Photoluminescence, TGA/DSC and photocatalytic activity studies of Dy3+ doped SrY2O4 nanophosphors

Ghorpade, Santosh P.; Kottam, Nagaraju; Melavanki, Raveendra; Patil, N. R.

doi:10.1039/d0ra03094e

Cited by 13 publications

(6 citation statements)

References 45 publications

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“…5(e)-5(h). The surface morphology of the x = 0 sample has been described previously [31]. Grains first become smaller and then plateau in size as excess Sr is added.…”

Section: Resultsmentioning

confidence: 92%

“…After determining the physical phases and crystal structures of Sr 1+x Y 2 O 4+x (x = 0.01-0.04), these ceramics were analyzed further in detail. Information regarding the SrY 2 O 4 ceramic is provided in our previous study [31].…”

Section: Resultsmentioning

confidence: 99%

“…Figure 4 shows that Y2O 6 distortion and the τ f values exhibit similar trends; Y2O 6 distortion first decreases (from 8.5667% to 8.5643%) and then increases (to 8.5648%) with increasing Sr content. The τ f value is negatively correlated with the recovery force between ions because a higher Y2O 6 distortion results in a weaker recovery force; therefore, τ f gradually decreases with increasing temperature [31].…”

Section: Resultsmentioning

confidence: 99%

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Ultrahigh- Q Sr _{1+
x}Y ₂O _{4+
x} ( x= 0.01–0.04) microwave dielectric ceramics for temperature-stable millimeter-wave dielectric resonator antennas

He,

Jiang,

Song

et al. 2023

Journal of Advanced Ceramics

1
0
0
0

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Microwave dielectric ceramics should be improved to advance mobile communication technologies further. In this study, we prepared Sr 1+x Y 2 O 4+x (x = 0-0.04) ceramics with nonstoichiometric Sr 2+ ratios based on our previously reported SrY 2 O 4 microwave dielectric ceramic, which has a low dielectric constant and an ultrahigh quality factor (Q value). The ceramic exhibited a 33.6% higher Q-by-frequency (Q×f) value (Q ≈ 12,500) at x = 0.02 than SrY 2 O 4 . All Sr 1+x Y 2 O 4+x (x = 0-0.04) ceramics exhibited pure phase structures, although variations in crystal-plane spacings were observed. The ceramics are mainly composed of Sr-O, Y1-O, and Y2-O octahedra, with the temperature coefficient of the resonant frequency (τ f ) of the ceramic increasing with Y2-O octahedral distortion. The ceramic comprises uniform grains with a homogeneous elemental distribution, clear grain boundaries, and no obvious cavities at x = 0.02. The Sr 1+x Y 2 O 4+x (x = 0-0.04) ceramics exhibited good microwave dielectric properties, with optimal performance observed at x = 0.02 (dielectric constant (ε r ) = 15.41, Q×f = 112,375 GHz, and τ f = −17.44 ppm/℃). The τ f value was reduced to meet the temperaturestability requirements of 5G/6G communication systems by adding CaTiO 3 , with Sr 1.02 Y 2 O 4.02 +2wt%CaTiO 3 exhibiting ε r = 16.14, Q×f = 51,004 GHz, and τ f = 0 ppm/℃. A dielectric resonator antenna prepared using Sr 1.02 Y 2 O 4.02 +2wt%CaTiO 3 exhibited a central frequency of 26.6 GHz, with a corresponding gain and efficiency of 3.66 dBi and 83.14%, respectively. Consequently, Sr 1.02 Y 2 O 4.02 -based dielectric resonator antennas are suitable for use in 5G millimeter-wave band (24.5-27.5 GHz) applications.

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“…5(e)-5(h). The surface morphology of the x = 0 sample has been described previously [31]. Grains first become smaller and then plateau in size as excess Sr is added.…”

Section: Resultsmentioning
confidence: 92%

Section: Resultsmentioning
confidence: 99%

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Ultrahigh- Q Sr _{1+
x}Y ₂O _{4+
x} ( x= 0.01–0.04) microwave dielectric ceramics for temperature-stable millimeter-wave dielectric resonator antennas
He,
Jiang,
Song
et al. 2023
Journal of Advanced Ceramics
1
0
0
0
View full text Add to dashboard Cite
Microwave dielectric ceramics should be improved to advance mobile communication technologies further. In this study, we prepared Sr 1+x Y 2 O 4+x (x = 0-0.04) ceramics with nonstoichiometric Sr 2+ ratios based on our previously reported SrY 2 O 4 microwave dielectric ceramic, which has a low dielectric constant and an ultrahigh quality factor (Q value). The ceramic exhibited a 33.6% higher Q-by-frequency (Q×f) value (Q ≈ 12,500) at x = 0.02 than SrY 2 O 4 . All Sr 1+x Y 2 O 4+x (x = 0-0.04) ceramics exhibited pure phase structures, although variations in crystal-plane spacings were observed. The ceramics are mainly composed of Sr-O, Y1-O, and Y2-O octahedra, with the temperature coefficient of the resonant frequency (τ f ) of the ceramic increasing with Y2-O octahedral distortion. The ceramic comprises uniform grains with a homogeneous elemental distribution, clear grain boundaries, and no obvious cavities at x = 0.02. The Sr 1+x Y 2 O 4+x (x = 0-0.04) ceramics exhibited good microwave dielectric properties, with optimal performance observed at x = 0.02 (dielectric constant (ε r ) = 15.41, Q×f = 112,375 GHz, and τ f = −17.44 ppm/℃). The τ f value was reduced to meet the temperaturestability requirements of 5G/6G communication systems by adding CaTiO 3 , with Sr 1.02 Y 2 O 4.02 +2wt%CaTiO 3 exhibiting ε r = 16.14, Q×f = 51,004 GHz, and τ f = 0 ppm/℃. A dielectric resonator antenna prepared using Sr 1.02 Y 2 O 4.02 +2wt%CaTiO 3 exhibited a central frequency of 26.6 GHz, with a corresponding gain and efficiency of 3.66 dBi and 83.14%, respectively. Consequently, Sr 1.02 Y 2 O 4.02 -based dielectric resonator antennas are suitable for use in 5G millimeter-wave band (24.5-27.5 GHz) applications.
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“…This phenomenon was because of the corrosion or oxidation of metals (formation of nonvolatile oxides) 49 . Based on thermograms, the weight loss up to 260°C (moisture loss) 50 were 1.31%, 0.7%, and 2.01% for SS, Fe‐TiO 2 , and SCS@Fe‐TiO 2 , respectively. The same weight loss for SCS@Fe‐TiO 2 and its constituents (2.01%) shows that the doping process did not change the hydrophilic nature of the final catalyst.…”

