Optical influence of annealing in nano- and submicron-scale ZrO2 powders

Ashraf, Sara; Irfan, Muhammad; Kim, Dong-Ju; Jang, Jae‐Hyung; Han, Won‐Taek; Jho, Young‐Dahl

doi:10.1016/j.ceramint.2014.01.063

Cited by 29 publications

(23 citation statements)

References 22 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…A prominent peak is observed at 499 nm and less intense peaks are observed at 533, 568, and 604 nm. There are two arguments given in the literature for the emission peak at 499 nm in ZrO 2 . ,− According to the first one, the emission peak at 499 nm is caused by electron transitions (e g → t 2g ) in impurity ions of titanium (Ti 3+ ). ,,, Another point of view is that the luminescence at 499 nm is caused by intrinsic defects that are related to oxygen vacancies. ,,, However, in the present work, the results of the EPR and EDX exclude the existence of Ti 3+ ions in the samples. Other emission peaks observed at 568 and 605 nm are the related surface trap defects …”

Section: Resultsmentioning

confidence: 55%

“…The XRD results of the ZrO 2 sample annealed at ≤500 °C show a tetragonal phase and it transforms into monoclinic when ZrO 2 was annealed at a higher temperature, that is, ≥1000 ο C. Meanwhile, the PL emission peak position changed with the crystalline phase of ZrO 2 . Typically, the synthesized ZrO 2 sample exhibits 5–10% of the tetragonal phase along with the monoclinic phase. − According to the literature, a prominent PL peak appears in the range 390–425 nm for a pure tetragonal structure , with a lifetime decay smaller than 10 ns. ,, A PL peak is reported between 475 and 500 nm for monoclinic ZrO 2 ,− with a corresponding lifetime decay of up to a few μs (<20 μs). , As far as monoclinic ZrO 2 is concerned, the origin of the prominent emission band (expected in the range 475–500 nm) is still a matter of debate. Several reports attribute this band to the inherent presence of impurity titanium ions (Ti 3+ ) ,,, and this hypothesis is supported by density functional theory (DFT) calculations .…”

Section: Introductionmentioning

confidence: 97%

See 1 more Smart Citation

Unraveling the Charge State of Oxygen Vacancies in Monoclinic ZrO₂ and Spectroscopic Properties of ZrO₂:Sm³⁺ Phosphor

et al. 2021

View full text Add to dashboard Cite

Ion beam analysis methods are very sensitive to analyze the defects and impurities in insulators and semiconductors. The present study focuses on an investigation of the nature of defects in monoclinic ZrO 2 and spectroscopic properties of ZrO 2 :Sm 3+ (1 mol %) phosphor using ionoluminescence (IL) under the excitation of 100 MeV Si 7+ ions. The structures of the combustion-synthesized ZrO 2 and ZrO 2 :Sm 3+ samples were revealed to be monoclinic as analyzed through X-ray diffraction, Raman spectroscopy, and selected area electron diffraction methods. Structural parameters were assessed utilizing Rietveld refinement of the obtained XRD data using GSAS II software. The average particle size of ZrO 2 and ZrO 2 :Sm 3+ samples was found to be 77 ± 2 and 72 ± 3 nm, respectively, as determined from transmission electron microscopy images. The electronic structure and the oxygen vacancy defect population were analyzed using experimental measurements [viz ionoluminescence (IL), photoluminescence (PL), PL lifetime decay, electron paramagnetic resonance (EPR), and diffuse reflectance spectroscopy (DRS)]. The prominent IL and PL emission peaks seen at 499 nm in monoclinic ZrO 2 are attributed to the F + type center that was assigned to the F 2 + centeran aggregate of the singly ionized oxygen vacancies. ZrO 2 :Sm 3+ (1 mol %) samples display Sm 3+ characteristic IL emission peaks between 562−582, 600−620, 635−673, and 719 nm, corresponding to ( 4 G 5/2 → 6 H 5/2 ), ( 4 G 5/2 → 6 H 7/2 ), ( 4 G 5/2 → 6 H 9/2 ), and ( 4 G 5/2 → 6 H 11/2 ) transitions under 100 MeV Si 7+ ion excitation for various fluences. The 100 MeV Si 7+ ion-induced ion track radius (damaged cross section) and local temperature were estimated through the thermal spike model to be 0.53 nm and 700 K (the duration is about 10 −13 second), respectively. CIE coordinates fall near the yellow color region and then slightly shift toward the green color region with an increase of fluence because of the lattice distortion and change of the Sm 3+ symmetry site.

show abstract

Section: Resultsmentioning

confidence: 55%

Section: Introductionmentioning

confidence: 97%

Unraveling the Charge State of Oxygen Vacancies in Monoclinic ZrO₂ and Spectroscopic Properties of ZrO₂:Sm³⁺ Phosphor

et al. 2021

View full text Add to dashboard Cite

show abstract

“…[ 79 ] However, emission of 2.6 eV also has been reported in m ‐ZrO 2 powders by Ashraf et al., proposing an origin to electronic transitions between the levels generated by the excited F +* and F + states. [ 85 ] Finally, the component of 2.3 eV could correspond with the emission of 2.2 eV for t ‐ZrO 2 nanoparticles reported by Zhang et al. They attribute it to the presence of carbon impurities (C i ), demonstrating that the emission is tuned in energy with the amount of carbon incorporated in such nanostructures.…”

