Four-Mode High-Performance Optical Thermometer in Eu³⁺ Monodoped MgNb₂O₆ Phosphor and Multifunctional Applications

Area of Science:

• Materials Science
• Optical Physics
• Solid State Chemistry

Background:

• Noncontact optical temperature measurement is vital across many fields.
• Existing optical thermometric materials lack sufficient sensitivity.
• Developing highly sensitive materials is an ongoing challenge.

Purpose of the Study:

• To develop an ultrasensitive optical temperature sensing system.
• To utilize a charge transfer band-based approach in MgNb2O6:Eu3+ phosphor.
• To overcome limitations of traditional thermometry methods.

Main Methods:

• Utilized luminescence intensity ratio based on excitation and emission spectra.
• Employed the shift of charge transfer band peak position as a measurement parameter.
• Prepared ink and PDMS flexible films of MgNb2O6:Eu3+ phosphor.

Main Results:

• Achieved a maximum relative sensitivity of 4.24% K-1 and absolute sensitivity of 2.99% K-1.
• Developed a novel optical thermometer with a sensitivity of 0.064 nm·T-1.
• Demonstrated high brightness and high-purity red emission suitable for LED applications.

Conclusions:

• MgNb2O6:Eu3+ phosphor offers superior performance compared to existing optical thermometers.
• The material shows promise for multimodal, high-performance, and multifunctional optical thermometry.
• Potential applications include LED technology, anticounterfeiting, and encryption.