Sensitized IR luminescence in Ca3Y2Ge3O12: Nd3+, Ho3+ under 808 nm laser excitation

Baklanova, Yana V.; Enyashin, Andrey N.; Maksimova, L. G.; Tyutyunnik, A. P.; Chufarov, Alexander Yu.; Gorbatov, Evgeny V.; Бакланова, И. В.; Зубков, В. Г.

doi:10.1016/j.ceramint.2018.01.128

Cited by 20 publications

(2 citation statements)

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“…The calculations on binary and complex oxides have revealed a good suitability of chosen approach for the description of geometry. [64,65] The equilibrium lattice parameters using this DFT GGA scheme can be found in fair agreement with experimental data at the average difference within AE1%.…”

Section: Computational Detailssupporting

confidence: 63%

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: Computational Detailssupporting

confidence: 63%

Imogolite: Curvature‐Induced Hospitality for Trivalent Dopants

Popov

Enyashin

2021

Physica Status Solidi (b)

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“…Ранее было обнаружено, что следовые количества ионов Er 3+ и Tm 3+ , не превышающие 10 −5 −10 −6 wt.%, являются причиной возникновения ап-конверсии в видимом спектральном диапазоне в кристаллах YVO 4 : Nd 3+ и KGd(WO 4 ) 2 [8,9]. Кроме того, для ряда германиевых соединений, допированных неодимом и гольмием, показано, что максимальная интенсивность люминесценции в диапазоне длин волн 2−3 µm наблюдается при следовых концентрациях ионов Ho 3+ [10][11][12][13]. Аналогично, небольшое содержание ионов Tm 3+ (0.001−0.025 at.%) является достаточным для эффективной сенсибилизации ионов Er 3+ и заметно увеличивает интенсивность эмиссии при 2.7 µm в Y 3 Al 5 O 12 : Er 3+ , Tm 3+ [14], и, напротив, концентрация Pr 3+ более 10 −4 mass.% приводит к заметному уменьшению интенсивности и длительности люминесценции стоксовых ИК-полос излучения ионов Nd 3+ в диапазоне 0.86−1.40 µm в известном ИК-люминофоре YPO 4 : Nd 3+ [15].…”

Section: Introductionunclassified

Люминофор Ближнего И Коротковолнового Ик-Диапазона На Основе Ниобата Литий-Лантана Со Структурой Кубического Граната

Бакланова¹,

Липина²,

Максимова³

et al. 2019

Физика Твердого Тела

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Cubic garnets activated by neodymium and holmium, Li_6CaLa_2Nb_2O_12:Nd^3+,Ho^3+, were obtained by solid-state method. The main regularities of changes in the luminescence properties of Li_6C-aLa_2Nb_2O_12:Nd^3+,Ho^3+ solid solutions in the visible, near-IR, and short-wave IR ranges under 808 nm laser diode radiation are determined. The energy transfer mechanism between active centers, involving the participation of Nd^3+ ions as sensitizers for the luminescence of Ho^3+ ions, is proposed. Low phonon energy, high luminescence intensity in the range of 2.0–3.0 μm, and weak up-conversion luminescence in the region of 450–780 nm make it possible to consider the cubic lithium–lanthanum niobates Li_6CaLa_2Nb_2O_12:Nd^3+,Ho^3+ as promising phosphors of the short-wave IR range.

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