A novel orange-red Sm3+-doped CaSiO3 nanostructured phosphor derived from agro food waste materials for white light applications

Raju, M. Krishnam; Rao, R. Prasada; Azeem, P. Abdul

doi:10.1016/j.ceramint.2021.06.077

Cited by 12 publications

(3 citation statements)

References 60 publications

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“…The synthesis process and extraction of SiO 2 through rice husk and CaO from ESs was explained in the previous work. [ 24 ] Briefly, a stoichiometric amount of CaO obtained from ES was dissolved in 2 mole hydrochloric acid and stirred for 1 h to obtain a clear calcium chloride solution (sol A). Sodium silicate solution was obtained by boiling the rice husk ash (RHA) with 2 mole NaOH solution (sol B).…”

Section: Methodsmentioning

confidence: 99%

Color‐Tunable Eu³⁺, Eu²⁺‐Activated CaSiO₃ Nano Phosphor Extract from Agricultural‐Recycling‐Food‐Waste Materials for Display Applications

Raju

Samudrala

Yadav

et al. 2023

Advanced Photonics Research

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A series of Eu3+ and Eu2+ doped wollastonite is produced with a modified sol–gel technique using agricultural‐food waste materials. Rice husk ash (RHA) and eggshell (ES) are used as an usher for silica and calcium oxide, appropriately, at different concentrations (0.0, 0.2, 0.4, 0.6, 0.8, and 1 mol%). Most investigations have documented photoluminescence (PL) from Eu3+ ions caused by electronic transitions between 4f levels (5D0 → 7FJ) but there is limited information on emissions from Eu2+ ions. Fourier transform infrared (FTIR) spectra and X‐ray diffraction (XRD) studies reveal that varying amounts of europium ions do not have any effect on the structure of the host. PL spectra display that europium ions exist in both trivalent and divalent forms. A valence change from Eu3+ to Eu2+ ion is investigated using luminescence measurements. As‐prepared Eu3+ activated β‐wollastonite emitted as red and reduction atmosphere using argon gas produced Eu2+ activated phosphor gives off blue light. X‐Ray photoelectron spectroscopy reveals that throughout the processing of the samples, Eu3+ cations are partially reduced to Eu2+ cations in argon gas atmosphere. These findings prove the feasibility of fabricating white light‐emitting diodes (white‐LEDs) for three‐band type (RGB) phosphors utilizing only one host crystal.

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Section: Methodsmentioning

confidence: 99%

Color‐Tunable Eu³⁺, Eu²⁺‐Activated CaSiO₃ Nano Phosphor Extract from Agricultural‐Recycling‐Food‐Waste Materials for Display Applications

Raju

Samudrala

Yadav

et al. 2023

Advanced Photonics Research

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“…Similarly, EP has chlorine (Cl) and Ca concentrations at 2.65 and 3.65 keV on the EDX micrograph. Moreover, the EDX micrograph of ES shows the presence of Si, Ca, and iron (Fe) at 1.740, 2.622, and 6.403 keV [58,59]. The EDX micrograph of EM exhibits Mg and Ca content at 1.486 and 3.691 keV, respectively [44,60].…”

Section: Scanning Electron Microscopy-energy Dispersive X-ray Spectro...mentioning

confidence: 99%

Influence of Waste Filler on the Mechanical Properties and Microstructure of Epoxy Mortar

Rahman,

2023

Applied Sciences

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This paper presents experimental investigations on epoxy mortar produced using industrial wastes. In some recent studies, coal bottom ash and polyethylene terephthalate (PET) waste have been chosen as a filler to replace sand, and fly ash and silica fume have been chosen as micro fillers for epoxy mortar production; enhanced results in terms of compressive and tensile strengths and durability have been achieved. However, these approaches failed to boost the strength and durability compared to the epoxy steel slag, epoxy sand, epoxy marble dust, and epoxy polyvinyl chloride (PVC) waste. This present research work has investigated the influence of waste filler on the mechanical properties and microstructure of epoxy mortar, produced by using sand and industrial wastes, i.e., steel slag, marble dust, and polyvinyl chloride waste. Based on the composition ratio, the prepared samples of epoxy resin mortar containing 25% epoxy binder (epoxy resin plus epoxy hardener) and 75% filler (1:3) were compared to the cement mortar. However, each specimen of epoxy resin mortar was prepared by mixing with different fillers. The properties such as compressive strength, tensile strength, and microstructural changes were measured using different characterization techniques including X-ray diffraction (XRD), scanning electron microscopy (SEM), Fourier transform infrared radiation spectroscopy (FTIR), and scanning electron microscopy and energy dispersive X-ray spectroscopy (SEM-EDX). From the obtained results, it was found that the strength of the specimens increases when blended with steel slag and marble dust, which is attributed to their peak densities and enhanced particle interactions. The XRD, SEM, FTIR, and SEM-EDX analyses showed the formation of calcium, magnesium, and other phases in the microstructure of epoxy resin-based mortars. This resulted in lower water absorption and porosity, as well as improvements in both compressive and tensile strengths. This research can help in understanding the important role of different industrial wastes as feasible fillers in epoxy resin-based composites.

