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Optimal parameters in variable-velocity scanning luminescence lifetime microscopy.

Zdeněk Petrášek1, Juan M Bolivar1, Bernd Nidetzky1,2

  • 1Institute of Biotechnology and Biochemical Engineering, Graz University of Technology, NAWI Graz, Graz, Austria.

Microscopy Research and Technique
|November 17, 2020
PubMed
Summary
This summary is machine-generated.

This study optimizes scanning velocities for microsecond luminescence lifetime measurements. The variable-velocity scanning method proves more robust against background noise than traditional gating techniques.

Keywords:
confocal laser scanning microscopyerror analysislifetime imagingluminescencephosphorescence

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Area of Science:

  • Optics and Photonics
  • Materials Science
  • Spectroscopy

Background:

  • Accurate luminescence lifetime measurement is crucial for material characterization.
  • Conventional gating schemes can be sensitive to background noise.
  • A novel scanning beam method offers potential for improved measurements.

Purpose of the Study:

  • To determine optimal scan velocities for microsecond luminescence lifetime measurements using a scanning excitation beam.
  • To evaluate the performance of the scanning method under different signal distributions (Poisson and normal) and background conditions.
  • To compare the scanning method's robustness against background noise with conventional gating techniques.

Main Methods:

  • Computational simulations were employed to analyze luminescence decay rates.
  • Standard deviation and bias were calculated for different scanning velocities and signal types.
  • The impact of uncorrected background signals on decay rate measurements was investigated.
  • Simulations included comparisons with two standard luminescence lifetime gating schemes.

Main Results:

  • Optimal scan velocities were identified for microsecond luminescence lifetime measurements.
  • The scanning method demonstrated robustness against both Poisson and normal signal distributions.
  • A weak background signal was found to introduce bias, which was accounted for in parameter selection.
  • The variable-velocity scanning method showed superior performance compared to gating schemes in the presence of background.

Conclusions:

  • The variable-velocity scanning method provides a robust approach for microsecond luminescence lifetime measurements.
  • This method is less susceptible to background signal interference than conventional gating techniques.
  • The findings offer guidance for optimizing experimental parameters in luminescence spectroscopy.