Luminescence quenching mechanism for microheterogeneous systems
- Creators
- Carraway, E. R.
- Demas, J. N.
- DeGraff, B. A.
Abstract
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.
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.Additional details
- Eprint ID
- 80020
- Resolver ID
- CaltechAUTHORS:20170809-113359289
- CHE 86-00012
- NSF
- CHE 88-17809
- NSF
- Created
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2017-08-09Created from EPrint's datestamp field
- Updated
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2021-11-15Created from EPrint's last_modified field