Universität zu Köln

Hertel, Tobias, Himmelein, Sabine, Ackermann, Thomas, Stich, Dominik ORCID: 0000-0002-7166-8759 and Crochet, Jared ORCID: 0000-0002-9570-2173 (2010). Diffusion Limited Photoluminescence Quantum Yields in 1-D Semiconductors: Single-Wall Carbon Nanotubes. ACS Nano, 4 (12). S. 7161 - 7169. WASHINGTON: AMER CHEMICAL SOC. ISSN 1936-0851

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Abstract

Photoluminescence quantum yields and nonradiative decay of the excitonic S-1, state in length fractionated (6,5) single-wall carbon nanotubes (SWNTs) are studied by continuous wave and time-resolved fluorescence spectroscopy. The experimental data are modeled by diffusion limited contact quenching of excitons at stationary quenching sites including tube ends. A combined analysis of the time-resolved photoluminescence decay and the length dependence of photoluminescence quantum yields (PL QYs) from SWNTs in sodium cholate suspensions allows to determine the exciton diffusion coefficient D = 10.7 +/- 0.4 cm(2)s(-1) and lifetime T-pL for long tubes of 20 +/- 1 ps. PL quantum yields Phi(pL) are found to scale with the inverse diffusion coefficient and the square of the mean quenching site distance, here I-d = 120 +/- 25 nm. The results suggest that low PL QYs of SWNTs are due to the combination of high-diffusive exciton mobility with the presence of only a few quenching sites.

Item Type:	Journal Article
Creators:	Creators Email ORCID ORCID Put Code Hertel, Tobias UNSPECIFIED UNSPECIFIED UNSPECIFIED Himmelein, Sabine UNSPECIFIED UNSPECIFIED UNSPECIFIED Ackermann, Thomas UNSPECIFIED UNSPECIFIED UNSPECIFIED Stich, Dominik UNSPECIFIED orcid.org/0000-0002-7166-8759 UNSPECIFIED Crochet, Jared UNSPECIFIED orcid.org/0000-0002-9570-2173 UNSPECIFIED
URN:	urn:nbn:de:hbz:38-491010
DOI:	10.1021/nn101612b
Journal or Publication Title:	ACS Nano
Volume:	4
Number:	12
Page Range:	S. 7161 - 7169
Date:	2010
Publisher:	AMER CHEMICAL SOC
Place of Publication:	WASHINGTON
ISSN:	1936-0851
Language:	English
Faculty:	Unspecified
Divisions:	Unspecified
Subjects:	no entry
Uncontrolled Keywords:	Keywords Language FLUORESCENCE CORRELATION SPECTROSCOPY; EXCITON DIFFUSION; DESORPTION; EFFICIENCY; GRAPHITE; SOLVENTS; KINETICS; BUNDLES; OXYGEN Multiple languages Chemistry, Multidisciplinary; Chemistry, Physical; Nanoscience & Nanotechnology; Materials Science, Multidisciplinary Multiple languages
URI:	http://kups.ub.uni-koeln.de/id/eprint/49101