Structural and luminescent features of cerium doped CaZrO3 blue nanophosphors

Evangeline, B.; Azeem, P. Abdul; Rao, R. Prasada; Swati, G.; Haranath, D.

doi:10.1016/j.jallcom.2016.11.115

Cited by 36 publications

(18 citation statements)

References 34 publications

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“…The band at 902-943 cm −1 was associated with non-bridging bond of Si-O-NBO. 33 Moreover, the presence of peaks at ~1635 and ~3435 cm −1 were attributed to the existence of adsorbed moisture 34,35 and the presence of carbonate band at 1418-1477 cm −1 may be due to the ambient carbon dioxide employed during sintering process. 10 The intensity of FTIR bands strongly depends on the degree of crystallinity and their exact position on type of crystalline phase.…”

Section: Structural Characterizationmentioning

confidence: 99%

A comparative study on in vitro behavior of calcium silicate ceramics synthesized from biowaste resources

et al. 2019

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Calcium silicate ceramics have received significant attention for biomedical applications for their excellent bioactivity and osteoconduction properties. Sol‐gel process is extensively used for the fabrication of calcium silicates. In sol‐gel process, calcium nitrate tetra hydrate (Ca(NO3)2·4H2O) and tetraethylorthosilicate (TEOS) are used as precursors. However, these precursors are expensive. The objective of this work was to compare in vitro behavior of calcium silicate (CaSiO3) produced using biowaste such as rice husk ash (RHA) and eggshells (coded; NCS) with CaSiO3 prepared using TEOS and Ca(NO3)2·4H2O (coded; CCS). Thermal investigation results revealed that the crystallization temperature for NCS is relatively lower (772°C) than for CCS (870°C). Bioactivity was studied in vitro using simulated body fluid (SBF) with respect to mineralization rate of hydroxyapatite. Mineralization of a greater hydroxyapatite was observed on NCS ceramics than CCS ceramics after incubation for 3, 7, 14 days in SBF solution, which was confirmed using X‐ray diffractometer, Fourier transform infrared spectroscopy, scanning electron microscopy‐energy dispersive spectroscopy. Degradation studies were conducted in Tris‐HCl solution and the test results revealed that NCS ceramics has lower dissolution rate than CCS ceramics. The antimicrobial assay has shown that NCS samples exhibit significant zone of inhibition against Escherichia coli and Staphylococcus aureus which confirmed that the CaSiO3 prepared from RHA and eggshell can prevent bacteria from adhering to the surface. In addition cell culture studies revealed that NCS ceramics possess good cytocompatibility with MG‐63 cells and significantly promoted cell proliferation.

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Section: Structural Characterizationmentioning

confidence: 99%

A comparative study on in vitro behavior of calcium silicate ceramics synthesized from biowaste resources

et al. 2019

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“…As for the doping dependence, similar to the PLE spectra, the emission was found to be strongest for x = 0.005 among three concentrations tested. We note that there have been few studies on the concentration dependence of the Ce 3+ ion emission for perovskite hafnates, However, the violet‐blue emission was reported to be strongest for x = 0.002 in Ce 3+ ion doped CaZrO 3 nanocrystals . Our result provides a guideline for a future study on the concentration dependence of the Ce 3+ ion emission in the hafnates.…”

Section: Resultsmentioning

confidence: 99%

“…However, the optical properties of two kinds of compounds have been found to be sizably different in some cases, partially due to a high‐K property in the hafnates. Recently, Ce 3+ ion doped CaZrO 3 has been suggested as a potential material for blue emitting phosphor in RGB composed white LEDs . Motivated by this, we performed a systematic study on the emission property of the Ce 3+ ion doped CaHfO 3 which is a counterpart of CaZrO 3 .…”

Section: Introductionmentioning

confidence: 93%

“…The Ce 3+ ion possesses a single electron in the 4f shell and exhibits strong absorption and efficient fast fluorescence, which originate from the 4f‐5d transitions. Since the transitions including the unshielded 5d orbitals are sensitive to changes in the crystal field, a wide spectral range (UV‐visible) of emissions have been observed from different luminescent materials doped with the Ce 3+ ions . In this sense the incorporation of the Ce 3+ ion into new host materials could induce novel emissions and thereby broaden its application prospects.…”

