Yolk–shell structured Y2O3:Eu3+ phosphor powders with enhanced photoluminescence properties prepared by spray pyrolysis

Cho, Jung Sang; Yang, Kwang Min; Kang, Yun Chan

doi:10.1039/c4ce00535j

Cited by 13 publications

(11 citation statements)

References 39 publications

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“…For the products obtained through solvothermal method, the XRD results indicate that all products exhibit anatase phase with good crystallinity. As is known, the yolk‐shell structures with core@void@shell configuration possess multiple light‐reflecting and scattering effect, which would improve the utilization of light . Although the core‐shell structure with the smallest BET value, the emission intensity of yolk‐shell structure is stronger than that of core‐shell structure, which confirmed the leading role of light utilization.…”

Section: Resultsmentioning

confidence: 99%

SiO₂@TiO₂:Sm³⁺ with Diverse Phase Structure and Morphology: Photoluminescence and Simulated Solar Light‐Activated Photodegradation Properties

et al. 2019

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Sm3+ doped SiO2@TiO2 nanospheres with diverse morphology have been successfully prepared. The size of SiO2 could be adjusted not only by changing the etching time but also through varying the coating method of TiO2. Sol‐gel and solvothermal methods were adopted to investigate the effect of coating conditions on morphology and properties of the products. Photocatalytic results showed that core‐shell structures obtained by solvothermal method possess the highest photodegradation efficiency, which reached 98% for degradation of methyl orange within 30 min under simulated solar light irradiation. The trapping experiments were performed and the possible photocatalytic mechanism was proposed. Yolk‐shell structures obtained through solvothermal method exhibited the strongest orange‐red emission intensity, however, for the samples obtained through a sol‐gel process, the luminescence intensities of the products showed the oppose trend, which is the result of a combination of light utilization, specific surface area and crystallinity. In addition, the X‐ray diffraction analysis results of products calcined at 900 °C manifested that a certain amount of Sm3+ ions inhibit the formation of rutile phase effectively, but the inhibitory effect is not proportional to its concentration. This article provides deeper insight into photocatalytic and luminescence bi‐functional properties of SiO2@TiO2:Sm3+ nanospheres with diverse morphology obtained through different preparation methods.

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Section: Resultsmentioning

confidence: 99%

SiO₂@TiO₂:Sm³⁺ with Diverse Phase Structure and Morphology: Photoluminescence and Simulated Solar Light‐Activated Photodegradation Properties

et al. 2019

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“…However, the yolk@shell phosphor particles have a greater surface area for photoluminescence emission, including the outer and inner surfaces of the shell and the outer surface of the yolk. That is, photoluminescence emission occurred from UV excitation of the outer surface of the shell, and additionally the excitation light also penetrated the shell layer, which caused photoluminescence emission from the inner surface of the shell and outer surface of the yolk . As a result, the photoluminescence intensity of the yolk@shell phosphor particles was significantly amplified.…”

Section: Resultsmentioning

confidence: 99%

“…That is, photoluminescence emission occurredf rom UV excitation of the outer surface of the shell,a nd additionally the excitation light also penetrated the shell layer,w hich caused photoluminescence emission from the inner surface of the shell and outer surface of the yolk. [48] As ar esult, the photoluminescence intensity of the yolk@shell phosphorp articles was significantly amplified. This explanation was supported by the specific surface area of the phosphor particles.…”

Section: (Bamg)sio 4 :Eu 3 + + Phosphor With Yolk@shell Structurementioning

confidence: 89%

Template‐Engaged Solid‐State Synthesis of Barium Magnesium Silicate Yolk@Shell Particles and Their High Photoluminescence Efficiency

