Long lasting phosphorescence and photostimulated luminescence in Tb-ion-activated reduced calcium aluminate glasses

Kinoshita, Takeru; Yamazaki, Masaaki; Kawazoe, Hiroshi; Hosono, Hideo

doi:10.1063/1.371243

Cited by 106 publications

(48 citation statements)

References 13 publications

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“…Figure 7 shows decay curves of afterglow nanoparticles at each PEG concentration. Afterglow is caused by the recombination of the trapped carriers [14,[27][28][29][30][31]. For example, trapped holes migrate to the valence band using the thermal energy available at room temperature.…”

Section: Experimental Methodsmentioning

confidence: 99%

Optical Properties of Afterglow Nanoparticles : , Capped with Polyethylene Glycol

Yoshimura

Ishizaki

Wakai

et al. 2012

Advances in Optical Technologies

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The optical properties of afterglow nanoparticles were successfully improved by the addition of polyethylene glycol (PEG) to an afterglow colloidal solution. Afterglow nanoparticles-Sr 2 MgSi 2 O 7 : Eu 2+ , Dy 3+ -were prepared by laser ablation in liquid. The quantum yields and the decay curves were measured by a fluorescence spectrophotometer. An increase in the amount of PEG added to the solution increased the quantum yield of the nanoparticles and improved the afterglow property in the initial portion of the decay curve. However, the afterglow property did not change after a substantial amount of time had passed. The afterglow nanoparticles were capped with PEG molecules, and surface defects of the nanoparticles were passivated, which decreased the optical properties.

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Section: Experimental Methodsmentioning

confidence: 99%

Optical Properties of Afterglow Nanoparticles : , Capped with Polyethylene Glycol

Yoshimura

Ishizaki

Wakai

et al. 2012

Advances in Optical Technologies

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show abstract

“…The slurry method is the most common method, in which phosphor powder is mixed with photosensitive chemicals and is patterned using photolithography techniques. For operating voltages greater than 2 kV, the screen is back coated with a thin layer of aluminium which acts as an optical reflector as well as a charge dissipater [20][21][22]. At operating voltage below 2 kV, the electron penetration depth is so small that the screens are left un-coated [23][24][25].…”

Section: Introductionmentioning

confidence: 99%

Temperature dependence of structural and luminescence properties of Eu3+-doped Y2O3 red-emitting phosphor thin films by pulsed laser deposition

2016

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Pulse laser deposition was used to obtain nanocrystalline red-emitting Y 2 O 3 :Eu 3? thin-film phosphors. X-ray diffraction measurements show that the un-annealed thin film was amorphous, while those annealed were crystalline. At lower annealing temperature of 600-700°C, cubic bixbyite Y 2 O 3 :Eu 3? was formed. As the annealing temperatures were increased to 800°C, hexagonal phase emerged. The average crystallite size of the film was 64 nm. Photoluminescence measurement indicates intense red emission around 612 nm due to the 5 D 0 ? 7 F 2 transition. Scanning electron microscopy indicated that agglomerates of noncrystalline particles with spherical shapes were present for the un-annealed films. After annealing at high temperature, finer morphology was revealed. Atomic force microscopy further confirmed the formation of new morphology at the higher annealing temperatures. UV-Vis measurement indicated a band gap in the range of 4.6-4.8 eV. It was concluded that the annealing temperature played an important role in the luminescence intensity and crystallinity of these films.

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“…Since the afterglow material SrAl 2 O 4 ,Eu,Dy, which does not feature radioactive materials, was discovered in 1996, it has been used in the faces of watches [1]. The afterglow mechanism, which involves the recombination of electrons and holes trapped in shallow energy levels at room temperature, has been extensively studied [1][2][3][4][5][6]. Sr 2 MgSi 2 O 7 :Eu,Dy is known to be a water-insoluble afterglow material [7][8][9].…”

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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Long lasting phosphorescence and photostimulated luminescence in Tb-ion-activated reduced calcium aluminate glasses

Cited by 106 publications

References 13 publications

Optical Properties of Afterglow Nanoparticles : , Capped with Polyethylene Glycol

Optical Properties of Afterglow Nanoparticles : , Capped with Polyethylene Glycol

Temperature dependence of structural and luminescence properties of Eu3+-doped Y2O3 red-emitting phosphor thin films by pulsed laser deposition

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

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