Spectral characteristics of nanoamorphous phosphors obtained by evaporation of Sr2Gd8(SiO4)6O2: Eu polycrystals

Зуев, М. Г.; Sokovnin, S. Yu.; Il’ves, Vladislav G.; Бакланова, И. В.; Васин, А. А.

doi:10.1016/j.jssc.2014.06.034

Cited by 17 publications

(8 citation statements)

References 20 publications

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“…Синтез поликристаллических образцов осуществляли обжигом на воздухе смеси компонентов. Препаративные методы синтеза аналогичны методам, описанным в работе [3,16] [31]. Освобожденный электрон захватывается ионами Еu 3+ , являющимися электронными ловушками [32], Еu 3+ восстанавливается до Eu 2+ .…”

Section: методика экспериментаunclassified

“…В статье [2], например, показано, что интенсивность свечения ионов Eu 3+ в объемных люминофорах YBO 3 : Eu 3+ выше, чем в соответствующих нанолюминофорах, синтезированных методом соосаждения. В работе [3], наоборот, интенсивность свечения Eu 3+ выше в аморфных нанолюминофорах, чем в объемных образцах Sr 2 Gd 8 (SiO 4 ) 6 O 2 : Eu. Нанолюминофоры получены испарением электронным пучком (ИЭП) мишеней из указанных силикатов.…”

Section: Introductionunclassified

“…Расположение линий в спектре НП говорит о присутствии в нeм в основном изолированных групп SiO 4 . В то же время появление в спектре частот в области 600−700 cm −1 свидетельствует в пользу формирования в образце незначительной концентрации полимеризованных кремнийкислородных фрагментов[3,22]. Появление новой частоты при 716 cm −1 , относящейся, вероятно, к колебаниям мостиковых связей Si−O−Si, является индикатором процессов полимеризации[21].…”

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Новые Наноразмерные Люминофоры, Полученные Испарением Силикатов И Германатов РЗЭ

Зуев¹,

Ильвес²,

Соковнин³

et al. 2019

Физика Твердого Тела

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Nanophosphors in the amorphous state are first obtained via pulsed electron beam evaporation of targets made of polycrystalline phosphors with the compositions Ca_2M_8(SiO_4)_6O_2:Eu (M = Y and Gd) and Ca_2La_8(GeO_4)_6O_2:Eu with the structure of oxyapatite. Reduction of ions Eu^3+ → Eu^2+ in the electron beam is found. Modification of the Raman scattering (RS) spectra of the samples in the case of a decrease in the size of the particles from bulk to a nanosized state is found. The change in the forbidden band width E _ g of the samples in the case of transition from a bulk powder to an NP is considered. The spectral and luminescence characteristics of the samples in the polycrystalline and nanoamorphous states are studied. It is shown that, in the case of transition to nanosamples, the ligand field around Eu^2+ changes. This may be due to the violation of the translational symmetry in the NP. The bond between the 4 f and 5 d electrons weakens. Degeneracy of the ^2 e _ g level appears. Presumably, the reduction of ions Eu^3+ → Eu^2+ in the electron beam due to the breaking of the Si(Ge)–O bond in the process of evaporation of the samples and capture of the released electron by the Eu^3+ ions is found.

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Section: методика экспериментаunclassified

Section: Introductionunclassified

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Новые Наноразмерные Люминофоры, Полученные Испарением Силикатов И Германатов РЗЭ

Зуев¹,

Ильвес²,

Соковнин³

et al. 2019

Физика Твердого Тела

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“…Lin's group reported a single‐component white‐emitting phosphor via energy transfer from Bi 3+ to Eu 3+ ions in Sr 2 Y 8 (SiO 4 ) 6 O 2 . For Sr 2 Gd 8 (SiO 4 ) 6 O 2 (SGSO), only Eu 3+ , Tb 3+ and Sm 3+ ions doping was reported ,…”

