Comparison of Time and Frequency Domain Methods for Luminescence Lifetime Measurements

Title
Comparison of Time and Frequency Domain Methods for Luminescence Lifetime Measurements
Publication Date
2008
Author(s)
McGraw, Christina
Khalil, Gamal
Callis, James
Type of document
Journal Article
Language
en
Entity Type
Publication
Publisher
American Chemical Society
Place of publication
United States of America
DOI
10.1021/jp711867u
UNE publication id
une:16113
Abstract
Despite the widespread use of luminescence lifetimes in physical measurements, there seems to be no consensus on the best method for lifetime determination. Researchers in this field split into two camps: those who favor methods that proceed from time-domain data and those who favor methods that proceed from frequency-domain data. System theory provides unique insight into the strengths and limitations of these methods of lifetime determination. First, system theory shows that the impulse response experiment and the frequency sweep experiment can both uniquely specify a shift-invariant linear system. Further, the time and frequency data sets are related by the Fourier transform. A careful comparison of these two methods was carried out with both numerical simulations and experiments using the same sample, light source, and detector. These comparisons were not limited to impulse and sine wave excitation; chirp, square wave, and random excitation sequences were evaluated as well. The results indicate that for the same total excitation energies time-domain sequences with a substantial dark period have the lowest uncertainty in the lifetime parameter estimates.
Link
Citation
The Journal of Physical Chemistry C, 112(21), p. 8079-8084
ISSN
1932-7455
1932-7447
Start page
8079
End page
8084

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