Dy3+ doped Y2MoO6 nanopowders for white light emission: Spectroscopic and transport properties for optoelectronic and energy harvesting applications

Bhagya, K.R.; Basavaraj, R.B.; Jyothi, K.R.; Nagabhushana, H.; Murugendrappa, M. V.; Prakash, A. P. Gnana; Nagabhushana, Nagendra; Hegde, Vinayakprasanna N.

doi:10.1016/j.colcom.2021.100447

Cited by 12 publications

(1 citation statement)

References 45 publications

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“…Os molibdatos podem apresentar diversas estruturas, o que permite diferentes sítios de simetria onde os centros luminescentes possam ocupar e, consequentemente, apresentam propriedades ópticas distintas [21,41]. As principais estruturas encontradas na literatura são monoclínica para as formulas Ln2(MoO4)3 [42,43], Ln2Mo4O15 [44,45] e Ln2MoO6 [46], cúbica para Ln2Mo2O9 e Ln6MoO12 [47][48][49], ortorrômbica para Ln2(MoO4)3 [50][51][52] e tetraédrica para XMoO4 (X = Ca 2+ , Sr 2+ , Ba 2+ ) [37,[53][54][55] e MLn(MoO4)2 (M = Na + , Li + ) [56,57].…”

Section: Molibdatosunclassified

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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Section: Molibdatosunclassified

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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Radiative properties of ‘Eu’in Li–Al–Si–O ceramics: Effect of ‘Si’ to ‘Li’ ratio

Mohapatra

Vinothkumar²,

Sathyamoorthy

et al. 2022

Ceramics International

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Utilization of Aloe vera-infused Sm3+ doped La2MoO6 nanophosphors: Their role in anti-counterfeiting, white LEDs and transport properties

Bhagya,

Jyothi,

Radha Krushna

et al. 2024

Ceramics International

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Dy3+ doped Y2MoO6 nanopowders for white light emission: Spectroscopic and transport properties for optoelectronic and energy harvesting applications

Cited by 12 publications

References 45 publications

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

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

Radiative properties of ‘Eu’in Li–Al–Si–O ceramics: Effect of ‘Si’ to ‘Li’ ratio

Utilization of Aloe vera-infused Sm3+ doped La2MoO6 nanophosphors: Their role in anti-counterfeiting, white LEDs and transport properties

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