Enhancing upconversion luminescence via intermediate state in double perovskite phosphor: three-mode optical thermometry with python-assisted validation

High luminescence intensity, multiple modes, and high sensitivity are critical to achieving high measurement accuracy for optical thermometry in microelectronic devices and biological systems. The double perovskite phosphor, Ca2Sc0.63Mg0.07SbO6:Yb3+,Er3+, proves...