Page 56 - PR 2014 2016 10 Materials and Nanotechnology

332 Materials and Nanotechnology | Progress Report

for biological applications of nanoplasmonic optical quality and moderate processing
as flow cytometry, immunoassays, cell im- conditions. By incorporating luminescent
3+
aging and bioassays where it can improve Ln -complexes within the polymer matrix,
fluorescence signatures (Figure. 66) the resulting product represents not only
the sum of individual contributions of both
organic and inorganic phases, but also novel
properties for a new class of materials.

Work has been developed with bases on
the complexes diaquatris(thenoyltrifluoro-
acetonate)-europium(III), [Eu(tta) (H O) ],
3 2 2
ditriphenylphosphine oxide(thenoyltrifluo-
roacetonate)-europium(III), [Eu(tta) (TPPO) ],
3 2
Figure 66. Plasmonic effect in some materials produced in IPEN. triaquatris(acetyl-acetonate)Terbium(III),
[Tb(acac) (H O) ] and triphenylphos-
3 2 3
phine oxide (acetyl-acetonate)Terbium(III),

.Materials For Security And [Tb(acac) (TPPO) ], [Tb(acac) (n-picNO) ],
2
3
3
2
[Eu(tta) (n-picNO) ], (n=2,3,4) complexes were
3 2
Solar Cell Storage: co-doped into polymers in order to obtain
multicolor light-emitting devices controlling
concentration and excitation energy lines.
Luminescence - tuneable multicolor These materials are of great interest due to
PMMA films doped with lanthanide their strong luminescence and relatively sim-
β-diketonate complexes for lighting ple and no expensive preparation (Figure. 67).

Interest in luminescent materials containing
trivalent lanthanide ions (Ln ) as emitting
3+
centers has grown significantly in recent
3+
years. However, the Ln -complexes generally
present low thermal stability, limited pho-
tostability and poor mechanical properties.
Another parallel challenge is that most of
these compounds are usually achieved as
hydrates, consequently the luminescence
intensity is suppressed due to the activa -
tion of non-radiative channels. In order to
overcome simultaneously these deficien-
cies and improve the characteristics of light
emission (e.g. quantum yield, lifetimes),
Ln -complexes have been incorporated into
3+
organic polymers, liquid crystals and sol-gel
derived organic-inorganic hybrids. Polymers
offer several advantages for the development
of materials, such as flexibility, versatility,

Instituto de Pesquisas Energéticas e Nucleares