| Eu2+activated barium magnesium he xa-alum in ate phosphor BaMgAlioOi7:Eu2+is an efficient blue phosphor for fluorescent lamps, Hg-free lamps and plasma panels (PDPs) because of its high luminance efficient and good color purity under ultraviolet (UV) and vacuum ultraviolet (VUV) excitation. However, the high temperature of BaMgAlioOi7:Eu2+conventional synthesis and it undergoes degradation of luminance efficiency during the manufacturing and operation process of lamps and PDPs.The conventional solid-state re at ion are wildely used in industrial production, but the synthesis temperature up to 1550°C。As solid-state reation, the precipitation method is widely used in industrial production. In this presentation, When used NH3·H2O and NH4HCO3 as multifold precipitsnt BaMgAlioOi7:Eu2+blue phosphor was prepared by precipitation method, the synthesis temperature was 250°C lower than that of the conventional solid state method , In addition, the phosphor exhibited stronger emission intensity and better thermal stability than that prepared by solid state method. Series of phosphors Bai.MgAlioOi7:Eu2+x were synthesized by precipitation method, and their photo luminescence under UV excitation were innnvestigated, the results indicated that its optimum emission inensity at x=0.1.During the lamps or PDPs manufacturing process, the phosphors suffer temperature of about 600°C in air. The baking process leads to thermal degradation such as luminescent decrease and color shift. This process is a critical problem that affects the luminance of the lamps and PDPs. Thermal degradation of BaMgAlioOi7:Eu2+result from Eu2+was osidized to Eu3+ or the Eu2+migration and aggregation. Doping other ions could impoved its thermal stability. In this paper, BaMgAlioOi7:Eu2+blue phosphor doped with S2-was synthesized by precipitation method. The resuls showed the phosphor exhibited stronger emission intensity and better thermal stability than that phosphor without be doped S2-. |
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