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Time resolved spectroscopy and gain studies of Fullerenes C60 and C70.

Spectrochimica acta. Part A, Molecular and biomolecular spectroscopy (2013-06-12)
Darakhshan Qaiser, Mohd Shahid Khan, R D Singh, Zahid H Khan
ABSTRACT

The fluorescence decay time of Fullerenes C60 and C70 in pure form as well as in mixture with Coumarin C440 and Quinizarine dyes are studied. Results indicate that the decay of pure fullerenes is constant throughout the solute concentration and it is also independent of excitation wavelength, whereas in the case of mixture with dyes different behavior is noticed. We have also calculated the Stern-Volmer quenching constant and optical gain of both the fullerenes from which it is found that the optical gain is positive for Fullerene C70 only in a very narrow range of concentration.

MATERIALS
Product Number
Brand
Product Description

Sigma-Aldrich
Coumarin, ≥98%
Supelco
Coumarin, certified reference material, TraceCERT®
Coumarin, primary reference standard
Sigma-Aldrich
Coumarin, ≥99% (HPLC)
Sigma-Aldrich
Fullerene-C60, sublimed, 99.9%
Sigma-Aldrich
[5,6]-Fullerene-C70, sublimed, ≥99% (HPLC)
Sigma-Aldrich
Fullerene-C60, 99.5%
Sigma-Aldrich
[5,6]-Fullerene-C70, 98%
Sigma-Aldrich
Fullerene-C60, 98%