Luminescence and Scintillation Properties at the Nanoscale

Dujardin, Christophe; Amans, David; Belsky, A.; Chaput, Frédéric; Ledoux, Gilles; Pillonnet, Anne

doi:10.1109/tns.2009.2035697

Cited by 77 publications

(53 citation statements)

References 79 publications

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“…Luminescent NPs—metals, semiconductors, or insulators—have come to the forefront in modern solid state physics, lighting, next generation electronics, and sensing, in the environmental and life science, as well as in medical and biological fields . In particular, extensive theoretical and spectroscopic studies of the optical response of inorganic luminescent NPs have been proving the suitability of these systems in the field of phosphors and scintillators for lighting and radiation detection applications . For instance, defect‐engineering strategies can be applied in wide bandgap nanomaterials.…”

Section: Introductionmentioning

confidence: 99%

The Bright X‐Ray Stimulated Luminescence of HfO₂ Nanocrystals Activated by Ti Ions

Villa

Moretti

Fasoli

et al. 2019

Advanced Optical Materials

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The recent trends in scintillator technologies stimulate research efforts toward the development of novel materials morphologies, such as nanoparticles, able to efficiently convert ionizing radiations into light. For example, scintillating nanoparticles attract great interest in medical oncological therapies. In this work, the structural and morphological properties of HfO2:Ti nanoparticles with Ti concentrations from 0.03 to 10 mol% and subjected to calcination up to 1000 °C are thoroughly characterized; moreover, X‐ray photoelectron spectroscopy reveals the incorporation of Ti in both Ti (III) and Ti (IV) chemical states in as prepared samples, while the exclusive presence of Ti(IV) is unambiguously identified in calcined nanoparticles. The optical emission under X‐ray excitation evidences an intense Ti (IV)‐related luminescence at 2.5 eV in high temperature calcined samples with a few microseconds scintillation lifetime, and efficiency comparable to that of Bi4Ge3O12 reference scintillator. Finally, the competitive role of defects in charge carriers capture is demonstrated by the monotonic increase of the 2.5 eV band during prolonged X‐ray irradiation, more evident for nanoparticles with titanium concentration below 1 mol%. HfO2:Ti may also find application in X‐ray triggered oncological therapies by using the Ti (IV)‐related bright radioluminescence to excite photosensitizer molecules for singlet oxygen generation.

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Section: Introductionmentioning

confidence: 99%

The Bright X‐Ray Stimulated Luminescence of HfO₂ Nanocrystals Activated by Ti Ions

Villa

Moretti

Fasoli

et al. 2019

Advanced Optical Materials

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“…i,ii,iii,iv In addition, the screen can be made much thicker for high stopping power without losing any light by scattering because nanophosphor-containing composite remains highly transparent due to the negligible scattering from nanoparticles. v,vi,vii,viii With a glass as the matrix material for embedding the nanophosphors, the scintillator screen will be chemically and mechanically stable, and can be easily shaped into large-area plates for applications in adverse environments. ix …”

Section: Introductionmentioning

confidence: 99%

Synthesis and luminescence properties of transparent nanocrystalline GdF3:Tb glass-ceramic scintillator

Lee

Savage

Wagner

et al. 2014

Journal of Luminescence

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Transparent glass-ceramic containing rare-earth doped halide nanocrystals exhibits enhanced luminescence performance. In this study, a glass-ceramic with Tb doped gadolinium fluoride nanocrystals embedded in an aluminosilicate glass matrix is investigated for X-ray imaging applications. The nanocrystalline glass-ceramic scintillator was prepared by a melt-quench method followed by an anneal. The GdF3:Tb nanocrystals precipitated within the oxide glass matrix during the processing and their luminescence and scintillation properties were investigated. In this nanocomposite scintillator system, the incorporation of high atomic number Gd compound into the glass matrix increases the X-ray stopping power of the glass scintillator, and effective energy transfer between Gd3+ and Tb3+ ions in the nanocrystals enhances the scintillation efficiency.

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“…For particles less than 10 nm in diameter, the possibility of exploiting quantum confinement effects with their respective changes in electron transitions and spectral details [2,11,12] have been reported. Moreover, colloidal processing allows the production of deagglomerated nanoparticles to obtain fluorescent transparent dispersions that have applications such as security marks, as well as biomarkers [4,13,14,15,16,17].…”

Section: Introductionmentioning

confidence: 99%

Light Emission Intensities of Luminescent Y2O3:Eu and Gd2O3:Eu Particles of Various Sizes

et al. 2017

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There is great technological interest in elucidating the effect of particle size on the luminescence efficiency of doped rare earth oxides. This study demonstrates unambiguously that there is a size effect and that it is not dependent on the calcination temperature. The Y2O3:Eu and Gd2O3:Eu particles used in this study were synthesized using wet chemistry to produce particles ranging in size between 7 nm and 326 nm and a commercially available phosphor. These particles were characterized using three excitation methods: UV light at 250 nm wavelength, electron beam at 10 kV, and X-rays generated at 100 kV. Regardless of the excitation source, it was found that with increasing particle diameter there is an increase in emitted light. Furthermore, dense particles emit more light than porous particles. These results can be explained by considering the larger surface area to volume ratio of the smallest particles and increased internal surface area of the pores found in the large particles. For the small particles, the additional surface area hosts adsorbates that lead to non-radiative recombination, and in the porous particles, the pore walls can quench fluorescence. This trend is valid across calcination temperatures and is evident when comparing particles from the same calcination temperature.

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Luminescence and Scintillation Properties at the Nanoscale

Cited by 77 publications

References 79 publications

The Bright X‐Ray Stimulated Luminescence of HfO₂ Nanocrystals Activated by Ti Ions

The Bright X‐Ray Stimulated Luminescence of HfO₂ Nanocrystals Activated by Ti Ions

Synthesis and luminescence properties of transparent nanocrystalline GdF3:Tb glass-ceramic scintillator

Light Emission Intensities of Luminescent Y2O3:Eu and Gd2O3:Eu Particles of Various Sizes

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Luminescence and Scintillation Properties at the Nanoscale

Cited by 77 publications

References 79 publications

The Bright X‐Ray Stimulated Luminescence of HfO2 Nanocrystals Activated by Ti Ions

The Bright X‐Ray Stimulated Luminescence of HfO2 Nanocrystals Activated by Ti Ions

Synthesis and luminescence properties of transparent nanocrystalline GdF3:Tb glass-ceramic scintillator

Light Emission Intensities of Luminescent Y2O3:Eu and Gd2O3:Eu Particles of Various Sizes

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The Bright X‐Ray Stimulated Luminescence of HfO₂ Nanocrystals Activated by Ti Ions

The Bright X‐Ray Stimulated Luminescence of HfO₂ Nanocrystals Activated by Ti Ions