Preparation And Properties Of Novel Triboluminescent Materials

Triboluminescence(TL)is a special luminescence phenomenon in which an object emits light when subjected to an external force or break.Since the triboluminescent materials can visually display the external force acting on it in the form of light,this makes it has potential application value in many fields such as stress sensor,real-time stress distribution visualization and display imaging.Therefore,it has received more and more attention from researchers in recent years.Although the preparation materials of triboluminescent materials are mostly environmentally friendly and environmentally friendly materials,they are non-toxic,and their luminescence intensity and color can be regulated by different doping ions.The conventional preparation process has a simple operation of high temperature solid phase method,but the number of triboluminescent materials,luminescence properties and stability are far from meeting the practical standards.Since there is no clear theoretical explanation for the mechanism of triboluminescence,this has caused great limitations in the preparation and performance improvement of triboluminescent materials.These aspects have prompted us to develop new synthetic triboluminescent materials with good stability and excellent luminescence properties.This paper has studied and discussed the following three aspects:(1)Developed a new yellow triboluminescent material Na2CaSn2Ge3O12:Sm3+,Mn2+ with different Mn2+ doping concentration,and characterized it by XRD,fluorescence spectrum,afterglow spectrum,afterglow decay curve and pyrolysis spectroscopy.Fluorescence spectroscopy indicated that the highest emission peak of the sample was at 566 nm,which was mainly caused by the 4G5/2?6H5/2 transition of Sm3+and the transition of 4T1?6A1 of Mn2+,and with the increase of Mn2+ doping concentration,Sm3+The characteristic emission peaks at 566 nm,616 nm and 664 nm are all decreasing,but the emission peak at 566 nm starts to increase significantly when the Mn2+ doping concentration reaches 0.2%.The afterglow spectrum and afterglow attenuation spectrum of the sample are also the same as the emission spectrum.The peak shape and corresponding changes are obtained by the interaction of Sm3+ and Mn2+.The highest peak of the afterglow spectrum is located at 570 nm,which is a bright yellow afterglow.Pyrolysis spectroscopy indicated that there was a trap in the sample,and analysis of the trap showed that the depth of the trap was more suitable for triboluminescence,further demonstrating the possibility of the sample having triboluminescence.(2)The triboluminescent material BaZrSi3O9 with Eu2+ and Dy3+ co-doped was prepared by high temperature solid phase synthesis method,and characterized by XRD,excitation and emission spectroscopy,afterglow spectroscopy,afterglow decay curve and pyrolysis spectroscopy.Optical properties were studied.The peaks of the emission spectrum and the afterglow spectrum are shown at 478 nm,which corresponds to the 4f65d?4f7 characteristic transition of Eu2+,and the intensity corresponding to the emission spectrum increases first and then decreases with the increase of the doped Dy3+concentration.The afterglow spectrum and the afterglow decay curve both increase and then decrease with the increase of Dy3+doping concentration,and the afterglow reaches the maximum at Dy3+ concentration of 1%.When the excitation source is removed,the naked eye can observe that the sample has strong cyan afterglow.Pyrolysis spectroscopy indicates that the depth of the sample trap exactly meets the requirements of the triboluminescence trap.Through the above analysis of the luminescence properties of Eu2+and Dy3+ co-doped BaZrSi3O9,it can be roughly found that it should have the ability of triboluminescence.(3)Experimental tests were performed on the triboluminescent properties of the above two kinds of triboluminescent materials.By adding the above two kinds of triboluminescent materials powders in a mixed solution of an epoxy resin and a curing agent,a pellet sample which can be used for the triboluminescent property test is prepared by using a hard rod on the surface of the pellet and using Andorra Ixon Ultra The 888 CCD camera directly captures its triboluminescence image and applies a cyclic compression to the pellet using a mechanical testing machine,and its photoluminescence signal is used to test its illuminating performance.It is proved that both materials have triboluminescence ability,which has contributed to the development of triboluminescent materials.