Methods for Broadband Spectral Analysis: Intrinsic Fluorescence Temperature Sensing as an Example.

Area of Science:

• Materials Science
• Spectroscopy
• Solid-State Chemistry

Background:

• Temperature-dependent fluorescence is crucial for optical thermometry.
• Characterizing broadband fluorescence spectra requires robust methods.
• Existing techniques may have limitations in resolution and accuracy.

Purpose of the Study:

• To systematically study the temperature-dependent fluorescence of (Ba,Sr)2SiO4:Eu2+.
• To propose and compare novel techniques (barycenter and extended intensity ratio) for fluorescent temperature sensing.
• To evaluate the multifunctional temperature-sensing capabilities of the phosphor.

Main Methods:

• Systematic fluorescence spectroscopy under varying temperatures.
• Application and comparison of barycenter, extended intensity ratio, and traditional methods.
• Development of sensing functions based on emission band barycenter, bandwidth, and intensity ratios.

Main Results:

• The barycenter technique proved effective, overcoming spectrometer resolution limitations where peak location methods failed.
• Multiple sensing functions with nearly linear temperature dependence were obtained.
• The (Ba,Sr)2SiO4:Eu2+ phosphor demonstrated multifunctional temperature-sensing abilities.

Conclusions:

• The proposed barycenter and extended intensity ratio techniques are effective for characterizing broadband fluorescence spectra.
• The (Ba,Sr)2SiO4:Eu2+ phosphor exhibits excellent multifunctional temperature-sensing properties.
• These findings support applications in point thermometry and thermal mapping.