Section: Resultsmentioning
confidence: 99%

Magnetically recoverable steel slag/TiO₂ visible‐light‐driven photocatalyst for paraquat degradation
Moslemzadeh
¹
,
Salehfar²,
Ghanbari
³

et al. 2022
Env Prog and Sustain Energy
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“…• Scanning electron microscopy observations was used to see a change in morphology of the grains coupled with an interaction of the nanoparticles with the particles. [36][37][38][39]…”

Section: Discussionmentioning
confidence: 99%

Characterization and evaluation of thin films of a polymer reinforced with nanoparticles using the spin coating technique
Melavanki¹,
Siddaraju²,
Shyam³
et al. 2022
MSEIJ
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Thin films of the polymer, polyvinylpyloridate, reinforced with zinc-nickel ferrite nanoparticles (Zn0.5Ni0.5Fe2O4) and prepared using the technique of spin coating is the central theme of presentation and discussion in this research paper. The zinc-nickel ferrite nanoparticles were used to reinforce a thin film of the chosen polymer and for varying concentrations. The prepared thin films were transparent and consequently studied for the purpose of selection and use in applications specific to the domain of photonics. Optical characterization of samples of the as-synthesized thin films was done using different spectroscopy techniques. Optical density of the as-prepared thin films was obtained using a ultra-violet (UV) spectrophotometer. The reinforcing effect was observed from the emission spectra that was obtained using the fluorescence spectrophotometer. Also, Fourier transform infrared spectroscopy (FTIR) of the reinforced thin films of the chosen polymer was obtained and compared with the unreinforced pure polymer and did reveal an observable change in both the peak value and intensity of the peak. X-ray diffraction (XRD) analysis revealed a noticeable difference in both intensity and crystallization of the thin films of the reinforced polymer. Scanning electron microscopy observations revealed a morphological change of the thin films. Roughness of the sample surface was studied with the help of images obtained from an atomic force microscope (AFM). The present research study technique of spin coating was done properly and successfully. With a gradual increase in the number of reinforcing nanoparticles in the polymer matrix we did observe an increase in Optical Density using UV-Visible spectroscopy. An increase in the Optical Density is beneficial for attaining an improvement in anti-reflection response. This study helped establish the effect of nanoparticle reinforcements on optical properties while concurrently establishing the need for selection and use of thin films for applications in the field of photonics.

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Photoluminescence, TGA/DSC and photocatalytic activity studies of Dy³⁺ doped SrY₂O₄ nanophosphors

Abstract: Photoluminescence properties of Dy3+:SrY2O4 nanophosphors designed for warm w-LED applications.

Cited by 13 publications

References 45 publications

Ultrahigh- Q Sr _{1+
x}Y ₂O _{4+
x} ( x= 0.01–0.04) microwave dielectric ceramics for temperature-stable millimeter-wave dielectric resonator antennas

Ultrahigh- Q Sr _{1+
x}Y ₂O _{4+
x} ( x= 0.01–0.04) microwave dielectric ceramics for temperature-stable millimeter-wave dielectric resonator antennas

Magnetically recoverable steel slag/TiO₂ visible‐light‐driven photocatalyst for paraquat degradation

Characterization and evaluation of thin films of a polymer reinforced with nanoparticles using the spin coating technique

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Photoluminescence, TGA/DSC and photocatalytic activity studies of Dy3+ doped SrY2O4 nanophosphors

Abstract: Photoluminescence properties of Dy3+:SrY2O4 nanophosphors designed for warm w-LED applications.

Cited by 13 publications

References 45 publications

Ultrahigh- Q Sr 1+ x Y 2O 4+ x ( x= 0.01&ndash;0.04) microwave dielectric ceramics for temperature-stable millimeter-wave dielectric resonator antennas

Ultrahigh- Q Sr 1+ x Y 2O 4+ x ( x= 0.01&ndash;0.04) microwave dielectric ceramics for temperature-stable millimeter-wave dielectric resonator antennas

Magnetically recoverable steel slag/TiO2 visible‐light‐driven photocatalyst for paraquat degradation

Characterization and evaluation of thin films of a polymer reinforced with nanoparticles using the spin coating technique

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Product

Resources

About

Photoluminescence, TGA/DSC and photocatalytic activity studies of Dy³⁺ doped SrY₂O₄ nanophosphors

Ultrahigh- Q Sr _{1+
x}Y ₂O _{4+
x} ( x= 0.01–0.04) microwave dielectric ceramics for temperature-stable millimeter-wave dielectric resonator antennas

Ultrahigh- Q Sr _{1+
x}Y ₂O _{4+
x} ( x= 0.01–0.04) microwave dielectric ceramics for temperature-stable millimeter-wave dielectric resonator antennas

Magnetically recoverable steel slag/TiO₂ visible‐light‐driven photocatalyst for paraquat degradation