Fluorescence lifetime measurements with simple correction for instrument temporal response in the advanced undergraduate laboratory
| العنوان: | Fluorescence lifetime measurements with simple correction for instrument temporal response in the advanced undergraduate laboratory |
|---|---|
| المؤلفون: | Seong J. Park, Eduardo Gonzalez, David M. Laman |
| المصدر: | American Journal of Physics. 88:1012-1018 |
| بيانات النشر: | American Association of Physics Teachers (AAPT), 2020. |
| سنة النشر: | 2020 |
| مصطلحات موضوعية: | Physics, Microsecond, Silicon photomultiplier, Optics, business.industry, Excited state, General Physics and Astronomy, Response time, Nanosecond, Oscilloscope, business, Luminescence, Photon counting |
| الوصف: | Observation of time-dependent luminescence from excited states with a wide range of lifetimes allows students to explore the connection between selection rules and transition rates. It is fairly simple to measure microsecond and longer lifetimes with equipment common to undergraduate programs, because the instrument response time of even modest bandwidth systems is insignificant on microsecond and longer time scales. The measurement of nanosecond lifetimes, however, is more challenging, because the instrument response time is comparable to the lifetimes being measured. In this case, the instrument temporal response must be deconvolved from the observed luminescence signals in order to extract the actual excited state lifetime. We describe a method for measuring nanosecond fluorescence lifetimes in the advanced undergraduate laboratory that uses real-time analog luminescence signals instead of traditional photon counting techniques. The detection electronics of this method are fairly simple, consisting of an oscilloscope monitoring the time-dependent output of an inexpensive silicon photomultiplier. We introduce a simple and transparent method for students to characterize the instrument response and deconvolve it from the observed luminescence signals, yielding measured nanosecond fluorescence lifetimes in good agreement with the corresponding literature values obtained by time-correlated single photon counting. The limitations of silicon photomultipliers for this method of measuring nanosecond lifetimes are discussed in detail. Application of this treatment to decay processes that are not single exponential is also discussed. |
| تدمد: | 1943-2909 0002-9505 |
| الوصول الحر: | https://explore.openaire.eu/search/publication?articleId=doi_________::1cd27a9935af25e79d3b645380612d1bTest https://doi.org/10.1119/10.0001752Test |
| رقم الانضمام: | edsair.doi...........1cd27a9935af25e79d3b645380612d1b |
| قاعدة البيانات: | OpenAIRE |
| تدمد: | 19432909 00029505 |
|---|