Chen

Kim

2016

Chemistry A European J

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This study presents a new synthetic method for fabricating yolk@shell-structured barium magnesium silicate (BMS) particles through a template-engaged solid-state reaction. First, as the core template, (BaMg)CO3 spherical particles were prepared based on the coprecipitation of Ba(2+) and Mg(2+) . These core particles were then uniformly shelled with silica (SiO2 ) by using CTAB as the structure-directing template to form (BaMg)CO3 @SiO2 particles with a core@shell structure. The (BaMg)CO3 @SiO2 particles were then converted to yolk@shell barium magnesium silicate (BMS) particles by an interfacial solid-state reaction between the (BaMg)CO3 (core) and the SiO2 (shell) at 750 °C. During this interfacial solid-state reaction, Kirkendall diffusion contributed to the formation of yolk@shell BMS particles. Thus, the synthetic temperature for the (BaMg)SiO4 :Eu(3+) phosphor is significantly reduced from 1200 °C with the conventional method to 750 °C with the proposed method. In addition, the photoluminescence intensity of the yolk@shell (BaMg)SiO4 :Eu(3+) phosphor was found to be 9.8 times higher than that of the conventional (BaMg)SiO4 :Eu(3+) phosphor. The higher absorption of excitation light by the structure of the yolk@shell phosphor is induced by multiple light-reflection and -scattering events in the interstitial void between the yolk and the shell. When preparing the yolk@shell (BaMg)SiO4 :Eu(3+) phosphor, a hydrogen environment for the solid-state reaction results in higher photoluminescence efficiency than nitrogen and air environments. The proposed synthetic method can be easily extended to the synthesis of other yolk@shell multicomponent metal silicates.

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“…The mesoporous structure not only possesses large surface area for absorbing excitation light but also enables multiple light reflection and scattering between the pores. Both of them contribute to improving light emission and enhancing photoluminescence efficiency [26]. When the calcined temperature increases to 800°C, the enhanced PL intensity decreases to 30 %, attributing to the collapse of the mesoporous.…”

Section: Characterizationmentioning

confidence: 99%

Facile preparation and fluorescence enhancement of mesoporous Eu-doped-Y2O3 phosphors

Chen

Tao

Yang

et al. 2015

J Mater Sci: Mater Electron

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Mesoporous europium-doped yttrium oxide phosphors were successfully synthesized by a simple Pechini sol-gel method. The prepared powders were characterized by X-ray diffraction, scanning electron microscopy, Surface area and pore size analyzer and fluorescence spectrophotometer. The XRD spectrum of the calcined samples confirm the presence of Y 2 O 3 . The surface area and pore size analyzer was employed to demonstrate the existence of mesoporous structure in these samples. The room temperature photoluminescence (PL) emissions of Y 2 O 3 :Eu samples can be observed under 245 nm excitation. PL results show that the emission intensity of as-prepared mesoporous Y 2 O 3 :Eu phosphors are higher than that of particles without special structures. Large surface area and pores play an important role in the increasing of PL intensity. The intensity ratio between 5 D 0 ? 7 F 2 and 5 D 0 ? 7 F 1 transitions which related to the local environment of Eu 3? were also studied.

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Yolk–shell structured Y2O3:Eu3+ phosphor powders with enhanced photoluminescence properties prepared by spray pyrolysis

Cited by 13 publications

References 39 publications

SiO₂@TiO₂:Sm³⁺ with Diverse Phase Structure and Morphology: Photoluminescence and Simulated Solar Light‐Activated Photodegradation Properties

SiO₂@TiO₂:Sm³⁺ with Diverse Phase Structure and Morphology: Photoluminescence and Simulated Solar Light‐Activated Photodegradation Properties

Template‐Engaged Solid‐State Synthesis of Barium Magnesium Silicate Yolk@Shell Particles and Their High Photoluminescence Efficiency

Facile preparation and fluorescence enhancement of mesoporous Eu-doped-Y2O3 phosphors

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Yolk–shell structured Y2O3:Eu3+ phosphor powders with enhanced photoluminescence properties prepared by spray pyrolysis

Cited by 13 publications

References 39 publications

SiO2@TiO2:Sm3+ with Diverse Phase Structure and Morphology: Photoluminescence and Simulated Solar Light‐Activated Photodegradation Properties

SiO2@TiO2:Sm3+ with Diverse Phase Structure and Morphology: Photoluminescence and Simulated Solar Light‐Activated Photodegradation Properties

Template‐Engaged Solid‐State Synthesis of Barium Magnesium Silicate Yolk@Shell Particles and Their High Photoluminescence Efficiency

Facile preparation and fluorescence enhancement of mesoporous Eu-doped-Y2O3 phosphors

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SiO₂@TiO₂:Sm³⁺ with Diverse Phase Structure and Morphology: Photoluminescence and Simulated Solar Light‐Activated Photodegradation Properties

SiO₂@TiO₂:Sm³⁺ with Diverse Phase Structure and Morphology: Photoluminescence and Simulated Solar Light‐Activated Photodegradation Properties