Host sensitized NIR emission in rare-earth doped NaY(MoO4)2 phosphors

Tawalare, P.K.; Bhatkar, V.B.; Talewar, Rupesh A.; Joshi, C. P.; Moharil, S. V.

doi:10.1016/j.jallcom.2017.10.169

Cited by 28 publications

(5 citation statements)

References 38 publications

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“…Ln-doped NaY(MoO 4 ) 2 phosphors have been synthesized by a variety of procedures including hydrothermal/solvothermal procedures, 1,8,9,12,13,14,15,16,17,18 molten salts methods 19,20 and the conventional solid state reaction. 21 Most of the reported methods yielded particles with heterogeneous size and shape 12,13,18,19,20,21 or with uniform shape but in the micron size range. 1,14,15,16,17 Only Ding et al have obtained uniform nanoparticles by a solvothermal procedure in the presence of oleic acid and oleylamine as capping agents.…”

Section: Introductionmentioning

confidence: 99%

NaY(MoO₄)₂-based nanoparticles: synthesis, luminescence and photocatalytic properties

et al. 2021

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Section: Introductionmentioning

confidence: 99%

NaY(MoO₄)₂-based nanoparticles: synthesis, luminescence and photocatalytic properties

et al. 2021

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“…Among the various rare earth ions, the trivalent neodymium ion (Nd 3+ ) is known to show luminescence due to f-f transitions at around 880, 1064 and 1340 nm in the NIR region under NIR excitation at 808 nm [32][33][34][35][36]. The emission mechanism is classified as a down-shifting process, and the quantum yield is usually higher than that of up-conversion processes.…”

Section: Introductionmentioning

confidence: 99%

Submicron-sized phosphors based on hexagonal rare earth oxycarbonate for near-infrared excitation and emission

Watanabe

Sejima

Oka

et al. 2019

Journal of Asian Ceramic Societies

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Neodymium-doped rare-earth oxycarbonates, Ln 2 O 2 CO 3 : x mol% Nd 3+ (Ln = La, Gd, and Y, 0 ≤ x ≤ 5), were synthesized by a simple flux method using a 0.476Li 2 CO 3-0.270Na 2 CO 3-0.254K 2 CO 3 eutectic mixture. The suitability of these oxycarbonates as stable, nontoxic bioimaging phosphors that exhibit near-infrared (NIR) emission under NIR excitation was investigated. Gd 2 O 2 CO 3 : x mol% Nd 3+ and Y 2 O 2 CO 3 : x mol% Nd 3+ were obtained in single-phase form with a hexagonal type-II structure. The particle sizes of the Gd 2 O 2 CO 3 : x mol% Nd 3+ and Y 2 O 2 CO 3 : x mol% Nd 3+ were on a submicron scale suitable for bioimaging, but that of La 2 O 2 CO 3 : x mol% Nd 3+ was outside the suitable range for bioimaging. Gd 2 O 2 CO 3 : x mol% Nd 3+ and Y 2 O 2 CO 3 : x mol% Nd 3+ showed characteristic emissions corresponding to the f-f transitions of Nd 3+. The strongest emission peak was observed at around 1064 nm under excitation at 823 nm in the samples containing 2 mol% of Nd 3+. The emission intensity of Gd 2 O 2 CO 3 : 2 mol% Nd 3+ was 1.25 times higher than that of Y 2 O 2 CO 3 : 2 mol% Nd 3+. The emission intensity of both phosphors was also significantly higher than that of the indocyanine green in practical use as a bio-imaging reagent.

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“…Nesta estrutura o molibdênio é coordenado por quatro átomos de oxigênio em um ambiente químico tetraédrico regular e o sódio e ítrio por oito átomos de oxigênio (Figura 1) [27]. A obtenção destes materiais pode ocorrer por diversas metodologias como estado sólido [73], hidrotermal [74] e processo de reprecipitação assistida por ligante [75].…”

Section: Molibdatosunclassified

“…A matriz NaY(MoO4)2 foi amplamente utilizada para diversos estudos óticos, como por exemplo, em estudos de termometria com materiais dopados por Pr 3+ [78] e co-dopados Yb 3+ /Er 3+ [28]. Também foram realizados estudos com materiais dopados por Nd 3+ como conversores de energia com excitação na banda de transferência de carga e, consequente, emissão na região do infravermelho próximo [27], este efeito também foi observado em materiais co-dopados por Er 3+ /Ho 3+…”

Section: Molibdatosunclassified

“…Dentre as matrizes do tipo MLn(MoO4)2, a matriz molibdato de sódio e ítrio (NaY(MoO4)2) tem sido amplamente estuda por diversos pesquisadores [24][25][26]. Já foram reportadas na literatura a síntese de NaY(MoO4)2 pelas metodologias hidrotermal [24][25][26] e reação do estado sólido [27] dopados com diversos íons lantanídeos. Trabalhos recentes mostraram que esta matriz apresenta potencial para aplicação em termometria a partir da conversão ascendente de energia, como reportado por Xingxing et al, 2015 [28] com a matriz co-dopada com Yb 3+ /Er 3+ sintetizada pelo método hidrotermal [28].…”

Section: Introductionunclassified

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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

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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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Host sensitized NIR emission in rare-earth doped NaY(MoO4)2 phosphors

Cited by 28 publications

References 38 publications

NaY(MoO₄)₂-based nanoparticles: synthesis, luminescence and photocatalytic properties

NaY(MoO₄)₂-based nanoparticles: synthesis, luminescence and photocatalytic properties

Submicron-sized phosphors based on hexagonal rare earth oxycarbonate for near-infrared excitation and emission

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

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Host sensitized NIR emission in rare-earth doped NaY(MoO4)2 phosphors

Cited by 28 publications

References 38 publications

NaY(MoO4)2-based nanoparticles: synthesis, luminescence and photocatalytic properties

NaY(MoO4)2-based nanoparticles: synthesis, luminescence and photocatalytic properties

Submicron-sized phosphors based on hexagonal rare earth oxycarbonate for near-infrared excitation and emission

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

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Product

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NaY(MoO₄)₂-based nanoparticles: synthesis, luminescence and photocatalytic properties

NaY(MoO₄)₂-based nanoparticles: synthesis, luminescence and photocatalytic properties