Efficient exciton quenching by hole polarons in the conjugated polymer MEH-PPV

被引：34

作者：

Yu, J

Song, NW

McNeill, JD

Barbara, PF ^{[1
]}

机构：

[1] Univ Texas, Dept Chem & Biochem, Austin, TX 78712 USA

[2] Univ Texas, Ctr Nano & Mol Sci & Technol, Austin, TX 78712 USA

来源：

ISRAEL JOURNAL OF CHEMISTRY | 2004年 / 44卷 / 1-3期

关键词：

D O I：

10.1560/PHGE-RR3P-5P7V-DGCM

中图分类号：

O6 [化学];

学科分类号：

0703 ;

摘要：

Recently published near field scanning optical measurements (NSOM) on the conjugated polymer MEH-PPV exhibited a strong dependence of the photoluminescence intensity on the applied electric fields at the NSOM tip. The observed effect is apparently due to exciton quenching by hole polarons. In the present paper, a model "single carrier" electro-modulated-photoluminescence device is used to further explore the exciton quenching effect of hole polarons in MEH-PPV. Hole polarons, created by charge injection from an ITO electrode, are observed to dramatically quench the photoluminescence intensity of MEH-PPV. The Stern-Volmer quenching efficiency of a hole polaron in conjugated polymer thin films was measured to be 390 nm(3). This value, and other data presented herein, are consistent with the published NSOM photoluminescence modulation measurements and offer further evidence that hole polarons are efficient photoluminescence quenchers in MEH-PPV.

引用

页码：127 / 132

页数：6

共 28 条

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