Luminescent Thermometer Based on a Praseodymium(iii) Cyanide-Based Metal-Organic Framework

Area of Science:

• Materials Science
• Inorganic Chemistry
• Nanotechnology

Background:

• Lanthanide ions are key for temperature sensing.
• Pr³⁺-based thermometers are understudied, especially in the NIR region.
• Developing novel materials for precise thermometry is crucial.

Purpose of the Study:

• To synthesize and characterize a novel Pr³⁺-based coordination polymer for luminescent thermometry.
• To investigate its performance in the near-infrared (NIR) spectral region.
• To evaluate its temperature-dependent luminescence and sensitivity.

Main Methods:

• Synthesis of the coordination polymer {[Pr₂^IIIPt₃^II(CN)₁₂(4,4'-bpyO₂)₄(H₂O)₆]·4H₂O}_n.
• Characterization using various spectroscopic techniques.
• Temperature-dependent luminescence measurements from 12 K to 386 K.

Main Results:

• The coordination polymer exhibits efficient energy transfer, leading to visible and NIR luminescence.
• Distinct temperature-dependent luminescence was observed over a wide temperature range (12-386 K).
• High relative thermal sensitivity (≅1%·K^-1) and low temperature uncertainty (0.2 K) were achieved.

Conclusions:

• The novel Pr³⁺-based coordination polymer is a promising material for NIR luminescent thermometry.
• This work expands the application of Pr³⁺ in advanced temperature sensing.
• The material demonstrates excellent performance for precise and remote temperature measurements.