First Example of Nonlinear Optical Materials Based on Nanoconjugates of Sandwich Phthalocyanines with Quantum Dotsстатья
Статья опубликована в высокорейтинговом журнале
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Дата последнего поиска статьи во внешних источниках: 9 июня 2017 г.
Аннотация:We report original, selective, and efficient approaches
to novel nonlinear optical (NLO) materials, namely
homoleptic double- and triple-decker europium(III) complexes
2 and 3 with the A3B-type phthalocyanine ligand (2,3-
bis[2’-(2’’-hydroxyethoxy)ethoxy]-9,10,16,17,23,24-hexa-n-butoxyphthalocyanine
1) bearing two anchoring diethyleneglycol
chains terminated with OH groups. Their covalently
linked nanoconjugates with mercaptosuccinic acid-capped
ternary CdSeTe/CdTeS/ZnSeS quantum dots are prepared in
the presence of an ethyl(dimethylaminopropyl)carbodiimide
activating agent. Optical limiting (OL) properties of the obtained
low-symmetry complexes and their conjugates with
quantum dots (QDs) are measured for the first time by the
open-aperture Z-scan technique (532 nm laser and pulse
rate of 10 ns). For comparison, symmetrical double- and
triple-decker EuIII octa-n-butoxyphthalocyaninates 5 and 6
and their mixtures with trioctylphosphine oxide-capped QDs
are also synthesized and studied. It is revealed that both
lowering of molecular symmetry and expansion of the pelectron
system upon moving from double- to triple-decker
complexes significantly improves the OL characteristics,
making the low-symmetry triple-decker complex 3 the most
efficient optical limiter in the studied family of sandwich
complexes, affording 50% lowering of light transmittance
below 0.5 Jcm@2 input fluence. Conjugation (both covalent
and noncovalent) with QDs affords further enhancement of
the OL properties of both double- and triple-decker complexes.
Altogether, the obtained results contribute to the development
of novel nonlinear optical materials for future
nanoelectronic and optical device applications.