Surface-encapsulated europium-substituted heteropolyoxotungstates: Structural characterizations and photophysical properties

Article Abstract:

The synthesis and characterization of the surfactant-encapsulated europium-substituted heteropoly-oxotungstates, (DODA) 10H[Eu (H2O)(PE11) 39)2]. 17H2O (SEC-2), (DODA) 12H3[Eu (BW11O39) 2]. 13H2O (SEC-3), and (DODA) 9-[EuW10O36]. 9H2O (SEC-4) is presented. The surface chemical properties of POMs become hydrophobic by the displacement of their countercations such as NH4 (super +1), K (super +1) and Na (super +1) with the cationic surfactants.

Surface active agents, Surface Active Agent Manufacturing, Chemical synthesis

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A study of the effects of europium doping and calcination on the luminescence of titania phosphor materials

Article Abstract:

The effect on addition of europium in the formation of the different structures and the usefulness of the various polymorphs as phosphors is reported. The results indicated that the multiple sites observed for the europium in the calcined samples result from the europium doping into both the anatase and the brookite contaminant lattice, which is responsible for the luminescence in the metastable crystalline titania.

Luminescence

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Emission polarization of europium and terbium chelates

Article Abstract:

The anisotropy of Tb(super 3+) and Eu(super 3+) in various chelate complexes bound with or without a carbostyril antenna is examined and presented. Results suggest that it can be possible to construct a probe with Eu(super 3+) that retains its high anisotropy once the antenna is added to the chelate complex. Such probes could measure rotational motion on the millisecond time scale.

Analysis, Anisotropy, Atomic properties, Terbium

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