Preparation of long-afterglow colloidal solution of Sr2MgSi2O7: Eu2+, Dy3+ by laser ablation in liquid

Yoshimura, Fumitaka; Nakamura, Kazutaka G.; Wakai, Fumihiro; Hara, Masahiko; Yoshimoto, Mamoru; Odawara, Osamu; Wada, Hiroo

doi:10.1016/j.apsusc.2010.09.067

Cited by 38 publications

(28 citation statements)

References 21 publications

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“…Highly crystalline nanoparticles were prepared in this method. Similar phenomena were observed in previous studies [21][22][23]. Several mechanisms of preparing nanoparticles were considered.…”

Section: Resultssupporting

confidence: 71%

Photon-Avalanche Effect of Y2O3:Er,Yb Nanoparticles Prepared by Laser Ablation in Liquid

Onodera

Nunokawa

Odawara

et al. 2013

Trans. Mat. Res. Soc. Japan

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Optical properties of upconversion nanoparticles Y 2 O 3 :Er,Yb were investigated. The upconversion nanoparticles were prepared by laser ablation in liquid, which was one of the promising plasma processes to fabricate nanoparticle-dispersed solution. Highly crystalline nanoparticles with particle size of 11±3 nm were observed by electron microscope. Upconversion spectra with an excitation of 980 nm were measured by fluorescence spectrophotometer. Photon-avalanche effect of the nanoparticles, which significantly increased upconversion intensity, was observed. This phenomenon would be due to the increase in population at red emission by cross-relaxation. The ratio of red emission to green one was increased by the increase in the concentration of Yb in phosphor and the decrease in the excitation power.

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Section: Resultssupporting

confidence: 71%

Photon-Avalanche Effect of Y2O3:Er,Yb Nanoparticles Prepared by Laser Ablation in Liquid

Onodera

Nunokawa

Odawara

et al. 2013

Trans. Mat. Res. Soc. Japan

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“…Doped ZnO nanoparticles may be fabricated by using a sintered disk made of appropriate mixed powder. One report is found on fabrication of functional nanoparticles of complex compositions in liquid-phase laser ablation [18]. In this reference, Sr 2 MgSi 2 O 7 :Eu 2+ , Dy 3+ nanoparticles were obtained.…”

Section: Introductionmentioning

confidence: 99%

Red luminescence of Eu3+ doped ZnO nanoparticles fabricated by laser ablation in aqueous solution

et al. 2012

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Fabrication of Eu 3+ -doped ZnO nanoparticles by laser ablation in liquid medium is reported. Sintered disks made of mixed powders of ZnO and Eu 2 O 3 are used for targets, and surfactant of sodium dodecyl sulfate or LiOH is included in solution. Round-shaped nanoparticles with the diameter of 5∼30 nm are synthesized. When the ZnO host is photoexcited, broad green photoluminescence (PL) of oxygen vacancies in the ZnO host as well as red PL of Eu 3+ is observed at room temperature. The red PL peak of Eu 3+ included in the ZnO host lattice is different from that of the source material of Eu 2 O 3 . Energy transfer from the ZnO host to Eu 3+ is demonstrated in site-selectively excited PL spectra and its excitation spectra. This result shows that the liquid-phase laser ablation is useful for doping active centers into nanoparticles.

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“…Many defects exist on the surface and adversely affect the optical properties of particles by nonradiative relaxation through the energy levels of surface defects and/or energy transfer to water molecules [13,15]. Silica-capping is one of the most effective ways of passivating the surfaces of nanoparticles and improving their optical properties [16].…”

Section: Introductionmentioning

confidence: 99%

“…One promising method is laser ablation in a liquid [10][11][12]. Sr 2 MgSi 2 O 7 :Eu,Dy nanoparticles have been successfully formed by this method [13]. However, the optical properties of Sr 2 MgSi 2 O 7 :Eu,Dy nanoparticles are degraded due to nanosizing.…”

Section: Introductionmentioning

confidence: 99%

Afterglow Properties of Silica-Capped Sr2MgSi2O7:Eu,Dy Nanoparticles Prepared by Laser Ablation in Ethanol

Ishizaki¹,

Fuchigami²,

Katagiri³

et al. 2012

CheM

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The effect of silica-capping on the afterglow property of Sr 2 MgSi 2 O 7 :Eu,Dy nanoparticles was investigated. Sr 2 MgSi 2 O 7 :Eu,Dy nanoparticles were prepared by laser ablation in liquid. Afterglow nanoparticles were capped with silica using Stöber method. A dense silica capping layer was achieved after 4 hours of reaction. Silica-capping of the afterglow nanoparticles improved the particles' afterglow property, which was degraded by nanosizing. Decay curves indicated that initial values of afterglow intensity were increased with silica-capping capacity. Moreover, silica-capping decreased the decay curve constant γ, which was related to trap parameters. The decrease in the value of γ resulted in the reduction in the slope of decay curve, and thus the improvement of the afterglow property. We concluded that capping nanoparticles with silica improved the particles' afterglow property by the passivation of surface defects and the prevention of energy transfer to water molecules.

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Preparation of long-afterglow colloidal solution of Sr2MgSi2O7: Eu2+, Dy3+ by laser ablation in liquid

Cited by 38 publications

References 21 publications

Photon-Avalanche Effect of Y<sub>2</sub>O<sub>3</sub>:Er,Yb Nanoparticles Prepared by Laser Ablation in Liquid

Photon-Avalanche Effect of Y<sub>2</sub>O<sub>3</sub>:Er,Yb Nanoparticles Prepared by Laser Ablation in Liquid

Red luminescence of Eu3+ doped ZnO nanoparticles fabricated by laser ablation in aqueous solution

Afterglow Properties of Silica-Capped Sr2MgSi2O7:Eu,Dy Nanoparticles Prepared by Laser Ablation in Ethanol

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