TY  - JOUR
A1  - Kumke, Michael Uwe
A1  - Eidner, Sascha
A1  - Krüger, Tobias
T1  - Fluorescence quenching and luminescence sensitization in complexes of Tb3+ and Eu3+ with humic substances
N2  - Intrinsic fluorescence quenching of humic substances (HS) and the sensitization of Ln(3+) luminescence (Ln3+ Tb3+, Eu3+) in HS complexes were investigated. Both measurements yielded complementary information on the complexation of metals by HS. Large differences between fulvic acids(FA)and humic acids (HA) were found. From time-resolved luminescence measurements it is concluded that a combination of energy transfer and energy back transfer between HS and Ln(3+) is responsible for the observed luminescence decay characteristics. In the case of Eu3+, an additional participation of charge-transfer states is suggested. A new concept for the evaluation of the sensitized luminescence decays of Ln(3+) was adapted
Y1  - 2005
UR  - https://publishup.uni-potsdam.de/frontdoor/index/index/docId/13444
ER  -