Mechanoluminescence properties and mechanism study of the red phosphor Y3GaO6:Eu3+

A novel mechanoluminescent (ML) material, Y 3 GaO 6 :Eu 3+ , which exhibits red ML emission under mechanical stimulation, is reported in this paper. The crystal structure belongs to the orthorhombic crystal system with the space group Cmc2 1 . Photoluminescence (PL) results indicate an optimum emission wavelength of 612 nm under 253 nm excitation, with an optimal Eu 3+ doping concentration of 0.09. The luminescence intensity of the sample, when subjected to both frictional and tensile stimuli, shows a linear dependence on the magnitude of the applied stress within the tested range. ML and thermoluminescence (TL) results suggest that the ML originates from electron release from traps. Furthermore, X-ray photoelectron spectroscopy (XPS) confirmed oxygen vacancies as the primary traps, with their concentration trend closely matching the ML intensity trend. In conclusion, this study demonstrates the potential application of Y 3 GaO 6 :Eu 3+ in stress distribution visualization, highlighting its broad prospects in the field of intelligent stress sensing.