Luminescent behavior of Eu3+ doped BaHfO3 perovskite ceramic under UV radiation

Guzmán-Olguín, J.C.; Esquivel, R.I. López; Jasso, G. Torres; Guzmán‐Mendoza, J.; Montalvo, T. Rivera; Garcı́a-Hipólito, M.; Falcony, C.

doi:10.1016/j.apradiso.2019.108815

Cited by 7 publications

(8 citation statements)

References 22 publications

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“…Some authors have proposed theoretical models for the observed 5 D 0 → 7 F 0 transition, including the breakdown of the closure approximation in the Judd–Ofelt theory and third order perturbation theory [ 1 , 32 , 33 ]. The most obvious explanation assumes that this transition is due to J-mixing or to the mixing of low-lying charge-transfer states into the wave functions of the 4f 6 configuration.…”

Section: Resultsmentioning

confidence: 99%

“…Furthermore, even though the induced electric dipole (ED) 5 D 0 → 7 F 0 transition is strictly forbidden by the ΔJ selection rule of the Judd–Ofelt theory, there are reported occurrences of it as a well-known example of the breakdown of the selection rules of the Judd–Ofelt theory [ 1 ]. For example, Guzmán-Olguín et al showed an unusual great intensity of the 5 D 0 → 7 F 0 transition centered at 580 nm when they excited their Eu 3+ -doped BaHfO 3 perovskite ceramic under UV radiation with the wavelength associated with the charge transfer band (272 nm), while this transition was very weak when the sample was excited at 396 or 466 nm wavelengths [ 32 ]. One of the co-authors of this manuscript, Gupta, with his co-workers, reported the presence of two Stark components in the 5 D 0 → 7 F 0 transition from their Nd 2 Zr 2 O 7 :Eu phosphor when excited at 256 nm [ 33 ].…”

Section: Introductionmentioning

confidence: 99%

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Excitation-Dependent Photoluminescence of BaZrO3:Eu3+ Crystals

et al. 2022

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The elucidation of local structure, excitation-dependent spectroscopy, and defect engineering in lanthanide ion-doped phosphors was a focal point of research. In this work, we have studied Eu3+-doped BaZrO3 (BZOE) submicron crystals that were synthesized by a molten salt method. The BZOE crystals show orange–red emission tunability under the host and dopant excitations at 279 nm and 395 nm, respectively, and the difference is determined in terms of the asymmetry ratio, Stark splitting, and intensity of the uncommon 5D0 → 7F0 transition. These distinct spectral features remain unaltered under different excitations for the BZOE crystals with Eu3+ concentrations of 0–10.0%. The 2.0% Eu3+-doped BZOE crystals display the best optical performance in terms of excitation/emission intensity, lifetime, and quantum yield. The X-ray absorption near the edge structure spectral data suggest europium, barium, and zirconium ions to be stabilized in +3, +2, and +4 oxidation states, respectively. The extended X-ray absorption fine structure spectral analysis confirms that, below 2.0% doping, the Eu3+ ions occupy the six-coordinated Zr4+ sites. This work gives complete information about the BZOE phosphor in terms of the dopant oxidation state, the local structure, the excitation-dependent photoluminescence (PL), the concentration-dependent PL, and the origin of PL. Such a complete photophysical analysis opens up a new pathway in perovskite research in the area of phosphors and scintillators with tunable properties.

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Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Excitation-Dependent Photoluminescence of BaZrO3:Eu3+ Crystals

et al. 2022

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“…Perovskite structures in general have demonstrated excellent ability to host rare earth ions for light-emitting applications. − Barium hafnium oxide (BHO) with the formula BaHfO 3 represents a very interesting class of nonpolar perovskite materials with superlative properties such as a large band gap ∼6 eV, high dielectric constant, low phonon frequency <700 cm –1 , high transparency in UV–visible region, which makes it an ideal host for rare earth-doped photoluminescence (PL). − BHO also has very high density (8.5 g/cc) and high effective atomic number ( Z eff = 64.6), making it an ideal host for scintillators and X-ray phosphors . In fact, the BHO sample itself demonstrated broad RL at around 410 nm, which disappears on doping, though .…”

Section: Introductionmentioning

confidence: 99%

“…In one of the works, the authors have stabilized both Eu 3+ and Eu 2+ to produce white light emission . Guzman–Olguin also discussed about PL of BHOE under UV excitation but did not give any information on the role of defects, local dopant structure and host–dopant energy transfer efficacy . Drag–Jarzabek also explored PL of BHOE, but their work was more focused on designing the same using a single molecular precursor rather than photophysical aspects .…”

