Quantum mechanics

Metallurgy

Materials science

Chromatography

Atomic physics

Electric field

Excitation

Titanium

Wavelength

Laser

Physics

Organic chemistry

Optics

Computational chemistry

Stark effect

Analytical Chemistry (journal)

Crystallography

Chemistry

Optoelectronics

Ytterbium

Crucible (geodemography)

Journal of the American Ceramic Society

A conventional high temperature solid state method was utilized to prepare CaO‐Y 2 O 3 , which is a potential candidate for manufacturing crucible material to melt titanium and titanium alloys with low cost. Meanwhile, Yb 3+ ions and Er 3+ ions were selected as the sensitizers and activators respectively to dope into CaO‐Y 2 O 3 , aimed at providing real‐time optical thermometry during the preparation process of titanium alloys realized using fluorescence intensity ratio (FIR) technology. The results reveal that a high measurement precision can be acquired by using the Stark sublevels of Er 3+ 4 F 9/2 to measure the temperature with a maximum absolute error of only about 3 K. In addition, by analyzing the dependence of 4 I 13/2 → 4 I 15/2 transition on pump power of 980 nm excitation wavelength, it was found that the laser‐induced thermal effect has almost no influence on the temperature measurement conducted by using the FIR of the Stark sublevels of Er 3+ 4 I 13/2 , which means that a high excitation pump power can be used to obtain strong NIR emission and good signal‐to‐noise ratio for optical thermometry without the influence of the laser‐induced thermal effect. All the results reveal that CaO‐Y 2 O 3 : Yb 3+ /Er 3+ is an excellent temperature sensing material with high measurement precision.

Multifunctional optical thermometry based on the stark sublevels of Er3+ in CaO‐Y2O3: Yb3+/Er3+