6533b82bfe1ef96bd128cee6
RESEARCH PRODUCT
Photoluminescence study of terbium-exchanged ultrastable Y zeolites: Number of species, photoluminescence decays and decay-associated spectra
Víctor A. Lórenz-fonfríaCarmen TiseanuAndre GessnerVasile I. ParvulescuMichael U. Kumkesubject
LanthanidePhotoluminescenceSilylationAnalytical chemistryFísicaGeneral Physics and Astronomychemistry.chemical_elementTerbiumQuímica analíticaCiència dels materialsSpectral linechemistryNon-linear least squaresInstitut für ChemieTime-resolved spectroscopySpectroscopydescription
Terbium-exchanged ultrastable Y (USY) zeolites were investigated by using time-resolved photoluminescence spectroscopy techniques and methods. To determine the distribution of terbium species in USY zeolites together with their photoluminescence properties, several analysis methods for the time-resolved luminescence spectra were used such as the area normalization of time-resolved photoluminescence spectra, singular value decomposition, global nonlinear least squares, and the maximum entropy. Except for a questionable long lifetime, small contribution of a terbium species with lifetime of 1.9¿2.1 ms, all the experimental and analysis results converged to a two terbium species distribution with lifetimes varying between 410¿440 and 1000¿1100 μ s . The effects of the silylation of terbium-exchanged USY zeolites with phenyl-, vinyl-, and hexadecyltrimethoxysilanes on the lanthanide¿s photoluminescence properties were also described.
| year | journal | country | edition | language |
|---|---|---|---|---|
| 2008-08-01 |