Role of the polymer matrix on the photoluminescence of embedded CdSe quantum dots

Chemphyschem : a European Journal of Chemical Physics and Physical Chemistry
Gleb I TselikovRaisa V Talroze

Abstract

The photoluminescence (PL) of CdSe quantum dots (QDs) that form stable nanocomposites with polymer liquid crystals (LCs) as smectic C hydrogen-bonded homopolymers from a family of poly[4-(n-acryloyloxyalkyloxy)benzoic acids] is reported. The matrix that results from the combination of these units with methoxyphenyl benzoate and cholesterol-containing units has a cholesteric structure. The exciton PL band of QDs in the smectic matrix is redshifted with respect to QDs in solution, whereas a blueshift is observed with the cholesteric matrix. The PL lifetimes and quantum yield in cholesteric nanocomposites are higher than those in smectic ones. This is interpreted in terms of a higher order of the smectic matrix in comparison to the cholesteric one. CdSe QDs in the ordered smectic matrix demonstrate a splitting of the exciton PL band and an enhancement of the photoinduced differential transmission. These results reveal the effects of the structure of polymer LC matrices on the optical properties of embedded QDs, which offer new possibilities for photonic applications of QD-LC polymer nanocomposites.

References

May 16, 2002·Journal of the American Chemical Society·Habib SkaffTodd Emrick
Sep 21, 2002·Chemical Communications : Chem Comm·A N Shipway, I Willner
Dec 1, 2004·Langmuir : the ACS Journal of Surfaces and Colloids·Evgenii B BarmatovMarina V Barmatova
Mar 23, 2006·Journal of the American Chemical Society·Qingling ZhangThomas P Russell
Sep 14, 2011·Langmuir : the ACS Journal of Surfaces and Colloids·Alexander A EzhovRaisa V Talroze
Jan 1, 2010·Nano Reviews·Vanessa Wood, Vladimir Bulović
Sep 19, 2007·Soft Matter·Alexander BökerThomas P Russell

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