Ultraviolet to near infrared down-conversion in CaF2:Nd3+/Yb3+/Li+ phosphors

Anda, J. De; Enrichi, Francesco; Righini, Giancarlo C.; Falcony, C.

doi:10.1016/j.jlumin.2021.118241

Cited by 9 publications

(2 citation statements)

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“…But the populations of 4 F 7/2 and 4 F 5/2 can be enhanced by increasing the temperature. Based on the previous reports, 34,35 the populations of 4 F 7/2 and 4 F 5/2 generally should follow the phonon-assisted energy transfer from Yb 3+ to Nd 3+ . The process only includes one photon and multiple phonons.…”

Section: Resultsmentioning

confidence: 80%

Visible and near-infrared luminescence properties of Nd³⁺/Yb³⁺ co-doped Gd₂O₃ phosphors for highly sensitive optical thermometry

Zhang

Wang

et al. 2022

Dalton Trans.

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Section: Resultsmentioning

confidence: 80%

Visible and near-infrared luminescence properties of Nd³⁺/Yb³⁺ co-doped Gd₂O₃ phosphors for highly sensitive optical thermometry

Zhang

Wang

et al. 2022

Dalton Trans.

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“…Os outros três tipos de mecanismo necessitam de um íon sensibilizador e outro ativador. Geralmente o íon ativador utilizado para esses mecanismos tem sido o Yb 3+ , pois possui emissão no infravermelho, e os íons como Tm 3+ , Ho 3+ , Tb 3+ , Pr 3+ , e Nd 3+ são utilizados como sensibilizadores por possuir nível ressonante com Yb 3+ [109][110][111][112][113].…”

Section: Conversão Descendente De Energiaunclassified

Síntese por pirólise de aerossol e caracterização de molibdato de sódio e ítrio (NaY(MoO>sub<4>/sub<)>sub<2>/sub<) dopados com íons lantanídeos e estudos de conversão de energia

Silva¹

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Luminescent materials doped by lanthanide ions have been widely studied due to their numerous applications in different fields. Among these materials, we can highlight hosts based on molybdates, since they have good chemical stability, high refractive index and low phonon energy. Molybdates in general, with a formula MLn(MoO4)2 (M = alkali metals; Ln = lanthanides), are interesting because they have good solubility for lanthanide ions and, therefore, they are able to receive a large amount of ions without showing luminescence suppression. Thus, this work aimed to synthesize by spray pyrolysis method the host sodium yttrium molybdate (NaY(MoO4)2) doped by lanthanide ions, and the structure and morphology of these materials were characterized, as well as their photoluminescence properties. Materials doped by Eu 3+ were synthesized at three different concentrations, with the aim of using it as a structural probe to study the symmetry site where the ion is inserted in the host, and to evaluate whether the used synthesis method generates materials free of secondary structures. In order to obtain energy upconverting materials, we synthesized NaY(MoO4)2 doped by Er 3+ ions with concentrations ranging from 0.5 to 20% in relation to yttrium (mol/mol). The upconversion mechanisms were evaluated, and thermometry studies were performed on materials doped from 2 to 20% of Er 3+ by the observation of the influence of temperature on the emission intensity of the thermally coupled levels, 2 H11/2 and 4 S3/2, with excitation at 980 nm. NaY(MoO4)2 doped by Pr 3+ ion at a concentration of 1% and codoped by ions (Pr 3+ /Yb 3+ ) with 1% Pr 3+ were also synthesized, varying the concentration of Yb 3+ , to carry out studies of down-conversion process. The materials were obtained with spherical morphology of sizes in the range of 300 -3000 nm with a scheelite-type tetragonal phase structure with space group I41/α. Photoluminescence studies for the Eu 3+ ion indicated a single site of possible symmetry with C2v point group, indicating the absence of spurious phases. Upconversion studies for Er 3+ doped materials with excitation at 980 and 1550 nm showed the involvement of two and three photons, respectively, for the emission mechanism. It was observed that the concentration of Er 3+ ion also influenced the emission spectra profiles. Thermometry studies showed that the materials showed good linearity at temperatures from 213 to 473 K. The down-conversion studies for samples doped by Pr 3+ and Yb 3+ /Pr 3+ ions showed emission in the infrared range (900 -1100 nm) with excitation at 488 nm. It was possible to observe the transfer of energy from the Pr 3+ ions to the Yb 3+ ion. Furthermore, PMMA films were prepared containing the particles of materials codoped with Pr 3+ /Yb 3+ at a Yb 3+ concentrations of 10 and 20%. The films showed emission profiles in the infrared region, with excitation at 488 nm, similar to those observed for only the particles. The used synthesis method showed reproducibility, and the materials obtained showed to be p...

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The morphology and downshifting luminescence of [CaY]F2 crystals doped with Ce3+/Eu3+/2+/Na+

Yagoub

Swart

Coetsee

2022

Ceramics International

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Ultraviolet to near infrared down-conversion in CaF2:Nd3+/Yb3+/Li+ phosphors

Cited by 9 publications

References 56 publications

Visible and near-infrared luminescence properties of Nd³⁺/Yb³⁺ co-doped Gd₂O₃ phosphors for highly sensitive optical thermometry

Visible and near-infrared luminescence properties of Nd³⁺/Yb³⁺ co-doped Gd₂O₃ phosphors for highly sensitive optical thermometry

Síntese por pirólise de aerossol e caracterização de molibdato de sódio e ítrio (NaY(MoO>sub<4>/sub<)>sub<2>/sub<) dopados com íons lantanídeos e estudos de conversão de energia

The morphology and downshifting luminescence of [CaY]F2 crystals doped with Ce3+/Eu3+/2+/Na+

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Ultraviolet to near infrared down-conversion in CaF2:Nd3+/Yb3+/Li+ phosphors

Cited by 9 publications

References 56 publications

Visible and near-infrared luminescence properties of Nd3+/Yb3+ co-doped Gd2O3 phosphors for highly sensitive optical thermometry

Visible and near-infrared luminescence properties of Nd3+/Yb3+ co-doped Gd2O3 phosphors for highly sensitive optical thermometry

Síntese por pirólise de aerossol e caracterização de molibdato de sódio e ítrio (NaY(MoO>sub<4>/sub<)>sub<2>/sub<) dopados com íons lantanídeos e estudos de conversão de energia

The morphology and downshifting luminescence of [CaY]F2 crystals doped with Ce3+/Eu3+/2+/Na+

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Visible and near-infrared luminescence properties of Nd³⁺/Yb³⁺ co-doped Gd₂O₃ phosphors for highly sensitive optical thermometry

Visible and near-infrared luminescence properties of Nd³⁺/Yb³⁺ co-doped Gd₂O₃ phosphors for highly sensitive optical thermometry