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Design Of Functional Devices Based On Triboluminescence And Single Ion Multicolor Luminescence

Posted on:2020-04-28Degree:MasterType:Thesis
Country:ChinaCandidate:H XuFull Text:PDF
GTID:2381330596987237Subject:Materials Science and Engineering
Abstract/Summary:PDF Full Text Request
Luminescence has shown great application potential in lighting,display,imaging,sensing and other fields,and has attracted more and more researchers'attention in recent years.However,many articles focus on the mechanism research,and the application design which can solve the practical problems still needs to be supplemented urgently.In this paper,two kinds of luminescent materials are synthesized,based on their respective luminescent properties,after the characterization and analysis of their luminescent properties'optimization,two kinds of functional materials with different functions and different application fields are designed.One kind of self-warning solid lubrication material for friction and wear is prepared by using its triboluminescence properties,and the other is used to study the possibility of its application in anti-counterfeiting by using the adjustable photoluminescence color change of single doped ions.The main contents are as follows:1.The triboluminescence properties of the powders are optimized by adjusting the ion concentration of doped Eu2+,Dy3+.The crystal structure and surface morphology of the powder are analyzed by SEM and TEM.The experimental results show that when the doped Eu2+ion concentration reaches 2%and the Dy3+ion concentration reaches 1%,the photoluminescence and triboluminescence of the synthesized powder reach the highest intensity.The changes of trap depth and carrier density of SrAl2O4:Eu2+,Dy3+mechanical luminescent materials before and after stress are analyzed by means of thermoluminescence spectroscopy,and the mechanism of triboluminescence is discussed.The optimized triboluminescent powder is compounded with elastic matrix Epoxy,and SrAl2O4:Eu2+,Dy3+/Epoxy mechanical luminescent composites are further obtained.2.On the basis of the synthesis of SrAl2O4:Eu2+,Dy3+/Epoxy,two kinds of self-lubricating block material?SLBM?and self-lubricating coating material?SLC?with different functions/structures are prepared by compounding with lubricant graphite.The phase and structure of the samples are analyzed by SEM and TEM?including Mapping?,respectively.After that,the double-layer structure with SAOED/Epoxy-based SLBM and SAOED/Epoxy-based SLC as self-lubricating early warning layer and the early warning effect under actual working conditions are assembled,designed and confirmed respectively.The properties of triboluminescence and friction and wear parameters of the composite structure are further studied and optimized and the tribological changes caused by doped ions are explained.3.NaYGeO4:Pr3+photoluminescence powders are prepared by high temperature solid state method.The photoluminescence properties of doped Pr3+are optimized by adjusting the ion concentration,and the crystal structure and surface morphology are analyzed by XRD,SEM and TEM.The photoluminescence mechanism is studied and explained by photoluminescence spectra.After that,the pattern design is carried out on the 3D printed bottom plate with samples with different doping ratios.The results show that the luminescence has obvious color difference under different concentrations of doping,and the multicolor luminescence phenomenon of single ion doping can be applied to the research and development of new anti-counterfeiting devices.
Keywords/Search Tags:luminescence, functional materials, SrAl2O4, NaYGeO4
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