Determining the Exciton Diffusion Length in a Polyfluorene from Ultrafast Fluorescence Measurements of Polymer/Fullerene Blend Films

被引：51

作者：

Bruno, A. ^{[1
,2
]}

Reynolds, L. X. ^{[1
,2
,4
]}

Dyer-Snaith, C. ^{[1
,2
,3
,4
]}

Nelson, J. ^{[2
,3
,4
]}

Haque, S. A. ^{[1
,2
]}

机构：

[1] Univ London Imperial Coll Sci Technol & Med, Dept Chem, London SW7 2AZ, England

[2] Univ London Imperial Coll Sci Technol & Med, Ctr Plast Elect, London SW7 2AZ, England

[3] Univ London Imperial Coll Sci Technol & Med, Dept Phys, London SW7 2AZ, England

[4] Univ London Imperial Coll Sci Technol & Med, Grantham Inst Climate Change, London SW7 2AZ, England

来源：

JOURNAL OF PHYSICAL CHEMISTRY C | 2013年 / 117卷 / 39期

基金：

英国工程与自然科学研究理事会;

关键词：

CHARGE SEPARATION EFFICIENCY; MORPHOLOGY; MICROSTRUCTURE; DEPENDENCE; TRANSPORT;

D O I：

10.1021/jp404985q

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：

Emission quenching is studied in systems composed of [9,9-dioctylfluorene-co-N-(4-butylPhenyl)-diphenylamine] (TFB) and various concentrations of three different types of acceptors: [6,6]-phenyl-C61 butyric acid methyl ester (mono-PCBM) and its multiadduct analogues bis-PCBM and tris-PCBM. We find that the degree of emission quenching for a given fullerene concentration decreases as the PCBM adduct number increases, while the microstructure, as observed with transmission electron microscopy, becomes more coarse. These observations are rationalized in terms of possible differences in the miscibility of fullerenes in the polymer and different excitation dissociation rates. We also extract a value for the exciton diffusion length in TFB of 9.0 +/- 2 nm from ultrafast fluorescence decay measurements. The results have been confirmed with independent measurements.

引用

页码：19832 / 19838

页数：7

共 30 条

[1] Charge separation and fullerene triplet formation in blend films of polyfluorene polymers with [6,6]-phenyl C61 butyric acid methyl ester [J].