Optical properties of conjugated polymer-ZnSe nanocrystal nanocomposites |
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| Authors: | Yun Da-Qin Feng Wei Wu Hong-Cai Liu Xiao-Zeng and Qiang Jun-Feng |
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| Affiliation: | School of Electrical and Information Engineering, Xi'an Jiaotong University, Xi'an 710049, China; School of Materials Science and Engineering, Tianjin University, 300072, China and Tianjin Key; Laboratory of Composite and Functional Materials, Tianjin 300072, China |
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| Abstract: | Nanocomposites of
poly(2-methoxy,5-octoxy)1,4-phenylenevinylene]-zinc selenide
(MOPPV-ZnSe) are synthesized by mixing the polymerization of 1,4-bis
(chloromethyl)-2-methoxy-5-octoxy-benzene in the presence of ZnSe
quantum dots. The resulting MOPPV-ZnSe nanocomposites possess a
well-defined interfacial contact, thus significantly promoting the
dispersion of ZnSe within the MOPPV matrix and facilitating the
electronic interaction between these two components. Raman and
UV--visible absorption spectra are influenced by the incorporation
of ZnSe nanocrystals. High-resolution transmission electron
microscopic and tapping-mode atomic force microscopic results show
clearly the evidence for phase-segregated networks of ZnSe
nanocrystals, which provide a large area of interface for charge
separation to occur. Steady-state spectra of MOPPV-ZnSe
nanocomposites are markedly quenched by the introduction of intimate
polymer/ZnSe junctions. Time-resolved photoluminescence
measurements show that the lifetime decays quickly, which further
confirms the occurrence of charge transfer in MOPPV-ZnSe
nanocomposites. |
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| Keywords: | nanocomposites interface time-resolved photoluminescence spectrum excitons separation |
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