Temperature and stress dual-function visual sensing based on Y3GaO6:Tb3+/Eu3+ multicolor mechanoluminescent material

To address the issue of single sensing function in current Mechanoluminescence (ML) material, a ML material Y 3 GaO 6 : Eu 3+ /Tb 3+ with temperature and stress dual-function sensing characteristics was prepared by high-temperature solid-state method. The crystal phase, afterglow and luminescence properties of the materials were studied by a series of characterization techniques. Optical studies reveal that color-tunable emission from red to yellow and green can be achieved by adjusting the doping concentrations of Eu 3+ and Tb 3+ . Benefiting from the intrinsic differences in the temperature responses of Tb 3+ and Eu 3+ ions, a ratiometric temperature-sensing model based on the intensity ratio of their characteristic emission peaks was established. Meanwhile, the material exhibits ML under both friction and tensile stimuli, with the intensity showing a linear relationship with the applied stress. By analyzing the luminescence response law under temperature and stress conditions, this study realizes two functions of temperature sensing and stress sensing, which provides a new strategy for the design of advanced mechanical luminescent materials and shows broad application prospects in the fields of structural health monitoring and intelligent bionic skin.