Development of Phase‐Separated Scintillators with Light‐Guiding Properties

Yasui, Norio; Ōhashi, Y.; Tamaki, Kunihiko; Den, Tohru

doi:10.1002/adma.201201962

Cited by 51 publications

(37 citation statements)

References 18 publications

(17 reference statements)

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“…Eutectic solidification enables crystallization of a two-phase solid, often with an interesting selforganized micro-/nanostructure (typical are rod-like and lamellar structures) from a miscible liquid phase at a certain temperature [25]. Eutectic composites have been investigated for various applications such as solar energy conversion [26][27][28], power generation gas turbines [29], scintillators [30,31] or second-harmonic generators [32]. The plasmonic effect was presented in a eutectic composite for the first time with a Bi 2 O 3 -Ag composite [21,22].…”

Section: Introductionmentioning

confidence: 99%

Evolution of silver in a eutectic-based Bi2O3–Ag metamaterial

et al. 2017

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The development of novel manufacturing techniques of nano-/micromaterials, especially metallodielectric materials, has enabled dynamic development of such fields as nanoplasmonics. However, the fabrication methods are still mostly based on time-consuming and costly top-down techniques limited to two-dimensional materials. Recently, directional solidification has been proposed and utilized for manufacturing of volumetric nanoplasmonic materials using the example of a Bi 2 O 3 -Ag eutectic-based nanocomposite. Here, we explain the evolution of silver in this composite, from the crystal growth through the post-growth annealing processes. Investigation with tunneling electron microscopy shows that silver initially enters the composite as an amorphous AgBiO 3 phase, which is formed as a wetting layer between the grains of Bi 2 O 3 primary phase. The post-growth annealing leads to decomposition of the amorphous phase into Bi 2 O 3 nanocrystals and intergranular Ag nanoparticles, providing the tunable localized surface plasmon resonance at yellow light wavelengths.

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Section: Introductionmentioning

confidence: 99%

Evolution of silver in a eutectic-based Bi2O3–Ag metamaterial

et al. 2017

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“…In matrix-guided PSSs, the 30% pore volume CuI crystal is a promising material for high-resolution X-ray imaging because its refractive index ratio (n m /n c ¼ 2.35) and pore volume are considerably higher than other eutectic systems. 18 Finally, high-resolution X-ray imaging was demonstrated with an 800-lm-thick 30% pore volume CuI crystal. Figure 5 shows images taken using a resolution chart of 0.05-mm-thick lead with a 10 lp/mm pattern.…”

Section: X-ray Imaging Resultsmentioning

confidence: 99%

“…[18][19][20] Two types of PSSs can be obtained, owing to the refractive index ratio (n m /n c ) of the cylinders (n c ) and the matrix (n m ): matrix-guided PSSs (n m /n c > 1) and cylinderguided PSSs (n m /n c < 1). Particularly, in matrix-guided PSSs, the light-guiding efficiency increases with the refractive index ratio (n m /n c ) and the cylinder volume fraction.…”

Section: X-ray Imaging Resultsmentioning

confidence: 99%

High-refractive-index CuI waveguide with aligned cylindrical micropores for high-resolution X-ray imaging

Ōhashi

Yasui

Den

2014

Journal of Applied Physics

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We have fabricated porous CuI crystals and used them as scintillator plates for high-resolution X-ray imaging by combining the properties of high-refractive-index light waveguide and scintillation. Porous CuI crystals containing aligned cylindrical micropores with pore volumes of 6% and 30% were fabricated by leaching directionally solidified CuI/NaCl and CuI/KCl eutectic crystals. The continuous cylindrical pores, which had a smooth surface, extended inward from the front to the back surface of the CuI crystal; therefore, light is confined in the CuI matrix with high refractive index (n ≈ 2.35) and transported along the pore direction by a total reflection mode. High-resolution X-ray imaging was demonstrated by using a 30% pore volume CuI crystal for an X-ray resolution chart and the 10 lp/mm pattern was clearly resolved.

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“…Halide and oxide eutectic materials composed of scintillators with rod-like microstructure and a surrounding matrix with higher refractive index such as CsI-NaCl:Tl þ [7,8] and α-Al 2 O 3 -GdAlO 3 :Ce 3 þ [9] have been developed for X-ray imaging,. Their excellent contrast transfer function (CTF) values indicate the scintillation light was transported to the surface of the eutectic scintillators with total reflection at the interface between scintillator and the matrix, and almost reached the theoretical resolution limit of the material itself.…”

Section: Introductionmentioning

confidence: 99%