Limit of accuracy for fluorescence lifetime temperature sensing

Area of Science:

• Physical Chemistry
• Materials Science

Background:

• Temperature sensing is crucial in various scientific and industrial applications.
• Fluorescence lifetime (FL) offers a non-contact thermometry approach.
• Understanding the limitations of FL thermometry at elevated temperatures is essential.

Purpose of the Study:

• To evaluate the accuracy and limitations of the fluorescence lifetime (FL) temperature-sensing method.
• To determine the temperature range where FL thermometry is reliable.
• To investigate the influence of temperature on non-radiative relaxation rates.

Main Methods:

• Experimental determination of fluorescence lifetime at varying temperatures.
• Analysis of temperature-dependent changes in fluorescence decay.
• Correlation of FL measurements with non-radiative relaxation processes.

Main Results:

• The FL temperature-sensing method demonstrates high accuracy at temperatures below 400 K.
• The accuracy of the FL method significantly decreases at temperatures above 400 K.
• Non-radiative relaxation rates were observed to increase with rising temperature, impacting FL measurements.

Conclusions:

• The FL temperature-sensing method is suitable for low-temperature applications (< 400 K).
• The method's accuracy is compromised at higher temperatures due to increased non-radiative relaxation.
• Further research is needed to adapt FL thermometry for high-temperature environments.