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“…As the temperature is elevated, there is a discernible elevation in PL intensity. This phenomenon is attributed to the augmentation of nonradiative processes, which in turn diminish the efficacy of radiative recombination [24][25][26]. This relationship underscores the intricate balance between temperature-induced processes that either enhance or hinder the luminescence efficiency within the Sm2O3-SiO2 samples.…”

Section: Photoluminiscence Studymentioning

confidence: 99%

Impact of annealing on structural and optical properties of sol-gel derived samarium silica nanocomposites

Boora,

Rohilla,

Malik

et al. 2024

Zas Mat

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The pursuit of finely tuned material properties has driven the exploration of annealing strategies in the context of Samarium Silica Nanocomposites (Sm-SiO2 NCs) synthesized through the sol-gel route. This study unveils novel insights into the influence of optimized annealing protocols on the structural and functional evolution of these advanced nanocomposites. Through meticulous experimentation, we establish that controlled temperature annealing plays a pivotal role in tailoring the microstructure and properties of Sm-SiO2 NCs. The judicious manipulation of annealing parameters, including temperature duration, and atmosphere, orchestrates distinct transformations in the composite architecture. Field emission microscopy and structural analysis reveal that precise annealing promotes the consolidation of nanoscale domains, leading to improved crystallinity and enhanced connectivity between samarium species and the silica matrix. Moreover, the annealing-induced modifications extend beyond structural aspects to influence functional properties, an increase in crystallite size was observed from 15 nm to 43 nm as an effect of annealing. Our findings illustrate a remarkable enhancement in luminescence intensity as a consequence of optimized annealing, showcasing the potential for tailored photonic applications. These revelations are supported by a comprehensive suite of analytical techniques, including X-ray diffraction, Fourier transform infra red,\Field emission with Energy dispersive x-ray and photoluminescence spectroscopy. The synthesis-annealing synergy not only advances our fundamental understanding of nanocomposite evolution but also furnishes a pathway towards designing multifunctional materials with precision-engineered attributes.

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A novel orange-red Sm3+-doped CaSiO3 nanostructured phosphor derived from agro food waste materials for white light applications

Cited by 12 publications

References 60 publications

Color‐Tunable Eu³⁺, Eu²⁺‐Activated CaSiO₃ Nano Phosphor Extract from Agricultural‐Recycling‐Food‐Waste Materials for Display Applications

Color‐Tunable Eu³⁺, Eu²⁺‐Activated CaSiO₃ Nano Phosphor Extract from Agricultural‐Recycling‐Food‐Waste Materials for Display Applications

Influence of Waste Filler on the Mechanical Properties and Microstructure of Epoxy Mortar

Impact of annealing on structural and optical properties of sol-gel derived samarium silica nanocomposites

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A novel orange-red Sm3+-doped CaSiO3 nanostructured phosphor derived from agro food waste materials for white light applications

Cited by 12 publications

References 60 publications

Color‐Tunable Eu3+, Eu2+‐Activated CaSiO3 Nano Phosphor Extract from Agricultural‐Recycling‐Food‐Waste Materials for Display Applications

Color‐Tunable Eu3+, Eu2+‐Activated CaSiO3 Nano Phosphor Extract from Agricultural‐Recycling‐Food‐Waste Materials for Display Applications

Influence of Waste Filler on the Mechanical Properties and Microstructure of Epoxy Mortar

Impact of annealing on structural and optical properties of sol-gel derived samarium silica nanocomposites

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Product

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Color‐Tunable Eu³⁺, Eu²⁺‐Activated CaSiO₃ Nano Phosphor Extract from Agricultural‐Recycling‐Food‐Waste Materials for Display Applications

Color‐Tunable Eu³⁺, Eu²⁺‐Activated CaSiO₃ Nano Phosphor Extract from Agricultural‐Recycling‐Food‐Waste Materials for Display Applications