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01-24-1958 Born in Busseto (PR)

03-24-1983 University Degree in Chemistry (magna cum laude) at the Faculty of Sciences, University of Parma. Thesis title: ‘The electronic spectrum of the Ni2+ ion in Ni2NbBO6 single crystals at 77 K’.
1984-1985 Military service
1986-1988 Job experiences in the cathode ray tubes and glass industries
1988-2000 Graduate Technician at the Chemical Physics Institute of the University of Parma, that in 1994 has joined the Department of General and Inorganic Chemistry, Analytical Chemistry and Physical Chemistry of the University of Parma.
2000- 2014 Assistant Professor (SSD CHIM/02) at the Department of General and Inorganic Chemistry, Analytical Chemistry and Physical Chemistry of the University of Parma, now Department of Chemistry of the University of Parma.
2014- today Associate Professor (SSD CHIM/02) at the Department of Chemistry of the University of Parma.

Prof. Cavalli joined the optical spectroscopy group of the Chemical Physics Institute in 1988, and was initially charged of the synthesis of oxide crystals containing ions of the first transition series, in particular Ni2+ e Cr3+, and of the measurement and analysis of their absorption spectra. After having ripened a significant skill and autonomy in this field, he started to investigate the luminescence properties of crystals doped with transition metal and lanthanide ions, activity that has yielded attractive results and is still in progress. The investigated crystals are usually constituted of an insulating host matrix, transparent in a wide spectral region (from UV to NIR), activated with optically active ions. The detailed knowledge of the energy levels structure of the active centres and of the fluorescence dynamics is fundamental in order to assess the perspectives of application of these materials.
Presently the work of Prof. Cavalli develops along three main research topics:
-optical spectroscopy of luminescent ions in non linear host lattices;
-charge transfer states and excited state dynamics in systems containing optically active ions;
-synthesis and characterization of luminescent materials for technological applications and diagnostics.

These investigations are carried out in the ambit of various scientific collaborations with italian and foreign research groups.
Prof. Cavalli has been visiting Professor at the Laboratoire des Materiaux Inorganiques dell’Università B. Pascal di Clermont-Ferrand in various periods between 2005 and 2012, and has taken part to two Italy-Spain integrated actions (2003-2004 e 2004-2005), in the ambit of which he has spent significant research periods at the Departamento de Fisica de Materiales, Universidad Autonoma de Madrid.
Since 2012 he collaborates with the ISTEC-CNR Institute of Faenza (Italy) in the development of luminescent ceramics.
Prof. Cavalli has published 123 papers on international scientific journals, and has attended at a number of international Conferences with more than 80 contributes. Presently his H-index is 26 (Source: Scopus, January 13, 2016).
He is a referee for a number of material science and optical spectroscopy journals.The most important are:
Journal of Luminescence
Optical Materials
Journal of Alloys and Compounds
Materials Research Bulletin
Journal of Crystal Growth
Journal of Solid State Chemistry
and so on.
He is Associate Editor of the Optical Material journal (Elsevier)

The research activity of Prof. Cavalli implies different phases, each of them requiring specific competences:
-sample synthesis
The samples in form of single crystals are grown by the flux growth technique, consisting in the slow cooling of molten salts solutions. This methodology has some advantages in comparison with those used for commercial crystals: versatilità, low cost, etc., even if the obtained materials are not suitable for practical applications. Nevertheless it is largely used for explorative purposes: the skill matured in these years has allowed Prof. Cavalli to set up the syntheses of new compounds.
Samples in form of micro- and nano-crystalline powders are synthesized by different methods: solid-state reaction, sol-gel, hydrothermal, etc., depending on the meterial and its perspective of utilization.
The characterization of the crystal structure of the grown crystals is essential for the study of their optical properties. In most cases it is sufficient to measure the powder XRD spectrum in order to confirm the expected structure. However when a new crystal phase is obtained, a X-ray diffraction study on single crystal becomes necessary. This is possible in the ambit of a collaboration with the Structural Chemistry Lab present of the Department of Chemistry.
-Spectroscopic measurements.
The laboratory of Prof. Cavalli is well equipped for conventional spectrophotometric measurements. Concerning the light sources, Xe and halogen lamps are available as well as continuous (Ar+, He-Ne, laser diodes) and pulsed (Nd:YAG e Ti-sapphire) laser systems. Different monochromators and detectors for the UV-visible and NIR reigions, oscilloscopes (transient digitizers) etc. constitute the detecting part of the setup. The spectra can be measured at different temperatures thanks to closed cycle He cryostats operating between 10 and 300 K. Facilities for the sample preparation (polishing machine) and orientation (microscopes, etc.) are also present. The absorption spectra are usually measured in the 300-2200 nm range, whereas the emission and decay time measurements are limited to the 400-1200 nm range. When necessary also the IR and Raman spectra can be measured using facilities available in the Department.
-Analysis of the experimental data.
It is carried out on the basis of suitable theoretical models applied to the studied system. For example, in the case of crystals doped with rare earth ions the absorption spectra are analysed in the frame of the Judd-Ofelt scheme, that allows the determination of important parameters related to the radiative processes and the comparison of the efficiencies of different materials activated with the same ion. The low temperature absorption and emission spectra are used to compile the energy levels scheme of the optical centre, that can be reproduced with suitable Crystal Field calculations. Sometime it is possible to analyze the decay profiles of the excited states as a function of the temperature by means of models taking into account the coupling between the emitting ion and its surroundings, the possibility of energy transfer processes, and so on. In the case of crystals activated with transition metal ions it is often interesting to observe the behaviour of the components of absorption and emission bands as function of the polarization, related to the symmetry properties of the coordination polyhedron around the optically active ion. In this case the Ligand Field Theory allows to determine the selection rules accounting for the observed intensity and to reproduce the experimental energies by suitable calculations.

Completion accademic year: 2019/2020

Completion accademic year: 2018/2019

Completion accademic year: 2017/2018

Completion accademic year: 2016/2017

Completion accademic year: 2015/2016

Completion accademic year: 2014/2015

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