Precursor technology for the production of white and color phosphors based on Al2O3:Ln (Ln=Eu3+, Tb3+ or Eu3+/Tb3+)

Бакланова, И. В.; Красильников, В. Н.; Tyutyunnik, А. P.; Baklanova, Yana V.

doi:10.1016/j.jssc.2020.121699

Cited by 7 publications

(4 citation statements)

References 45 publications

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“…Yet, their modification by cation doping can be particularly challenging: Al 3þ ion is the smallest among trivalent metal cations and has a large size mismatch with the majority of cations. [44,46] We had surmised that a curvature imposed on the gibbsite-like layers may create a sterically more appropriate coordination environment for residence of the large-size cations in Al sublattice. This has been successfully approved by means of DFT calculations on example of imogolite-a natural or synthetic aluminosilicate layer rolled up seamlessly into nanotube with a record small diameter.…”

Section: Discussionmentioning

confidence: 99%

“…However, in our opinion, structural instability of imogolitelike nanotubes with 100% isomorphic substitution of Al does not preclude an existence of imogolite nanotubes doped by a small amount of foreign elements, when imogolite skeleton is capable to withstand a local distortion on Al sublattice. Remarkably, in contrast to the attempts to dope alumina or complex aluminohydroxides, [44][45][46] the doping of imogolite by various metal cations remains widely abandoned in both experiment and theory. Indeed, the Al 3þ cation has the smallest size among trivalent metal cations.…”

Section: Numerous Studies Determining Peculiarities Of Atommentioning

confidence: 99%

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Imogolite: Curvature‐Induced Hospitality for Trivalent Dopants

Popov

Enyashin

2021

Physica Status Solidi (b)

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Imogolite—a congregation of aluminosilicate nanotubes—has shown a great promise for fabrication of advanced materials. Imogolite nanotubes hold the record narrow diameters distribution and demonstrate one of the highest curvatures among noncarbon nanotubes. Current experimental and theoretical prospects for their modification are related mostly to surface functionalization or to progressive Si substitution on Ge, whereas a doping of Al sublattice is steadily neglected. The empirical rules of Hume–Rothery disallow such doping due to a large size mismatch between Al3+ and the majority of metal cations. Using the quantum‐chemical calculations, herein, the difference in coordination environment is unveiled for 12 sorts of trivalent cations at octahedral Al sites in both a highly curved imogolite layer and the flat gibbsite layer. The curvature of natural imogolite acts provoking for violation of the Hume–Rothery rules, sterically promoting the doping of Al sublattice by cations with radii 1.0–1.2 Å typical for rare‐earth elements. Theoretically, the synthesis of a metal‐doped imogolite is restricted only by the overlap of the phase stability fields for precursor reactants or by kinetic factors. This study might be inciting for the synthesis of chemically modified imogolite and related Ge‐imogolites.

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Section: Discussionmentioning

confidence: 99%

Section: Numerous Studies Determining Peculiarities Of Atommentioning

confidence: 99%

Imogolite: Curvature‐Induced Hospitality for Trivalent Dopants

Popov

Enyashin

2021

Physica Status Solidi (b)

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“…нами было показано, что для нанодисперсного оксида алюминия, полученного термообработкой основного формиата алюминия состава Al(OH)(HCOO) 2 , характерна голубая эмиссия c максимум около 450 nm, происхождение которой связано с наличием собственных дефектов решетки и/или примесного углерода. Нанодисперсные оксиды Al 2 O 3 : Ln (Ln = Eu 3+ /Tb 3+ ) с содержанием допантов 2.5 mol% были синтезированы путем термолиза прекурсоров Al 1−x Ln x (OH)(HCOO) 2 на воздухе при 700 • C[14].…”

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“…Ионы Dy 3+ не имеют координационного числа ниже шести, поэтому могут замещать алюминий (Al 3+ (VI) 0.535 ¦[16]) только в октаэдрических позициях в γ-Al 2 O 3[14].…”

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Люминофоры Холодного Голубого Излучения На Основе Оксида Алюминия, Допированного Диспрозием

Бакланова¹,

Красильников²,

Тютюнник³

et al. 2022

Физика Твердого Тела

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Al2О3:Dy3+ oxides with different colors luminescence were synthesized using precursor technology. The phase composition and crystal structure of the obtained materials were established by X-ray powder diffraction analysis. The excitation and emission spectra, decay curves, thermal quenching of luminescence were studied. Under UV excitation, the phosphors exhibit blue, purplish blue, white emission depending on the concentration of dysprosium and the temperature of annealing of the Al1-xDyx(OH)(HCOO)2 precursor in air.

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Highly enhanced green emission of Mn2+ in Al2O3 coatings formed by plasma electrolytic oxidation via efficient Eu2+ → Mn2+ and Ce3+ → Mn2+ energy transfer

Stojadinović

Ćirić

2021

J Mater Sci: Mater Electron

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Precursor technology for the production of white and color phosphors based on Al2O3:Ln (Ln=Eu3+, Tb3+ or Eu3+/Tb3+)

Cited by 7 publications

References 45 publications

Imogolite: Curvature‐Induced Hospitality for Trivalent Dopants

Imogolite: Curvature‐Induced Hospitality for Trivalent Dopants

Люминофоры Холодного Голубого Излучения На Основе Оксида Алюминия, Допированного Диспрозием

Highly enhanced green emission of Mn2+ in Al2O3 coatings formed by plasma electrolytic oxidation via efficient Eu2+ → Mn2+ and Ce3+ → Mn2+ energy transfer

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