Spectroscopy and Photophysics of Self-Organized Zinc Porphyrin Nanolayers. 2. Transport Properties of Singlet Excitation | Zendy

H. Donker | Zendy; Arie van Hoek | Zendy; Willem van Schaik | Zendy; Rob B. M. Koehorst | Zendy; Mikalai M. Yatskou | Zendy; T.J. Schaafsma | Zendy

Open Access

Spectroscopy and Photophysics of Self-Organized Zinc Porphyrin Nanolayers. 2. Transport Properties of Singlet Excitation

Author(s) -

H. Donker,

Arie van Hoek,

Willem van Schaik,

Rob B. M. Koehorst,

Mikalai M. Yatskou,

T.J. Schaafsma

Publication year - 2005

Publication title -

the journal of physical chemistry b

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 0.864

H-Index - 392

eISSN - 1520-6106

pISSN - 1520-5207

DOI - 10.1021/jp058055g

Subject(s) - exciton , spectroscopy , time resolved spectroscopy , fluorescence , quenching (fluorescence) , materials science , fluorescence spectroscopy , porphyrin , emission spectrum , photochemistry , diffusion , singlet state , analytical chemistry (journal) , chemistry , spectral line , atomic physics , excited state , condensed matter physics , optics , physics , quantum mechanics , astronomy , chromatography , thermodynamics

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).

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