Simultaneous enhancement of emission and thermal sensitivity via phase transition in Gd₂(MoO₄)₃:Yb³⁺/Er³⁺ crystals

Abstract The effects of site symmetric distortion induced by the phase transition on up‐conversion emission and thermal sensing performance Gd 2 (MoO 4 ) 3 :Yb 3+ /Er (GMO) crystals were elaborately studied minimizing interference from many factors. Monoclinic GMO showed a much stronger fluorescence intensity larger ratio under irradiation 980 nm laser in comparison to orthorhombic counterpart. These remarkable properties stemmed low symmetry with large monoclinic GMO. Moreover, property samples was assessed based technique, where exhibited higher maximum absolute sensitivity ( S = 0.0257 K −1 at 510 K) due distortion, which further explained Judd–Ofelt theory polarizability chemical bond volume model. Results opened an efficient avenue for achieving highly sensitive thermometry daily scenarios via finely tailoring local symmetry.