Lanthanide-doped lanthanum hafnate nanoparticles as multicolor phosphors for warm white lighting and scintillators

Gupta, Santosh K.; Zuniga, Jose P.; Abdou, Maya; Thomas, Melonie P.; Goonatilleke, Manisha De Alwis; Guiton, Beth S.; Mao, Yuanbing

doi:10.1016/j.cej.2019.122314

Cited by 109 publications

(39 citation statements)

References 59 publications

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“…We also want to emphasize here that photophysical properties of pristine LHOE powder NPs published before [5,7,21] looks very similar to that of film in terms of emission bandwidth and asymmetry ratio. Only difference is increase in stark component of MDT to 3 in film compared 2 in pristine powder.…”

Section: Excitation and Emission Spectra Of The Lhoe-pvdf Films And Fmentioning

confidence: 81%

“…N, N-Dimethylacetamide (DMA, ≥ 99%), acetone (≥ 99.5%), PVDF (average molecular weight of 534,000) were purchased from Sigma-Aldrich USA. The LHOE NPs were synthesized by a molten salt method as reported in our previous publications [5][6][7]10]. 1.0 wt% of LHOE NPs and 22wt%of PVDF were mixed in a 77 wt% solvent (50:50 weight percentage ratio of acetone: DMA) by stirring with a magnet bead for 2 h. The LHOE-PVDF nanocomposite films were fabricated through a drop-casting technique by dropping 1 mL of the solution on a planar surface of a watch glass.…”

Section: Synthesismentioning

confidence: 99%

“…For the same reason, they have been getting significant attention for applications in solid-state lighting, scintillators, thermal sensor, pressure sensor, bioimaging, catalysis, biosensor, photodynamic therapy, fingerprint imaging, etc. [1][2][3][4][5][6][7][8][9]. Synthesis of LNPs plays a vital role in deciding its optimal usage and designated field [10].…”

Section: Introductionmentioning

confidence: 99%

“…[19][20][21] We have done extensive work on red-emitting La 2 Hf 2 O 7 :Eu 3+ (LHOE) down-converting nanoparticle (NP) powders for several applications in the areas of phosphors, scintillators, thermographic phosphors, etc. [5,7,21].…”

Section: Introductionmentioning

confidence: 99%

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Luminescent PVDF nanocomposite films and fibers encapsulated with La2Hf2O7:Eu3+ nanoparticles

et al. 2020

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Luminescent films and fibers are in high demand in display devices and optoelectronics owing to their higher flexibility and mechanical strength compared to powder samples. Keeping that in mind, we have encapsulated La 2 Hf 2 O 7 :Eu 3+ (LHOE) nanoparticles (NPs) synthesized by a molten salt method into polyvinylidene fluoride (PVDF) films and fibers. The LHOE-PVDF nanocomposite fibers were manufactured using a Forcespinning® technology while the counterpart films were fabricated by a drop-casting technique. Their photophysical properties were analyzed and compared. Specifically, the red emission with optimum lifetime, color coordinates, and branching ratio of the LHOE NPs can be reproduced even when incorporated inside the PVDF films and fibers. Our studies demonstrate that the LHOE-PVDF films have better emission output, excited-state lifetime, quantum yield, and color purity than the fibers. This is attributed to lower defect density and better surface texture of the LHOE-PVDF films compared to the fibers. Based on the Judd-Ofelt analysis, we have also elucidated that the Eu-O bond is more polarizable and has a higher degree of covalency in the LHOE-PVDF films compared to that in the fibers. The trend of the Judd-Ofelt parameters suggested that Eu 3+ has a more asymmetric environment in the films compared to the fibers which impart higher red color purity to the former.

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Section: Excitation and Emission Spectra Of The Lhoe-pvdf Films And Fmentioning

confidence: 81%

Section: Synthesismentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Luminescent PVDF nanocomposite films and fibers encapsulated with La2Hf2O7:Eu3+ nanoparticles

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“…When θ = 3, nonradiative energy transfer proceeds via exchange interaction, θ = 6 corresponds to dipole–dipole (d–d) interaction, θ = 8 corresponds to dipole–quadrupole (d–p) interaction, and θ = 10 corresponds to quadrupole–quadrupole (q–q) interaction. 51 Applying the condition of β( x )θ/3 ≫ 1, eq S2 is simplified as eq S3.…”

Section: Resultsmentioning

confidence: 99%

Samarium-Activated La₂Hf₂O₇ Nanoparticles as Multifunctional Phosphors

et al. 2019

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Recent developments in the field of designing novel nanostructures with various functionalities have pushed the scientific world to design and develop high-quality nanomaterials with multifunctional applications. Here, we propose a new kind of doped metal oxide pyrochlore nanostructure for solid-state phosphor, X-ray scintillator, and optical thermometry. The developed samarium-activated La2Hf2O7 (LHOS) nanoparticles (NPs) emit a narrow and stable red emission with lower color temperature and adequate critical distance under near-UV and X-ray excitations. When the LHOS NPs are exposed to an energetic X-ray beam, the Sm3+ ions situated at the symmetric environment get excited along with those located at the asymmetric environment, which results in a low asymmetry ratio of Sm3+ under radioluminescence compared to photoluminescence. High activation energy and adequate thermal sensitivity of the LHOS NPs highlight their potential as a thermal sensor. Our results indicate that these Sm3+-activated La2Hf2O7 NPs can serve as a multifunctional UV, X-ray, and thermographic phosphor.

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Luminescent Nanocrystalline Metal Oxides

Puri,

Kaur,

Golia

et al. 2023

Metal Oxide Nanocomposite Thin Films for Optoelectronic Device Applications

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Lanthanide-doped lanthanum hafnate nanoparticles as multicolor phosphors for warm white lighting and scintillators

Cited by 109 publications

References 59 publications

Luminescent PVDF nanocomposite films and fibers encapsulated with La2Hf2O7:Eu3+ nanoparticles

Luminescent PVDF nanocomposite films and fibers encapsulated with La2Hf2O7:Eu3+ nanoparticles

Samarium-Activated La₂Hf₂O₇ Nanoparticles as Multifunctional Phosphors

Luminescent Nanocrystalline Metal Oxides

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Lanthanide-doped lanthanum hafnate nanoparticles as multicolor phosphors for warm white lighting and scintillators

Cited by 109 publications

References 59 publications

Luminescent PVDF nanocomposite films and fibers encapsulated with La2Hf2O7:Eu3+ nanoparticles

Luminescent PVDF nanocomposite films and fibers encapsulated with La2Hf2O7:Eu3+ nanoparticles

Samarium-Activated La2Hf2O7 Nanoparticles as Multifunctional Phosphors

Luminescent Nanocrystalline Metal Oxides

Contact Info

Product

Resources

About

Samarium-Activated La₂Hf₂O₇ Nanoparticles as Multifunctional Phosphors