Spectroscopy and photophysics of self-organized zinc porphyrin nanolayers. 2. Transport properties of singlet excitation

被引：17

作者：

Donker, H ^{[1
]}

van Hoek, A ^{[1
]}

van Schaik, W ^{[1
]}

Koehorst, RBM ^{[1
]}

Yatskou, MM ^{[1
]}

Schaafsma, TJ ^{[1
]}

机构：

[1] Univ Wageningen & Res Ctr, Biophys Lab, Dept Agrotechnol & Food Sci, NL-6703 HA Wageningen, Netherlands

来源：

JOURNAL OF PHYSICAL CHEMISTRY B | 2005年 / 109卷 / 36期

关键词：

D O I：

10.1021/jp058055g

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：

Exciton diffusion has been studied in 5-25-nm-thick films of zinc tetra-(p-octylphenyl)-porphyrin (ZnTOPP) spin-coated onto quartz slides by intentional doping with quenchers using steady-state as well as time-resolved fluorescence spectroscopy. The fluorescence spectra of the films are very similar to those of solutions, indicating emission from localized exciton states. From the dependence of the fluorescence quenching on the quencher concentration and fluorescence lifetime measurements, the exciton diffusion can be concluded to be quasi-one-dimensional with an exciton diffusion length of 9 +/- 3 nm and an intrastack energy-transfer rate constant of 10(11)-10(12) s(-1). From fluorescence anisotropy decay measurements, we conclude that neighboring stacks aggregate in a herringbone structure, forming ordered domains that are randomly oriented in the substrate plane. These measurements indicate an interstack energy-transfer rate constant of (7 +/- 2) x 10(10) s(-1).

引用

页码：17038 / 17046

页数：9

共 59 条

[21] REDOX POLYMER CONTACTS TO MOLECULAR SEMICONDUCTOR-FILMS - TOWARD KINETIC CONTROL OF INTERFACIAL EXCITON DISSOCIATION AND ELECTRON-TRANSFER PROCESSES [J].