Sol - Gel Method Prepared Rare Earth Doped Titania Matrix Nano-luminescent Materials

Using TiO₂ as matrix, rare earth(Eu, Dy, Tb)single doped and co-doped xerogels luminescence material and luminescence films were prepared by sol-gel progress, The modern analysis techniques such as XRD, AFM, PLE and PLspectra were used to measure the property of the luminescence material. The factors influence the luminescence property and the luminescence mechanisms of the material were studieed to look for new path to prepare utility, inexpensive fluorescence material with high efficiency.1. Eu³⁺:TiO₂-Al₂O₃ nanopowder were succeeded prepared by the sol-gel method, Average dimension and structure of whitch annealled at different temperature were studied by the X crystallogram, the influnence of Eu³⁺ concentraion, annealing temperature, annealing times, different material and formulation for the Eu³⁺:TiO₂-Al₂O₃ nanopowder's PLE spectra were studied, the results show single strongest red photoluminescence (PL) signal associated with the ⁵D₀â†'⁷F₂ transition of the electronic structure of Eu³⁺, when 468nm wavelength is used as the photoexcitation line . The PL emission first enhance and then decress along with an increase in temperature and Eu³⁺ concentraion, 700℃is the suitable annealed temperature, and 0.8% is the suitable concentration.Al³⁺-doped TiO₂:Eu³⁺ nanopowder can improve The red light strength of Eu³⁺, And when Eu-doped TiO₂ nanopowder were annled at 950℃the results indicatethat the emission band consists of two peaks located at 442nm and 464nm, respectively. The two peaks are originated from the transition 4fâ†'5d of Eu²⁺ ions.2. The Eu,Dy and Eu,Tb co-doped in TiO₂-Al₂O₃ were prepared. We find that the emission intensity of Eu²⁺ in the sample co-doped with Eu and Dy is higher than that of the sample single doped with Eu.The enhancement of the Eu²⁺ emission is due to the energy transfer from Dy³⁺ to Eu²⁺,and Tb³⁺ to Eu²⁺, and suitable concentration of Dy is 0.2% and Tb is 0.3%.3. Smooth Eu doped TiO₂ luminescence films were prepared by the sol-gel method, the Eu³⁺:TiO₂-Al₂O₃ films surface were tokened by AFM , the influnence of prepared condition for the Eu³⁺:TiO₂-Al₂O₃ films PLE spectra were studied, the results show that emission intensity increased with the increasing of the layers from 13 layers to 18 layers and fluorescence puench happened at 19 layers. The luminscence intensity become stronger first and then decreased with the increasing of the annealing temperature and the Eu concentration, the suitable Eu concentration is 1.0%. and 800℃is the suitable annealed temperature.4. Eu,Tb co-doping prepared single substrate rare earth codoped TiO₂ matrix tricolor luminescence film. We find that the emission intensity of Eu²⁺ in the sample co-doped with Eu and Tb is higher than that of the sample single doped with Eu.It was discovered that Eu³⁺and Eu²⁺ existed in the sample annealed at 950℃.