Fabrication of highly efficient ZnO nanoscintillators

Procházková, Lenka; Gbur, Tomáš; Čuba, Václav; Jarý, V.; Nikl, M.

doi:10.1016/j.optmat.2015.07.001

Cited by 36 publications

(27 citation statements)

References 32 publications

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“…Quantum yield of ZnO:Ga luminescence, however, is certainly much less than 1 at room temperature. It follows from its temperature dependence [12]. The amplitude of fast near UV emission band at room temperature with respect to that at 8K decreases by about one and half order of magnitude.…”

Section: Fig 5 Non-radiative Energy Transfer Between Polystyrene Mamentioning

confidence: 91%

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Preparation and luminescence properties of ZnO:Ga – polystyrene composite scintillator

Burešová¹,

Procházková²,

Turtós³

et al. 2016

Opt. Express

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Highly luminescent ZnO:Ga-polystyrene composite (ZnO:Ga-PS) with ultrafast subnanosecond decay was prepared by homogeneous embedding the ZnO:Ga scintillating powder into the scintillating organic matrix. The powder was prepared by photo-induced precipitation with subsequent calcination in air and Ar/H₂ atmospheres. The composite was subsequently prepared by mixing the ZnO:Ga powder into the polystyrene (10 wt% fraction of ZnO:Ga) and press compacted to the 1 mm thick pellet. Luminescent spectral and kinetic characteristics of ZnO:Ga were preserved. Radioluminescence spectra corresponded purely to the ZnO:Ga scintillating phase and emission of polystyrene at 300-350 nm was absent. These features suggest the presence of non-radiative energy transfer from polystyrene host towards the ZnO:Ga scintillating phase which is confirmed by the measurement of X-ray excited scintillation decay with picosecond time resolution. It shows an ultrafast rise time below the time resolution of the experiment (18 ps) and a single-exponential decay with the decay time around 500 ps.

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Section: Fig 5 Non-radiative Energy Transfer Between Polystyrene Mamentioning

confidence: 91%

“…The highly luminescent ultrafast ZnO:Ga powder (linear crystallite size 80-100 nm, size of the particle agglomerates ~1 µm) was prepared using photochemical method described in detail elsewhere [12]. Commercially available ZnO (Aldrich, 99.999% trace metal basis) was dissolved in aqueous solution of formic acid (Penta, p.a.)…”

Section: Methodsmentioning

confidence: 99%

Preparation and luminescence properties of ZnO:Ga – polystyrene composite scintillator

Burešová¹,

Procházková²,

Turtós³

et al. 2016

Opt. Express

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“…ZnO:Ga 3+ is a well-known scintillator with extremely fast emission in the UV spectral region, wide band gap (3.4 eV), relatively high exciton binding energy EB (60 meV), low aerglow and especially extremely short luminescence decay of excitons (subns) 1 with practically zero rise time. 2 While there are many different methods for preparation of luminescent ZnO nanocrystals, [3][4][5][6] the materials prepared via photo-induced methods seem to feature the most favourable fast timing characteristics.…”

Section: Introductionmentioning

confidence: 99%

“…2 While there are many different methods for preparation of luminescent ZnO nanocrystals, [3][4][5][6] the materials prepared via photo-induced methods seem to feature the most favourable fast timing characteristics. 1 Subsequent heat treatment of photo induced nanocrystals under specic conditions 7 provides high-quality scintillators with strong exciton-related emission and without any defectrelated emission in visible spectral range. 1 However, it comes at the cost of increased particle size.…”

Section: Introductionmentioning

confidence: 99%

“…1 Subsequent heat treatment of photo induced nanocrystals under specic conditions 7 provides high-quality scintillators with strong exciton-related emission and without any defectrelated emission in visible spectral range. 1 However, it comes at the cost of increased particle size. For practical use in most applications, the nanopowder needs to be embedded in a suitable optically transparent matrix, but increased particle size results in low transparency of fabricated composite.…”

Section: Introductionmentioning

confidence: 99%

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Core–shell ZnO:Ga-SiO₂ nanocrystals: limiting particle agglomeration and increasing luminescence via surface defect passivation

et al. 2019

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Self‐Assembled Colloidal Photonic Structures for Directional Radioluminescence of Gd and Ta Oxide Scintillators

Strassberg,

Nakanishi,

Shamaev

et al. 2024

Advanced Optical Materials

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Radiation detection is being revolutionized by integrating photonic elements into scintillators. In this study, a scalable and cost‐effective method is proposed to achieve tuneable emission enhancement across the visible spectrum by colloidal self‐assembly of photonic crystals on scintillator surfaces. This concept is demonstrated for Eu3+/Tb3+‐doped Gd and Ta oxides. Widely available and affordable colloidal nanospheres of SiO2 or polymethyl methacrylate are self‐assembled on these scintillators. The size of the nanospheres is carefully optimized to match the desired emission lines of Eu3+/Tb3+. The result is homogeneous and closely‐packed structures with clear photonic bandgap in the visible range. Under X‐ray excitation, the scintillators covered with the photonic layers exhibit enhanced light extraction in the direction perpendicular to the surface, compared to isotropic emission in the bare scintillator. Such scintillation directionality, when optically matched with a proper detector, will result in higher efficiency of the overall detection system. Moreover, X‐ray imaging demonstrates an enhancement of 25% in system resolution of the scintillator supplemented with the photonic layer compared to unmodified scintillators. The proposed method is scintillator‐ and nanosphere‐agnostic, thus offering a promising versatile approach for directing the scintillation light toward a photodetector and increasing detection system performance, including high‐resolution imaging applications.

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Fabrication of highly efficient ZnO nanoscintillators

Cited by 36 publications

References 32 publications

Preparation and luminescence properties of ZnO:Ga – polystyrene composite scintillator

Preparation and luminescence properties of ZnO:Ga – polystyrene composite scintillator

Core–shell ZnO:Ga-SiO₂ nanocrystals: limiting particle agglomeration and increasing luminescence via surface defect passivation

Self‐Assembled Colloidal Photonic Structures for Directional Radioluminescence of Gd and Ta Oxide Scintillators

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Fabrication of highly efficient ZnO nanoscintillators

Cited by 36 publications

References 32 publications

Preparation and luminescence properties of ZnO:Ga – polystyrene composite scintillator

Preparation and luminescence properties of ZnO:Ga – polystyrene composite scintillator

Core–shell ZnO:Ga-SiO2 nanocrystals: limiting particle agglomeration and increasing luminescence via surface defect passivation

Self‐Assembled Colloidal Photonic Structures for Directional Radioluminescence of Gd and Ta Oxide Scintillators

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Core–shell ZnO:Ga-SiO₂ nanocrystals: limiting particle agglomeration and increasing luminescence via surface defect passivation