Effect Of High Dielectric Substrate Perovskite Structure On The Luminescent Properties Of Rare Earth

This paper uses high temperature solid state sintering prepares a good crystalline BaTiO3,modified it by doping Eu, obtained the luminescent powder with certain optical properties. Todetermine the optimal content of Eu by contrast experiment, uses fluorescence spectrometertest emission spectra and excitation spectra of the powder. In the five groups experimental data,the content of Eu are0.2%,0.4%,0.6%,0.8%and1.0%respectively. The outcome reveals thatwith the increase of the content of Eu, the luminous intensity increased, reached the maximumwhen the content is0.8%, and decreased when over0.8%. This is because the content of rareearth must be few, if it exceeds a certain concentration there will be concentration quenching,and reduces the luminous intensity. In this experiment, the optimum content of Eu is0.8%.The maximum emission peaks of five groups of the powder are located in695nm, the highestexcitation peaks are at352nm.ZrO+2is introducted to BaTiO3:Eu3to get BaTi31-xZrxO3:Eu+. In experiment, the contentof ZrO2are0,10%,20%,30%and40%. Uses fluorescence spectrometer test emission spectraand excitation spectra of the powder, found that with the increase of the content of ZrO2, theluminous intensity reduced. The intensity of BaTiO3+3:Eu3+is highest, BaTi0.6Zr0.4O3:Euislowest. The maximum emission peaks of five groups of the powder are located in702nm, thehighest excitation peaks are at351nm.The BaTi1-xZrxO3:Eu3+powder are pressed and sintered into ceramics, silvers and testsdielectric constant of them. Found that with the increase of the content of ZrO2, the dielectricconstant reduced. The dielectric constant of BaTiO33:Eu+is highest, reaches1710,BaTi30.6Zr0.4O3:Eu+is lowest, only973.Compared the change of the luminescence intensity and the change of the dielectricconstant of BaTi3+1-xZrxO3:Eu, found that the luminescent properties of the powder varies withthe dielectric constant of the corresponding ceramics.