Multimodal Non-Contact Luminescence Thermometry with Cr-Doped Oxides

Area of Science:

• Materials Science
• Solid State Physics
• Spectroscopy

Background:

• Non-contact temperature monitoring is crucial for various applications.
• Luminescence-based methods offer advantages but require improved sensor materials and multimodal capabilities.
• Chromium-doped oxides are promising candidates for advanced temperature sensing.

Purpose of the Study:

• To review luminescence characteristics of Cr-doped oxides for non-contact temperature measurements (5-300 K).
• To investigate multimodal sensing capabilities using luminescence intensity ratio, wavelength shift, and decay time.
• To identify promising materials for cryogenic temperature sensing.

Main Methods:

• Systematic study of temperature-induced luminescence changes in Cr3+-doped Al2O3, Ga2O3, Y3Al5O12, and YAlO3.
• Analysis of luminescence parameters including emission line intensity ratio, wavelength shift, and scintillation decay time.
• Application of relevant models to understand temperature-dependent luminescence mechanisms.

Main Results:

• Thermally-induced processes affecting Cr3+ excited state populations require low activation energy, leading to temperature-dependent luminescence.
• Gallium Oxide:Chromium (Ga2O3-Cr) demonstrated significant potential for non-contact measurements at cryogenic temperatures.
• Temperature resolution better than ±1 K achieved using luminescence intensity ratio (40-140 K) and decay time (80-300 K).

Conclusions:

• Cr-doped oxides are suitable for multimodal non-contact temperature sensing.
• Ga2O3-Cr exhibits excellent performance for cryogenic applications.
• Multimodal sensing strategies enhance temperature resolution and range.