FIELD-INDUCED EXCITON BREAKING IN CONJUGATED POLYMERS

被引：78

作者：

ARKHIPOV, VI

BASSLER, H

DEUSSEN, M

GOBEL, EO

KERSTING, R

KURZ, H

LEMMER, U

MAHRT, RF

机构：

[1] UNIV MARBURG,ZENTRUM MAT WISSENSCH,D-35032 MARBURG,GERMANY

[2] RHEIN WESTFAL TH AACHEN,INST HALBLEITERTECH 2,D-52074 AACHEN,GERMANY

来源：

PHYSICAL REVIEW B | 1995年 / 52卷 / 07期

关键词：

D O I：

10.1103/PhysRevB.52.4932

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

We have investigated the held-induced quenching of photoluminescence in a film of poly(p-phenylphenylenevinylene) (PPPV) blended with polycarbonate (PC). Upon applying a dc field less than or equal to 3 X 10(6) V cm(-1) a reduction of the luminescence yield up to 30% is observed. Time-resolved photoluminescence measurements using the fs-upconversion technique show that the quenching effect evolves on a time scale 0.5 to similar to 100 ps after excitation. We explain this ultrafast temporal behavior of the quenching process in terms of a field-assisted dissociation of neutral singlet excitations into geminate electron-hole pairs while undergoing a random walk among polymer segments. Our model implies that photocarrier generation is a secondary process resulting from exciton dissociation.

引用

页码：4932 / 4940

页数：9

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