Study On Electrochemical Assembly Of Mesoporous Silica Loaded With Nanoscaled Zn_xCa_（1-x）TiO₃:yPr³⁺ Materials

The development of the mesoporous material lays the foundation of new subjectmaterial for the subject-object electrochemical assembly. Using the ordered pores, largepore surface area and thickness of mesoporous material, the research of mesoporousmaterials loaded with different luminescent materials has been widely developed.The composite luminescent material of ZSM-5loaded with ZCT:yPr3+wassuccessfully synthesized by CEPD, in which the ZCT:yPr3+sol as electrophoresissolution. Incipiently, the ZCT:yPr3+was prepared by sol-gel method with calcium nitrate,zinc nitrate and tetrabutyl titanate, while the optimal value of x, y was determined andluminescence properties were researched. And then, the effect of electrophoresis voltage,deposition time, the electrode prepared by different methods and the concentration ofactive ions Pr3+on the assembly was discussed. The results are as follows:Using the ZSM-5electrode prepared by gel casting method, the Zn0.2Ca0.8TiO3:0.002Pr3+sol as electrophoresis solution, when the voltage was10V and time remained1h,the assembly sample with better luminescence properties can be obtained, which wereanalyzed and tested through XRD, TEM and FL etc. The results reveal that Zn0.2Ca0.8-TiO3:0.002Pr3+was successfully entered into the pores of ZSM-5. Excitation spectrashows that excitation peak at203nm,314nm,375nm attributed to the excitation of the4f5d energy state of Pr3+ion and the band gap of Zn0.2Ca0.8TiO3host, Pr3+/Ti4+-Pr4+/Ti3+charge transfer state, respectively. while the weak excitation peak at408nm,480nm and499nm were due to the f-f transitions of Pr3+from3H4to3PJ(J=2,1,0), respectively.Emission spectra reveals a red light emission peak appeared at615nm derived from thecharacteristic emission of1D2-3H4of the Pr3+ion4f orbit. Compared with the pure long-lasting phosphor material, the excitation spectrum come about blue shift and deeper trapis obtained showing in the glow curves. Based on emitting characteristics of the assemblysample, its mathematical model of luminescence mechanism was established.