-vis).-Organic compound evaluation is becoming increasingly common owing to the extensive utilization of organic materials in pharmaceutical, clinical, industrial 175 and agricultural areas. UV-vis spectroscopic analysis is widely utilized for compound characterization and quantification of organic compounds.…”

Section: Xrd (X-ray Diffractionmentioning

confidence: 99%

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Review— On the Development of Phosphors for Luminescent Materials: Synthesis, Characterization, Applications and Evolution of Phosphors as White-Light-Emitting Diodes

Farooq,

Rafiq,

Shah

et al. 2023

ECS J. Solid State Sci. Technol.

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The manuscript focuses on the concept of nano-phosphors, a remarkable type of material that has been widely explored because of their diverse promising applications. Progress in the development of such nano-phosphors as luminescent materials has received significant research attention. The white-light-emitting diodes (WLEDs) have grown dramatically and represent the most intriguing lighting source of the twenty-first century. The contribution of rare-Earth (RE) ions to lighting technology is explicitly addressed. The additional physical characteristics of white light that are addressed in the present manuscript comprise the correlated color temperature (CCT), the color rendering index (CRI), and the Commission International de’ Eclairage (CIE) chromaticity coordinates. Multiple synthesis methods employed around the globe to produce such industrially important nano-phosphors along with more specialized and impactful techniques to characterize all such materials are thus thoroughly explored. Also, the various technologically significant applications of these materials are described. The evolution of these potentially suitable luminescent materials for WLEDs and their white-light characteristics is also outlined. The manuscript presents a comprehensive overview of the advancement and innovation of nano-phosphors, their application fields and the significant milestones of artificial lighting toward modernization.

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White-light-emitting Dy3+-doped amorphous SiO2 nanophosphors derived from rice husk

Cited by 16 publications

References 31 publications

Improvement in white light emission of Dy³⁺ doped CaMoO₄ via Zn²⁺ co-doping

Improvement in white light emission of Dy³⁺ doped CaMoO₄ via Zn²⁺ co-doping

Development of SiO2/rGO from Rice Husk for Photocatalysis, Antioxidant, Electrochemical and Green Sensor Detection Studies

Review— On the Development of Phosphors for Luminescent Materials: Synthesis, Characterization, Applications and Evolution of Phosphors as White-Light-Emitting Diodes

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White-light-emitting Dy3+-doped amorphous SiO2 nanophosphors derived from rice husk

Cited by 16 publications

References 31 publications

Improvement in white light emission of Dy3+ doped CaMoO4 via Zn2+ co-doping

Improvement in white light emission of Dy3+ doped CaMoO4 via Zn2+ co-doping

Development of SiO2/rGO from Rice Husk for Photocatalysis, Antioxidant, Electrochemical and Green Sensor Detection Studies

Review— On the Development of Phosphors for Luminescent Materials: Synthesis, Characterization, Applications and Evolution of Phosphors as White-Light-Emitting Diodes

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Improvement in white light emission of Dy³⁺ doped CaMoO₄ via Zn²⁺ co-doping

Improvement in white light emission of Dy³⁺ doped CaMoO₄ via Zn²⁺ co-doping