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Role of the Polymer Matrix on the Photoluminescence of Embedded CdSe Quantum Dots |
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| Authors: | Dr Gleb I Tselikov Prof Dr Victor Yu Timoshenko Prof Dr Leonid A Golovan Dr Jürgen Plenge Alina M Shatalova Georgiy A Shandryuk Irina Yu Kutergina Alexey S Merekalov Prof Dr Eckart Rühl Prof Dr Raisa V Talroze |
| Institution: | 1. Department of Physics, M. V. Lomonosov Moscow State University, 1–2 Leninskiye Gory, Moscow 119991 GSP‐1 (Russia);2. Institute of Chemistry and Biochemistry, Physical and Theoretical Chemistry, Freie Universit?t Berlin, Takustr. 3, Berlin 14195 (Germany);3. A. V.Topchiev Institute of Petrochemical Synthesis RAS, Leninskii prospekt 29, Moscow 119991 GSP‐1 (Russia) |
| 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 poly4‐(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. |
| Keywords: | cadmium selenide liquid‐crystal polymers nanocomposites photoluminescence quantum dots |