| Upconversion luminescence materials about rare earth ions doped glass have showed great potential applications such as in infrared detection, three-dimensional display, short wavelength laser, color and white light simulations. It is popular in high upconversion luminescence efficiency with the field of rare earth doped materials. At present, the main method of increasing the efficiency of upconversion luminescence is to choose a kind of substrate material which has lower phonon energy or co-doped with appropriate sensitizer rare earth ions. The way to improve the mechanical strength is usually carbide nano-crystals in the glass, that is to say, to prepare glass ceramic. Oxyfluoride glass-ceramic doped with rare earth ions combine with the advantages of oxide glass and fluoride glass. It not only has high upconversion luminescence efficiency, but also has good mechanical strength. Therefore, transparent oxyfluoride glass-ceramic with rare earth ions doped has broad development prospects in widely used such as long distance optical communication, transfer laser and data storage.This essay introduces the preparation methods and performance characterization about the CaxPb(1-x)F2oxyfluoride glass and glass-ceramic. We choose Er3+ions as activator, improving the luminescence efficiency by doping sensibilizer ions, noble metal ions and double microcrystalline eutectoid respectively.In the research of the upconversion luminescence properties about Er3+/Yb3+ions co-doping CaxPb(1-x)F2glass ceramic, the sensitizer Yb3+ion concentration play an important role on the influence of upconversion luminescence. In the test, the enhancement of the upconversion luminescence has been found through co-doped with the Er3+ions and Yb3+ions. The best transformation glowing heat treatment conditions has achieved by adjusting the sensitizer Yb3+ions concentration. This essay is based on the experimental analysis and clarifies the energy transfer mechanism between different rare earth ions. It also studied the luminescence properties of glass ceramic and explains the transformation on the luminescence enhancement.At the same time, the experiment further discusses the change of performance of upconversion luminescence by two kinds of microcrystalline formed together in the same glass. The upconversion luminescence have different trend in glass ceramic by adjusting the doping ratio of two kinds of nano-crystals. It provides the basis about further implement the conversion in the light color. In the research of Er3+/Yb3+ions co-doping CaPb(1-x)F2glass ceramic, the CaxPb(1-X)F2glass ceramic have stronger intensity than traditional CaF2glass ceramic and PbF2glass ceramic, and with the content of the CaF2:PbF2tend to be equal, the emission intensity getting increased. This kind of material is expected to be used as a color adjustable visible laser material or display material; it may also provide a new direction used for white LED with microcrystalline glass simulation.Another method which could enhance the efficiency of upconversion luminescence is to add the precious metal ions Ag+ions. The Ag+ions in the glass-ceramic could turn to the formation of silver nanoparticles, and then have some influence of the upconversion luminescence. Research shows that:with the heat treatment process in Ag+ions doped glass, Ag+ions gradually formed as silver nano-particles, then the upconversion luminescence increased in glass ceramic. It believed that the intensity of upconversion luminescence is mainly due to the surface plasmon resonance absorption of silver nano-particles. |
PDF Full Text Request