Luminescent Thermochromic Silver Iodides as Wavelength-Dependent Thermometers

Area of Science:

• Materials Science
• Inorganic Chemistry
• Solid-State Chemistry

Background:

• Luminescent thermochromic materials are crucial for temperature sensing applications.
• Designing and synthesizing such materials with significant emission shifts presents a considerable challenge.

Purpose of the Study:

• To synthesize novel luminescent thermochromic silver iodides.
• To investigate their structural properties and thermochromic behavior.
• To evaluate their potential as luminescent thermometers.

Main Methods:

• Solvothermal synthesis of two new silver iodide compounds: (emIm)Ag3I4 (1) and (emIm)Ag2I3 (2).
• Structural characterization of the anionic layers and chains.
• Analysis of luminescent thermochromism and emission shifts with temperature.

Main Results:

• Successful synthesis of (emIm)Ag3I4 (1) with a [Ag3I4]- anionic layer and (emIm)Ag2I3 (2) with an infinite [Ag2I3]- chain structure.
• Both compounds exhibit distinct luminescent thermochromism with significant emission wavelength shifts.
• These represent rare examples of layered or chain silver iodides displaying luminescent thermochromism.

Conclusions:

• The synthesized silver iodides demonstrate promising luminescent thermochromic properties.
• Compounds 1 and 2 are identified as potential candidates for wavelength-dependent luminescent thermometry.
• This work contributes to the development of novel materials for advanced temperature sensing.