Journal of Physical Chemistry & Biophysics
Open Access
ISSN: 2161-0398
+44 1478 350008
ISSN: 2161-0398
+44 1478 350008
Paula Gawryszewska, Ewa Kasprzycka, Yen Pham, Victor A. Trush, Vladimir M. Amirkhanov,Lucjan Jerzykiewicz, Jerzy Sokolnicki, Albano N.Carneiro, Oscar L. Malta, Janina Legendziewicz
University of Wroclaw, Poland Muenster University of Applied Sciences, Germany Saigon University, Vietnam National Taras Shevchenko University of Kyiv, Ukraine Universidade Federal de Pernambuco, Brazil
Scientific Tracks Abstracts: J Phys Chem Biophys
Lanthanide chelates are of great interest due to their excellent photophysical properties and as such they find many uses as electroluminescent devices for organic light emitting diodes as luminescent markers and probes, in biological sensing and imaging. Due to the low value of the molar absorption coefficients of 4f-4f transitions of Lanthanides (Ln), a strongly sensitized Ln photoluminescence is achieved by excitation of a chelating chromophore to its singlet state followed by efficient energy transfer from the absorber to the metal ion excited state (the so-called antenna effect). Luminescence of these ions is characterized by large Richardson shift, narrow emission bands and long luminescence decay time, which makes them ideal for biological application and enables the use of timeresolved detection. Due to the apparent Richardson shift and quite different characteristics between excitation and emission, this type of compounds has been referred to as Light Converting Molecular Devices (LCMDs). Designing new compounds with functional optical properties, two types of Ln chelates with N-phosphorylated sulfonamides (SAPh) and N-phosphorylated carboxamides (CAPh) were obtained and investigated. The latter show very high emission quantum yield (Q_Ln^L) of 92% for Eu3+ compound and 74% for Tb3+ compound. Importance of the structural characteristics for the efficient ligand-to-metal energy transfer in Ln chelates (Ln3+ = Eu3+, Tb3+, Sm3+, Dy3+, Yb3+), and efficient metal-centered luminescence is shown and intramolecular energy transfer processes in these new classes of Ln compounds are discussed. Due to very high Q_Ln^L, the Eu3+ and Tb3+ complexes with CAPh were incorporated into poly(methyl methacrylate) (PMMA). These materials display bright luminescence with the interesting perspective of application in photonic. Furthermore, PMMA thin films containing Eu3+, Tb3+, Sm3+ and Dy3+ complexes with CAPh in various ratios may be useful for multicolor barcoding.
Paula Gawryszewska is D.Sc. Eng. at the Faculty of Chemistry, University of Wroclaw. She received her M. Sc. in Wroclaw University of Science and Technology. In 1998 she received PhD in Faculty of Chemistry at the University of WrocÃ?Â?aw in the group of prof. Janina Legendziewicz. Then she spent 6 months (1998/1999) at Michigan Technological University (MTU) in the group of prof. James Riehl, where she dealt with polarized luminescence of racemic mixtures of lanthanide complexes. She visited USA twice more on short stays in 1999 and 2014 in MTU and University of Minnesota Duluth (prof. J. Riehl). Her scientific interests include coordination chemistry, luminescent materials, energy transfer in lanthanide compounds, plasmonenhanced fluorescence.