Section: Resultsmentioning

confidence: 75%

“…The components calculated by the deconvolution of the CL spectra using Gaussian curves are centered at 1.65, 2.3, 2.6, 2.9, 3.2, and 3.5 eV for ZrO 2 annealed at 600 °C and centered at 2.3, 2.6, and 2.9 eV for ZrO 2 buckyballs annealed at 1200 °C, to match the energy of defects-related emissions reported by other authors. [79,[83][84][85][86] The full width at half maximum (FWHM) of these components is adjusted to obtain a fitting value for the coefficient of determination nearest to unity. The values obtained for this parameter are 0.995 and 0.997 after fitting the CL spectra of ZrO 2 buckyballs annealed at 600 and 1200 °C by assigning an FWHM of 0.35 eV to each Gaussian component.…”

Section: Additive Manufacturing Of T-zro 2 and M-zro 2 Microarchitect...mentioning

confidence: 99%

Additive Manufacturing of 3D Luminescent ZrO₂:Eu³⁺ Architectures

Winczewski

Herrera

Cabriel

et al. 2022

Advanced Optical Materials

View full text Add to dashboard Cite

Such radiation has a long-lived 4f-4f transition, observed when evaluating lanthanides resulting in sharp narrowband emission. This light emission can be supported even when incorporating the lanthanide ion in a dispersion medium that acts as a host matrix with diverse functionalities. [7,9] Two host matrix types for lanthanide ions are identified, namely, organic [10] and inorganic materials. [7,11] Inorganic materials have high lattice-binding energy combined with rigidness; thus, in most cases, they show greater chemical and thermal resistance and photostability against continuous excitation than organic materials. [1,8] Highly crystalline inorganic host matrices are typically preferred to reduce point defects emissions. Hence, attention should be given to the crystallinity of the host material and the nonradiative multiphonon relaxation caused by the crystal lattice. [9] In practice, low phonon energy hosts are preferred to utilize the luminescent activator effectively. [7] However, the commonly used SiO 2 (≈1100 cm −1 stretching vibration) presents low lanthanide solubility, [12,13] leading to cluster formation at high dopant contents (10 18 cm −3 ), [14] quenching the lanthanide emission. [13] In photonics, a substitute for SiO 2 is ZrO 2 , which has relatively good transparency in the visible and infrared range and low phonon energy (≈470 cm −1 ). [12] ZrO 2 occurs in three polymorphs, tetragonal, monoclinic, and cubic, denoted t-ZrO 2 , m-ZrO 2 , and Implementation of more refined structures at the nano to microscale is expected to advance applications in optics and photonics. This work presents the additive manufacturing of 3D luminescent microarchitectures emitting light in the visible range. A tailor-made organo-metallic resin suitable for two-photon lithography is developed, which upon thermal treatment in an oxygen-rich atmosphere allows the creation of silicon-free tetragonal (t-) and monoclinic (m-) ZrO 2 . The approach is unique because the tailor-made Zrresin is different from what is achieved in other reported approaches based on sol−gel resins. The Zr-resin is compatible with the Eu-rich dopant, a luminescent activator, which enables to tune the optical properties of the ZrO 2 structures upon annealing. The emission characteristics of the Eu-doped ZrO 2 microstructures are investigated in detail with cathodoluminescence and compared with the intrinsic optical properties of the ZrO 2 . The hosted Eu has an orange−red emission showcased using fluorescence microscopy. The presented structuring technology provides a new platform for the future development of 3D luminescent devices.

show abstract

“…Moreover, another green-colored down-conversion emission is observed with a series of bands at 493, 510, 531, and 554 nm. This is ascribed to the electron transition from the excited state to the ground state of F þ centers located above the valence band due to the singly ionized oxygen-vacancy defects [48]. It was reported that the crystalline ZrO 2 with both monoclinic and tetragonal phases could create new color centers in the presence of the oxygen vacancies.…”

Section: Fluorescent Characteristicsmentioning

confidence: 99%

Design and fabrication of dual-functional microcapsules containing phase change material core and zirconium oxide shell with fluorescent characteristics

Zhang

Wang

2015

Solar Energy Materials and Solar Cells

103

View full text Add to dashboard Cite

Optical influence of annealing in nano- and submicron-scale ZrO2 powders

Cited by 29 publications

References 22 publications

Unraveling the Charge State of Oxygen Vacancies in Monoclinic ZrO₂ and Spectroscopic Properties of ZrO₂:Sm³⁺ Phosphor

Unraveling the Charge State of Oxygen Vacancies in Monoclinic ZrO₂ and Spectroscopic Properties of ZrO₂:Sm³⁺ Phosphor

Additive Manufacturing of 3D Luminescent ZrO₂:Eu³⁺ Architectures

Design and fabrication of dual-functional microcapsules containing phase change material core and zirconium oxide shell with fluorescent characteristics

Contact Info

Product

Resources

About

Optical influence of annealing in nano- and submicron-scale ZrO2 powders

Cited by 29 publications

References 22 publications

Unraveling the Charge State of Oxygen Vacancies in Monoclinic ZrO2 and Spectroscopic Properties of ZrO2:Sm3+ Phosphor

Unraveling the Charge State of Oxygen Vacancies in Monoclinic ZrO2 and Spectroscopic Properties of ZrO2:Sm3+ Phosphor

Additive Manufacturing of 3D Luminescent ZrO2:Eu3+ Architectures

Design and fabrication of dual-functional microcapsules containing phase change material core and zirconium oxide shell with fluorescent characteristics

Contact Info

Product

Resources

About

Unraveling the Charge State of Oxygen Vacancies in Monoclinic ZrO₂ and Spectroscopic Properties of ZrO₂:Sm³⁺ Phosphor

Unraveling the Charge State of Oxygen Vacancies in Monoclinic ZrO₂ and Spectroscopic Properties of ZrO₂:Sm³⁺ Phosphor

Additive Manufacturing of 3D Luminescent ZrO₂:Eu³⁺ Architectures