陷阱控制型应力发光材料Mg3Y2Ge3O12∶Tb3+制备及其发光性能OA

Compared with destructive mechanoluminescent(ML)materials,trap-controlled ML materials exhibit distinct advantages such as structural integrity and recoverable luminescence,showing great potential in stress visual-ization,anti-counterfeiting,and stress sensing.The development of high-performance trap-controlled ML materials is therefore of great significance for promoting the practical application of ML.In this work,a novel trap-controlled ML material Mg3Y2Ge3O12∶Tb3+was successfully synthesized.Its structure,luminescent properties,and recoverable ML mechanism were systematically investigated through X-ray diffraction,scanning electron microscopy,excitation and emission spectroscopy,afterglow decay curves,afterglow spectroscopy,thermoluminescence spectra,ML spec-troscopy,transient photon signal acquisition,and piezoresponse force microscopy.The results show that Mg3Y2Ge3O12∶Tb3+exhibits high consistency emission spectra under photoluminescence,afterglow,and ML modes.The intense green emission primarily originates from the Tb3+5D4→7F5 transition.Thermoluminescence analysis indi-cates that the presence of broadly distributed carrier traps within the material plays a critical role in achieving long-lasting afterglow and recoverable ML.Cyclic friction experiments demonstrate a good linear relationship between ML intensi-ty and applied mechanical pressure.Moreover,after luminescence decay,the ML intensity can be fully restored to its initial level through ultraviolet irradiation.Piezoresponse force microscopy measurements further confirm that me-chanically induced localized piezoelectric effects serve as the key excitation mechanism for the recoverable ML behav-ior.This work not only expands the material systems available for high-performance recoverable ML materials but also provides important experimental evidence for understanding their luminescence mechanisms and potential applications.