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Temperature-dependent photoluminescence from MEH-PPV and MEH-OPPV containing oxadiazole in the main chain

被引：24
作者：
Kong, F.
Wu, X. L. [1 ]
Huang, G. S.
Yuan, R. K.
Yang, C. Z.
Chu, P. K.
Siu, G. G.
机构：
[1] Nanjing Univ, Natl Lab Solid State Microstruct, Nanjing 210093, Peoples R China
[2] Nanjing Univ, Dept Phys, Nanjing 210093, Peoples R China
[3] Nanjing Univ, Coll Chem & Chem Engn, Nanjing 210093, Peoples R China
[4] City Univ Hong Kong, Dept Phys & Mat Sci, Kowloon, Hong Kong, Peoples R China
来源：
APPLIED PHYSICS A-MATERIALS SCIENCE & PROCESSING | 2006年 / 84卷 / 1-2期
关键词：
D O I：
10.1007/s00339-006-3601-5
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
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.
引用
收藏
页码：203 / 206
页数：4
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