Non-stoichiometric defect-controlled reduction toward mixed-valence Mn-doped hexaaluminates and their optical applications

The valence manipulation of emissive Mn ions (Mn²⁺/Mn⁴⁺) in Ba_0.75Al₁₁O_17.25–BaMgAl₁₀O₁₇ solid solutions and their corresponding application in temperature-sensing have been demonstrated by defect control along with composition variation.