Factors influencing stimulated emission from poly(p-phenylenevinylene)

被引：115

作者：

Denton, GJ

Tessler, N

Harrison, NT

Friend, RH

机构：

[1] Cavendish Laboratory, Cambridge, CB3 OHE, Madingley Road

来源：

PHYSICAL REVIEW LETTERS | 1997年 / 78卷 / 04期

关键词：

D O I：

10.1103/PhysRevLett.78.733

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

We report measurements of stimulated emission (SE) in films of poly(p-phenylenevinylene) (PPV). SE is observed in the region of the dw photoluminescence, using 3.8 eV excitation, and 25% gain was obtained when a PPV film was incorporated into a microcavity structure. We show that photo-oxidation greatly reduces the SE. We demonstrate that singlet polaron excitons form a high proportion of the initially photoexcited states in pristine PPV, and consider that at the excitation density used here (3 x 10(19) cm(-3)) the fast decay of the SE is largely due to exciton-exciton annihilation.

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页码：733 / 736

页数：4

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