Section: Introductionmentioning

confidence: 95%

“…Perovskite 4d zirconates and 5d hafnates have been used as host materials for the emission of Ce ions The effective ionic radii of Zr 4+ (73 pm in the six coordinate) and Hf 4+ (71 pm in the six coordinate) are quite similar, and as a result, AZrO 3 and AHfO 3 [A = Ca, Sr, and Ba) compounds for a given A cation are isostructural with similar ionic radii for Zr 4+ and Hf 4+ . However, the optical properties of two kinds of compounds have been found to be sizably different in some cases, partially due to a high‐K property in the hafnates.…”

Section: Introductionmentioning

confidence: 99%

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Violet‐blue emission property of the cerium‐ion doped CaHfO₃: Doping and temperature dependence

2018

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We investigated the emission property of perovskite CaHfO polycrystals with various concentrations of cerium ion (Ce ). With a wide range of UV photoexcitation, we observed a strong emission near 430 nm which should originate from 5d-4f transitions in the Ce ions. Combining these emission spectra with the photoluminescence excitation spectra, we estimated the Stokes shift to be 6700 cm , irrespective of the Ce ion doping concentration. We found that the violet-blue emissions in Ce ions showed non-trivial temperature dependence in their peak position and intensity. We found interesting low-temperature behavior of the violet-blue emission, which might be attributed to the thermal lattice effect in CaHfO . We also discussed our results with those of the similar materials, perovskite zirconates. Our systematic studies provide useful information on the host material CaHfO for a future study on the violet-blue emission of Ce ions.

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Investigation of lanthanum‐sensitized CaZrO₃ blue nanophosphors for white light‐emitting diode applications

et al. 2020

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In the present study, CaZrO3 nanophosphors were sensitized with lanthanum (La) at different concentrations (0.5, 1.0, 1.5, 2.0, and 2.5) prepared using polyvinyl alcohol as the chelating agent through the sol–gel method. To study their structural and optical properties, samples were characterized by X‐ray diffractometry (XRD), field emission scanning electron microscopy (FE‐SEM), transmission electron microscopy (TEM) and photoluminescence (PL). The XRD results revealed that samples were well crystallized and average crystallite sizes were calculated. The average crystallite size value was in good agreement with the value obtained from TEM analysis. Energy dispersive spectroscopy and FE‐SEM confirmed the existence of La in the prepared samples. In the PL spectra, La‐sensitized samples exhibited three bands at 402 nm, 438 nm, and 463 nm in the visible range when excited at the 260 nm wavelength. As the proportion of La increased, the intensity of bands at 438 nm and 463 nm decreased, whereas the band at 402 nm remained stable. Time‐resolved PL spectra illustrated the lifetime of the samples. Corresponding CIE co‐ordinates for La‐sensitized CaZrO3 were calculated.

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Structural and luminescent features of cerium doped CaZrO3 blue nanophosphors

Cited by 36 publications

References 34 publications

A comparative study on in vitro behavior of calcium silicate ceramics synthesized from biowaste resources

A comparative study on in vitro behavior of calcium silicate ceramics synthesized from biowaste resources

Violet‐blue emission property of the cerium‐ion doped CaHfO₃: Doping and temperature dependence

Investigation of lanthanum‐sensitized CaZrO₃ blue nanophosphors for white light‐emitting diode applications

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Structural and luminescent features of cerium doped CaZrO3 blue nanophosphors

Cited by 36 publications

References 34 publications

A comparative study on in vitro behavior of calcium silicate ceramics synthesized from biowaste resources

A comparative study on in vitro behavior of calcium silicate ceramics synthesized from biowaste resources

Violet‐blue emission property of the cerium‐ion doped CaHfO3: Doping and temperature dependence

Investigation of lanthanum‐sensitized CaZrO3 blue nanophosphors for white light‐emitting diode applications

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Product

Resources

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Violet‐blue emission property of the cerium‐ion doped CaHfO₃: Doping and temperature dependence

Investigation of lanthanum‐sensitized CaZrO₃ blue nanophosphors for white light‐emitting diode applications