| Plasma Display technology has been developed rapidly in recent ten years. Occupancy rate of Color PDP has reached more than50%until2010. Rare-earth-doped phosphate green fluorescent powder, which acts as one of the three primary colors, has attracted concerns increasingly because of its thermal stability and good maintenance rate under vacuum ultraviolet radiation, and its practicability in the environment of high intensity quantum excitation. Phosphors fabricated by traditional solid-state reaction method have large particle size, and must be ball-milled before use. However, luminescence intensity of the powder decreases after ball-milling, and the phosphors produce diffuse reflection to ultra-violet ray. and reduce luminous flux obviously. At the same time, some wet chemical methods can not be put into industrial production. So. fabrication of phosphate ceramics shows its values, because ceramics can be produced in large scale, and the luminescence intensity and imaging effects of ceramics is more ideal compared with phosphor products.In this thesis, LaPO4:Ce3-, Tb3-(LAP) phosphors were prepared by high temperature solid state reaction method, the effects of calcination temperature, flux, Tb3+concentration, application amount of (NH.4)2HPO4, and the ratio of Ce3+and Tb3+on the phase structure and luminescent properties of phosphors were investigated. LaPO4:Ce3+, Tb3-ceramics have also been fabricated with the prepared LaPO4:Ce3+Tb3+fluorescent powders as raw materials, effects of sintering temperatures and holding time on the microstructure and luminescence properties of the ceramics was also studied. |
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