A5084315923- Luminescence Properties of Advanced Materials
- Radiation Detection and Scintillator Technologies
- Glass properties and applications
- Atomic and Subatomic Physics Research
- Perovskite Materials and Applications
- Nuclear materials and radiation effects
- Advanced Radiotherapy Techniques
- Semiconductor materials and devices
- Radiation Therapy and Dosimetry
- Medical Imaging Techniques and Applications
- Neutrino Physics Research
- Nuclear Physics and Applications
- Lanthanide and Transition Metal Complexes
- Solid State Laser Technologies
- Solid-state spectroscopy and crystallography
- Dark Matter and Cosmic Phenomena
- Silicon Nanostructures and Photoluminescence
- Inorganic Fluorides and Related Compounds
- Terahertz technology and applications
- Nanoplatforms for cancer theranostics
- Ga2O3 and related materials
- Electronic and Structural Properties of Oxides
- Photorefractive and Nonlinear Optics
- Mineralogy and Gemology Studies
- ZnO doping and properties
University of Milano-Bicocca
2015-2025
Istituto Nazionale di Fisica Nucleare, Sezione di Milano Bicocca
2009-2022
Istituto Nazionale di Fisica Nucleare, Sezione di Milano
2004-2022
Mylan (Switzerland)
2018
Istituto Officina dei Materiali
2018
University of Trieste
2016
University of Milan
2001-2013
Istituto di Fotonica e Nanotecnologie
2011
University of Parma
2006-2010
National Interuniversity Consortium for the Physical Sciences of Matter
2006-2008
We employ a combination of first-principles calculations and optical characterization experiments to explain the mechanism by which Ga${}^{3+}$ doping prevents trapping free carriers due shallow traps in RE${}_{3}$Al${}_{5}$O${}_{12}$ garnet scintillators (where RE represents $3+$ rare-earth cation). Specifically, we confirm that does not reduce defect concentration (defect engineering), but rather leads shifts valence conduction bands such energy level defects is no longer forbidden gap...
Large Stokes shift fast emitters show a negligible reabsorption of their luminescence, feature highly desirable for several applications such as fluorescence imaging, solar-light managing, and fabricating sensitive scintillating detectors medical imaging high-rate high-energy physics experiments. Here we obtain high efficiency luminescence with significant by exploiting fluorescent conjugated acene building blocks arranged in nanocrystals. Two ligands equal molecular length connectivity, yet...
Abstract Natural and anthropogenic gas radionuclides such as radon, xenon, hydrogen krypton isotopes must be monitored to managed pathogenic agents, radioactive diagnostic agents or nuclear activity indicators. State-of-the-art detectors based on liquid scintillators suffer from laborious preparation limited solubility for gases, which affect the accuracy of measurements. The actual challenge is find solid scintillating materials simultaneously capable concentrating gases efficiently...
Abstract Absorption, radioluminescence and thermoluminescence spectra were measured for a set of Lu 3 Al 5 O 12 :Ce samples consisting bulk single crystal Liquid Phase Epitaxy‐grown films prepared from the same raw materials. The triple peak structure within 120–200 K distinguished in thermolu‐ minescence glow curves crystals was ascribed to an electron trap arising due antisite defect. depth associated with dominant at 142 evaluated using initial rise method. (© 2005 WILEY‐VCH Verlag GmbH...
Abstract An overview of recognized structural defects, impurities and related trapping levels their role in the scintillation mechanism is provided discussed single crystal materials belonging to tungstate, Ce‐ or Pr‐doped aluminum perovskite, garnet finally Ce‐doped silicate scintillators. New achievements open problems deeper understanding electron hole self‐trapping phenomena nature defects structure ability localize migrating charge carriers are indicated. Fast optical ceramics...
Thermally stimulated luminescence (TSL) glow curves and emission spectra were studied in undoped Ce-doped ${\mathrm{Lu}}_{3}{\mathrm{Al}}_{5}{\mathrm{O}}_{12}$ single crystals by wavelength resolved TSL measurements the $10--310\phantom{\rule{0.3em}{0ex}}\mathrm{K}$ temperature range. Isothermal phosphorescence $10--100\phantom{\rule{0.3em}{0ex}}\mathrm{K}$ range also performed, which point to existence of a tunneling-driven radiative recombination process. These processes can explain...
