Sol-gel Synthesis And Properties Study Of Europium Doped Titanate System Red Phosphor

With the unique characteristic of luminescence, rare-earth ions plays an irreplaceable role in the various application fields of luminescence materials. As The luminescence materials with Eu3+ as activator have become the source of red phosphors, and the luminescence property of Eu3+ is close to the kinds, crystal phase and property of the matching matrix materials, the study of the luminescence property of Eu3+ in different matrix material have received common attention. Titanate, a new and luminescence matrix material, have stable physical and chemical property. In this paper, zinc titanate, magnesium titanate, sodium lanthanum titanate, yttrium sodium titanate are chosen as matrix materials, the Eu3+ doped with Zn Ti O3 and Zn2 Ti O4, Eu3+ and Gd3+ co-doped with Mg Ti O3,Eu3+ doped with Na2La2Ti3O10, Eu3+ doped with Na YTi O4 red phosphor are prepared by the sol-gel method. XRD, DTA-TGA, IR are used to characterize the structure of the samples, and through the fluorescence spectrum and chromatic coordinates its luminescent properties are studied.With the sol-gel method, the Eu3+ doped with Zn Ti O3 and Zn2 Ti O4 matrix materials are prepared. The results show that a cubic phase sample Zn Ti O3 are formed when the annealing temperature is increased to 500℃. When the annealing temperature is increased as high as 700℃, tetragonal phase Zn2 Ti O4 is appeared. Through the excitation and emission spectra of the Eu3+ doped Zn Ti O3 and Zn2 Ti O4 luminescent material, we find that under 465 nm blue light excitation is the highest excitation peak of the samples. The emission spectra shows that red phosphor is corresponds to the 5D0â†'7F2 transitions on Eu3+. By calculating the chromatic coordinate value of Eu3+ doped with Zn Ti O3 and Zn2 Ti O4, it shows that the chromatic coordinate value of Eu3+ doped with Zn Ti O3 is(0.6233,0.3762) which is very close to the NTSC standard value(0.670,0.330). It is expected to be a new type of red-emitting material applicable to the blue LED chips.With the sol-gel method, red phosphor Mg Ti O3 is prepared, co-doping of Eu3+ and Gd3+. Then it is researched the Gd3+ an element of the red phosphor Mg Ti O3 impact on luminescence property of Eu3+in Mg Ti O3:Eu3+ system. The luminescence intensity of Eu3+in Mg Ti O3:Eu3+ system is stronger than the single-doped Eu3+. It shows that among the sample Mg Ti O3:Eu3+, Gd3+ there’s energy transmission between Eu3+ and Gd3+, and the luminescence property of Eu3+ in Mg Ti O3 have been promoted.The Eu3+ doped Na2La2Ti3O10 red luminescence materials are prepared by sol-gel method, and use ethyleneglycol as stabilizer. When the annealing temperature reaches 600℃, the intermediate product cubic phase Na0.5La0.5Ti O3 appeared. The end-product tetragonal phase Na2La2Ti3O10 is formed when the annealing temperature is increased to 700℃. Through the excitation spectrum and emission spectrum of the sample Na2La2Ti3O10:Eu3+, it is found that the highest light excitation is 397 nm. Use 397 nm UV-light as excitation energy, the excitation spectrum and emission spectrum shows intense red phosphor, which is corresponds to the 5D0â†'7F2 electric dipole transmission on Eu3+. By calculation, the chromatic coordinate value is(0.6251,0.3744), which is very close to the NTSC standard value(0.670,0.330).By the research of the Eu3+ doped with Na YTi O4 red luminescence materials, the XRD result shows that the pure tetragonal phase phosphor Na YTi O4:Eu3+ is appeared after 2h calcination with the temperature 800℃. Through the analysis of excitation spectrum and emission spectrum of the sample Na YTi O4:Eu3+, it is found that the highest light excitation is 397 nm. Use 397 nm UV-light as excitation energy, the excitation spectrum and emission spectrum shows intense red red luminescence material, which is correspond to the 5D0â†'7F2 electric dipole transmission on Eu3+.Zn Ti O3, Zn2 Ti O4, Mg Ti O3, Na2La2Ti3O10, Na YTi O4 are chosen as matrix materials, and the most common Eu3+are chosen as an activator, we prepare the titanate red luminescent material with the good light performance through the simple and easily operation of sol-gel method. It provides information for enriching the fields of rare-earth luminescent materials and improving the application scopes of titanate.