High-Sensitivity and High-Precision Near-Infrared Luminescence Thermometry Using Mn⁵⁺-Activated Sr₅(VO₄)₃Cl and...

Area of Science:

• Materials Science
• Solid-State Chemistry
• Biomedical Engineering

Background:

• Luminescence thermometry requires materials with temperature-dependent optical properties.
• Developing stable and sensitive thermometers for physiological conditions is crucial for biomedical applications.

Purpose of the Study:

• To synthesize and characterize novel near-infrared-emitting materials for luminescence thermometry.
• To evaluate the performance of Sr₅(V_0.97O₄)₃Cl:Mn_0.03 as a luminescence thermometer at physiological temperatures.

Main Methods:

• Synthesis and characterization using X-ray diffraction and solid-state NMR.
• Evaluation of luminescence properties and thermometric performance using single-parameter and multiparametric methods.
• Assessment of photoluminescence quantum yield and thermal stability.

Main Results:

• Sr₅(V_0.97O₄)₃Cl:Mn_0.03 exhibited high temperature relative sensitivity (3.14% K^-1) and resolution (0.042 K) at 308 K.
• Multiparametric thermometry improved accuracy while retaining precision.
• Parameter-free methods achieved high accuracy (0.03-0.08 K).
• The material demonstrated excellent brightness (47% PLQY) in the second biological window and good thermal stability.

Conclusions:

• Sr₅(V_0.97O₄)₃Cl:Mn_0.03 is a highly promising material for luminescence thermometry at physiological temperatures.
• Its performance, brightness, and stability make it suitable for biomedical applications.