UV–Visible–NIR Ultrabroadband Mechanoluminesence from Sr₃Y₂Ge₃O₁₂:Bi³⁺ and Its Performance Regulation

The existing mechanoluminesence has a single band. The ³P₁→¹S₀ transition of Bi³⁺ ion can achieve an ultrabroadband emission in UV‒Visible. However, the existing Bi³⁺ ion activated mechanoluminesence materials only emit blue light. To solve this problem, the UV‒Visible‒NIR ultrabroadband mechanoluminesence is realized in a multi-lattice garnet compound matrix, and its mechanoluminesent performance is regulated by the neighbor ion (i.e., Sc³⁺ ion) substitution strategy. The luminescence source is determined by steady-state fluorescence spectroscopy (at 465 nm, corresponding to the ³P₁→¹S₀ transition of Bi³⁺ ion). The mechanism of mechanoluminesence is related to the persistent luminescence. The material defect distribution is obtained by thermoluminescence test, and the deep trap (>0.7 eV) contributes to the mechanoluminesence.