Tm³⁺/Yb³⁺:BaMoO₄ phosphor for high-performance thermometry operating in the first biological window

Area of Science:

• Materials Science
• Optical Thermometry
• Biomedical Optics

Background:

• Optical thermometers are crucial for biological and medical applications.
• The first biological window (650-1000 nm) is ideal for in vivo optical measurements.
• Developing high-performance luminescent thermometers is an active research area.

Purpose of the Study:

• To develop a new luminescent thermometer operating within the first biological window.
• To investigate the thermometric properties of Tm3+/Yb3+:BaMoO4 phosphor.
• To provide guidance for designing high-performance ratiometric luminescent thermometers.

Main Methods:

• Utilized Tm3+/Yb3+:BaMoO4 phosphor.
• Employed 980 nm excitation.
• Measured the intensity ratio between G41-F43 (652 nm) and F2,33-H63 (691 nm) transitions.
• Evaluated temperature sensitivity and resolution across a range of 298-498 K.

Main Results:

• The developed thermometer is independent of excitation power, reducing measurement errors.
• Achieved high absolute sensitivity ranging from 210.5×10^-4 to 1034.5×10^-4 K^-1.
• Demonstrated maximal relative sensitivity of 1.36% K^-1 and temperature resolution of 0.37 K.

Conclusions:

• Tm3+/Yb3+:BaMoO4 phosphor is a promising material for optical thermometry in the biological window.
• The developed ratiometric luminescent thermometer exhibits excellent performance metrics.
• The findings offer valuable insights for selecting emission bands for advanced thermometric devices.