Temperature-dependent photoluminescence from MEH-PPV and MEH-OPPV containing oxadiazole in the main chain |
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| Authors: | F Kong XL Wu GS Huang RK Yuan CZ Yang PK Chu GG Siu |
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| Institution: | (1) National Laboratory of Solid State Microstructures and Department of Physics, Nanjing University, Nanjing, 210093, P.R. China;(2) College of Chemistry and Chemical Engineering, Nanjing University, Nanjing, 210093, P.R. China;(3) Department of Physics and Materials Science, City University of Hong Kong, Kowloon, Hong Kong, P.R. China |
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| Abstract: | We report the temperature-dependent photoluminescence (PL) behavior of two poly (p-phenylene-vinylene) derivatives with different backbones, a homopolymer poly-2-methoxy-5-(2′-ethyl-hexyloxy)-1,4-phenylene-vinylene] (MEH-PPV) and a copolymer poly-{2-methoxy-5-(2-ethylhexyloxy)-1,4-phenylene-vinylene]-alt-2,5-diphenylene-1,3,4-oxadiazole-vinylene]} (MEH-OPPV). The PL peak positions of the MEH-PPV in both solid solution and film are blue shifted with increasing measurement temperature because the thermally induced torsion and libration modes reduce the conjugation lengths of the polymer, but the shift rate is smaller in the MEH-PPV film than that in the solid solution. The PL peak position of the MEH-OPPV film is independent of measurement temperature because there is a large dihedral angle between the adjacent monomer units. The large dihedral angle increases the conformational disorder to eliminate the effect of the disorder induced by the thermally induced torsion and libration modes on the conjugation lengths of the MEH-OPPV. PACS 73.61.Ph; 78.55.Kz |
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