Section: Introductionmentioning

confidence: 99%

Sr₂Gd₈(SiO₄)₆O₂:Ce³⁺/Mn²⁺: A Single‐Component White‐Light‐Emitting Phosphor for UV W‐LEDs

et al. 2019

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an oxyapatite structure phosphor, was prepared through a high temperature solid state reaction method. The crystal structure, luminescence properties, and energy transfer mechanism of the samples were investigated in detail. Under the irradiation of 330 nm, tunable colors from blue to yellow, including white can be realized through the energy transfer from Ce 3 + to Mn 2 + ions. The energy transfer mechanism of Ce 3 + ! Mn 2 + was discussed and demonstrated to be a dipole-dipole interaction according to the results of the emission spectra and decay curves of the phosphors. Moreover, the thermal stability of the Ce 3 + and Mn 2 + co-doped Sr 2 Gd 8 (SiO 4 ) 6 O 2 phosphors were studied through the temperature-dependent emission spectra. The results suggest that Sr 2 Gd 8 (SiO 4 ) 6 O 2 :Ce 3 + /Mn 2 + maybe used as color tunable phosphors in white-light-emitting diodes (WLEDs) .

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“…Of interest is the effect of nanodimensional state of phosphors on radiationless losses and luminescence yield, on broadening and displacement of bands, on the variation in the structure of optical centers, as well as on vibrational spectra. Silicates with oxyapatite structure are known as effective matrices for luminescent materials if they are activated with RE ions [1][2][3][4][5][6][7][8]. There is no information in the literature about the production of nanophosphors based on silicates of the composition Cа 2 Y 8 (SiO 4 ) 6 O: Eu in amorphous state * .…”

Section: Introductionmentioning

confidence: 99%

Nanophosphors with Partially Polymerized SiO4 Tetrahedra Produced by Evaporation of Ca2Y8 (SiO4)6O2: Eu Polycrystals

Зуев¹

2017

AJMSP

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Nanophosphors in the amorphous state were produced for the first time by pulsed electron beam evaporation of micrometer-sized polycrystalline phosphors of the composition Cа 2 Y 8 (SiO 4 ) 6 O 2 : Eu. It was found that the Raman spectrum is modified and the forbidden band width of the samples increases when the particle size lowers from micro-to nanodimensional state. The spectral luminescent characteristics in polycrystalline and amorphous states have been examined. It was established that during the transition to nanoamorphous state the phosphors change their photoluminescence color from red-orange (Eu 3+ ) to blue (Eu 2+ ).

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Spectral characteristics of nanoamorphous phosphors obtained by evaporation of Sr2Gd8(SiO4)6O2: Eu polycrystals

Cited by 17 publications

References 20 publications

Новые Наноразмерные Люминофоры, Полученные Испарением Силикатов И Германатов РЗЭ

Новые Наноразмерные Люминофоры, Полученные Испарением Силикатов И Германатов РЗЭ

Sr₂Gd₈(SiO₄)₆O₂:Ce³⁺/Mn²⁺: A Single‐Component White‐Light‐Emitting Phosphor for UV W‐LEDs

Nanophosphors with Partially Polymerized SiO<sub>4</sub> Tetrahedra Produced by Evaporation of Ca<sub>2</sub>Y<sub>8</sub> (SiO<sub>4</sub>)<sub>6</sub>O<sub>2</sub>: Eu Polycrystals

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Spectral characteristics of nanoamorphous phosphors obtained by evaporation of Sr2Gd8(SiO4)6O2: Eu polycrystals

Cited by 17 publications

References 20 publications

Новые Наноразмерные Люминофоры, Полученные Испарением Силикатов И Германатов РЗЭ

Новые Наноразмерные Люминофоры, Полученные Испарением Силикатов И Германатов РЗЭ

Sr2Gd8(SiO4)6O2:Ce3+/Mn2+: A Single‐Component White‐Light‐Emitting Phosphor for UV W‐LEDs

Nanophosphors with Partially Polymerized SiO&lt;sub&gt;4&lt;/sub&gt; Tetrahedra Produced by Evaporation of Ca&lt;sub&gt;2&lt;/sub&gt;Y&lt;sub&gt;8&lt;/sub&gt; (SiO&lt;sub&gt;4&lt;/sub&gt;)&lt;sub&gt;6&lt;/sub&gt;O&lt;sub&gt;2&lt;/sub&gt;: Eu Polycrystals

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Sr₂Gd₈(SiO₄)₆O₂:Ce³⁺/Mn²⁺: A Single‐Component White‐Light‐Emitting Phosphor for UV W‐LEDs

Nanophosphors with Partially Polymerized SiO<sub>4</sub> Tetrahedra Produced by Evaporation of Ca<sub>2</sub>Y<sub>8</sub> (SiO<sub>4</sub>)<sub>6</sub>O<sub>2</sub>: Eu Polycrystals