A1 Refereed original research article in a scientific journal

Hot electron-induced electrogenerated chemiluminescence of rare earth(III) chelates at oxide-covered aluminum electrodes




AuthorsKulmala S, Ala-Kleme T, Latva M, Loikas K, Takalo H

PublisherPLENUM PUBL CORP

Publication year1998

JournalJournal of Fluorescence

Journal name in sourceJOURNAL OF FLUORESCENCE

Journal acronymJ FLUORESC

Volume8

Issue1

First page 59

Last page65

Number of pages7

ISSN1053-0509

DOIhttps://doi.org/10.1007/BF02758238


Abstract
Aromatic Gd(III) and Y(III) chelates produce ligand-centered emissions during cathodic pulse polarization of oxide-covered aluminum electrodes, while the corresponding Tb(III) chelates produce metal-centered D-5(4) --> F-7(J) emissions. It was observed that a redox-inert paramagnetic heavy lanthanoid ion, Gd(III), seems to enhance strongly intersystem crossing in the excited ligand and direct the deexcitation toward a triplet-state emission, while a lighter diamagnetic Y(III) ion directs the photophysical processes toward a singlet-state emission of the ligand. The luminescence lifetime of Y(III) chelates was too short to be measured with our apparatus, but the luminescence lifetime of Gd(III) chelates was between 20 and 70 mu s. The mechanisms of the ECL processes are discussed in detail.



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