Preparation and Properties of a Novel Mechanoluminescent Material Ca5Ga6O14:Sm3+
A novel Ca5-xGa6O14:xSm3+mechanoluminescent(ML)material was successfully prepared by high-tem-perature solid-state reaction method.The crystal structure,surface morphology,photoluminescence,ML properties and luminescence mechanism of Ca5-xGa6O14:xSm3+were investigated via X-ray diffraction(XRD),scanning elec-tron microscopy(SEM),diffuse reflection spectra,photoluminescence excitation and emission spectra,lumines-cence decay,ML spectra and thermoluminescence spectra.Under the excitation of 404 nm,the emission peaks at 562,599,642,715 nm are detected in Ca5-xGa6O14:xSm3+,corresponding to 4G5/2→6Hj(j=5/2,7/2,9/2,11/2)characteristic emission of Sm3+.With the increase of Sm3+content,the luminescence intensity first increases and then decreases,the optimal luminescence intensity is obtained at x=0.07 and the decay time decreases from 1.92 ms to 1.30 ms.Under the sliding friction,ML emission band is obtained in Ca5-xGa6O14:x Sm3+,and the ML intensity in-creases linearly with applied stress,indicating that the material has potential application in the field of stress sensors.
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