Study On Spectral Regulation And Application Based On Single-doped And Co-doped Luminescence

With the rapid development of science and technology in twenty-first Century,luminescence,as an important field of materials,has developed rapidly and been widely used in various conditions such as identification,anti-counterfeiting,information storage,color decoration etc.Moreover,the properties of materials must meet various demands of application.Despite the pursuing of high-performance materials,materials demand of extra applications should also be faced.The request of different and systematic materials is increasingly emerging,as the perspective of material field.Ion-doped luminescence,which can irradiate light under excitation,possess excellent properties,such as the easy preparation process,the performance stability,the high-quality performance and the reusability.The luminescent bands are determined by the central ions or co-doping ions.In addition,adjusting substrates and doped ions can be used to prepare luminescence of various performance.Which is one of the important methods for preparing luminescent materials.Firstly,in this report,photoluminescent material Zn3Ga2Ge2O10:m%Cr3+(m=0.5,1,2,5)was designed and fabricated,which was doped with Cr3+.Cr3+is suitable for doping because of its unique electronic structure.By adjusting the doping ratio,the luminescence properties were characterized,and the effects of different doping concentration of Cr3+on emission wavelength and emission intensity were explored to obtain the best performance.The relationship between the lattice structure and emission spectra is explored according to the different radius of the lattice.According to the characteristics of materials,the patterned functional applications are designed and fabricated.The fluorescence color of the material was compared according to the CIE 1931 color position which was analyzed corresponding to the emission spectrum of the samples.Cr3+single-doped luminescence possessed favorable persistent luminescence(PersL)properties.According to the similarity of emission color and the differences of PersL properties different doping concentrations of Cr3+-doped luminescence,the time-dependent patterns were fabricated.The patterns were capable of dynamically changing with time,and could produce a dynamic change that approximates the flower blooming to withering process.The time-dependent patterns had the characteristics that the patterns were reusable and the excited resource were convenient.Great application prospects could be expected in the fields of information storage,patterned identification,and anti-counterfeiting.Then,co-doping is adapted to control the spectral properties of luminescence.On consider of introducing co-doped ions to enhance the luminescent properties,co-doped ions were introduced to prepare Zn3Ga2Ge2O10:1%Cr3+,n%Yb3+(n=0.5,1,2,5),Zn3Ga2Ge2O10:1%Cr3+,n%Eu3+(n=0.5,1,2,5),CaAl2O4:0.5Cr3+,pYb3+(p=0.5,1,5),and CaAl2O4:0.5Yb3+,pCr3+(p=0.5,1,5).The luminescence properties and the effects of co-doped ions were systematically studied.The PersL properties of Zn3Ga2Ge2O10:1%Cr3+,n%Yb3+(n=0.5,1,2,5),and Zn3Ga2Ge2O10:1%Cr3+,n%Eu3+(n=0.5,1,2,5)had been significantly improved compared to Zn3Ga2Ge2O10:m%Cr3+(m=0.5,1,2,5).In addition,by changing the ratio of co-doped ions,the PersL properties could be adjusted,and a Taiji time-dependent pattern and an"Eclipse" time-dependent pattern based on co-doped luminescence materials were fabricated.CaAl2O4:0.5Cr3+,pYb3+(p=0.5,1,5),and CaAl2O4:0.5Yb3+,pCr3+(p=0.5,1,5)had the characteristics of dual-band emission in the visible and infrared bands.By adjusting the doping ratio of co-doped ions,the materials possessed the characteristics of infrared emission but no emission in visible band,which could act more secretive.s an information recording and marking material for special condition.Using the infrared emission characteristics based on CaAl2O4 co-doped luminescence,the infrared fluorescent patterns were reusable,and the excited resource were convenient.The pattern could be used for information concealing,and anti-counterfeiting applications.It was a kind of recording and identifying material that could meet the demand of special environment.