Research On Rare Earth Conversion Luminescent Material Properties

The rare earth doped up-conversion luminescence materials are used widely inlaser anti-counterfeiting, three-dimensional display, bioluminescence imaging, immune,DNA testing and other fields. Nowadays, the research on foundation theories, newpreparation methods and new matrix materials has become the hotspots. In this paper,we studied the luminescence of the rare earth doped TiO2up-conversion samplessynthesized by sol-gel method.The research is described in detail as follows:(1)Er3+and Er3+/Yb3+co-doped TiO2samples were synthsized by sol-gel method.The up-conversion luminescence of the samples was investigated using980nm laser. Itwas found that, the Er3+and Yb3+doping concentration has a great influence on theluminous efficiency. The up-conversion luminescence intensity increases with the rareearth concentration. When the doped concentration of Er3+and Yb3+is1mol%and10mol%respectively, the TiO2shows the highest conversion luminous efficiency. Whenincreases further the concentration of rare earth, the luminous intensity decreases.(2)We synthesized the TiO2nano-crystals by using oleic acid as surfactant. Theresults indicate that the amount of oleic acid has influence on the surface topographyand up-conversion luminous efficiency. With the oleic acid increasing, thenanoparticle’s surface topography changes gradually from aggregation to smallparticles，but the luminous intensity decreases.(3)The ignition temperature of high power irradiation laser is higher than the ratedtemperature of the muffle furnace. The TiO2phosphors were synthesized using thehigh-powered laser to burn dry gel. It was found that, the phase structure of TiO2ismixture of anatase and rutile when the current of LD is2.0A. The phase structure isrutile when the current is5.0A. We found that the particles aggregate with the driving current of laser increasing. It was found that, the luminous intensity increased firstly andthen decreased with power current increasing. The highest luminous intensity is gotwhen the driving current is3.0A.