Section: Introductionmentioning

confidence: 99%

Harvesting Light from BaHfO₃/Eu³⁺ through Ultraviolet, X-ray, and Heat Stimulation: An Optically Multifunctional Perovskite

et al. 2022

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Materials with optical multifunctionality such as photoluminescence (PL), radioluminescence, and thermoluminescence (TL) are a boon for a sustainable society. BaHfO3 (barium hafnium oxide [BHO]) under UV irradiation demonstrated visible PL endowed by oxygen vacancies (OVs). Eu3+ doping in BHO (BHOE) introduces f-state impurity levels just below the conduction band for both Eu@Ba and Eu@Hf sites, causing efficient host-to-dopant energy transfer, generating intense 5D0 → 7F1 magnetic dipole transitions (MDT) with internal quantum yield of ∼70%. X-ray photoelectron spectroscopy and electron paramagnetic resonance showed the formation of OVs in both BHO and BHOE samples with more vacancies in the doped sample. The positron lifetime measurements suggested that Eu3+ ions are distributed at both Ba2+ and Hf4+ sites. The association of OVs with Hf4+ and Eu3+ ions due to high charge/radius ratio is considered to be responsible for lowering the symmetry around Eu3+ ions to C 4v in BHOE. Density functional theory studies of defect formation energy justified the same. Time-resolved emission spectroscopy showed distinct spectra for Eu@Ba and Eu@Hf sites corresponding to symmetric and asymmetric environments, respectively. This could be highly relevant in designing color tunable phosphor by forcing dopant ions at one specific site because Eu@Ba displayed orange emission whereas Eu@Hf displayed red emission. We could further harness BHOE for X-ray scintillator application by designing a thin film, which showed efficient conversion of high-energy X-ray into visible light. Under beta irradiation; both BHO and BHOE showed distinct TL glow curves as shallow traps were formed in the former and deep traps in the latter, which could have long-term implications in harnessing this material for persistent luminescence. We believe that BHO/BHOE demonstrated an extraordinary credential as a perovskite for multifunctional applications in the area of defect-induced light emission, UV phosphor, X-ray scintillator, and TL crystals.

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“…BaHfO 3 (BHO) is an interesting class of non‐polar perovskite materials with favorable properties including wide band gap∼ 6 eV, high dielectric constant, ability to accommodate large concentration of dopant ion at both A and B‐site, high radiation stability, low phonon energy (<700 cm −1 ), high UV‐visible transparency, and so forth. which makes it an ideal host lattice for actinide (An) and lanthanide (Ln) doping 16–18 …”

Section: Introductionmentioning

confidence: 99%

Interaction of lanthanide and actinide with BaHfO₃ perovskite: A case study with cerium and uranium

et al. 2022

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Speciation of actinide (An) and lanthanide (Ln) in technologically important ceramics is very important from both fundamental as well as technological aspects. The intrinsic structural flexibility of perovskite containing AO 6 and BO 12 polyhedra makes them suitable and rich hosts for An and Ln. In this work, emphasis was given to deciphering information such as oxidation state, local dopant site, charge compensating defects, excited state kinetics, and so forth in BaHfO 3 (BHO) related to dopant uranium (BHO-U) and cerium (BHO-Ce). Several spectroscopic techniques namely, time-resolved photoluminescence (TRPL), positron annihilation lifetime spectra (PALS), and thermoluminescence (TL) spectroscopy coupled with density functional theory (DFT) were employed to probe the same. Ce and U though are distributed at both Ba and Hf sites, Ce prefers the former, while U prefers the latter site. Uranium on the other hand stabilizes as U 6+ in the form of octahedral uranate ion giving green emission. PALS suggested the formation of defects in BHO-Ce and BHO-U with oxygen vacancies predominating in the former whereas BHO-U perovskites are loaded with cation vacancies and vacancy clusters. These cation vacancies are responsible for lower TL output in BHO-U. TL measurements also suggested cerium doping leads to a higher density of deeper traps in BHO-Ce compared to uranium doping in BHO-U which is in concurrence with DFT results and may have implications in designing afterglow phosphors based on perovskite. We believe this work would have a long-term impact on exploring the potential of perovskite for nuclear waste host and afterglow phosphors applications.

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Luminescent behavior of Eu3+ doped BaHfO3 perovskite ceramic under UV radiation

Cited by 7 publications

References 22 publications

Excitation-Dependent Photoluminescence of BaZrO3:Eu3+ Crystals

Excitation-Dependent Photoluminescence of BaZrO3:Eu3+ Crystals

Harvesting Light from BaHfO₃/Eu³⁺ through Ultraviolet, X-ray, and Heat Stimulation: An Optically Multifunctional Perovskite

Interaction of lanthanide and actinide with BaHfO₃ perovskite: A case study with cerium and uranium

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Luminescent behavior of Eu3+ doped BaHfO3 perovskite ceramic under UV radiation

Cited by 7 publications

References 22 publications

Excitation-Dependent Photoluminescence of BaZrO3:Eu3+ Crystals

Excitation-Dependent Photoluminescence of BaZrO3:Eu3+ Crystals

Harvesting Light from BaHfO3/Eu3+ through Ultraviolet, X-ray, and Heat Stimulation: An Optically Multifunctional Perovskite

Interaction of lanthanide and actinide with BaHfO3 perovskite: A case study with cerium and uranium

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Product

Resources

About

Harvesting Light from BaHfO₃/Eu³⁺ through Ultraviolet, X-ray, and Heat Stimulation: An Optically Multifunctional Perovskite

Interaction of lanthanide and actinide with BaHfO₃ perovskite: A case study with cerium and uranium