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- W1990808434 abstract "This study highlights possible errors in luminescence lifetime measurements when using bright optical oxygen sensors with high excitation light intensities. An analysis of the sensor with a mathematical model shows that high light intensities will cause a depopulation of the ground state of the luminophore, which results in a non-linear behaviour of the luminescence emission light with respect to the excitation light. The effect of this non-linear behaviour on different lifetime determination methods, including phase-fluorometry, is investigated and in good agreement with the output of the model. Furthermore, the consequences of increasingly high light intensities on phase fluorometric lifetime measurements are illustrated for different oxygen sensors based on benzoporphyrin indicators. For the specific case of PdTPTBPF-based sensors an error as high as 50% is possible under high light conditions (0.25 mol m−2 s−1 ≈ 50 mW mm−2). A threshold of applied excitation light intensity is derived, thus enabling the point at which errors become significant to be estimated. Strategies to further avoid such errors are presented. The model also predicts a similar depopulation of the ground state of the quencher; however, the effect of this process was not seen in lab measurements. Possible explanations for this deviation are discussed." @default.
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- W1990808434 date "2014-09-22" @default.
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- W1990808434 title "The effect of high light intensities on luminescence lifetime based oxygen sensing" @default.
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- W1990808434 doi "https://doi.org/10.1039/c4an01058b" @default.
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