We present an investigation of defects acting as electron traps in ${\text{Lu}}_{2}{\text{SiO}}_{5}$ (LSO) and ${\text{Lu}}_{x}{\text{Y}}_{2\ensuremath{-}x}{\text{SiO}}_{5}$ (LYSO) performed by wavelength-resolved thermally stimulated luminescence (TSL) measurements from 20 to $400\text{ }\ifmmode^\circ\else\textdegree\fi{}\text{C}$ after room-temperature (RT) x-ray irradiation. Single crystals doped with several rare-earth ions such Ce, Tb, Tm, Sm were considered. A comparison between TSL...
We investigate and compare optical absorption, luminescence scintillation properties of Pr-doped Y3Al5O12, Lu3Al5O12, Y2SiO5 Lu2SiO5 single crystals. The processes determining the kinetics fast Pr3+ 5d–4f radiative transition are described. Among studied host materials, only Lu3Al5O12 presents neither any 5d1–4f state nonradiative quenching nor ionization at room temperature. evaluate figure merit all materials for application as scintillators. most promising system appears to be : Pr, since...
The recent advent of Lu 3 Al 5 O 12 :Ce optical ceramics marks a turning point in scintillator material technology. Because their lower preparation temperature, brightness, and robustness such materials can now compete with single crystals. Their further scintillation efficiency optimization includes the thorough control defects responsible for losses. choice sintering agent appears critical to achieve both high transparency performance. In this work, investigations coupled X‐ray absorption...
The use of scintillators for the detection ionizing radiation is a critical aspect in many fields, including medicine, nuclear monitoring, and homeland security. Recently, lead halide perovskite nanocrystals (LHP-NCs) have emerged as promising scintillator materials. However, difficulty affordably upscaling synthesis to multigram level embedding NCs optical-grade nanocomposites without compromising their optical properties still limits widespread use. In addition, fundamental aspects...
Pr-doped Lu3(GaxAl1−x)5O12:Pr, x=0–1, single crystals were grown by the micro-pulling-down method. We study luminescence and scintillation characteristics of sample set focusing on their dependence gallium content. For x=0.4 we obtain high figure-of-merit material with elevated density, efficiency, very fast response below 20ns without any slower components. Improvement performance is explained as due to absence antisite LuAl defects that was for first time realized in such bulk garnet from...
The changes in the absorption spectra induced by Co60 irradiation and high temperature annealing was studied for selected PbWO4 crystals. Based on radiation annealings spectra, four color centers are proposed, which could be responsible shaping spectrum of crystals below 3.6 eV, namely Pb3+, O−, F, F+ centers. Thermoluminescence (TSL) glow curves above room were also these samples to determine further trap levels resulting from irradiation. Correlation between results obtained TSL is discussed.
A radioluminescent (RL) dosimetric system, based on a SiO2 optical fiber with the core doped by Ce3+ ions as luminescent activators has been investigated. Structural and properties of have studied Raman, refractive index, RL scintillation time decay measurements, compared to those obtained bulk material. The response composite made short portion active Ce-doped coupled long commercial one investigated x-ray irradiation. linear intensity found in dose rate interval 6×10−3–40mGy∕s together...
In this work a strategy for the control of structure and optical properties inorganic luminescent oxide-based nanoparticles is presented. The nonaqueous sol–gel route found to be suitable synthesis hafnia their doping with rare earths (RE) ions, which gives rise luminescence either under UV X-ray irradiation. Moreover, we have revealed capability technique achieve low-temperature stabilization cubic phase through effective incorporation trivalent RE ions into crystal lattice. Particular...
Defect engineering operated on metal oxides by chemical and structural modifications may strongly affect properties suitable for various applications such as photoelectrochemical behavior, charge transport, luminescence. In this work, we report the tunable optical features observed in undoped monoclinic HfO2 nanocrystals their dependence of material at nanoscale. Transmission electron microscopy together with X-ray diffraction surface area measurements were used to determine fine...
Photo- and radioluminescence, decay kinetics, thermoluminescence are reported for a set of Ce3+-doped phosphate glasses. The presence Gd3+ ions in the glass host matrix at concentrations above 20% enhances energy transfer towards Ce3+ emission centers, which results remarkable enhancement radioluminescence light output.
Spectrally resolved thermostimulated-luminescence (TSL) measurements have been carried out on samples of synthetic quartz, submitted to different treatments in order change the type charge compensation at substitutional aluminum sites. Near-infrared (NIR) optical absorption, electron paramagnetic resonance (EPR), and ac ionic conductivity performed monitor kinetics defects involved treatments. A specific treatment, consisting a prolonged high-temperature annealing vacuum (10 h 1400...