Dr. Carmen TISEANU Senior Researcher National Institute for Laser, Plasma and Radiation Physics Laboratory of Solid-State Quantum Electronics PO Box MG-36, Magurele, 077125 Romania Phone:       +(40) (21) 457-4550 ext. 2127 Fax:           +(40) (21) 457-4243 Email:        carmen.tiseanu@inflpr.ro Web page:  http://nanolumin.inflpr.ro Since 01 August 2017 with:      X-Ray Microtomography Laboratory      http://tomography.inflpr.ro/

Research interests Dr. Carmen Tiseanu collaborative and interdisciplinary research focuses on the luminescence properties of rare earth (lanthanide) doped  nano-hybrids. Along with her collaborators, Prof. Dr. V. I. Parvulescu (University of Bucharest) and Prof. habil. M.U. Kumke (Potsdam University, Germany) she investigates a broad range of sol-gel derived materials containing lathanides, or their complexes with organic ligands and ionic liquids with the aim of establishing structure-luminescence relationships as studied by time-resolved luminescence spectroscopy. Main topics: Photoluminescence properties of organic/inorganic nanohybrid materials Photoluminescence spectra and decays of lanthanide-doped - ionic liquids - organically modified silicates - micro and mesoporous materials - quantum dots - coordination complexes Complex deconvolution methods for the analysis of time-resolved photoluminescence spectra.

Research

● Photoluminescence properties of lanthanides in ionic liquids. Radiative versus non-radiative relaxation processes in lanthanide’s doped ionic liquids immobilized on silica supports. 
● Complex spectral deconvolution methods applied to the analysis of the excited state-dynamics of lanthanide’s: Quantified Maximum Entropy, aria-normalized time-resolved luminescence spectra (TRANES), lifetimes distribution, decay associated spectra. Description of species-related luminescence-structure relationships by use of the time-resolved luminescence spectra of Eu³⁺.
● Lanthanide’s ions in microporous and mesoporous materials: the effects of hydrophobization via silylation on the photoluminescence properties of lanthanides exchanged zeolites or double hierarchical mesoporous materials; the effects of the Si to Al ratio on the Ln³⁺ photoluminescence properties ; the role of the various organic ligands in the luminescence sensitization of Eu³⁺ and Tb³⁺ as well as surface modification of silica and MCM-41.
● Luminescence properties of quantum dots doped with lanthanide’s ions: the role of the capping ligand and the nanocrystal as sensitizer (antenna effects) or /and inhibitor for the non-radiative process induced via vibrational coupling with water solvent molecules.

● Optical spectroscopy of lanthanide’s doped active laser media: energy levels, energy transfer and quenching processes, program codes for the calculation of the crystal-field energy levels, irreducible representations and wave functions of lanthanides with f² and f¹² type configuration;  sensitivity analysis for the crystal-field parameters of  Tm³⁺ in a series of isostructural garnet laser crystals.