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Luminescence quenching mechanism for microheterogeneous systems

Carraway, E. R. and Demas, J. N. and DeGraff, B. A. (1991) Luminescence quenching mechanism for microheterogeneous systems. Analytical Chemistry, 63 (4). pp. 332-336. ISSN 0003-2700. doi:10.1021/ac00004a006.

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Determining quenching mechanisms for luminescent species adsorbed or bound to a variety of heterogeneous systems (e.g., silicas, organic, inorganic, and biopolymers) is quite difficult In the absence of detailed information on system heterogeneity. A method for assessing the relative contributions of static and dynamic quenching in heterogeneous systems is presented. While the method does not provide direct information on the details of system heterogeneity, it requires no a priori information on the nature of the heterogeneity. This approach is based on a comparison of intensity quenching data with lifetime quenching data using a preexponential weighted lifetime, τ_m. τ_m is calculated by fitting the observed decay curves to a sum of a relatively small number (2-4) of exponentials. For time-correlated single-photon counting the parameters obtained from a statistically acceptable fit can be used to accurately estimate τ_m, even though the computed model may bear no resemblance to the true decay kinetics. Simulations confirm that the method works for a wide range of heterogeneous systems. The technique is applied to oxygen quenching of a luminescent metal complex on a silica surface.

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Additional Information:© 1991 American Chemical Society Received for review August 3, 1990. Accepted November 1, 1990. We gratefully acknowledge the support of the National Science Foundation (Grants CHE 86-00012 and 88-17809). We thank S. W. Snyder for providing the deconvolution program and the reviewers for helpful suggestions.
Funding AgencyGrant Number
NSFCHE 86-00012
NSFCHE 88-17809
Issue or Number:4
Record Number:CaltechAUTHORS:20170809-113359289
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Official Citation:Luminescence quenching mechanism for microheterogeneous systems E. R. Carraway, J. N. Demas, and B. A. DeGraff Analytical Chemistry 1991 63 (4), 332-336 DOI: 10.1021/ac00004a006
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:80020
Deposited By: Tony Diaz
Deposited On:09 Aug 2017 18:42
Last Modified:15 Nov 2021 17:52

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