DIRECTOR DE PROIECT:      Dr. Tiseanu Carmen
PROJECT MANAGER:          Dr.  Tiseanu Carmen
Email: carmen.tiseanu@inflpr.ro

DURATA PROIECTULUI:         2006 - 2008
PROJECT DURATION :           2006 - 2008
CONDUCATOR PROIECT:      INSTITUTUL NATIONAL DE CERCETARE-DEZVOLTARE PENTRU FIZICA LASERILOR, PLASMEI SI RADIATIEI INFLPR DIN BUCURESTI

PARTENERI:                        1. UNIVERSITATEA DIN BUCURESTI (Prof. V.I. Parvulescu)
                                           2. UNIVERSITATEA BABES-BOLYAI DIN CLUJ-NAPOCA ( Prof. S. Simon)
                                           3. INSTITUTUL NATIONAL DE CERCETARE-DEZVOLTARE PENTRU FIZICA MATERIALELOR INCDFM DIN BUCURESTI ( Dr. A. Manea )

MAIN OBJECTIVES
• Nanocomposites (or hybrid organic-inorganic materials) with lanthanides (Ln³⁺) represent a hot topics research worldwide as they offer the possibility of fine tuning the optical response by controlling Ln³⁺- host interactions at a nanometric scale. While the coordination chemistry of lanthanide’s ions is well- known and several synthesis methods of Ln-nanocomposites are currently developed, many of the problems remained unsolved are related to the basic mechanisms of luminescence. The broad objective of the project is to investigate structure- photophysical properties in Ln³⁺-nanocomposites.   A great variety of structural investigation methods are considered: (FT-IR, XRD, NMR, ESR, XPS, luminescence spectroscopy). 

• The study of the optical properties is based on a comprehensive spectroscopic instrumentation and methods such as optical absorption, excitation spectroscopy, steady-state and time-resolved laser induced luminescence spectroscopy with temporal resolution from ps to ns. The expected results concern (1) synthesis of novel nanocomposites with Ln³⁺ with emission spanning a broad spectral domain, from UV/VIS to NIR and lifetimes varying form several µs to ms and and (2)  in-depth investigation and modeling of the  excited state dynamics of Ln³⁺ in nanocomposites as well as the  confinement effects induced by the nanocomposites structure on the luminescence  properties.  Applications to photonics, but also to sensing and environment are addressed.

RESULTS
Publications
6. C. Tiseanu, V. Lorenz- Fonfria, A. Gessner, M. Kumke, V.I. Parvulescu, "Photoluminescence study of terbium-exchanged USY zeolites: Number of species, luminescence decays and decay-associated spectra,” J. Appl. Phys. 104(1-9), 033530 (2008).
5. C. Tiseanu, V.I. Parvulescu, A. Geßner, M. Kumke,  J. Martens, “Europium (III) - an efficient luminescence probe for the Si to Al ratio and silylation effects in microporous-mesoporous Zeogrid materials,” J. Phys. Chem B. 112(34), 10552-10562 (2008).
4. C. Tiseanu, A. Geßner, M.U. Kumke, "Dehydration and rehydration effects on the photoluminescence properties of terbium-exchanged MFI type materials,” J. Non-Cryst. Solids 354 (18), 1969-1975 (2008).
3. C. Tiseanu, V. Lorenz- Fonfria, A. Gessner, M. Kumke, “Comparative study of terbium-exchanged zeolites functionalized with alkoxysilanes,” J. Mater. Sci. Electron. Vol 20, Supplement 1, 312-316 (2009).
2. C. Tiseanu, A. Gessner, M. Kumke, B. Gagea, V. Parvulescu, J. Martens, “Luminescence spectra and dynamics of lanthanides doped microporous- mesoporous materials,” J. Lumin. 128 (5-6), 751-753 (2008).
1. C. Tiseanu, B. Gagea, V.I. Parvulescu, V. Lorenz-Fonfria, A. Geßner, M.U. Kumke, "Investigation of the hydrophobization efficiency of terbium-exchanged BEA zeolites by means of FT-IR, TGA, physical adsorption and time-resolved photoluminescence,"  Langmuir 23 (12), 6781-6787 (2007).

Conferences
8. C. Tiseanu, V.I. Parvulescu, A. Gessner, M.U. Kumke, “Siliceous grafted Eu³⁺- and Tb³⁺ complexes: structural characterization and luminescence properties,” 15th International Conference on Luminescence and Optical Spectroscopy of Condensed Matter (ICL’08), Lyon, France, 7-11 July, 2008.
7. C. Tiseanu, A. Gessner, M. U. Kumke, “Time-resolved photoluminescence proprties of terbium- exchanged microporous-mesoporous materials,” 15th International Conference on Luminescence and Optical Spectroscopy of Condensed Matter (ICL’08), Lyon, France, 7-11 July, 2008.
6. C. Tiseanu, V.A. Lorenz-Fonfria, E. Cotoi,  “Species-related luminescence-structure relationships in Eu³⁺-exchanged microporous-mesoporous materials,“ 2nd International Conference on Advanced Nano Materials (ANM 2008), Aveiro, Portugal, June 22-25, 2008.
5. C. Tiseanu, V.I. Parvulescu, C. Paun, S. Dobre, A. Gessner, M.U. Kumke, E. Cotoi, “Luminescence properties of Eu³⁺, Tb³⁺ and Nd³⁺ doped ionic liquids immobilized on mesoporous silica supports,” 2nd International Conference on Advanced Nano Materials (ANM 2008), Aveiro, Portugal, June 22-25, 2008.
4. C. Tiseanu, A. Gessner, M.U. Kumke, B. Gagea, V.I. Parvulescu, J. Martens, "Luminescence spectra and dynamics of lanthanides doped microporous- mesoporous materials," 16th International Conference on Dynamical Processes in Excited States of Solids, Segovia, Spain, June, 17-22, 2007.
3. C. Tiseanu, V.A. Lorenz-Fonfria, A. Gessner, M.U. Kumke, “Comparative study of terbium-exchanged zeolites functionalized with alkoxysilanes,” the International Conference on Optical, Optoelectronic and Photonic Materials and Applications, London, England, 30 July - 03 August 2007.
2. A. Gessner, M.U. Kumke and C. Tiseanu, "Luminescence properties of lanthanide’s doped MFI-type materials,” the Bunsen Conference, Graz, Austria, 17-19 May, 2007.
1. A. Gessner, M.U. Kumke and C. Tiseanu, “Luminescence properties of lanthanide’s doped MFI-type materials,” ICP2007 - XXIII International Conference on Photochemistry, Cologne, Germany, 29 July - 3 August  2007.