Dual-mode optical temperature sensing using Dy³⁺/Sm³⁺ co-activated Ba₂ZnSi₂O₇ phosphor with tuneable sensitivity

Area of Science:

• Materials Science
• Solid-State Chemistry
• Luminescence

Background:

• Optical thermometry offers non-contact temperature measurement.
• Developing novel phosphors with high sensitivity is crucial for advanced sensing.

Purpose of the Study:

• To synthesize and characterize a novel Ba₂ZnSi₂O₇:Dy³⁺, Sm³⁺ phosphor.
• To evaluate its potential for optical temperature sensing applications.

Main Methods:

• High-temperature solid-state reaction method for synthesis.
• X-ray diffraction (XRD), Photoluminescence (PL) spectroscopy, Diffuse Reflectance Spectroscopy (DRS), Scanning Electron Microscopy (SEM), and FTIR for characterization.
• Analysis of luminescence intensity ratio and lifetime for temperature sensing performance.

Main Results:

• Successful synthesis of Ba₂ZnSi₂O₇:Dy³⁺, Sm³⁺ with monoclinic structure.
• Optimal Sm³⁺ doping at 1 mol% with observed Dy³⁺ to Sm³⁺ energy transfer.
• Demonstrated temperature-dependent fluorescence intensity ratio (max sensitivity 7.19% K^-1) and lifetime (max sensitivity 1.10% K^-1).

Conclusions:

• The synthesized phosphor exhibits excellent temperature-dependent luminescence properties.
• This material shows significant potential for high-performance optical temperature sensing applications.