Blue shift in the luminescence spectra of MEH-PPV films containing ZnO nanoparticles |
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| Authors: | Cuong Ton-That Matthew R Phillips |
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| Institution: | a Department of Physics and Advanced Materials, University of Technology Sydney, P.O. Box 123, Broadway, NSW 2007, Australia
b Institut des Matériaux Jean Rouxel, University of Nantes, 44322 Nantes Cedes 03, France |
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| Abstract: | Luminescence properties of nanocomposites consisting of ZnO nanoparticles in a conjugated polymer, poly 2-methoxy-5-(2′-ethyl hexyloxy)-phenylene vinylene] (MEH-PPV), were investigated. Photoluminescence measurements reveal a blue shift in the emission spectrum of MEH-PPV upon incorporation of ZnO nanoparticles into the polymer film while the emission is increasingly quenched with increasing ZnO concentration. In contrast, the structure of the polymer and its conjugation length are not affected by the presence of ZnO nanoparticles (up to 16 wt% ZnO) as revealed by Raman spectroscopy. The blue shift and photoluminescence quenching are explained by the separation of photogenerated electron-hole pairs at the MEH-PPV/ZnO interface and the charging of the nanoparticles. |
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| Keywords: | 72 80 Tm 78 30 Jw 78 67 Bf |
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