THE EFFICIENCY AND TIME-DEPENDENCE OF LUMINESCENCE FROM POLY(P-PHENYLENE VINYLENE) AND DERIVATIVES

被引:142
作者
SAMUEL, IDW
CRYSTALL, B
RUMBLES, G
BURN, PL
HOLMES, AB
FRIEND, RH
机构
[1] UNIV CAMBRIDGE,CAVENDISH LAB,CAMBRIDGE CB3 0HE,ENGLAND
[2] UNIV LONDON IMPERIAL COLL SCI TECHNOL & MED,DEPT CHEM,LONDON SW7 2AY,ENGLAND
[3] UNIV CAMBRIDGE,CHEM LAB,CAMBRIDGE CB2 1EW,ENGLAND
关键词
D O I
10.1016/0009-2614(93)89144-7
中图分类号
O64 [物理化学(理论化学)、化学物理学];
学科分类号
070304 ; 081704 ;
摘要
We report measurements of the quantum efficiency and time decay of photoluminescence in the conjugated polymers poly(p-phenylenevinylene) (PPV) and poly(2-methoxy, 5-(2'ethyl-hexyloxy)-p-phenylenevinylene) (MEH-PPV). MEH-PPV is soluble and we measure values for the quantum yield for luminescence of order 35% for dilute solutions in toluene and chloroform. By comparison of luminescence decay rates in solution and in solid films we estimate luminescence efficiencies in solid films, which can be as high as 50% in partially conjugated PPV. Decay time distribution analysis of the luminescence reveals a broad distribution of decay rates, and this is consistent with the distribution of conjugation lengths known to be present in these materials. Exciton migration in better conjugated material results in narrower distributions of emitting chromophores.
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页码:472 / 478
页数:7
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